SMAJ11 Equivalent & Substitute Parts

Part Overview

The SMAJ11 is a unidirectional 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 a 19.11V maximum clamping voltage at peak pulse current of 22A, packaged in the DO-214AC (SMA) form factor. The SMAJ11 is classified as obsolete, necessitating identification of active substitute components that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	11	V
Voltage - Breakdown (Min)	11.57	V
Voltage - Clamping (Max) @ Ipp	19.11	V
Current - Peak Pulse (10/1000µs)	22	A
Power - Peak Pulse	400	W
Operating Temperature Range	-65°C to 150°C	TJ
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SMAJ11 is determined by strict adherence to the following electrical and mechanical parameters:

Reverse Standoff Voltage: 11V (all substitutes maintain this specification)
Package / Case: DO-214AC (SMA) form factor (all substitutes use identical packaging)
Mounting Type: Surface Mount (all substitutes are surface-mount compatible)
Unidirectional Configuration: Single channel (all substitutes maintain unidirectional topology)
Type: Zener diode (all substitutes are Zener-type TVS devices)
Applications: General Purpose (all substitutes support general-purpose overvoltage protection)
Compliance: ROHS3 Compliant (all substitutes meet RoHS3 requirements)

Substitute parts are grouped based on clamping voltage and peak pulse current characteristics, which may vary within acceptable ranges while maintaining the core 11V standoff voltage and DO-214AC package specification.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status	Package / Case
SMAJ11	Littelfuse Inc.	11V	11.57V	19.11V	22A	400W	-65°C to 150°C	Obsolete	DO-214AC, SMA
SMAJ11A	Meritek	11V	12.2V	18.2V	21.98A	400W	-55°C to 150°C	Active	DO-214AC, SMA
SMAJ11A-13-F	Diodes Incorporated	11V	12.2V	18.2V	22A	400W	-55°C to 150°C	Active	DO-214AC, SMA
SMAJ11AE3/TR13	Microchip Technology	11V	12.2V	18.2V	27.4A	500W	-65°C to 150°C	Active	DO-214AC, SMA
SMAJ11E3/TR13	Microchip Technology	11V	12.2V	20.1V	24.9A	500W	-65°C to 150°C	Active	DO-214AC, SMA
TV04A110J-G	Comchip Technology	11V	12.2V	18.2V	21.98A	400W	-55°C to 150°C	Active	DO-214AC, SMA

Engineering Selection Recommendations

All identified substitute parts maintain active product status and ROHS3 compliance, ensuring long-term availability and regulatory conformance. Selection among substitutes should be based on the following criteria derived from provided specifications:

SMAJ11A (Meritek) and TV04A110J-G (Comchip Technology) provide direct electrical equivalence with clamping voltage of 18.2V and peak pulse current of 21.98A, matching the original SMAJ11 performance envelope within acceptable tolerance ranges.

SMAJ11A-13-F (Diodes Incorporated) offers identical clamping voltage (18.2V) with peak pulse current of 22A, providing the closest match to the original 22A specification while maintaining 400W peak pulse power rating.

SMAJ11AE3/TR13 (Microchip Technology) and SMAJ11E3/TR13 (Microchip Technology) provide enhanced performance characteristics with increased peak pulse current (27.4A and 24.9A respectively) and 500W peak pulse power rating. SMAJ11AE3/TR13 maintains the original -65°C to 150°C operating temperature range, while SMAJ11E3/TR13 exhibits slightly elevated clamping voltage (20.1V).

All substitutes are packaged in DO-214AC (SMA) form factor and are surface-mount compatible with existing PCB layouts designed for the SMAJ11.

Frequently Asked Questions (FAQ)

Q: Can SMAJ11A be used as a direct replacement for SMAJ11?

A: Yes. SMAJ11A maintains the 11V reverse standoff voltage, DO-214AC (SMA) package, and general-purpose application profile. The clamping voltage is 18.2V (versus 19.11V) and peak pulse current is 21.98A (versus 22A), both within acceptable substitution parameters for TVS diode applications.

Q: What is the difference between SMAJ11AE3/TR13 and SMAJ11E3/TR13?

A: Both are Microchip Technology products with identical 11V standoff voltage and DO-214AC packaging. SMAJ11AE3/TR13 provides 18.2V clamping voltage with 27.4A peak pulse current and 500W power rating. SMAJ11E3/TR13 provides 20.1V clamping voltage with 24.9A peak pulse current and 500W power rating. Selection depends on circuit clamping voltage requirements.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All identified substitute parts are ROHS3 compliant, meeting regulatory requirements for new designs and production applications.

Q: Does operating temperature range affect substitution compatibility?

A: The SMAJ11 operates from -65°C to 150°C. Meritek SMAJ11A and Comchip TV04A110J-G operate from -55°C to 150°C, representing a reduced lower temperature limit. Microchip SMAJ11AE3/TR13 and SMAJ11E3/TR13 maintain the -65°C to 150°C range. Selection should account for application temperature requirements.

Q: Can substitutes be used interchangeably on existing PCBs?

A: Yes. All substitutes use the DO-214AC (SMA) package and are surface-mount compatible. No PCB layout modifications are required for mechanical compatibility. Electrical performance variations should be evaluated against circuit protection requirements.

Q: What is the packaging format for these TVS diodes?

A: All parts, including the original SMAJ11 and all substitutes, are supplied in DO-214AC (SMA) surface-mount package. Tape & Reel (TR) packaging is available for production quantities.

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