RG2012P-49R9-C-T5 Equivalent & Substitute Parts

Part Overview

The RG2012P-49R9-C-T5 is a 49.9 Ohms ±0.25% thin film chip resistor in 0805 (2012 Metric) package rated for 0.125W (1/8W) power dissipation. Manufactured by Susumu with anti-sulfur coating and automotive AEC-Q200 qualification, this component is designed for precision applications requiring high reliability in harsh environments. The part is currently obsolete, necessitating identification of equivalent and substitute components that maintain electrical and mechanical compatibility while offering active product status and improved performance characteristics.

Key Parameters

Parameter	Value
Resistance	49.9 Ohms
Tolerance	±0.25%
Power Rating	0.125W (1/8W)
Package	0805 (2012 Metric)
Composition	Thin Film
Operating Temperature Range	-55°C ~ 155°C
Temperature Coefficient	±25ppm/°C
Features	Anti-Sulfur, Automotive AEC-Q200
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the RG2012P-49R9-C-T5 is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Resistance value: 49.9 Ohms (exact match required)
Package type: 0805 (2012 Metric) (physical and electrical footprint compatibility)
Power rating: minimum 0.125W (1/8W)
Composition: Thin Film (electrical performance characteristics)
Operating temperature range: minimum -55°C ~ 155°C coverage

Performance Enhancement Parameters:

Tolerance: ±0.25% or better (±0.1%, ±0.05%)
Temperature coefficient: ±25ppm/°C or better (±10ppm/°C)
Automotive qualification: AEC-Q200 (preferred for reliability)
Anti-sulfur coating: preferred for environmental protection

Substitute parts are grouped into three categories: Upgrade parts from Susumu (improved tolerance and temperature coefficient), Direct equivalents from alternative manufacturers (matching electrical specifications), and Upgrade parts from other manufacturers (enhanced performance characteristics).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Operating Temp (°C)	AEC-Q200	Anti-Sulfur	Product Status
RG2012P-49R9-C-T5	Susumu	49.9	±0.25%	0.125	±25	-55 ~ 155	Yes	Yes	Obsolete
RG2012N-49R9-B-T5	Susumu	49.9	±0.1%	0.125	±10	-55 ~ 155	Yes	Yes	Active
RG2012N-49R9-W-T1	Susumu	49.9	±0.05%	0.125	±10	-55 ~ 155	Yes	Yes	Active
RG2012P-49R9-B-T5	Susumu	49.9	±0.1%	0.125	±25	-55 ~ 155	Yes	Yes	Active
RG2012P-49R9-W-T5	Susumu	49.9	±0.05%	0.125	±25	-55 ~ 155	Yes	Yes	Active
9-1625868-4	TE Connectivity	49.9	±0.1%	0.25	±25	-55 ~ 155	No	No	Active
MCU08050D4999CP100	Vishay	49.9	±0.25%	0.125	±25	-55 ~ 125	No	Yes	Active
RT0805CRD0749R9L	YAGEO	49.9	±0.25%	0.125	±25	-55 ~ 155	No	No	Active
ERA-6AEB49R9V	Panasonic	49.9	±0.1%	0.125	±25	-55 ~ 155	Yes	No	Active
MCU08050D4999BP100	Vishay	49.9	±0.1%	0.125	±25	-55 ~ 125	No	Yes	Active
MCU0805MD4999BP100	Vishay	49.9	±0.1%	0.125	±25	-55 ~ 155	Yes	Yes	Active

Engineering Selection Recommendations

Primary Recommendation: RG2012N-49R9-W-T1 (Susumu)

This part provides the highest performance upgrade within the same manufacturer family. It maintains all automotive AEC-Q200 qualifications and anti-sulfur coating of the original part while improving tolerance to ±0.05% and reducing temperature coefficient to ±10ppm/°C. Active product status ensures long-term availability. Inventory of 3063 units supports production requirements.

Secondary Recommendation: RG2012N-49R9-B-T5 (Susumu)

This part offers balanced performance improvement with ±0.1% tolerance and ±10ppm/°C temperature coefficient. It retains full automotive AEC-Q200 qualification and anti-sulfur protection. Active status with 851 units in stock provides reliable supply.

Alternative Recommendation: MCU0805MD4999BP100 (Vishay)

This part matches the original operating temperature range (-55°C ~ 155°C) and includes AEC-Q200 automotive qualification with anti-sulfur coating. The ±0.1% tolerance and moisture-resistant features provide enhanced reliability. Active product status with 1150 units in inventory.

Functional Equivalent: ERA-6AEB49R9V (Panasonic)

This part provides ±0.1% tolerance with AEC-Q200 automotive qualification. Operating temperature range matches the original specification. Highest inventory availability (77311 units) ensures supply continuity. Suitable for applications where anti-sulfur coating is not critical.

Higher Power Alternative: 9-1625868-4 (TE Connectivity)

This part doubles the power rating to 0.25W (1/4W) while maintaining 49.9 Ohms resistance and ±0.1% tolerance. Suitable for applications requiring increased thermal margin. Note: lacks automotive AEC-Q200 qualification and anti-sulfur coating. Highest inventory (17542 units).

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with lower tolerance than the original RG2012P-49R9-C-T5?

A: No. The original part specifies ±0.25% tolerance. Substitute parts must maintain this tolerance or provide tighter tolerance (±0.1%, ±0.05%). Lower tolerance parts offer improved precision and are direct upgrades.

Q: What is the significance of the 0805 package specification?

A: The 0805 (2012 Metric) package defines the physical dimensions (2.00mm length × 1.25mm width) and electrical footprint. All substitute parts must use identical 0805 packaging to ensure PCB compatibility without layout modifications.

Q: Why do some substitute parts have different operating temperature ranges?

A: The original RG2012P-49R9-C-T5 operates from -55°C to 155°C. Substitute parts from Vishay (MCU series) operate to 125°C maximum. Selection depends on application requirements. For full temperature range coverage, select parts specifying -55°C ~ 155°C.

Q: Is AEC-Q200 automotive qualification required for my application?

A: AEC-Q200 qualification indicates automotive-grade reliability testing and is required for automotive applications. Non-automotive applications may use parts without this certification. The original part includes AEC-Q200; Susumu and Panasonic substitutes maintain this qualification.

Q: What does anti-sulfur coating provide?

A: Anti-sulfur coating protects the resistor from sulfur-containing environmental contaminants that can degrade performance. The original part includes this feature. Most Susumu and Vishay substitutes retain anti-sulfur protection; Panasonic and YAGEO parts do not specify this feature.

Q: Can I substitute the RG2012P-49R9-C-T5 with a higher power-rated part like 9-1625868-4?

A: Yes, from an electrical standpoint. The 0.25W (1/4W) rating of 9-1625868-4 exceeds the 0.125W requirement. However, this part lacks AEC-Q200 qualification and anti-sulfur coating. Use only if your application does not require automotive qualification.

Q: What is the difference between temperature coefficient values?

A: Temperature coefficient (ppm/°C) indicates resistance change per degree Celsius. The original part specifies ±25ppm/°C. Lower values (±10ppm/°C) indicate better stability across temperature variations. For precision applications, select parts with ±10ppm/°C or better.

Q: Why is the RG2012P-49R9-C-T5 marked as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Active substitute parts from the same manufacturer (RG2012N series) provide improved specifications and guaranteed long-term availability.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, matching the environmental compliance of the original part.

Q: What is Moisture Sensitivity Level (MSL) 1?

A: MSL 1 indicates unlimited shelf life without moisture exposure controls. All listed parts carry MSL 1 rating, requiring no special storage conditions.

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