SMAJ10 Equivalent & Substitute Parts

Part Overview

The SMAJ10 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 a 10V reverse standoff voltage with a 17.85V maximum clamping voltage and 24.6A peak pulse current capability in a DO-214AC (SMA) package. The SMAJ10 is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility with the original electrical specifications and package footprint while meeting current availability and compliance standards.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	10	V
Voltage - Breakdown (Min)	10.53	V
Voltage - Clamping (Max) @ Ipp	17.85	V
Current - Peak Pulse (10/1000µs)	24.6	A
Power - Peak Pulse	400	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the SMAJ10 is determined by the following critical parameters:

Primary Compatibility Criteria:

Voltage - Reverse Standoff (Typ): 10V
Voltage - Clamping (Max) @ Ipp: 17.85V maximum (lower values acceptable)
Current - Peak Pulse (10/1000µs): 24.6A minimum
Power - Peak Pulse: 400W minimum
Package / Case: DO-214AC, SMA (mandatory)
Type: Zener, Unidirectional (1 channel)

Secondary Compliance Criteria:

RoHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)
Operating Temperature Range: -65°C to 150°C minimum

Substitute parts are grouped into two categories: direct electrical equivalents (matching clamping voltage and peak pulse current) and functional alternatives (meeting or exceeding electrical performance within the same package). All listed substitutes maintain the same reverse standoff voltage, package footprint, and compliance certifications as the original SMAJ10.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temperature (°C)	Product Status	RoHS Status
SMAJ10	Littelfuse Inc.	10	17.85	24.6	400	-65 to 150	Obsolete	ROHS3 Compliant
SMAJ10A	MDD	10	17	24.6	400	-50 to 150	Active	ROHS3 Compliant
SMAJ10A-13-F	Diodes Incorporated	10	17	24.6	400	-55 to 150	Active	ROHS3 Compliant
SMAJ10A-TP	Micro Commercial Co	10	17	24.6	400	-55 to 175	Active	ROHS3 Compliant
SMAJ10AE3/TR13	Microchip Technology	10	17	29.4	500	-65 to 150	Active	ROHS3 Compliant
SMAJ10E3/TR13	Microchip Technology	10	18.8	26.6	500	-65 to 150	Active	ROHS3 Compliant
SM4T12AY	STMicroelectronics	10	21.7	106 (8/20µs)	400	-55 to 150	Active	ROHS3 Compliant
SMA6J10A-TR	STMicroelectronics	10	19.6	184 (8/20µs)	600	-55 to 175	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Electrical Equivalents (Preferred for Drop-In Replacement):

SMAJ10A (MDD), SMAJ10A-13-F (Diodes Incorporated), and SMAJ10A-TP (Micro Commercial Co) provide direct electrical equivalence with clamping voltages of 17V and peak pulse currents of 24.6A. These parts are active products with full RoHS3 compliance and MSL 1 ratings. SMAJ10A-13-F offers the widest operating temperature range (-55°C to 150°C) and highest inventory availability (100,400 pcs). SMAJ10A-TP extends the upper operating temperature to 175°C, suitable for applications requiring enhanced thermal performance.

Enhanced Performance Alternatives:

SMAJ10AE3/TR13 (Microchip Technology) and SMAJ10E3/TR13 (Microchip Technology) exceed the original specifications with higher peak pulse currents (29.4A and 26.6A respectively) and increased power dissipation (500W). Both maintain the -65°C to 150°C operating range of the original SMAJ10. These parts are suitable for applications requiring additional transient protection margin.

Higher Current Alternatives:

SM4T12AY (STMicroelectronics) and SMA6J10A-TR (STMicroelectronics) provide significantly higher peak pulse current capabilities (106A and 184A respectively, measured at 8/20µs pulse width) with increased power dissipation (400W and 600W). These parts feature higher clamping voltages (21.7V and 19.6V) and are qualified to AEC-Q101 automotive standards. Selection of these alternatives requires verification that the higher clamping voltage is acceptable for the target application.

All substitute parts maintain DO-214AC (SMA) package compatibility, unidirectional Zener diode topology, and RoHS3 compliance with MSL 1 ratings.

Frequently Asked Questions (FAQ)

Q: Can SMAJ10A directly replace SMAJ10 in existing designs?

A: Yes. SMAJ10A maintains the same 10V reverse standoff voltage, 17V clamping voltage, 24.6A peak pulse current, and DO-214AC package footprint. The primary difference is product status (active vs. obsolete) and slightly lower minimum operating temperature (-50°C vs. -65°C for MDD variant). Verify your application's minimum temperature requirement before selection.

Q: What is the difference between SMAJ10AE3/TR13 and SMAJ10E3/TR13?

A: Both are Microchip Technology products with identical reverse standoff voltage (10V) and operating temperature range (-65°C to 150°C). SMAJ10AE3/TR13 has a 17V clamping voltage with 29.4A peak pulse current and 500W power dissipation. SMAJ10E3/TR13 has an 18.8V clamping voltage with 26.6A peak pulse current and 500W power dissipation. Selection depends on whether the lower clamping voltage (17V) or higher current capability (29.4A) is required for your application.

Q: Why do SM4T12AY and SMA6J10A-TR have different peak pulse current specifications?

A: These parts use different pulse width standards. SM4T12AY specifies 106A at 8/20µs pulse width, while SMA6J10A-TR specifies 184A at 8/20µs pulse width. Both maintain the same 10V reverse standoff voltage and DO-214AC package. The higher clamping voltages (21.7V and 19.6V respectively) indicate different protection characteristics. Confirm that the higher clamping voltage is compatible with your circuit protection requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings, matching the original SMAJ10 compliance profile.

Q: What packaging options are available for substitute parts?

A: All substitute parts are supplied in DO-214AC (SMA) surface-mount package, maintaining footprint compatibility with the original SMAJ10. Packaging formats vary by manufacturer: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, or standard reel configurations. Verify packaging requirements with your procurement process.

Q: Can I use SMA6J10A-TR or SM4T12AY as direct replacements?

A: These parts are functional alternatives, not direct replacements. Both maintain the 10V reverse standoff voltage and DO-214AC package but feature higher clamping voltages (19.6V and 21.7V respectively) and significantly higher peak pulse currents. Use these parts only if your application can tolerate the higher clamping voltage and benefits from the enhanced current handling capability.

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