SMAJ58AE3/TR13 Equivalent & Substitute Parts

Part Overview

The SMAJ58AE3/TR13 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection applications. This surface-mount component operates with a 58V reverse standoff voltage and provides 93.6V maximum clamping voltage at peak pulse current. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating.

Equivalent and substitute parts are identified based on matching electrical characteristics within the allowed parameter tolerances for TVS diodes in the DO-214AC (SMA) package category. Substitutes maintain the same reverse standoff voltage (58V), breakdown voltage range (64.4V minimum), and clamping voltage specification (93.6V) to ensure functional compatibility in circuit protection applications.

Key Parameters

Parameter	Value	Unit
Reverse Standoff Voltage (Typ)	58	V
Breakdown Voltage (Min)	64.4	V
Clamping Voltage (Max) @ Ipp	93.6	V
Peak Pulse Current (10/1000µs)	5.3	A
Peak Pulse Power	500	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package Type	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SMAJ58AE3/TR13 are classified into two functional groups based on electrical parameter alignment:

Group 1: Direct Electrical Equivalents (93.6V Clamping) These parts maintain identical reverse standoff voltage (58V), breakdown voltage (64.4V minimum), and clamping voltage (93.6V maximum). Peak pulse current ratings range from 4.3A to 5.3A. These substitutes are functionally interchangeable in applications where the original specification is required.

Parts in this group:

SMAJ58A (MDD)
SMAJ58A-13-F (Diodes Incorporated)
SMAJ58A-TR (STMicroelectronics)
SZ1SMA58AT3G (Littelfuse)

Group 2: Higher Performance Alternatives (100V–121V Clamping) These parts maintain the same 58V reverse standoff and 64.4V breakdown voltage but provide higher clamping voltage ratings (100V or 121V) and increased peak pulse current capacity (19A or 33A). These are suitable for applications requiring enhanced transient suppression capability.

Parts in this group:

SM4T68AY (STMicroelectronics) – 121V clamping, 19A peak pulse
SMA6J58A-TR (STMicroelectronics) – 100V clamping, 33A peak pulse

All substitute parts are packaged in DO-214AC (SMA) surface-mount format and maintain ROHS3 compliance with unlimited moisture sensitivity rating (MSL 1).

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Operating Temp (°C)	Package
SMAJ58AE3/TR13	Microchip Technology	58	64.4	93.6	5.3	500	-65 to 150	DO-214AC, SMA
SMAJ58A	MDD	58	64.4	93.6	4.3	400	-50 to 150	DO-214AC, SMA
SMAJ58A-13-F	Diodes Incorporated	58	64.4	93.6	4.3	400	-55 to 150	DO-214AC, SMA
SMAJ58A-TR	STMicroelectronics	58	64.4	93.6	4.3	400	-55 to 150	DO-214AC, SMA
SZ1SMA58AT3G	Littelfuse	58	64.4	93.6	4.3	400	-65 to 150	DO-214AC, SMA
SM4T68AY	STMicroelectronics	58	64.4	121	19 (8/20µs)	400	-55 to 150	DO-214AC, SMA
SMA6J58A-TR	STMicroelectronics	58	64.4	100	33 (8/20µs)	600	-55 to 175	DO-214AC, SMA

Engineering Selection Recommendations

For Direct Replacement (Group 1 Equivalents)

When the application requires exact electrical specifications matching the SMAJ58AE3/TR13, select from Group 1 substitutes. All Group 1 parts maintain 93.6V clamping voltage and are ROHS3 compliant with active product status.

SMAJ58A-TR (STMicroelectronics): Recommended for high-volume applications. TRANSIL™ series designation indicates automotive-grade qualification (AEC-Q101). Operating temperature range -55°C to 150°C. 25,660 units in stock.
SZ1SMA58AT3G (Littelfuse): Recommended for automotive and extended temperature applications. AEC-Q101 qualified with operating range -65°C to 150°C matching the original part. Capacitance specification provided (225pF @ 1MHz). 15,200 units in stock.
SMAJ58A-13-F (Diodes Incorporated): Recommended for general-purpose applications with high availability. Operating range -55°C to 150°C. Largest inventory (280,857 units).

For Enhanced Performance (Group 2 Alternatives)

When the application permits higher clamping voltage and increased current handling:

SMA6J58A-TR (STMicroelectronics): Provides 100V clamping with 33A peak pulse current and 600W peak power. Extended operating temperature to 175°C. Highest inventory availability (30,400 units). Suitable for applications requiring greater transient suppression margin.
SM4T68AY (STMicroelectronics): Provides 121V clamping with 19A peak pulse current. AEC-Q101 automotive qualification. Suitable for high-energy transient environments.

All recommended substitutes maintain DO-214AC (SMA) package compatibility, ROHS3 compliance, and unlimited moisture sensitivity rating (MSL 1).

Frequently Asked Questions (FAQ)

Q: Can SMAJ58A-TR be used as a direct replacement for SMAJ58AE3/TR13?

A: Yes. Both parts maintain identical reverse standoff voltage (58V), breakdown voltage (64.4V minimum), and clamping voltage (93.6V maximum). The SMAJ58A-TR is TRANSIL™ series with AEC-Q101 automotive qualification and operates across -55°C to 150°C. The primary difference is the operating temperature lower limit (-55°C versus -65°C for the original part). For applications not requiring the extended -65°C minimum, this substitution is functionally equivalent.

Q: What is the difference between Group 1 and Group 2 substitutes?

A: Group 1 substitutes (SMAJ58A variants and SZ1SMA58AT3G) maintain the exact 93.6V clamping voltage specification of the original part. Group 2 substitutes (SM4T68AY and SMA6J58A-TR) provide higher clamping voltages (100V–121V) and increased peak pulse current ratings (19A–33A). Group 2 parts are suitable when the application can tolerate higher clamping voltage and requires greater transient energy absorption capability.

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

A: Yes. All substitute parts listed are packaged in DO-214AC (SMA) surface-mount format, ensuring mechanical and electrical compatibility with the original SMAJ58AE3/TR13 footprint. Packaging options vary (Tape & Reel, Cut Tape, Digi-Reel®), but the component package type remains consistent.

Q: Which substitute part has the widest operating temperature range?

A: The SZ1SMA58AT3G (Littelfuse) and SMAJ58AE3/TR13 (original) both operate across -65°C to 150°C. The SMA6J58A-TR extends the upper limit to 175°C. For applications requiring the full -65°C to 150°C range with direct electrical equivalence, SZ1SMA58AT3G is the appropriate selection.

Q: Do all substitutes meet RoHS compliance?

A: Yes. All listed substitute parts are ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1), matching the original part's compliance status.

Q: What is the peak pulse current measurement standard for Group 2 parts?

A: Group 2 parts (SM4T68AY and SMA6J58A-TR) specify peak pulse current using the 8/20µs waveform standard, whereas the original SMAJ58AE3/TR13 uses the 10/1000µs standard. These represent different transient pulse profiles. The 8/20µs waveform is commonly used for lightning and surge testing, while 10/1000µs represents ESD-type transients. Selection between these standards depends on the specific transient environment of the application.

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