AF1206JR-0718RL Equivalent & Substitute Parts

Part Overview

The AF1206JR-0718RL is an 18 Ohm ±5% 0.25W thick film chip resistor in 1206 (3216 Metric) package manufactured by YAGEO. This component is rated for automotive applications under AEC-Q200 and features anti-sulfur construction. The part is currently active in production with 1,062 units in stock.

Substitute parts are necessary when the primary part becomes unavailable, when design requirements demand tighter tolerance specifications, or when alternative manufacturers' components are preferred for supply chain diversification and cost optimization.

Key Parameters

Parameter	Value
Resistance	18 Ohms
Tolerance	±5%
Power Rating	0.25W (1/4W)
Package	1206 (3216 Metric)
Composition	Thick Film
Temperature Coefficient	±100ppm/°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 AF1206JR-0718RL is determined by the following mandatory parameters:

Resistance Value: Must be 18 Ohms
Tolerance: ±5% or tighter (±1% acceptable)
Power Rating: 0.25W minimum (0.75W acceptable with derating consideration)
Package: 1206 (3216 Metric) only
Composition: Thick Film
Temperature Coefficient: ±100ppm/°C
Operating Temperature: -55°C to 155°C minimum
Compliance: ROHS3 and MSL 1 required

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (±5% Tolerance, AEC-Q200)

AC1206JR-0718RL (YAGEO, Moisture Resistant)
RC1206JR-0718RL (YAGEO, Moisture Resistant)
RC3216J180CS (Samsung Electro-Mechanics, Moisture Resistant)

Category B - Tighter Tolerance Alternatives (±1% Tolerance)

AC1206FR-0718RL (YAGEO, AEC-Q200, Moisture Resistant)
RC1206FR-0718RL (YAGEO, Moisture Resistant)
CR1206-FX-18R0ELF (Bourns Inc., Moisture Resistant)
CRCW120618R0FKEA (Vishay Dale, AEC-Q200)
CRCW120618R0FKEAHP (Vishay Dale, AEC-Q200, 0.75W)
ERJ-8ENF18R0V (Panasonic, AEC-Q200, Not For New Designs)
RMCF1206FT18R0 (Stackpole Electronics, AEC-Q200)

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power	Package	Temp Coeff	Operating Temp	AEC-Q200	RoHS3	MSL	Status
AF1206JR-0718RL	YAGEO	18Ω	±5%	0.25W	1206	±100ppm/°C	-55 to 155°C	Yes	Yes	1	Active
AC1206JR-0718RL	YAGEO	18Ω	±5%	0.25W	1206	±100ppm/°C	-55 to 155°C	Yes	Yes	1	Active
AC1206FR-0718RL	YAGEO	18Ω	±1%	0.25W	1206	±100ppm/°C	-55 to 155°C	Yes	Yes	1	Active
RC1206JR-0718RL	YAGEO	18Ω	±5%	0.25W	1206	±100ppm/°C	-55 to 155°C	No	Yes	1	Active
RC1206FR-0718RL	YAGEO	18Ω	±1%	0.25W	1206	±100ppm/°C	-55 to 155°C	No	Yes	1	Active
CR1206-FX-18R0ELF	Bourns Inc.	18Ω	±1%	0.25W	1206	±100ppm/°C	-55 to 155°C	No	Yes	1	Active
CRCW120618R0FKEA	Vishay Dale	18Ω	±1%	0.25W	1206	±100ppm/°C	-55 to 155°C	Yes	Yes	1	Active
CRCW120618R0FKEAHP	Vishay Dale	18Ω	±1%	0.75W	1206	±100ppm/°C	-55 to 155°C	Yes	Yes	1	Active
ERJ-8ENF18R0V	Panasonic	18Ω	±1%	0.25W	1206	±100ppm/°C	-55 to 155°C	Yes	Yes	1	Not For New Designs
RC3216J180CS	Samsung Electro-Mechanics	18Ω	±5%	0.25W	1206	±100ppm/°C	-55 to 155°C	No	Yes	1	Active
RMCF1206FT18R0	Stackpole Electronics	18Ω	±1%	0.25W	1206	±100ppm/°C	-55 to 155°C	Yes	Yes	1	Active

Engineering Selection Recommendations

For AEC-Q200 Automotive Applications with ±5% Tolerance: AC1206JR-0718RL and RC1206JR-0718RL are direct functional equivalents. Both maintain AEC-Q200 certification and identical electrical specifications. AC1206JR-0718RL offers higher inventory availability (13,933 units) compared to RC1206JR-0718RL (46,927 units). RC3216J180CS is functionally compatible but lacks AEC-Q200 rating.

For AEC-Q200 Automotive Applications with ±1% Tolerance: AC1206FR-0718RL, CRCW120618R0FKEA, and RMCF1206FT18R0 maintain full AEC-Q200 compliance with tighter tolerance. CRCW120618R0FKEAHP provides increased power handling (0.75W) while retaining AEC-Q200 rating and ±1% tolerance, suitable for applications requiring thermal margin.

For Non-Automotive or General-Purpose Applications: RC1206FR-0718RL and CR1206-FX-18R0ELF are suitable alternatives without AEC-Q200 requirement. Both offer ±1% tolerance and ROHS3 compliance.

Obsolescence Consideration: ERJ-8ENF18R0V is marked "Not For New Designs" and should be avoided for new product development despite maintaining AEC-Q200 certification and active inventory.

Frequently Asked Questions (FAQ)

Q: Can I substitute AF1206JR-0718RL with a ±1% tolerance part? A: Yes. Parts with ±1% tolerance (AC1206FR-0718RL, RC1206FR-0718RL, CRCW120618R0FKEA, RMCF1206FT18R0) are direct substitutes. Tighter tolerance provides improved circuit accuracy without functional incompatibility.

Q: Is AEC-Q200 certification required for all substitutes? A: No. AEC-Q200 is required only for automotive applications. For general-purpose circuits, non-AEC-Q200 parts (RC1206JR-0718RL, RC1206FR-0718RL, CR1206-FX-18R0ELF) are acceptable substitutes.

Q: Can I use CRCW120618R0FKEAHP (0.75W) instead of the 0.25W original? A: Yes. Higher power rating is a safe substitution. The 0.75W part provides additional thermal margin and is electrically compatible. No circuit modification is required.

Q: Are there package dimension differences between substitutes? A: All substitutes use 1206 (3216 Metric) package. Minor dimensional variations exist (height ranges 0.60mm to 0.75mm, length ranges 3.10mm to 3.20mm), but these fall within standard PCB footprint tolerances and do not affect mechanical compatibility.

Q: Why is ERJ-8ENF18R0V marked "Not For New Designs"? A: This designation indicates the manufacturer has discontinued active development for this part. While currently in stock and functionally equivalent, it should not be selected for new product designs to avoid future obsolescence risk.

Q: What is the difference between YAGEO AF and AC series? A: AF series includes anti-sulfur construction; AC series includes moisture-resistant construction. Both are functionally equivalent for the 18 Ohm ±5% specification. AC series offers higher inventory availability.

Q: Can I mix different manufacturers' parts in the same circuit? A: Yes. All listed substitutes meet identical electrical specifications (18Ω ±5% or ±1%, 0.25W, -55°C to 155°C). Mixing manufacturers is acceptable from an electrical standpoint. For high-reliability applications, maintain single-source procurement when possible.

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