SMAJ170 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMAJ170 is a unidirectional transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. It features a 170V reverse standoff voltage rating with a 288.75V maximum clamping voltage at peak pulse current. The device is packaged in DO-214AC (SMA) surface mount configuration.

The SMAJ170 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

Substiute Parts

SMAJ170

Littelfuse Inc.In Stock: 12997SMAJ170 Datasheet

Current PartRFQ

SMAJ170A

MDDIn Stock: 45444SMAJ170A Datasheet

DirectRFQ

SMAJ170A

MDDIn Stock: 45444SMAJ170A Datasheet

DirectRFQ

SMAJ170A-13-F

Diodes IncorporatedIn Stock: 50455SMAJ170A-13-F Datasheet

MFR RecommendedRFQ

SMAJ170AE3/TR13

Microchip TechnologyIn Stock: 1045SMAJ170AE3/TR13 Datasheet

MFR RecommendedRFQ

SMAJ170E3/TR13

Microchip TechnologyIn Stock: 945SMAJ170E3/TR13 Datasheet

MFR RecommendedRFQ

TV04A171J-G

Comchip TechnologyIn Stock: 1150TV04A171J-G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMAJ170 is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): Must equal 170V
• Package / Case: Must be DO-214AC (SMA) surface mount
• Type: Must be Zener unidirectional TVS diode
• Unidirectional Channels: Must be 1
• Voltage - Breakdown (Min): Must be within the specified range (179.1V minimum for SMAJ170)
• Voltage - Clamping (Max) @ Ipp: Acceptable range 275V to 304V (substitute parts show variation from original 288.75V)
• Current - Peak Pulse (10/1000µs): Acceptable range 1.4A to 1.8A (substitute parts show variation from original 1.5A)
• Power - Peak Pulse: Acceptable range 400W to 500W
• Operating Temperature Range: Must support -55°C to 150°C minimum
• RoHS Status: Must be ROHS3 Compliant

All identified substitute parts meet these criteria and are classified as active products with current manufacturing status.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts are active products with current manufacturing status, providing reliable supply chain alternatives to the obsolete SMAJ170. Selection among these substitutes should be based on the following factors:

SMAJ170A (MDD): Active status with 45,400 units in stock. Meets core electrical parameters with 275V clamping voltage and 1.50A peak pulse current. Operating temperature range of -50°C to 150°C is suitable for most general-purpose applications. Tape & Reel packaging supports automated assembly.

SMAJ170A-13-F (Diodes Incorporated): Active status with 50,400 units in stock. Manufacturer-recommended substitute with 275V clamping voltage and 1.4A peak pulse current. Operating temperature range of -55°C to 150°C provides extended low-temperature performance. Tape & Reel packaging supports automated assembly.

SMAJ170AE3/TR13 (Microchip Technology): Active status with 973 units in stock. Offers enhanced performance with 1.8A peak pulse current and 500W power rating. Operating temperature range of -65°C to 150°C matches the original SMAJ170. Tape & Reel packaging supports automated assembly.

SMAJ170E3/TR13 (Microchip Technology): Active status with 891 units in stock. Provides highest clamping voltage at 304V with 1.6A peak pulse current and 500W power rating. Operating temperature range of -65°C to 150°C matches the original SMAJ170. Tape & Reel packaging supports automated assembly.

TV04A171J-G (Comchip Technology): Active status with 1,097 units in stock. Meets core electrical parameters with 275V clamping voltage and 1.45A peak pulse current. Operating temperature range of -55°C to 150°C. Tape & Reel packaging supports automated assembly.

All substitute parts are ROHS3 compliant and carry REACH Unaffected or REACH Compliant status where specified.

Frequently Asked Questions (FAQ)

Q: Can SMAJ170A directly replace SMAJ170 in existing designs?

A: SMAJ170A meets the core substitution criteria: identical 170V reverse standoff voltage, DO-214AC (SMA) package, and general-purpose TVS diode classification. The 275V clamping voltage is lower than the original 288.75V, and the operating temperature minimum is -50°C versus -65°C. Verify that your application tolerates these parameter variations before implementation.

Q: What is the difference between SMAJ170AE3/TR13 and SMAJ170E3/TR13?

A: Both are Microchip Technology products with identical 170V reverse standoff voltage and DO-214AC (SMA) packaging. SMAJ170AE3/TR13 provides 275V clamping voltage with 1.8A peak pulse current. SMAJ170E3/TR13 provides 304V clamping voltage with 1.6A peak pulse current. Select based on your circuit's clamping voltage requirement.

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

A: Yes. All identified substitute parts are specified with Tape & Reel (TR) packaging, supporting automated surface mount assembly processes.

Q: Which substitute offers the closest electrical match to SMAJ170?

A: SMAJ170AE3/TR13 (Microchip Technology) provides the closest match with identical -65°C to 150°C operating temperature range and enhanced 500W power rating. However, the 275V clamping voltage is lower than the original 288.75V.

Q: Do all substitutes meet RoHS compliance requirements?

A: Yes. All identified substitute parts are ROHS3 compliant, meeting current environmental and hazardous substance restrictions.

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

A: All parts use DO-214AC (SMA) surface mount package, maintaining mechanical and electrical compatibility with SMAJ170 PCB layouts.