SMA5J40A-M3/61 Equivalent & Substitute Parts

Part Overview

The SMA5J40A-M3/61 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates with a 40V reverse standoff voltage and provides 64.5V maximum clamping voltage at peak pulse current. The part is classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Substitute parts are identified based on matching electrical characteristics: reverse standoff voltage (40V), breakdown voltage range (44.4V minimum), and compatible DO-214AC (SMA) surface mount packaging. Alternatives are selected to maintain functional equivalence in transient voltage suppression applications while accommodating variations in clamping voltage, peak pulse current, and power dissipation ratings.

Key Parameters

Parameter	SMA5J40A-M3/61
Manufacturer	Vishay General Semiconductor - Diodes Division
Type	Zener TVS Diode
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	40V
Voltage - Breakdown (Min)	44.4V
Voltage - Clamping (Max) @ Ipp	64.5V
Current - Peak Pulse (10/1000µs)	7.8A
Power - Peak Pulse	500W
Operating Temperature	-55°C ~ 150°C (TJ)
Package / Case	DO-214AC, SMA
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the SMA5J40A-M3/61 are grouped based on the following critical electrical and mechanical parameters:

Primary Matching Criteria:

Reverse Standoff Voltage: 40V (Typ)
Breakdown Voltage: 44.4V (Min)
Package: DO-214AC / SMA surface mount
Unidirectional configuration (1 channel)
Zener TVS diode type

Secondary Variation Parameters:

Clamping Voltage (Max) @ Ipp: 64.5V to 84V range
Peak Pulse Current: 6.2A to 48A (different pulse waveforms: 10/1000µs or 8/20µs)
Power Dissipation: 400W to 600W
Operating Temperature Range: -55°C to 150°C or -55°C to 175°C

All substitute parts maintain the same reverse standoff voltage and breakdown voltage specifications, ensuring functional compatibility in voltage suppression circuits. Variations in clamping voltage and peak pulse current reflect different performance grades within the 40V protection class.

Parameter Comparison

Parameter	SMA5J40A-M3/61 (Vishay)	SM4T47AY (STMicroelectronics)	SMA6J40A-TR (STMicroelectronics)	SMAJ40A (MDD)	SMAJ40A-13-F (Diodes Inc)	SMAJ40A-TP (Micro Commercial)	SMAJ40A-TR (STMicroelectronics)
Voltage - Reverse Standoff (Typ)	40V	40V	40V	40V	40V	40V	40V
Voltage - Breakdown (Min)	44.4V	44.4V	44.4V	44.4V	44.4V	44.4V	44.4V
Voltage - Clamping (Max) @ Ipp	64.5V	84V	73.6V	64.5V	64.5V	64.5V	84V
Current - Peak Pulse	7.8A (10/1000µs)	27A (8/20µs)	48A (8/20µs)	6.2A (10/1000µs)	6.2A (10/1000µs)	6.2A (10/1000µs)	27A (8/20µs)
Power - Peak Pulse	500W	400W	600W	400W	400W	400W	400W
Operating Temperature	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 175°C (TJ)	-50°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 175°C (TA)	-55°C ~ 150°C (TJ)
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Electrical Equivalents (64.5V Clamping): SMAJ40A (MDD), SMAJ40A-13-F (Diodes Incorporated), and SMAJ40A-TP (Micro Commercial Co) provide identical clamping voltage (64.5V) and peak pulse current specifications (6.2A at 10/1000µs) to the SMA5J40A-M3/61. These parts are suitable for direct substitution in applications where the original electrical performance must be maintained. All three are Active status products with RoHS3 compliance and MSL 1 rating.

Higher Performance Alternatives (Enhanced Current Handling): SM4T47AY (STMicroelectronics) and SMAJ40A-TR (STMicroelectronics) offer increased peak pulse current (27A at 8/20µs) with higher clamping voltage (84V). These parts are appropriate for applications requiring greater transient energy absorption. Both maintain the 40V reverse standoff voltage and are Active status with RoHS3 compliance.

Maximum Performance Option: SMA6J40A-TR (STMicroelectronics) provides the highest peak pulse current rating (48A at 8/20µs) and power dissipation (600W) with 73.6V clamping voltage. This part extends the operating temperature range to 175°C and is suitable for demanding transient suppression applications.

Compliance Considerations: All substitute parts maintain RoHS3 compliance, MSL 1 rating, and Active product status. SM4T47AY includes AEC-Q101 automotive qualification. Temperature range variations exist: most parts operate to 150°C, while SMA6J40A-TR and SMAJ40A-TP extend to 175°C.

Frequently Asked Questions (FAQ)

Q: Can SMAJ40A-13-F replace SMA5J40A-M3/61 directly? A: Yes. SMAJ40A-13-F matches the critical electrical parameters: 40V reverse standoff voltage, 44.4V breakdown voltage, 64.5V clamping voltage, and 6.2A peak pulse current. Both use DO-214AC (SMA) surface mount packaging. The primary difference is the manufacturer (Diodes Incorporated vs. Vishay), but electrical performance is equivalent.

Q: What is the difference between 10/1000µs and 8/20µs pulse waveforms? A: These represent different test conditions for peak pulse current measurement. The 10/1000µs waveform (used by Vishay SMA5J40A-M3/61, MDD SMAJ40A, and Diodes SMAJ40A-13-F) specifies current at a different pulse duration than the 8/20µs waveform (used by STMicroelectronics SM4T47AY, SMA6J40A-TR, and SMAJ40A-TR). Parts with 8/20µs ratings typically show higher peak current values due to the shorter pulse duration. Both waveforms are valid for transient suppression applications; selection depends on the actual transient event characteristics in your circuit.

Q: Is SMA6J40A-TR suitable for high-temperature applications? A: Yes. SMA6J40A-TR operates to 175°C junction temperature, compared to 150°C for the SMA5J40A-M3/61. If your application requires extended temperature operation, SMA6J40A-TR is appropriate. However, verify that the higher clamping voltage (73.6V vs. 64.5V) is acceptable for your circuit design.

Q: Can I use SM4T47AY in place of SMA5J40A-M3/61? A: Functionally yes, with design considerations. SM4T47AY maintains the 40V reverse standoff voltage but has higher clamping voltage (84V vs. 64.5V) and peak pulse current (27A vs. 7.8A). This part provides enhanced transient suppression capability. Verify that the higher clamping voltage does not exceed downstream component voltage ratings.

Q: Are all substitute parts available in the same packaging? A: All substitute parts use DO-214AC (SMA) surface mount packaging, ensuring mechanical compatibility. Packaging options vary by manufacturer: some are supplied in Tape & Reel (TR), Cut Tape (CT), or Digi-Reel format. Verify the specific packaging format required for your assembly process.

Q: Which substitute part has the best inventory availability? A: SMAJ40A-13-F (Diodes Incorporated) has the highest inventory at 21,847 pieces. SMAJ40A-TR (STMicroelectronics) has 40,100 pieces available. Both offer excellent supply continuity for production applications.

Q: Do all substitute parts meet RoHS3 compliance? A: Yes. All substitute parts listed are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of SMA5J40A-M3/61.

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