SMBJ11 Transient Voltage Suppressor Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ11 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features an 11V reverse standoff voltage with 19.11V maximum clamping voltage at peak pulse current of 33A, packaged in the DO-214AA (SMB) form factor. The SMBJ11 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Suitable alternatives maintain the same electrical performance envelope and mechanical compatibility while offering active product status from current manufacturers.

Key Parameters

Parameter	SMBJ11 (Littelfuse)
Voltage - Reverse Standoff (Typ)	11V
Voltage - Breakdown (Min)	11.57V
Voltage - Clamping (Max) @ Ipp	19.11V
Current - Peak Pulse (10/1000µs)	33A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature	-65°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ11 is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff: 11V (exact match required)
Voltage - Clamping (Max) @ Ipp: 18.2V to 19.11V (within tolerance band)
Current - Peak Pulse (10/1000µs): 32.97A to 54.9A (equal or greater capacity acceptable)
Package / Case: DO-214AA, SMB (mechanical compatibility)
Mounting Type: Surface Mount (assembly compatibility)
RoHS Status: ROHS3 Compliant (regulatory requirement)
Moisture Sensitivity Level: 1 (Unlimited) (handling compatibility)

Substitute Categories:

Category A - Direct Electrical & Mechanical Equivalents (11V Standoff, 18.2V Clamp, 33A Ipp):

SMBJ11A-E3/52 (Vishay)
SMBJ11A-13-F (Diodes Incorporated)
SMBJ11A-TP (Micro Commercial Co)
SMBJ11A (Meritek)
TV06B110J-G (Comchip Technology)

Category B - Enhanced Performance Substitute (11V Standoff, 18.2V Clamp, 54.9A Ipp):

SMB10J11A-E3/52 (Vishay)
SMB10J11A-E3/5B (Vishay)

Category C - Related Voltage Class (10V Standoff, 17V Clamp, 37A Ipp):

SMBJ10A-TR (STMicroelectronics)

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status
SMBJ11	Littelfuse Inc.	11V	11.57V	19.11V	33A	600W	-65°C ~ 150°C	Obsolete
SMBJ11A-E3/52	Vishay	11V	12.2V	18.2V	33A	600W	-55°C ~ 150°C	Active
SMBJ11A-13-F	Diodes Incorporated	11V	12.2V	18.2V	33A	600W	-55°C ~ 150°C	Active
SMBJ11A-TP	Micro Commercial Co	11V	12.2V	18.2V	33A	600W	-55°C ~ 175°C	Active
SMBJ11A	Meritek	11V	12.2V	18.2V	32.97A	600W	-55°C ~ 150°C	Active
TV06B110J-G	Comchip Technology	11V	12.2V	18.2V	32.97A	600W	Not specified	Active
SMB10J11A-E3/52	Vishay	11V	12.2V	18.2V	54.9A	1000W	-55°C ~ 150°C	Active
SMB10J11A-E3/5B	Vishay	11V	12.2V	18.2V	54.9A	1000W	-55°C ~ 150°C	Active
SMBJ10A-TR	STMicroelectronics	10V	11.1V	17V	37A	600W	-55°C ~ 150°C	Active

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement):

For applications requiring exact electrical and thermal performance matching, select from Category A substitutes: SMBJ11A-E3/52, SMBJ11A-13-F, SMBJ11A-TP, SMBJ11A, or TV06B110J-G. All maintain 11V reverse standoff voltage, 18.2V clamping voltage, and 33A peak pulse current. All are ROHS3 compliant with MSL 1 rating. SMBJ11A-TP offers extended upper operating temperature to 175°C compared to 150°C for other Category A parts. Vishay SMBJ11A-E3/52 and Diodes Incorporated SMBJ11A-13-F offer the highest inventory availability (45,400 and 104,200 units respectively).

Enhanced Performance Substitutes:

Vishay SMB10J11A-E3/52 and SMB10J11A-E3/5B provide increased peak pulse current (54.9A) and power dissipation (1000W) while maintaining 11V standoff and 18.2V clamping specifications. These are suitable for applications requiring higher transient energy absorption. Both are ROHS3 compliant and active products.

Alternative Voltage Class:

STMicroelectronics SMBJ10A-TR operates at 10V reverse standoff with 17V clamping voltage. This part is suitable only for applications where the lower voltage rating is acceptable and provides 37A peak pulse current. Selection of this part requires circuit-level voltage margin verification.

Compliance & Availability:

All recommended substitutes maintain ROHS3 compliance and MSL 1 moisture sensitivity rating. Inventory availability ranges from 740 to 104,200 units across suppliers, supporting both prototype and production volume requirements.

Frequently Asked Questions (FAQ)

Q: Can SMBJ11A-E3/52 directly replace SMBJ11 in existing designs?

A: Yes. SMBJ11A-E3/52 maintains identical 11V reverse standoff voltage, 18.2V clamping voltage, 33A peak pulse current, and DO-214AA SMB package. Operating temperature range is -55°C to 150°C versus the original -65°C to 150°C; verify lower temperature limit compatibility for your application.

Q: What is the difference between Category A and Category B substitutes?

A: Category A substitutes (SMBJ11A variants, TV06B110J-G) match the original 33A peak pulse current and 600W power rating. Category B substitutes (SMB10J11A variants) provide doubled peak pulse current (54.9A) and power dissipation (1000W) for higher transient energy applications, while maintaining the same voltage specifications.

Q: Is SMBJ10A-TR a suitable replacement for SMBJ11?

A: SMBJ10A-TR operates at 10V reverse standoff versus 11V for SMBJ11, resulting in lower voltage margin. This part is suitable only if circuit design accommodates the reduced standoff voltage and lower 17V clamping voltage. Verify overvoltage protection requirements before selection.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original SMBJ11 compliance profile.

Q: What packaging formats are available for substitutes?

A: All substitutes are supplied in Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel® formats suitable for automated assembly. All maintain DO-214AA (SMB) mechanical package compatibility.

Q: Which substitute offers the widest operating temperature range?

A: SMBJ11A-TP (Micro Commercial Co) operates from -55°C to 175°C, providing 25°C additional upper temperature margin compared to other Category A substitutes rated to 150°C.

Q: Can I use SMB10J11A parts as direct replacements?

A: SMB10J11A-E3/52 and SMB10J11A-E3/5B maintain 11V standoff and 18.2V clamping voltage but provide enhanced current handling (54.9A versus 33A). These are suitable for designs requiring higher transient energy absorption without circuit modification.

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