1SMB9.0AT3 Equivalent & Substitute Parts

Part Overview

The 1SMB9.0AT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface mount applications. This component features a 9V reverse standoff voltage with 15.4V maximum clamping voltage and 39A peak pulse current capability in the DO-214AA (SMB) package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	1SMB9.0AT3
Manufacturer	onsemi
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	9V
Voltage - Breakdown (Min)	10V
Voltage - Clamping (Max) @ Ipp	15.4V
Current - Peak Pulse (10/1000µs)	39A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Operating Temperature	-65°C ~ 150°C (TJ)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the 1SMB9.0AT3 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff: 9V (nominal)
Voltage - Breakdown (Min): 10V
Voltage - Clamping (Max) @ Ipp: 15.4V (±tolerance acceptable)
Current - Peak Pulse (10/1000µs): 39A minimum
Power - Peak Pulse: 600W
Package / Case: DO-214AA or SMB (mechanically compatible)
Type: Zener TVS diode, unidirectional

Substitution Categories:

Direct Equivalents maintain all critical electrical parameters within specification and are manufactured by different suppliers with active product status.

Similar Substitutes maintain the core voltage and current ratings but may have minor variations in clamping voltage (within ±1.5V) or peak pulse current (within ±1A) while preserving functional compatibility for general-purpose protection applications.

Non-Equivalent Parts are excluded from substitution consideration. The 1SMB5955BT3G (180V Zener diode) operates at a fundamentally different voltage class and is not suitable for 9V protection circuits.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package	Operating Temperature	Product Status	RoHS Status
1SMB9.0AT3	onsemi	9V	10V	15.4V	39A	600W	DO-214AA, SMB	-65°C ~ 150°C	Obsolete	RoHS non-compliant
SMBJ9.0A	Taiwan Semiconductor Corporation	9V	10V	15.4V	40A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ9.0A-13-F	Diodes Incorporated	9V	10V	15.4V	39A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ9.0A-HR	Littelfuse Inc.	9V	10V	15.4V	39A	600W	DO-214AA, SMB	-65°C ~ 150°C	Active	ROHS3 Compliant
SMBJ9.0A-HRA	Littelfuse Inc.	9V	10V	15.4V	39A	600W	DO-214AA, SMB	-65°C ~ 150°C	Active	ROHS3 Compliant
SMBJ9.0A-M3/52	Vishay General Semiconductor - Diodes Division	9V	10V	15.4V	39A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ9.0A-M3/5B	Vishay General Semiconductor - Diodes Division	9V	10V	15.4V	39A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ9.0E3/TR13	Microchip Technology	9V	10V	16.9V	35.5A	600W	DO-214AA, SMB	-65°C ~ 150°C	Active	ROHS3 Compliant
SMBJ9V0A	Taiwan Semiconductor Corporation	9V	10V	15.4V	39A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Preferred Direct Equivalents (Highest Compatibility):

SMBJ9.0A-HR and SMBJ9.0A-HRA (Littelfuse Inc.) are the optimal substitutes. Both maintain identical electrical specifications to the 1SMB9.0AT3, including 9V reverse standoff, 15.4V clamping voltage, and 39A peak pulse current. Both extend the operating temperature range to -65°C ~ 150°C, matching the original part. Both are ROHS3 compliant and carry active product status, ensuring long-term availability and supply chain stability.

Alternative Direct Equivalents:

SMBJ9.0A (Taiwan Semiconductor Corporation) and SMBJ9V0A (Taiwan Semiconductor Corporation) provide identical electrical performance with active status and ROHS3 compliance. The operating temperature range is -55°C ~ 150°C, which is acceptable for most applications but does not extend to the lower -65°C limit of the original part.

SMBJ9.0A-13-F (Diodes Incorporated) and SMBJ9.0A-M3/52 and SMBJ9.0A-M3/5B (Vishay General Semiconductor - Diodes Division) maintain full electrical equivalence with active status and ROHS3 compliance. Operating temperature ranges are -55°C ~ 150°C for Diodes Incorporated and Vishay variants.

Acceptable Similar Substitute:

SMBJ9.0E3/TR13 (Microchip Technology) operates at 9V reverse standoff with 10V minimum breakdown voltage but exhibits a higher clamping voltage of 16.9V and reduced peak pulse current of 35.5A. This part is suitable for applications where the higher clamping voltage is acceptable and peak pulse current requirements do not exceed 35.5A. Operating temperature range is -65°C ~ 150°C with ROHS3 compliance and active status.

Compliance Considerations:

The original 1SMB9.0AT3 is RoHS non-compliant and obsolete. All recommended substitutes are ROHS3 compliant and carry active product status, providing regulatory alignment and supply chain continuity for new designs and production transitions.

Frequently Asked Questions (FAQ)

Q: Can SMBJ9.0A be used as a direct replacement for 1SMB9.0AT3?

A: Yes. SMBJ9.0A maintains identical electrical specifications: 9V reverse standoff, 15.4V clamping voltage, and 40A peak pulse current (exceeding the original 39A requirement). The DO-214AA (SMB) package is mechanically compatible. The operating temperature range is -55°C ~ 150°C, which covers standard industrial applications. ROHS3 compliance provides regulatory advantage over the obsolete original part.

Q: What is the difference between SMBJ9.0A-HR and SMBJ9.0A-HRA?

A: Both parts are manufactured by Littelfuse Inc. and maintain identical electrical specifications and operating temperature ranges (-65°C ~ 150°C). The designation difference reflects internal Littelfuse product line variants. Both are suitable substitutes with equivalent performance characteristics.

Q: Why is SMBJ9.0E3/TR13 listed as a similar substitute rather than a direct equivalent?

A: SMBJ9.0E3/TR13 exhibits a clamping voltage of 16.9V (compared to 15.4V in the original) and reduced peak pulse current of 35.5A (compared to 39A). While the 9V reverse standoff voltage is maintained, the higher clamping voltage may affect circuit performance in applications with tight voltage tolerance requirements. This part is suitable only when the higher clamping voltage is acceptable and peak pulse current does not exceed 35.5A.

Q: Are all substitute parts available in the same packaging?

A: Yes. All substitute parts use the DO-214AA or SMB package designation, which are mechanically and electrically compatible. Tape & Reel (TR) packaging is available for most substitutes, supporting automated assembly processes.

Q: What compliance advantage do the substitute parts offer?

A: All recommended substitute parts are ROHS3 compliant, whereas the original 1SMB9.0AT3 is RoHS non-compliant. This compliance status is mandatory for many applications and markets. Additionally, all substitutes carry active product status, ensuring continued manufacturing and supply availability.

Q: Can I use SMBJ9V0A and SMBJ9.0A interchangeably?

A: Yes. Both parts are manufactured by Taiwan Semiconductor Corporation and maintain identical electrical specifications: 9V reverse standoff, 15.4V clamping voltage, and 39A peak pulse current. The operating temperature range is -55°C ~ 150°C for both. The designation difference reflects internal product line variants with equivalent performance.

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