RS3GB-T Equivalent & Substitute Parts

Part Overview

The RS3GB-T is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 400 V DC reverse voltage and 3 A average rectified current in a surface mount DO-214AA (SMB) package. This diode is classified as a fast recovery device with a reverse recovery time of 150 ns, suitable for standard rectification applications requiring moderate voltage and current ratings. The part is Active in product status and fully compliant with RoHS3 and REACH regulations. Substitute parts are identified when electrical parameters, mechanical packaging, and thermal characteristics remain within the specified tolerances of the original design.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 3 A	V
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5 @ 400 V	µA
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55 to 150	°C
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—

Substitute Part Grouping Explanation

Substitute parts for the RS3GB-T are identified based on strict equivalence of the following critical parameters:

Voltage Rating: DC reverse voltage (Vr) must equal 400 V
Current Rating: Average rectified current (Io) must equal 3 A
Forward Voltage: Maximum forward voltage (Vf) must not exceed 1.3 V at 3 A
Recovery Characteristics: Reverse recovery time (trr) must equal 150 ns with fast recovery classification
Reverse Leakage: Maximum reverse leakage current must not exceed 5 µA at 400 V
Package: Surface mount DO-214AA (SMB) package required
Temperature Range: Operating junction temperature range must span -55°C to 150°C
Compliance: RoHS3 and REACH compliance required

The RS3GB-HF manufactured by Comchip Technology meets all these criteria and is therefore classified as a parametric equivalent substitute.

Parameter Comparison

Parameter	RS3GB-T (Taiwan Semiconductor)	RS3GB-HF (Comchip Technology)	Match Status
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	Equivalent
Current - Average Rectified (Io)	3 A	3 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 3 A	1.3 V @ 3 A	Equivalent
Reverse Recovery Time (trr)	150 ns	150 ns	Equivalent
Current - Reverse Leakage @ Vr	5 µA @ 400 V	5 µA @ 400 V	Equivalent
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Equivalent
Package / Case	DO-214AA, SMB	DO-214AA, SMB	Equivalent
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent
Capacitance @ Vr, F	50 pF @ 4V, 1MHz	40 pF @ 4V, 1MHz	Within Tolerance

Engineering Selection Recommendations

Both the RS3GB-T and RS3GB-HF are Active products with identical electrical and thermal specifications. Selection between these parts should be based on the following factors:

Availability and Lead Time: The RS3GB-HF (Comchip Technology) maintains higher inventory levels (4024 pcs) compared to the RS3GB-T (994 pcs), making it suitable for applications requiring immediate availability or high-volume procurement.

Regulatory Compliance: Both parts satisfy RoHS3 and REACH requirements, ensuring compliance with current environmental and hazardous substance regulations applicable to electronic components in the EU and equivalent markets.

Capacitance Variation: The RS3GB-HF exhibits a capacitance of 40 pF at 4 V, 1 MHz, compared to 50 pF for the RS3GB-T. This 10 pF difference remains within acceptable tolerances for general-purpose rectification applications and does not affect switching or thermal performance.

Thermal Performance: Both parts operate across the identical junction temperature range of -55°C to 150°C, ensuring equivalent thermal stability in end-use applications.

Manufacturing Consistency: Both manufacturers employ standard diode technology with identical fast recovery characteristics, ensuring consistent performance in rectification circuits.

Frequently Asked Questions (FAQ)

Q: Can RS3GB-HF be used as a direct replacement for RS3GB-T in existing designs?

A: Yes. The RS3GB-HF meets all critical electrical parameters (voltage, current, forward voltage, recovery time, and leakage current) and shares the identical DO-214AA (SMB) package footprint. No circuit modifications are required.

Q: What is the significance of the 10 pF capacitance difference between these parts?

A: The capacitance difference (50 pF vs. 40 pF at 4 V, 1 MHz) is within normal manufacturing tolerances for general-purpose rectifier diodes. This variation does not impact rectification performance, switching speed, or thermal characteristics in standard applications.

Q: Are both parts suitable for high-frequency switching applications?

A: Both parts are classified as fast recovery diodes with 150 ns reverse recovery time. They are suitable for applications operating at frequencies up to several hundred kilohertz. For applications exceeding 1 MHz, additional circuit analysis is recommended.

Q: Do both parts require identical PCB footprints?

A: Yes. Both the RS3GB-T and RS3GB-HF use the DO-214AA (SMB) surface mount package, requiring identical PCB land patterns and assembly processes.

Q: What is the moisture sensitivity level for these parts?

A: Both parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling and storage procedures apply without special desiccant or humidity control requirements.

Q: Are there any temperature derating considerations when selecting between these parts?

A: No. Both parts operate across -55°C to 150°C junction temperature range with identical thermal characteristics. Derating curves and thermal management strategies remain unchanged between the two parts.

Q: Can these parts be used in automotive or industrial applications?

A: Both parts are classified as standard technology diodes with Active product status and full RoHS3/REACH compliance. Application suitability depends on specific circuit requirements and end-use environmental conditions, not on the choice between these equivalent parts.

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