SMAJ75 Equivalent & Substitute Parts

Part Overview

The SMAJ75 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 75V reverse standoff voltage with a 127.05V maximum clamping voltage and 3.3A peak pulse current capability in a DO-214AC (SMA) package. The SMAJ75 is currently listed as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

SMAJ75

Littelfuse Inc.In Stock: 769SMAJ75 Datasheet

Current PartRFQ

SMAJ75A

MDDIn Stock: 37444SMAJ75A Datasheet

DirectRFQ

SMAJ75A

MDDIn Stock: 37444SMAJ75A Datasheet

DirectRFQ

SMAJ75A-13-F

Diodes IncorporatedIn Stock: 18084SMAJ75A-13-F Datasheet

MFR RecommendedRFQ

SMAJ75A-TP

Micro Commercial CoIn Stock: 5826SMAJ75A-TP Datasheet

MFR RecommendedRFQ

SMAJ75AE3/TR13

Microchip TechnologyIn Stock: 808SMAJ75AE3/TR13 Datasheet

MFR RecommendedRFQ

SMAJ75E3/TR13

Microchip TechnologyIn Stock: 1028SMAJ75E3/TR13 Datasheet

MFR RecommendedRFQ

TV04A750J-G

Comchip TechnologyIn Stock: 980TV04A750J-G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMAJ75 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• Voltage - Reverse Standoff (Typ): 75V
• Unidirectional Channels: 1
• Package / Case: DO-214AC, SMA
• Type: Zener
• RoHS Status: ROHS3 Compliant
• Mounting Type: Surface Mount

Allowable Variation Parameters:

• Voltage - Clamping (Max) @ Ipp: 121V to 134V (within acceptable transient suppression range)
• Current - Peak Pulse (10/1000µs): 3.3A to 4.1A (higher current capability acceptable)
• Power - Peak Pulse: 400W to 500W (higher power rating acceptable)
• Operating Temperature Range: -65°C to -50°C minimum; 150°C to 175°C maximum (extended ranges acceptable)

All substitute parts maintain the core 75V standoff voltage specification and identical package form factor, ensuring direct mechanical and electrical compatibility in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity ratings, ensuring regulatory compliance and manufacturing compatibility with current supply chains.

SMAJ75A (MDD) and TV04A750J-G (Comchip) provide direct electrical equivalence with clamping voltages of 121V and peak pulse currents of 3.3A to 3.31A, matching the original SMAJ75 performance envelope.

SMAJ75A-13-F (Diodes Incorporated) offers identical electrical specifications with extended temperature range support (-55°C minimum) and Tape & Reel packaging, suitable for high-volume automated assembly.

SMAJ75A-TP (Micro Commercial Co) extends the maximum operating temperature to 175°C, providing thermal margin for applications with elevated ambient conditions.

SMAJ75AE3/TR13 (Microchip) and SMAJ75E3/TR13 (Microchip) provide enhanced current handling (4.1A and 3.7A respectively) and increased power dissipation (500W), suitable for applications requiring additional transient energy absorption capacity. The SMAJ75E3/TR13 variant offers higher clamping voltage (134V) for circuits with stricter voltage suppression requirements.

Selection should prioritize active products with established supply availability and manufacturing certifications matching your production requirements.

Frequently Asked Questions (FAQ)

Q: Can SMAJ75A substitute directly for SMAJ75 in existing designs?

A: Yes. The SMAJ75A maintains the 75V reverse standoff voltage, identical DO-214AC (SMA) package, and equivalent peak pulse current (3.3A). The clamping voltage difference (121V vs. 127.05V) falls within acceptable transient suppression tolerances for general-purpose applications.

Q: What is the difference between SMAJ75AE3/TR13 and SMAJ75E3/TR13?

A: Both are Microchip products with identical 75V standoff voltage and DO-214AC packaging. The SMAJ75AE3/TR13 provides 4.1A peak pulse current and 121V clamping voltage, while the SMAJ75E3/TR13 provides 3.7A peak pulse current and 134V clamping voltage. Selection depends on whether your circuit prioritizes current handling capacity or lower clamping voltage.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Yes. SMAJ75A-13-F, SMAJ75A-TP, SMAJ75AE3/TR13, SMAJ75E3/TR13, and TV04A750J-G are all supplied in Tape & Reel (TR) packaging suitable for automated pick-and-place assembly. SMAJ75A (MDD) availability in specific packaging should be confirmed with the supplier.

Q: Which substitute offers the widest operating temperature range?

A: SMAJ75A-TP (Micro Commercial Co) extends to 175°C maximum operating temperature, compared to 150°C for most alternatives. This provides additional thermal margin for high-temperature environments.

Q: Do all substitutes meet RoHS3 compliance?

A: Yes. All listed substitute parts are ROHS3 Compliant with MSL 1 (Unlimited) moisture sensitivity ratings, meeting current regulatory requirements for electronics manufacturing.

Q: Can I use SMAJ75AE3/TR13 or SMAJ75E3/TR13 in place of standard SMAJ75A?

A: Yes, with consideration for your specific application. Both Microchip variants maintain the 75V standoff voltage and identical package. The enhanced current and power ratings (500W vs. 400W) provide additional transient suppression capacity without compromising circuit compatibility. Verify that the clamping voltage (121V or 134V) aligns with your circuit protection requirements.