SMAJ14 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMAJ14 is a unidirectional transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 14V reverse standoff voltage with a 24.36V maximum clamping voltage and 17.2A peak pulse current capability in a DO-214AC (SMA) package. The SMAJ14 is classified as obsolete; equivalent and substitute parts from active manufacturers are available to maintain design continuity and ensure supply chain reliability.

Substiute Parts

SMAJ14

Littelfuse Inc.In Stock: 84127SMAJ14 Datasheet

Current PartRFQ

SMAJ14A

Good-Ark SemiconductorIn Stock: 65384SMAJ14A Datasheet

DirectRFQ

SMAJ14A

Good-Ark SemiconductorIn Stock: 65384SMAJ14A Datasheet

DirectRFQ

SMAJ14A-13-F

Diodes IncorporatedIn Stock: 10140SMAJ14A-13-F Datasheet

MFR RecommendedRFQ

SMAJ14A-TP

Micro Commercial CoIn Stock: 34237SMAJ14A-TP Datasheet

MFR RecommendedRFQ

SMAJ14AE3/TR13

Microchip TechnologyIn Stock: 943SMAJ14AE3/TR13 Datasheet

MFR RecommendedRFQ

SMAJ14E3/TR13

Microchip TechnologyIn Stock: 1214SMAJ14E3/TR13 Datasheet

MFR RecommendedRFQ

TV04A140J-G

Comchip TechnologyIn Stock: 883TV04A140J-G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMAJ14 is determined by the following critical parameters:

• Reverse Standoff Voltage (Typ): 14V (exact match required)
• Breakdown Voltage (Min): 14.76V minimum
• Clamping Voltage (Max) @ Ipp: 24.36V maximum (tolerance range: 23.2V to 25.8V acceptable)
• Peak Pulse Current (10/1000µs): 17.2A minimum
• Power - Peak Pulse: 400W minimum
• Package / Case: DO-214AC (SMA) surface mount
• Type: Zener, unidirectional
• Compliance: ROHS3 compliant, MSL 1

All substitute parts listed maintain the same reverse standoff voltage, package configuration, and general-purpose application profile. Variations in clamping voltage and peak pulse current within the specified ranges do not affect functional compatibility in standard overvoltage protection circuits.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance and MSL 1 rating, ensuring regulatory alignment and manufacturing availability. Selection among substitutes should prioritize:

Primary Substitutes (Closest Electrical Match):

• SMAJ14A (Good-Ark Semiconductor): Identical electrical specifications to SMAJ14 with active product status and established supply chain.
• SMAJ14A-13-F (Diodes Incorporated): Manufacturer-recommended equivalent with active status and consistent performance parameters.
• TV04A140J-G (Comchip Technology): Cross-manufacturer alternative with matching electrical characteristics and active availability.

Enhanced Performance Alternatives:

• SMAJ14AE3/TR13 (Microchip Technology): Offers increased peak pulse current (21.5A) and power dissipation (500W) while maintaining 14V standoff voltage, suitable for applications requiring higher transient energy absorption.
• SMAJ14E3/TR13 (Microchip Technology): Provides higher clamping voltage (25.8V) and enhanced power rating (500W) for circuits with relaxed clamping requirements.

Extended Temperature Range Option:

• SMAJ14A-TP (Micro Commercial Co): Extends upper operating temperature to 175°C (TA), applicable to high-temperature environments.

All substitutes maintain DO-214AC (SMA) package compatibility, ensuring direct PCB footprint interchangeability without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can SMAJ14A directly replace SMAJ14 without circuit modification?

A: Yes. SMAJ14A maintains identical reverse standoff voltage (14V), peak pulse current (17.2A), and power dissipation (400W) specifications. The clamping voltage is 23.2V versus 24.36V on the original, which remains within acceptable tolerance for general-purpose overvoltage protection. DO-214AC package compatibility ensures direct PCB substitution.

Q: What is the difference between SMAJ14AE3/TR13 and SMAJ14E3/TR13?

A: Both are Microchip Technology products with enhanced power ratings (500W). SMAJ14AE3/TR13 maintains the 23.2V clamping voltage with 21.5A peak pulse current. SMAJ14E3/TR13 increases clamping voltage to 25.8V with 19.4A peak pulse current. Selection depends on circuit clamping voltage tolerance requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification and MSL 1 rating, meeting environmental and moisture sensitivity requirements equivalent to the original SMAJ14.

Q: Does operating temperature range affect substitution suitability?

A: Operating temperature range does not affect functional substitution for standard applications. SMAJ14A-TP extends the upper temperature limit to 175°C (TA), beneficial for high-temperature environments. Most alternatives operate within -55°C to 150°C (TJ), which covers typical industrial and commercial applications.

Q: Can TV04A140J-G be used as a cross-manufacturer substitute?

A: Yes. TV04A140J-G (Comchip Technology) provides equivalent electrical performance with 14V standoff voltage, 23.2V clamping voltage, and 17.24A peak pulse current. The DO-214AC package ensures mechanical compatibility. Cross-manufacturer substitution is valid for general-purpose overvoltage protection applications.

Q: What packaging options are available for substitute parts?

A: All substitute parts are supplied in DO-214AC (SMA) surface-mount package. Packaging formats vary by manufacturer: Cut Tape (CT) & Digi-Reel®, or Tape & Reel (TR). Packaging format does not affect electrical performance or PCB compatibility.