SMLJ11A Equivalent & Substitute Parts

Part Overview

The SMLJ11A is a unidirectional transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features an 11V reverse standoff voltage with an 18.2V maximum clamping voltage and 164.8A peak pulse current capability at 3000W power dissipation. The part is RoHS3 compliant, active in production status, and packaged in the DO-214AB (SMC) form factor. Equivalent and substitute parts are identified based on matching or closely aligned electrical characteristics and mechanical compatibility within the TVS diode category.

Key Parameters

Parameter	SMLJ11A
Manufacturer	Bourns Inc.
Type	Zener TVS Diode
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	11V
Voltage - Breakdown (Min)	12.2V
Voltage - Clamping (Max) @ Ipp	18.2V
Current - Peak Pulse (10/1000µs)	164.8A
Power - Peak Pulse	3000W
Package / Case	DO-214AB, SMC
Operating Temperature	-55°C ~ 150°C (TJ)
RoHS Status	RoHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the SMLJ11A are classified into two categories based on electrical parameter alignment:

Direct Equivalent (Electrical Match): Parts with identical or near-identical reverse standoff voltage (11V), breakdown voltage (12.2V), clamping voltage (18.2V), and peak pulse current (164.8A ±1%) at 3000W power dissipation. These parts maintain full functional interchangeability.

Similar Substitutes (Parameter Tolerance): Parts with reverse standoff voltages within ±1V of the main part (10V–12V range), clamping voltages between 16.7V–19.9V, and peak pulse currents between 82.5A–176.5A. These parts operate within acceptable tolerance bands for general-purpose TVS applications but may have different power ratings (1500W or 3000W). All substitute parts maintain the DO-214AB (SMC) package form factor and surface-mount mounting type.

Key Parameters for Substitution:

Reverse Standoff Voltage: 11V ±1V
Clamping Voltage: 18.2V ±2V
Package: DO-214AB (SMC)
Mounting Type: Surface Mount
Unidirectional Configuration: 1 Channel

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown (V)	Clamping (V)	Peak Pulse Current (A)	Power (W)	Package	Status
SMLJ11A	Bourns Inc.	11	12.2	18.2	164.8	3000	DO-214AB	Active
SMDJ11A	Alpha & Omega Semiconductor Inc.	11	12.2	18.2	164.9	3000	DO-214AB	Active
TPSMD11A	Littelfuse Inc.	11	12.2	18.2	164.8	3000	DO-214AB	Active
SMCJ11A	Fairchild Semiconductor / Micro Commercial Co	11	12.2	18.2	82.5	1500	DO-214AB	Active
SMCJ11A-TP	Micro Commercial Co	11	12.2	18.2	82.5	1500	DO-214AB	Active
TPSMC13A	Littelfuse Inc.	11.1	12.4	18.2	84.6	1500	DO-214AB	Active
1.5SMC13A	Taiwan Semiconductor Corporation	11.1	12.4	18.2	86	1500	DO-214AB	Active
TPSMD10A	Littelfuse Inc.	10	11.1	17	176.5	3000	DO-214AB	Active
TPSMD12A	Littelfuse Inc.	12	13.3	19.9	150.8	3000	DO-214AB	Active
TPSMC12A	Littelfuse	10.2	11.4	16.7	91	1500	DO-214AB	Active

Engineering Selection Recommendations

Direct Equivalents (Preferred for 1:1 Replacement):

SMDJ11A and TPSMD11A are direct electrical equivalents to the SMLJ11A, matching all critical parameters including reverse standoff voltage (11V), clamping voltage (18.2V), peak pulse current (164.8A–164.9A), and 3000W power dissipation. Both parts are RoHS3 compliant and active in production. TPSMD11A carries AEC-Q101 automotive qualification, making it suitable for automotive-grade applications. SMDJ11A is suitable for general-purpose applications without automotive requirements.

Acceptable Substitutes (Voltage/Current Tolerance Range):

SMCJ11A, SMCJ11A-TP, TPSMC13A, and 1.5SMC13A maintain the 11V–11.1V reverse standoff voltage and 18.2V clamping voltage but operate at reduced peak pulse current (82.5A–86A) and 1500W power dissipation. These parts are suitable for applications where peak pulse current requirements do not exceed 86A. TPSMC13A carries AEC-Q101 automotive qualification.

Lower Voltage Standoff Alternatives:

TPSMD10A operates at 10V reverse standoff with 17V clamping voltage and 176.5A peak pulse current at 3000W. This part is suitable for lower-voltage protection circuits and carries AEC-Q101 automotive qualification.

Higher Voltage Standoff Alternatives:

TPSMD12A operates at 12V reverse standoff with 19.9V clamping voltage and 150.8A peak pulse current at 3000W. This part is suitable for higher-voltage protection circuits and carries AEC-Q101 automotive qualification.

All substitute parts maintain DO-214AB (SMC) package compatibility and surface-mount configuration. Selection should be based on specific circuit voltage requirements, peak pulse current demands, and power dissipation constraints.

Frequently Asked Questions (FAQ)

Q: Can SMDJ11A directly replace SMLJ11A?

A: Yes. SMDJ11A is a direct electrical equivalent with identical reverse standoff voltage (11V), breakdown voltage (12.2V), clamping voltage (18.2V), peak pulse current (164.9A), and 3000W power dissipation. Both use DO-214AB packaging and are RoHS3 compliant.

Q: What is the difference between SMLJ11A and SMCJ11A?

A: Both parts share the same 11V reverse standoff and 18.2V clamping voltage. The primary difference is peak pulse current: SMLJ11A handles 164.8A at 3000W, while SMCJ11A handles 82.5A at 1500W. SMCJ11A is suitable only for applications with lower current transient requirements.

Q: Are TPSMD series parts compatible with SMLJ11A?

A: TPSMD11A is a direct equivalent to SMLJ11A with identical electrical specifications and 3000W power rating. TPSMD10A and TPSMD12A have different voltage ratings (10V and 12V respectively) and are suitable only for circuits designed for those specific voltage levels. All TPSMD parts carry AEC-Q101 automotive qualification.

Q: Can I use a 1500W part instead of a 3000W part?

A: Only if your circuit's peak pulse current does not exceed the lower-rated part's specification. SMCJ11A and TPSMC13A are rated for 82.5A–84.6A peak pulse current at 1500W. If your application requires 164.8A peak pulse current, a 3000W-rated part (SMLJ11A, SMDJ11A, or TPSMD11A) is required.

Q: Do all substitute parts use the same DO-214AB package?

A: Yes. All listed substitute parts use the DO-214AB (SMC) surface-mount package, ensuring mechanical and footprint compatibility with the SMLJ11A.

Q: Which substitute parts have automotive qualification?

A: TPSMD11A, TPSMD10A, TPSMD12A, and TPSMC13A carry AEC-Q101 automotive qualification. These parts are suitable for automotive-grade applications requiring formal qualification documentation.

Q: What is the operating temperature range for substitute parts?

A: Most parts operate from -55°C to 150°C (TJ). SMCJ11A-TP extends to -55°C to 175°C (TJ), and TPSMD series parts operate from -65°C to 150°C (TJ). Verify temperature requirements for your specific application.

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