RS3B R7 Equivalent & Substitute Parts

Part Overview

The RS3B R7 is a general-purpose fast recovery rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 100 V DC reverse voltage and 3 A average rectified current in a DO-214AB (SMC) surface mount package. This component is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design support and procurement.

The RS3B R7 serves as a standard rectification element in power supply circuits, switching applications, and general-purpose rectification where fast recovery characteristics are required. Equivalent parts maintain identical electrical performance within specified tolerances, while substitute parts offer compatible functionality with minor parameter variations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 3 A	V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	10	µA @ 100 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the RS3B R7 is determined by strict equivalence in the following critical parameters:

Primary Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 100 V
Current - Average Rectified (Io): 3 A
Reverse Recovery Time (trr): 150 ns
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 150°C

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max): 1.3 V (at 3 A or 2.5 A)
Current - Reverse Leakage: 10 µA @ 100 V (or lower)
RoHS3 Compliance
MSL Level 1

Parts are grouped into three categories:

Category 1: Direct Equivalents (Taiwan Semiconductor Corporation) Parts with identical electrical specifications and packaging variants: RS3B, RS3B R7G, RS3B V7G

Category 2: Manufacturer Variants (Vishay General Semiconductor - Diodes Division) Parts meeting all critical parameters with minor forward voltage specification differences (1.3 V @ 2.5 A vs. 3 A) and capacitance variations: RS3B-E3/57T, RS3B-E3/9AT, RS3B-M3/57T, RS3B-M3/9AT, RS3BHE3_A/H

Category 3: Cross-Manufacturer Equivalents Parts from alternative manufacturers meeting all critical electrical and mechanical specifications: RS3BC-HF (Comchip Technology), RS3BH (Taiwan Semiconductor Corporation - Automotive Grade)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	trr [ns]	Ir @ Vr [µA]	Package	Packaging Type	Product Status	Grade
RS3B R7	Taiwan Semiconductor Corporation	100	3	1.3 @ 3A	150	10 @ 100V	DO-214AB	—	Discontinued	Standard
RS3B	Taiwan Semiconductor Corporation	100	3	1.3 @ 3A	150	10 @ 100V	DO-214AB	Tape & Reel	Active	Standard
RS3B R7G	Taiwan Semiconductor Corporation	100	3	1.3 @ 3A	150	10 @ 100V	DO-214AB	Cut Tape	Discontinued	Standard
RS3B V7G	Taiwan Semiconductor Corporation	100	3	1.3 @ 3A	150	10 @ 100V	DO-214AB	Cut Tape & Digi-Reel	Discontinued	Standard
RS3BH	Taiwan Semiconductor Corporation	100	3	1.3 @ 3A	150	10 @ 100V	DO-214AB	—	Active	Automotive (AEC-Q101)
RS3B-E3/57T	Vishay General Semiconductor	100	3	1.3 @ 2.5A	150	10 @ 100V	DO-214AB	Cut Tape	Active	Standard
RS3B-E3/9AT	Vishay General Semiconductor	100	3	1.3 @ 2.5A	150	10 @ 100V	DO-214AB	Tape & Reel	Active	Standard
RS3B-M3/57T	Vishay General Semiconductor	100	3	1.3 @ 2.5A	150	10 @ 100V	DO-214AB	Tape & Reel	Active	Standard
RS3B-M3/9AT	Vishay General Semiconductor	100	3	1.3 @ 2.5A	150	10 @ 100V	DO-214AB	Tape & Reel	Active	Standard
RS3BC-HF	Comchip Technology	100	3	1.3 @ 3A	150	5 @ 100V	DO-214AB	Tape & Reel	Active	Standard
RS3BHE3_A/H	Vishay General Semiconductor	100	3	1.3 @ 2.5A	150	10 @ 100V	DO-214AB	Tape & Reel	Active	Automotive (AEC-Q101)

Engineering Selection Recommendations

For Standard Applications (Non-Automotive):

The RS3B (Tape & Reel packaging) is the primary active equivalent to the discontinued RS3B R7. This part maintains identical electrical specifications and is currently in active production status with 2300 pieces in stock. The RS3B is suitable for direct replacement in applications where the original packaging format is not critical.

For applications requiring specific packaging formats, RS3B R7G (Cut Tape) and RS3B V7G (Cut Tape & Digi-Reel) provide identical electrical performance, though both are discontinued at DiGi Electronics.

Vishay General Semiconductor variants (RS3B-E3/57T, RS3B-E3/9AT, RS3B-M3/57T, RS3B-M3/9AT, RS3BHE3_A/H) are active alternatives with forward voltage specifications at 2.5 A instead of 3 A. These parts are suitable for applications where the forward voltage characteristic at reduced current is acceptable. All Vishay variants are in active production.

The RS3BC-HF (Comchip Technology) offers an alternative with improved reverse leakage characteristics (5 µA vs. 10 µA @ 100 V) and is actively produced in Tape & Reel packaging.

For Automotive Applications:

The RS3BH (Taiwan Semiconductor Corporation) and RS3BHE3_A/H (Vishay General Semiconductor) are automotive-grade equivalents qualified to AEC-Q101. Both maintain the 100 V / 3 A specifications and 150 ns reverse recovery time. RS3BH is currently in active production with 975 pieces in stock. RS3BHE3_A/H is also active with 778 pieces in stock and is available in Tape & Reel packaging.

Compliance Considerations:

All listed equivalents and substitutes are ROHS3 compliant, MSL Level 1 (Unlimited moisture sensitivity), and carry EAR99 ECCN classification. No additional compliance verification is required for standard industrial applications.

Frequently Asked Questions (FAQ)

Q: Can RS3B R7 be directly replaced with RS3B?

A: Yes. The RS3B is a direct electrical equivalent with identical voltage, current, and recovery time specifications. The primary difference is packaging format: RS3B is supplied in Tape & Reel, while RS3B R7 was supplied in bulk. Both are DO-214AB surface mount packages suitable for automated assembly.

Q: What is the difference between Taiwan Semiconductor Corporation and Vishay variants?

A: Taiwan Semiconductor Corporation parts (RS3B, RS3B R7G, RS3B V7G, RS3BH) specify forward voltage at 3 A. Vishay variants (RS3B-E3/57T, RS3B-E3/9AT, RS3B-M3/57T, RS3B-M3/9AT, RS3BHE3_A/H) specify forward voltage at 2.5 A. Both meet the 1.3 V maximum specification. Vishay parts include capacitance specifications (34–44 pF @ 4V, 1MHz) not provided for Taiwan Semiconductor parts. All maintain identical reverse voltage, current rating, and recovery time.

Q: Are automotive-grade parts (RS3BH, RS3BHE3_A/H) suitable for non-automotive applications?

A: Yes. Automotive-grade parts exceed standard industrial requirements and are fully compatible with non-automotive designs. AEC-Q101 qualification ensures additional reliability and consistency. Use of automotive-grade parts in standard applications introduces no compatibility issues.

Q: What is the significance of packaging type (Tape & Reel vs. Cut Tape)?

A: Packaging type affects procurement and assembly logistics only. Tape & Reel (TR) is standard for high-volume automated pick-and-place assembly. Cut Tape (CT) is used for lower-volume or manual assembly. Electrical performance and package dimensions (DO-214AB) are identical. Selection depends on production volume and assembly equipment capability.

Q: Can RS3BC-HF (Comchip Technology) be used as a direct substitute?

A: Yes. RS3BC-HF meets all critical electrical specifications: 100 V reverse voltage, 3 A current rating, 150 ns recovery time, and DO-214AB packaging. The reverse leakage specification is superior (5 µA vs. 10 µA @ 100 V). This part is actively produced and suitable for direct replacement.

Q: Why do some parts specify forward voltage at 2.5 A instead of 3 A?

A: Forward voltage varies with current. Vishay parts specify Vf at 2.5 A, which is within the 3 A maximum rating. The 1.3 V maximum specification is met at both current levels. This difference reflects manufacturer datasheet conventions and does not affect circuit compatibility.

Q: Is moisture sensitivity a concern for these parts?

A: No. All listed parts carry MSL Level 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling and storage practices are sufficient. No special dry-pack or bake-out procedures are required.

Q: What is the recommended substitute if the original packaging is no longer available?

A: For Tape & Reel applications, use RS3B (active, 2300 pcs in stock). For applications where packaging format is not critical, any active part from the comparison table is suitable. Vishay variants (RS3B-E3/9AT, RS3B-M3/9AT) and RS3BC-HF are all actively produced with adequate inventory.

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