AS3BJHM3/5BT Equivalent & Substitute Parts

Part Overview

The AS3BJHM3/5BT is a 600V, 3A avalanche diode in DO-214AA (SMB) surface mount package manufactured by Vishay General Semiconductor - Diodes Division. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives. The diode is designed for general-purpose rectification applications requiring avalanche breakdown protection at 600V reverse voltage with 3A average rectified current capacity.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	600 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	1.05 V @ 3 A
Reverse Recovery Time (trr)	1.5 µs
Current - Reverse Leakage @ Vr	20 µA @ 600 V
Capacitance @ Vr, F	40 pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 175°C
Technology	Avalanche
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the AS3BJHM3/5BT is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 600 V
Current - Average Rectified (Io): 3 A
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount

Allowable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Substitute parts may vary within acceptable circuit design margins
Reverse Recovery Time (trr): Substitute parts with faster recovery (≤500ns) are acceptable for standard recovery applications
Current - Reverse Leakage @ Vr: Lower leakage values are acceptable
Operating Temperature Range: Substitute parts with equal or wider temperature ranges are acceptable
Technology: Both avalanche and standard recovery diodes are functionally equivalent at the specified voltage and current ratings

Substitute parts are grouped into two categories: direct voltage/current equivalents (600V, 3A) and lower current alternatives (600V, 1A or 2A) suitable for applications with reduced current requirements.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	trr (µs/ns)	Ir @ Vr	Package	Product Status
AS3BJHM3/5BT	Vishay	600 V	3 A	1.05 V @ 3 A	1.5 µs	20 µA @ 600 V	DO-214AA	Discontinued
AS3BJHM3_A/I	Vishay	600 V	2 A	1.05 V @ 3 A	1.5 µs	20 µA @ 600 V	DO-214AA	Active
ER3JB-TP	Micro Commercial Co	600 V	3 A	1.7 V @ 3 A	35 ns	5 µA @ 600 V	DO-214AA	Active
S3JB	HY Electronic	600 V	3 A	1.1 V @ 3 A	>500 ns	5 µA @ 600 V	DO-214AA	Active
S3JB-13-F	Diodes Incorporated	600 V	3 A	1.15 V @ 3 A	>500 ns	10 µA @ 600 V	DO-214AA	Active
S3JB-TP	Micro Commercial Co	600 V	3 A	1.15 V @ 3 A	>500 ns	10 µA @ 600 V	DO-214AA	Active
STTH1L06U	STMicroelectronics	600 V	1 A	1.3 V @ 1 A	80 ns	1 µA @ 600 V	DO-214AA	Active
STTH1R06U	STMicroelectronics	600 V	1 A	1.7 V @ 1 A	45 ns	1 µA @ 600 V	DO-214AA	Active
STTH2L06U	STMicroelectronics	600 V	2 A	1.3 V @ 2 A	85 ns	2 µA @ 600 V	DO-214AA	Active
STTH2R06U	STMicroelectronics	600 V	2 A	1.7 V @ 2 A	50 ns	2 µA @ 600 V	DO-214AA	Active
STTH3L06U	STMicroelectronics	600 V	3 A	1.3 V @ 3 A	85 ns	3 µA @ 600 V	DO-214AA	Active

Engineering Selection Recommendations

Direct Equivalents (600V, 3A Current Rating):

The following parts provide direct functional equivalence to the AS3BJHM3/5BT with identical voltage and current specifications:

S3JB (HY Electronic): Active product with AEC-Q101 automotive qualification. Forward voltage of 1.1 V @ 3 A closely matches the original specification. Standard recovery characteristics. ROHS3 compliant.
S3JB-13-F (Diodes Incorporated): Active product with standard recovery speed. Forward voltage of 1.15 V @ 3 A. ROHS3 compliant and REACH unaffected. Operating temperature range -65°C to 150°C.
S3JB-TP (Micro Commercial Co): Active product with standard recovery characteristics. Forward voltage of 1.15 V @ 3 A. ROHS3 compliant. Highest inventory availability among direct equivalents.
ER3JB-TP (Micro Commercial Co): Active product with fast recovery characteristics (35 ns). Forward voltage of 1.7 V @ 3 A. Suitable for applications requiring faster switching performance. ROHS3 compliant.

Lower Current Alternatives (600V, 1A or 2A):

The STTH series from STMicroelectronics provides 600V rated alternatives at reduced current ratings:

STTH3L06U (STMicroelectronics): 600V, 3A rating with fast recovery (85 ns). Forward voltage of 1.3 V @ 3 A. Operating temperature to 175°C maximum. ROHS3 compliant.
STTH2L06U or STTH2R06U (STMicroelectronics): 600V, 2A alternatives with fast recovery characteristics. Suitable for applications with reduced current requirements.
STTH1L06U or STTH1R06U (STMicroelectronics): 600V, 1A alternatives. Suitable only for applications with significantly reduced current demands.

Automotive Applications:

For automotive-grade requirements, S3JB with AEC-Q101 qualification is the recommended direct equivalent.

Compliance Considerations:

All substitute parts listed are ROHS3 compliant and suitable for applications requiring regulatory compliance. Moisture sensitivity level is 1 (Unlimited) for all parts, matching the original specification.

Frequently Asked Questions (FAQ)

Q: Can I use a lower current rated diode (1A or 2A) as a substitute for the 3A AS3BJHM3/5BT?

A: Lower current rated diodes are not suitable as direct substitutes if your application requires the full 3A current capacity. The STTH1 and STTH2 series are rated for 1A and 2A respectively and will not safely handle 3A continuous current. Use these only if your actual circuit current requirement is at or below their rated capacity.

Q: What is the difference between avalanche and standard recovery diodes in this voltage class?

A: The AS3BJHM3/5BT uses avalanche technology with 1.5 µs reverse recovery time. Standard recovery diodes like the S3JB series have similar recovery characteristics (>500 ns). Fast recovery alternatives like STTH3L06U have significantly faster recovery (85 ns). All are functionally equivalent at 600V, 3A for general rectification applications. Technology selection depends on switching frequency requirements in your specific circuit.

Q: Are all substitute parts available in the same DO-214AA package?

A: Yes. All substitute parts listed are available in DO-214AA (SMB) surface mount package, ensuring mechanical and electrical compatibility with the original PCB layout.

Q: What is the significance of forward voltage differences between substitute parts?

A: Forward voltage variations (1.05 V to 1.7 V @ 3 A) affect power dissipation and heat generation. Lower forward voltage (S3JB at 1.1 V) results in less power loss. Higher forward voltage (ER3JB-TP at 1.7 V) results in greater power dissipation. Select based on your thermal design requirements and circuit operating conditions.

Q: Can I use ER3JB-TP with its 35 ns recovery time instead of the original 1.5 µs?

A: Yes. Faster recovery time is a performance enhancement suitable for higher frequency switching applications. The ER3JB-TP will function correctly in circuits designed for the original part and will provide improved switching characteristics.

Q: Is the AS3BJHM3_A/I variant a suitable substitute despite its 2A rating?

A: The AS3BJHM3_A/I is rated for 2A, not 3A. It is not a suitable direct substitute if your application requires the full 3A capacity. However, it is suitable if your actual circuit current requirement is 2A or less. This variant is from the same manufacturer (Vishay) and offers the same avalanche technology and forward voltage characteristics.

Q: What packaging options are available for substitute parts?

A: All substitute parts are available in Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel® packaging formats. Verify packaging compatibility with your procurement and assembly processes. The physical DO-214AA (SMB) package remains consistent across all alternatives.

Q: Are there automotive-qualified alternatives?

A: Yes. The S3JB from HY Electronic carries AEC-Q101 automotive qualification, making it suitable for automotive applications requiring this certification level.

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