1SMB40CA BK PBFREE Equivalent & Substitute Parts

Part Overview

The 1SMB40CA BK PBFREE is a transient voltage suppressor (TVS) diode manufactured by Central Semiconductor Corp, designed for general-purpose overvoltage protection in surface mount applications. This bidirectional Zener diode features a 40V reverse standoff voltage with 64.5V clamping capability and 9.3A peak pulse current handling. The part is actively produced and RoHS3 compliant with unlimited moisture sensitivity rating.

Equivalent and substitute parts are identified based on matching electrical performance parameters within the SMB/DO-214AA package family. Substitutes maintain the same reverse standoff voltage, breakdown voltage, clamping voltage, and peak pulse current specifications to ensure direct functional replacement in circuit protection applications.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	40	V
Voltage - Breakdown (Min)	44.4	V
Voltage - Clamping (Max) @ Ipp	64.5	V
Current - Peak Pulse (10/1000µs)	9.3	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-65 to 150	°C (TJ)
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the 1SMB40CA BK PBFREE are qualified based on the following electrical and mechanical parameters:

Voltage - Reverse Standoff: 40V (exact match required)
Voltage - Breakdown (Min): 44.4V (exact match required)
Voltage - Clamping (Max) @ Ipp: 64.5V (exact match required)
Current - Peak Pulse (10/1000µs): 9.3A minimum
Package / Case: DO-214AA or SMB (mechanically compatible)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Parts meeting these criteria are functionally equivalent for direct circuit substitution. Variations in peak pulse current above 9.3A, operating temperature range, and packaging format (tape & reel vs. bulk) do not affect electrical substitutability but may impact procurement and thermal performance considerations.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package	Product Status
1SMB40CA BK PBFREE	Central Semiconductor Corp	40	44.4	64.5	9.3	600	DO-214AA, SMB	Active
ATV06B400JB-HF	Comchip Technology	40	44.4	64.5	9.3	600	DO-214AA, SMB	Active
SM6T47CAY	STMicroelectronics	40	44.4	84	48	600	DO-214AA, SMB	Active
SMB10J40CAHR5G	Taiwan Semiconductor Corporation	40	44.4	64.5	15.5	1000	DO-214AA, SMB	Discontinued at DiGi Electronics
SMBJ40CA	MDD	40	44.4	64.5	9.3	600	DO-214AA, SMB	Active
SMBJ40CA R5G	Taiwan Semiconductor Corporation	40	44.4	64.5	9.7	600	DO-214AA, SMB	Discontinued at DiGi Electronics
SMBJ40CA-13-F	Diodes Incorporated	40	44.4	64.5	9.3	600	DO-214AA, SMB	Active
SMBJ40CA-E3/52	Vishay General Semiconductor - Diodes Division	40	44.4	64.5	9.3	600	DO-214AA, SMB	Active
SMBJ40CA-E3/5B	Vishay General Semiconductor - Diodes Division	40	44.4	64.5	9.3	600	DO-214AA, SMB	Active

Engineering Selection Recommendations

Preferred Active Substitutes (Direct Replacement)

ATV06B400JB-HF, SMBJ40CA, SMBJ40CA-13-F, SMBJ40CA-E3/52, and SMBJ40CA-E3/5B are all actively produced and maintain identical electrical specifications to the 1SMB40CA BK PBFREE. These parts are suitable for direct substitution in new designs and production environments. ATV06B400JB-HF carries AEC-Q101 automotive qualification, providing enhanced reliability for automotive and industrial applications.

Extended Performance Substitute

SM6T47CAY (STMicroelectronics) provides higher clamping voltage (84V) and significantly higher peak pulse current (48A with 8/20µs pulse), offering enhanced transient protection capability. This part is suitable when circuit design permits higher clamping voltage or when additional surge current handling is required. SM6T47CAY also carries AEC-Q101 qualification.

Discontinued Parts (Not Recommended for New Designs)

SMB10J40CAHR5G and SMBJ40CA R5G are discontinued at DiGi Electronics. While electrically compatible, these parts should not be selected for new production due to limited availability and supply chain risk.

Frequently Asked Questions (FAQ)

Q: Can SM6T47CAY be used as a direct replacement for 1SMB40CA BK PBFREE?

A: SM6T47CAY shares the same 40V reverse standoff and 44.4V breakdown voltage but features 84V clamping voltage versus 64.5V. This higher clamping voltage may affect circuit performance if the design relies on the lower 64.5V clamping threshold. Verify circuit tolerance to higher clamping voltage before substitution.

Q: What is the difference between tape & reel and bulk packaging?

A: Tape & reel packaging is suitable for automated assembly lines and high-volume production. Bulk packaging is used for manual assembly or lower-volume applications. Both formats contain identical components; packaging selection depends on manufacturing process requirements, not electrical performance.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant and REACH unaffected, matching the compliance status of the 1SMB40CA BK PBFREE.

Q: Which substitute offers the best thermal performance?

A: SMB10J40CAHR5G provides 1000W peak pulse power versus 600W for the main part, enabling better thermal dissipation during transient events. However, this part is discontinued. Among active substitutes, all maintain 600W peak pulse power rating.

Q: Can I use parts with higher peak pulse current ratings?

A: Yes. Parts with peak pulse current ratings above 9.3A (such as SMB10J40CAHR5G at 15.5A or SM6T47CAY at 48A) are backward compatible and provide additional surge handling margin. Verify that higher current capability does not introduce unintended circuit behavior.

Q: What is the operating temperature range consideration for substitution?

A: The 1SMB40CA BK PBFREE operates from -65°C to 150°C. Most substitutes operate from -55°C to 150°C, providing slightly narrower low-temperature range. For applications requiring -65°C operation, verify substitute specifications before selection.

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