4700 ohm Fixed Resistors 455

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Part	Manufacturer	Resistor Type	Mounting Type	Resistance	Rated Power Dissipation (P)	Maximum Operating Temperature	Tolerance	Rated Temperature	Technology	Shape (Package)	Construction	Packing Method	Size Code	No. of Terminals	Package Style (Meter)	Terminal Shape	Sub-Category	Dimensions	Minimum Operating Temperature	Temperature Coef (ppm/Cel)	Terminal Finish	Height (Package)	Operating Voltage	Additional Features	Length (Package)	JESD-609 Code	Series	Reference Standard	Width (Package)
RC0603FR-074K7L	Yageo	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.1 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM		Rectangular	TR, PAPER, 7 INCH	0603	2	SMT	WRAPAROUND			-55 Cel	100	Matte Tin (Sn) - with Nickel (Ni) barrier	.45 mm	75 V	LASER TRIMMABLE	1.6 mm	e3			.8 mm
CRCW04024K70FKED	Vishay Intertechnology	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.063 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM		Rectangular	TR, PAPER, 7 INCH	0402	2	SMT	WRAPAROUND			-55 Cel	100	MATTE TIN OVER NICKEL	.35 mm	50 V	LASER TRIMMABLE, RATED AC VOLTAGE (V): 50	1 mm	e3		AEC-Q200	.5 mm
RC0805FR-074K7L	Yageo	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.125 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM		Rectangular	TR, PAPER, 7 INCH	0805	2	SMT	WRAPAROUND			-55 Cel	100	Matte Tin (Sn) - with Nickel (Ni) barrier	.5 mm	150 V	LASER TRIMMABLE	2 mm	e3			1.25 mm
CRCW06034K70FKEAHP	Vishay Intertechnology	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.33 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM	RECTANGULAR PACKAGE	Rectangular	TR, PAPER, 7 INCH	0603	2	SMT	WRAPAROUND			-55 Cel	100	MATTE TIN OVER NICKEL	.45 mm	75 V	RATED AC VOLTAGE: 75V	1.6 mm	e3		AEC-Q200	.85 mm
ERJ3EKF4701V	Panasonic	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.1 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM	RECTANGULAR PACKAGE	Rectangular	TR, PUNCHED, 7 INCH	0603	2	SMT	WRAPAROUND			-55 Cel	100	MATTE TIN OVER NICKEL	.45 mm	75 V	PRECISION, STANDARD: IEC60115-8	1.6 mm	e3		AEC-Q200	.8 mm
RC0402FR-074K7L	Yageo	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.0625 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM		Rectangular	TR, PAPER, 7 INCH	0402	2	SMT	WRAPAROUND			-55 Cel	100	Matte Tin (Sn) - with Nickel (Ni) barrier	.35 mm	50 V	LASER TRIMMABLE	1 mm	e3			.5 mm
CRCW04024K70FKEDHP	Vishay Intertechnology	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.2 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM	RECTANGULAR PACKAGE	Rectangular	TR, PAPER, 7 INCH	0402	2	SMT	WRAPAROUND			-55 Cel	100	MATTE TIN OVER NICKEL	.3 mm	50 V	RATED AC VOLTAGE: 50V	1 mm	e3		AEC-Q200	.5 mm
CRCW06034K70FKEA	Vishay Intertechnology	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.1 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM		Rectangular	TR, PAPER, 7 INCH	0603	2	SMT	WRAPAROUND			-55 Cel	100	MATTE TIN OVER NICKEL	.45 mm	75 V	LASER TRIMMABLE, RATED AC VOLTAGE (V): 75	1.55 mm	e3		AEC-Q200	.85 mm
RC0603FR-074K7	Yageo	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.1 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM	RECTANGULAR PACKAGE	Chip	TR, PAPER, 7 INCH	0603	2	SMT	WRAPAROUND	Fixed Resistors		-55 Cel	100	Matte Tin (Sn) - with Nickel (Ni) barrier	.45 mm	50 V	LASER TRIMMABLE	1.6 mm	e3			.8 mm
RC0603FR074K7	Amri Enterprise	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.1 W	125 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM	RECTANGULAR PACKAGE		TR	0603	2		WRAPAROUND			-55 Cel	100			50 V
CRCW06034K70FKEAC	Vishay Intertechnology	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.1 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM		Rectangular	TR, PAPER, 7 INCH	0603	2	SMT	WRAPAROUND			-55 Cel	100	MATTE TIN OVER NICKEL	.45 mm	75 V	RATED AC COLTAGE(V): 75	1.6 mm	e3			.8 mm
CRCW04024K70FKEDC	Vishay Intertechnology	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.063 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM		Rectangular	TR, PAPER, 7 INCH	0402	2	SMT	WRAPAROUND			-55 Cel	100	MATTE TIN OVER NICKEL	.3 mm	50 V	RATED AC COLTAGE(V): 50	1 mm	e3			.5 mm
RC0603JR-074K7L	Yageo	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.1 W	155 Cel	5 %	70 Cel	METAL GLAZE/THICK FILM		Rectangular	TR, PAPER, 7 INCH	0603	2	SMT	WRAPAROUND			-55 Cel	100	Matte Tin (Sn) - with Nickel (Ni) barrier	.45 mm	75 V	LASER TRIMMABLE	1.6 mm	e3			.8 mm
ERJ2RKF4701X	Panasonic	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.1 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM	RECTANGULAR PACKAGE	Rectangular	TR, PUNCHED, 7 INCH	0402	2	SMT	WRAPAROUND			-55 Cel	100	MATTE TIN OVER NICKEL	.35 mm	50 V	PRECISION, STANDARD: IEC60115-8	1 mm	e3		AEC-Q200	.5 mm
RC1206FR-074K7L	Yageo	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.25 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM		Rectangular	TR, PAPER, 7 INCH	1206	2	SMT	WRAPAROUND			-55 Cel	100	Matte Tin (Sn) - with Nickel (Ni) barrier	.55 mm	200 V	LASER TRIMMABLE	3.1 mm	e3			1.6 mm
CRG0402F4K7	TE Connectivity	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.063 W	155 Cel	1 %	70 Cel	THICK FILM	RECTANGULAR PACKAGE	Rectangular	TR	0402	2	SMT	WRAPAROUND		1mm x .5mm x .35mm	-55 Cel	100	MATTE TIN OVER NICKEL	.35 mm	50 V	LASER TRIMMABLE	1 mm	e3			.5 mm
CRG0603F4K7	TE Connectivity	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.1 W	155 Cel	1 %	70 Cel	THICK FILM	RECTANGULAR PACKAGE	Rectangular	TR	0603	2	SMT	WRAPAROUND		1.6mm x .8mm x .45mm	-55 Cel	100	MATTE TIN OVER NICKEL	.45 mm	75 V	LASER TRIMMABLE	1.6 mm	e3			.8 mm
CRCW08054K70FKEAHP	Vishay Intertechnology	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.5 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM	RECTANGULAR PACKAGE	Rectangular	TR, PAPER, 7 INCH	0805	2	SMT	WRAPAROUND			-55 Cel	100	TIN OVER NICKEL	.5 mm	150 V	RATED AC VOLTAGE: 150V	2 mm	e3		AEC-Q200	1.25 mm
ERJ2GEJ472X	Panasonic	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.1 W	155 Cel	5 %	70 Cel	METAL GLAZE/THICK FILM	RECTANGULAR PACKAGE	Rectangular	TR, PUNCHED, 7 INCH	0402	2	SMT	WRAPAROUND			-55 Cel	200	MATTE TIN OVER NICKEL	.35 mm	50 V	IEC60115-8	1 mm	e3		AEC-Q200	.5 mm
CRCW08054K70FKEA	Vishay Intertechnology	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.125 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM		Rectangular	TR, PAPER, 7 INCH	0805	2	SMT	WRAPAROUND			-55 Cel	100	MATTE TIN OVER NICKEL	.45 mm	150 V	LASER TRIMMABLE, RATED AC VOLTAGE (V): 150	2 mm	e3		AEC-Q200	1.25 mm
CRCW08054K70FKEAC	Vishay Intertechnology	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.125 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM		Rectangular	TR, PAPER, 7 INCH	0805	2	SMT	WRAPAROUND			-55 Cel	100	MATTE TIN OVER NICKEL	.5 mm	150 V	RATED AC COLTAGE(V): 150	2 mm	e3			1.25 mm
CR0603-FX-4701ELF	Bourns	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.1 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM	RECTANGULAR PACKAGE	Rectangular	TR, Paper, 7 Inch	0603	2	SMT	WRAPAROUND			-55 Cel	100	TIN OVER NICKEL	.45 mm	75 V		1.6 mm	e3			.8 mm
RC0402JR-074K7L	Yageo	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.0625 W	155 Cel	5 %	70 Cel	METAL GLAZE/THICK FILM		Rectangular	TR, PAPER, 7 INCH	0402	2	SMT	WRAPAROUND			-55 Cel	100	Matte Tin (Sn) - with Nickel (Ni) barrier	.35 mm	50 V	LASER TRIMMABLE	1 mm	e3			.5 mm
MCT06030C4701FP500	Vishay Intertechnology	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.1 W	125 Cel	1 %	70 Cel	THIN FILM	RECTANGULAR PACKAGE	Rectangular	TR, PAPER, 7 INCH	0603	2	SMT	WRAPAROUND	FIXED RESISTOR		-55 Cel	50	MATTE TIN OVER NICKEL	.45 mm	75 V	ANTI-SULFUR, LASER TRIMMABLE, RATED AC VOLTAGE (V): 75	1.55 mm	e3		CECC40401-801	.85 mm
3-2176339-3	TE Connectivity	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.1 W		1 %		THICK FILM	RECTANGULAR PACKAGE		TR	0603	2		WRAPAROUND		1.6mm x .8mm x .45mm		100			75 V
CRCW04024K70JNEDIF	Vishay Intertechnology	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.063 W	155 Cel	5 %	70 Cel	METAL GLAZE/THICK FILM		Rectangular	TR, PAPER, 7 INCH	0402	2	SMT	WRAPAROUND			-55 Cel	200	TIN OVER NICKEL	.35 mm	50 V	RATED AC VOLTAGE (V): 50	1 mm	e3		AEC-Q200	.5 mm
RC0402FR-134K7L	Yageo	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.0625 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM		Rectangular	TR, PAPER, 13 INCH	0402	2	SMT	WRAPAROUND			-55 Cel	100	Matte Tin (Sn) - with Nickel (Ni) barrier	.35 mm	50 V	LASER TRIMMABLE	1 mm	e3			.5 mm
RC0805JR-074K7L	Yageo	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.125 W	155 Cel	5 %	70 Cel	METAL GLAZE/THICK FILM		Rectangular	TR, PAPER, 7 INCH	0805	2	SMT	WRAPAROUND			-55 Cel	100	Matte Tin (Sn) - with Nickel (Ni) barrier	.5 mm	150 V	LASER TRIMMABLE	2 mm	e3			1.25 mm
35214K7FT	TE Connectivity	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	2 W	155 Cel	1 %	70 Cel	THICK FILM	RECTANGULAR PACKAGE		TR	2512	2		WRAPAROUND		6.35mm x 3.2mm x .55mm	-55 Cel	100			250 V					AEC-Q200
CRCW08054K70FKTABC	Vishay Intertechnology	FIXED RESISTOR		4700 ohm	.125 W	155 Cel	1 %		METAL GLAZE/THICK FILM		Chip	TR, Paper, 7 Inch	0805	2	SMT		Fixed Resistors		-55 Cel	100	TIN OVER NICKEL	.45 mm	150 V		2 mm	e3	CRCW-BCE3		1.25 mm
CRCW04024K70JNEDHP	Vishay Intertechnology	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.2 W	155 Cel	5 %	70 Cel	METAL GLAZE/THICK FILM	RECTANGULAR PACKAGE	Rectangular	TR, PAPER, 7 INCH	0402	2	SMT	WRAPAROUND			-55 Cel	200	MATTE TIN OVER NICKEL	.3 mm	50 V	RATED AC VOLTAGE: 50V	1 mm	e3		AEC-Q200	.5 mm
CRGCQ0402F4K7	TE Connectivity	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.063 W	155 Cel	1 %	70 Cel	THICK FILM	RECTANGULAR PACKAGE	Rectangular	TR	0402	2	SMT	WRAPAROUND		1mm x .5mm x .35mm	-55 Cel	100		.35 mm	50 V		1 mm			AEC-Q200	.5 mm
ERJ3GEYJ472V	Panasonic	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.1 W	155 Cel	5 %	70 Cel	METAL GLAZE/THICK FILM	RECTANGULAR PACKAGE	Rectangular	TR, PUNCHED, 7 INCH	0603	2	SMT	WRAPAROUND			-55 Cel	200	MATTE TIN OVER NICKEL	.45 mm	75 V	IEC60115-8	1.6 mm	e3		AEC-Q200	.8 mm
CRCW12064K70FKEAHP	Vishay Intertechnology	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.75 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM	RECTANGULAR PACKAGE	Rectangular	TR, PAPER, 7 INCH	1206	2	SMT	WRAPAROUND			-55 Cel	100	MATTE TIN OVER NICKEL	.5 mm	200 V	RATED AC VOLTAGE: 200V	3.1 mm	e3		AEC-Q200	1.6 mm
RC0201FR-074K7L	Yageo	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.05 W	125 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM		Rectangular	TR, PAPER, 7 INCH	0201	2	SMT	WRAPAROUND			-55 Cel	200	Matte Tin (Sn) - with Nickel (Ni) barrier	.23 mm	25 V	LASER TRIMMABLE	.6 mm	e3			.3 mm
CRCW12064K70FKEA	Vishay Intertechnology	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.25 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM		Rectangular	TR, PAPER, 7 INCH	1206	2	SMT	WRAPAROUND			-55 Cel	100	MATTE TIN OVER NICKEL	.55 mm	200 V	LASER TRIMMABLE, RATED AC VOLTAGE (V): 200	3.2 mm	e3		AEC-Q200	1.6 mm
CRG0805F4K7	TE Connectivity	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.125 W	155 Cel	1 %	70 Cel	THICK FILM	RECTANGULAR PACKAGE	Rectangular	TR	0805	2	SMT	WRAPAROUND		2mm x 1.25mm x .55mm	-55 Cel	100	MATTE TIN OVER NICKEL	.55 mm	150 V	LASER TRIMMABLE	2 mm	e3			1.25 mm
RC0603FR-134K7L	Yageo	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.1 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM		Rectangular	TR, PAPER, 13 INCH	0603	2	SMT	WRAPAROUND			-55 Cel	100	Matte Tin (Sn) - with Nickel (Ni) barrier	.45 mm	75 V	LASER TRIMMABLE	1.6 mm	e3			.8 mm
MCS04020C4701FE000	Vishay Intertechnology	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.063 W	125 Cel	1 %	70 Cel	THIN FILM	RECTANGULAR PACKAGE	Rectangular	TR, PAPER, 7 INCH	0402	2	SMT	WRAPAROUND	FIXED RESISTOR		-55 Cel	50	MATTE TIN OVER NICKEL	.32 mm	50 V	ANTI-SULFUR, LASER TRIMMABLE, RATED AC VOLTAGE (V): 50	1 mm	e3		CECC40401-801	.5 mm
RK73H1ETTP4701F	Koa Speer Electronics	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.1 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM	RECTANGULAR PACKAGE	Rectangular	TR, PUNCHED PAPER, 7 INCH	0402	2	SMT	WRAPAROUND			-55 Cel	100	MATTE TIN OVER NICKEL	.35 mm	75 V	PRECISION	1 mm	e3		AEC-Q200	.5 mm
CRGP0603F4K7	TE Connectivity	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.25 W	155 Cel	1 %	70 Cel	THICK FILM	RECTANGULAR PACKAGE	Rectangular	TR	0603	2	SMT	WRAPAROUND		1.6mm x .8mm x .45mm	-55 Cel	100		.45 mm	50 V		1.6 mm			AEC-Q200	.8 mm
RK73H1JTTD4701F	Koa Speer Electronics	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.1 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM	RECTANGULAR PACKAGE	Rectangular	TR, PUNCHED PAPER, 7 INCH	0603	2	SMT	WRAPAROUND			-55 Cel	100	MATTE TIN OVER NICKEL	.45 mm	75 V	PRECISION	1.6 mm	e3		AEC-Q200	.8 mm
ERJU03F4701V	Panasonic	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.1 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM		Rectangular	TR, PUNCHED, 7 INCH	0603	2	SMT	WRAPAROUND			-55 Cel	100	TIN	.45 mm	75 V	ANTI-SULFUR, IEC60115-8	1.6 mm	e3		AEC-Q200	.8 mm
AC0402FR-074K7L	Yageo	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.0625 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM		Rectangular	TR, PAPER, 7 INCH	0402	2	SMT	WRAPAROUND			-55 Cel	100	Matte Tin (Sn) - with Nickel (Ni) barrier	.32 mm	50 V	LASER TRIMMABLE	1 mm	e3		AEC-Q200	.5 mm
CRCW06034K70JNEAIF	Vishay Intertechnology	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.1 W	155 Cel	5 %	70 Cel	METAL GLAZE/THICK FILM		Rectangular	TR, PAPER, 7 INCH	0603	2	SMT	WRAPAROUND			-55 Cel	200	MATTE TIN OVER NICKEL	.45 mm	75 V	RATED AC VOLTAGE (V): 75	1.55 mm	e3		AEC-Q200	.85 mm
WR04X4701FTL	Walsin Technology	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.0625 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM		Rectangular	TR, PAPER, 7 INCH	0402	2	SMT	WRAPAROUND			-55 Cel	100	Matte Tin (Sn) - with Nickel (Ni) barrier	.35 mm	50 V	LASER TRIMMABLE; RATED AC VOLTAGE (V): 50	1 mm	e3			.5 mm
KTR03EZPF4701	ROHM	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.1 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM	RECTANGULAR PACKAGE	Rectangular	TR, PAPER, 7 INCH	0603	2	SMT	WRAPAROUND			-55 Cel	100	TIN OVER NICKEL	.45 mm	350 V		1.6 mm	e3		AEC-Q200	.8 mm
ERJ6ENF4701V	Panasonic	FIXED RESISTOR	SURFACE MOUNT	4700 ohm	.125 W	155 Cel	1 %	70 Cel	METAL GLAZE/THICK FILM	RECTANGULAR PACKAGE	Rectangular	TR, PUNCHED, 7 INCH	0805	2	SMT	WRAPAROUND			-55 Cel	100	MATTE TIN OVER NICKEL	.6 mm	150 V	PRECISION, STANDARD: IEC60115-8	2 mm	e3		AEC-Q200	1.25 mm

Fixed Resistors

Fixed resistors are passive electronic components that are used to resist the flow of electric current in a circuit. They have a fixed value of resistance, meaning their resistance cannot be adjusted once they are manufactured. They are commonly used to set the bias of transistors, control the gain of amplifiers, or limit the current flowing through an LED. Fixed resistors come in various sizes, power ratings, and tolerances.

There are two types of fixed resistors: through-hole and surface mount. Through-hole resistors have leads that are inserted into holes on the printed circuit board (PCB), while surface mount resistors have terminals that are soldered directly to the surface of the PCB. Through-hole resistors are larger and easier to work with, but surface mount resistors are smaller and more suitable for miniaturized electronic devices.

Fixed resistors can be made from a variety of materials, including carbon, metal, and wire-wound. Carbon resistors are inexpensive and widely used, but they have a lower tolerance and are more susceptible to noise than other types. Metal film resistors have a higher tolerance and better stability, making them ideal for use in precision circuits. Wire-wound resistors have a higher power rating and are used in high power applications, such as power supplies and amplifiers.