KTR18EZPJ621 Equivalent & Substitute Parts

Part Overview

The KTR18EZPJ621 is a 620 Ohm ±5% 0.25W thick film chip resistor in 1206 (3216 Metric) package manufactured by Rohm Semiconductor. This automotive-grade component features AEC-Q200 qualification and high voltage capability, operating across -55°C to 155°C. The part is currently active in production with 1045 units in stock.

Substitute parts become necessary when the primary part reaches end-of-life status, inventory constraints occur, or design requirements shift toward improved tolerance specifications or enhanced performance characteristics. The KTR18EZPJ621 maintains compatibility with multiple equivalent components across different manufacturers while preserving core electrical and mechanical specifications.

Key Parameters

Parameter	Value
Resistance	620 Ohms
Tolerance	±5%
Power Rating	0.25W (1/4W)
Package	1206 (3216 Metric)
Composition	Thick Film
Temperature Coefficient	±200ppm/°C
Operating Temperature Range	-55°C to 155°C
Automotive Rating	AEC-Q200
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	MSL 1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the KTR18EZPJ621 is determined by the following mandatory parameters:

Core Electrical Parameters:

Resistance value: 620 Ohms (exact match required)
Tolerance: ±5% or tighter (±1% acceptable as upgrade)
Power rating: 0.25W minimum (0.5W acceptable as upgrade)
Temperature coefficient: ±200ppm/°C or better

Mechanical Parameters:

Package: 1206 (3216 Metric) form factor
Composition: Thick film construction
Termination count: 2 terminations

Compliance & Environmental:

RoHS3 compliance required
MSL 1 rating required
Operating temperature range: -55°C to 155°C minimum

Automotive Qualification:

AEC-Q200 certification preferred for direct substitution
Non-automotive variants acceptable for non-critical applications

Parts are categorized as direct substitutes when all parameters match exactly. Upgrade substitutes offer improved tolerance (±1% vs ±5%) or higher power ratings (0.5W vs 0.25W) while maintaining all other specifications. Similar variants include parts with different power ratings or series designations but identical core electrical characteristics.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Package	AEC-Q200	Product Status	Inventory
KTR18EZPJ621	Rohm Semiconductor	620Ω	±5%	0.25	±200	1206	Yes	Active	1045
KTR18EZPF6200	Rohm Semiconductor	620Ω	±1%	0.25	±100	1206	Yes	Active	1778
ESR18EZPJ621	Rohm Semiconductor	620Ω	±5%	0.5	±200	1206	Yes	Active	5796
MCR18ERTJ621	Rohm Semiconductor	620Ω	±5%	0.25	±200	1206	No	Discontinued	954
CRCW1206620RJNEA	Vishay Dale	620Ω	±5%	0.25	±200	1206	Yes	Active	15480
ERJ-8GEYJ621V	Panasonic Electronic Components	620Ω	±5%	0.25	±200	1206	Yes	Not For New Designs	74201
RMCF1206JT620R	Stackpole Electronics Inc	620Ω	±5%	0.25	±200	1206	Yes	Active	126600
CR1206-FX-6200ELF	Bourns Inc.	620Ω	±1%	0.25	±100	1206	No	Active	20556
ERJ-8ENF6200V	Panasonic Electronic Components	620Ω	±1%	0.25	±100	1206	Yes	Not For New Designs	39384
RC1206FR-07620RL	YAGEO	620Ω	±1%	0.25	±100	1206	No	Active	132517
RC1206JR-07620RL	YAGEO	620Ω	±5%	0.25	±100	1206	No	Active	620087

Engineering Selection Recommendations

Direct Substitutes (Identical Specifications):

CRCW1206620RJNEA (Vishay Dale) and RMCF1206JT620R (Stackpole Electronics Inc) are primary direct substitutes. Both maintain 620Ω ±5% tolerance, 0.25W power rating, AEC-Q200 automotive qualification, and identical operating temperature range. RMCF1206JT620R offers significantly higher inventory availability (126,600 units) compared to the original part. CRCW1206620RJNEA provides 15,480 units in stock with equivalent performance characteristics.

Upgrade Substitutes (Improved Tolerance):

KTR18EZPF6200 (Rohm Semiconductor) and RC1206FR-07620RL (YAGEO) upgrade the tolerance specification to ±1% while maintaining all other parameters. KTR18EZPF6200 preserves the original manufacturer and AEC-Q200 rating with 1,778 units available. RC1206FR-07620RL offers 132,517 units in stock but lacks AEC-Q200 certification. Both feature improved temperature coefficient (±100ppm/°C vs ±200ppm/°C).

Higher Power Rating Alternative:

ESR18EZPJ621 (Rohm Semiconductor) doubles the power rating to 0.5W while maintaining all other specifications including ±5% tolerance and AEC-Q200 qualification. This variant suits applications requiring enhanced thermal margin with 5,796 units available.

Discontinued/Legacy Parts:

MCR18ERTJ621 (Rohm Semiconductor) and ERJ-8GEYJ621V (Panasonic) are marked as discontinued or not for new designs. While inventory remains available, these parts should not be selected for new product development.

Non-Automotive Alternatives:

CR1206-FX-6200ELF (Bourns Inc.) and RC1206JR-07620RL (YAGEO) lack AEC-Q200 certification but maintain all electrical specifications. These are suitable for non-automotive applications where automotive qualification is not required. RC1206JR-07620RL offers the largest inventory (620,087 units) among all alternatives.

Frequently Asked Questions (FAQ)

Q: Can I substitute KTR18EZPJ621 with a ±1% tolerance part?

A: Yes. Parts with ±1% tolerance (KTR18EZPF6200, RC1206FR-07620RL, CR1206-FX-6200ELF, ERJ-8ENF6200V) are direct electrical upgrades. The tighter tolerance provides improved accuracy without affecting mechanical compatibility or thermal performance. Verify that your circuit design does not depend on the original ±5% tolerance specification.

Q: Are non-AEC-Q200 parts acceptable substitutes?

A: Non-AEC-Q200 parts (CR1206-FX-6200ELF, RC1206FR-07620RL, RC1206JR-07620RL) are electrically and mechanically compatible but lack automotive qualification. Use these only in applications where automotive-grade reliability is not required. For automotive or safety-critical applications, maintain AEC-Q200 certification.

Q: What is the difference between 0.25W and 0.5W power ratings?

A: The 0.5W variant (ESR18EZPJ621) dissipates twice the power without exceeding temperature limits. Select 0.5W only if your circuit requires this additional thermal capacity. The 0.25W rating is sufficient for most standard applications. Both maintain identical resistance, tolerance, and package specifications.

Q: Can I use parts from different manufacturers interchangeably?

A: Yes, provided all electrical parameters (resistance, tolerance, power rating, temperature coefficient) and mechanical specifications (package, dimensions, termination count) match. The 1206 package is standardized across manufacturers. Verify RoHS and MSL compliance for your supply chain requirements.

Q: Which substitute offers the best inventory availability?

A: RMCF1206JT620R (Stackpole Electronics Inc) provides 126,600 units in stock, the highest among all alternatives. RC1206JR-07620RL (YAGEO) offers 620,087 units but lacks AEC-Q200 certification. For automotive applications requiring AEC-Q200, RMCF1206JT620R is the optimal choice for supply continuity.

Q: Does package size vary between substitutes?

A: All listed substitutes use the 1206 (3216 Metric) package with standardized 0.126" × 0.063" (3.20mm × 1.60mm) footprint. Height specifications vary slightly (0.024" to 0.030" seated height), but these differences are within standard PCB assembly tolerances and do not affect interchangeability.

Q: What is the temperature coefficient significance?

A: The original KTR18EZPJ621 has ±200ppm/°C temperature coefficient. Upgrade substitutes offer ±100ppm/°C, meaning resistance changes half as much across the operating temperature range. This improves circuit stability in temperature-sensitive applications. Standard applications tolerate both specifications equally.

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