RN732BTTD4120B25 Equivalent & Substitute Parts

Part Overview

The RN732BTTD4120B25 is a 412 Ohms ±0.1% 0.125W (1/8W) Chip Resistor in 1206 (3216 Metric) package manufactured by KOA Speer Electronics, Inc. This thin film, moisture-resistant component operates across -55°C to 155°C with a temperature coefficient of ±25ppm/°C. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value
Resistance	412 Ohms
Tolerance	±0.1%
Power Rating	0.125W (1/8W)
Composition	Thin Film
Package / Case	1206 (3216 Metric)
Temperature Coefficient	±25ppm/°C
Operating Temperature Range	-55°C ~ 155°C
Moisture Sensitivity Level	1 (Unlimited)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the RN732BTTD4120B25 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Resistance value: 412 Ohms
Tolerance: ±0.1%
Package: 1206 (3216 Metric)
Composition: Thin Film
Temperature Coefficient: ±25ppm/°C
Operating Temperature Range: -55°C ~ 155°C minimum
Moisture Sensitivity Level: 1 (Unlimited)

Power Rating Consideration: The original part is rated at 0.125W (1/8W). Direct equivalents maintain this power rating. Substitute parts with higher power ratings (0.25W, 1/4W, or 1W) are electrically compatible and mechanically interchangeable within the 1206 package footprint, providing enhanced thermal margin in the same physical envelope.

Compliance Alignment: All substitute parts listed maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with modern manufacturing and storage requirements.

Parameter Comparison

Manufacturer	Part Number	Resistance	Tolerance	Power (W)	Composition	Temp Coeff (ppm/°C)	Temp Range (°C)	Package	Status	RoHS
KOA Speer Electronics	RN732BTTD4120B25	412 Ω	±0.1%	0.125	Thin Film	±25	-55 ~ 155	1206	Obsolete	ROHS3
KOA Speer Electronics	RN73R2BTTD4120B25	412 Ω	±0.1%	0.25	Thin Film	±25	-55 ~ 155	1206	Active	ROHS3
TE Connectivity Passive Product	CPF1206B412RE1	412 Ω	±0.1%	0.125	Thin Film	±25	-55 ~ 155	1206	Active	ROHS3
Bourns Inc.	CRT1206-BY-4120ELF	412 Ω	±0.1%	0.25	Thin Film	±25	-55 ~ 155	1206	Active	ROHS3
YAGEO	RT1206BRD07412RL	412 Ω	±0.1%	0.25	Thin Film	±25	-55 ~ 155	1206	Active	ROHS3
Vishay Dale	TNPW1206412RBETY	412 Ω	±0.1%	0.25	Thin Film	±25	-55 ~ 125	1206	Active	Non-compliant
YAGEO	AT1206BRD07412RL	412 Ω	±0.1%	0.25	Thin Film	±25	-55 ~ 155	1206	Active	ROHS3
Panasonic Electronic Components	ERA-8AEB4120V	412 Ω	±0.1%	0.25	Thin Film	±25	-55 ~ 155	1206	Active	ROHS3
Susumu	HRG3216P-4120-B-T1	412 Ω	±0.1%	1.0	Thin Film	±25	-55 ~ 155	1206	Active	ROHS3
Susumu	HRG3216P-4120-B-T5	412 Ω	±0.1%	1.0	Thin Film	±25	-55 ~ 155	1206	Active	ROHS3
Vishay Beyschlag/Draloric/BC Components	MCA12060D4120BP100	412 Ω	±0.1%	0.25	Thin Film	±25	-55 ~ 125	1206	Active	ROHS3

Engineering Selection Recommendations

Direct Equivalent (Same Power Rating): CPF1206B412RE1 from TE Connectivity Passive Product is the direct equivalent, maintaining the 0.125W power rating while offering active product status and ROHS3 compliance. This part provides identical electrical performance with current manufacturing support.

Primary Substitutes (Higher Power Rating, Same Package): Parts with 0.25W (1/4W) power ratings—RN73R2BTTD4120B25, CRT1206-BY-4120ELF, RT1206BRD07412RL, AT1206BRD07412RL, ERA-8AEB4120V, and MCA12060D4120BP100—are mechanically and electrically interchangeable within the 1206 footprint. These provide enhanced thermal performance in the same physical envelope. All maintain ±0.1% tolerance, ±25ppm/°C temperature coefficient, and -55°C to 155°C operating range (except TNPW1206412RBETY and MCA12060D4120BP100, which limit to -55°C to 125°C).

Enhanced Performance Substitutes (1W Power Rating): HRG3216P-4120-B-T1 and HRG3216P-4120-B-T5 from Susumu provide 1W power rating in the same 1206 package, offering maximum thermal margin. Both maintain full electrical specifications and ROHS3 compliance with -55°C to 155°C operating range.

Compliance Considerations: TNPW1206412RBETY from Vishay Dale is RoHS non-compliant and REACH-affected, limiting its use in applications requiring modern regulatory compliance. This part should be avoided for new designs and applications subject to RoHS3 requirements.

Automotive Applications: For automotive applications requiring AEC-Q200 qualification, select RN73R2BTTD4120B25, AT1206BRD07412RL, ERA-8AEB4120V, HRG3216P-4120-B-T1, or HRG3216P-4120-B-T5.

Frequently Asked Questions (FAQ)

Q: Can I substitute the RN732BTTD4120B25 with a higher power-rated part in the same 1206 package?

A: Yes. Parts rated at 0.25W (1/4W) or 1W are mechanically and electrically interchangeable within the 1206 (3216 Metric) footprint. Higher power ratings provide additional thermal margin without affecting circuit performance, as the resistance value, tolerance, and temperature coefficient remain identical.

Q: What is the difference between direct equivalents and substitutes?

A: Direct equivalents maintain the same power rating (0.125W). Substitutes with higher power ratings (0.25W or 1W) are electrically compatible but provide enhanced thermal performance. All listed parts share the same 412 Ohm resistance, ±0.1% tolerance, ±25ppm/°C temperature coefficient, and 1206 package.

Q: Are all substitute parts ROHS3 compliant?

A: No. TNPW1206412RBETY from Vishay Dale is RoHS non-compliant. All other listed substitutes are ROHS3 compliant. For applications requiring RoHS3 compliance, exclude TNPW1206412RBETY.

Q: Which substitute offers the best thermal performance?

A: HRG3216P-4120-B-T1 and HRG3216P-4120-B-T5 from Susumu provide 1W power rating, the highest thermal capacity among listed substitutes. Both maintain full electrical specifications and ROHS3 compliance.

Q: Can I use TNPW1206412RBETY as a substitute?

A: TNPW1206412RBETY is electrically compatible but has two limitations: it is RoHS non-compliant and operates only to -55°C to 125°C (versus -55°C to 155°C for the original part). Use only in applications where RoHS compliance is not required and the reduced upper temperature limit is acceptable.

Q: What is the operating temperature difference between substitutes?

A: Most substitutes operate across -55°C to 155°C, matching the original part. TNPW1206412RBETY and MCA12060D4120BP100 limit operation to -55°C to 125°C. Verify application temperature requirements before selection.

Q: Are there automotive-qualified alternatives?

A: Yes. RN73R2BTTD4120B25, AT1206BRD07412RL, ERA-8AEB4120V, HRG3216P-4120-B-T1, and HRG3216P-4120-B-T5 carry AEC-Q200 automotive qualification. Select these for automotive applications.

Q: What is the Moisture Sensitivity Level (MSL) for all parts?

A: All listed parts maintain MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

Q: Can I mix different substitute manufacturers in the same circuit board?

A: Yes. All listed substitutes share identical electrical specifications (412 Ω, ±0.1%, ±25ppm/°C) and mechanical compatibility (1206 package). Different manufacturers can be used interchangeably within the same design.

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