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SMAJ54C Equivalent & Substitute Parts
Part Overview
The SMAJ54C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 54V reverse standoff voltage with a 91.46V maximum clamping voltage and 4.6A peak pulse current capability in a DO-214AC (SMA) package. The SMAJ54C is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Reverse Standoff Voltage (Typ) | 54V |
| Breakdown Voltage (Min) | 56.84V |
| Clamping Voltage (Max) @ Ipp | 91.46V |
| Peak Pulse Current (10/1000µs) | 4.6A |
| Peak Pulse Power | 400W |
| Package Type | DO-214AC (SMA) |
| Operating Temperature Range | -65°C to 150°C (TJ) |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitute parts for the SMAJ54C are qualified based on the following critical parameters:
- Reverse Standoff Voltage: 54V (all substitutes maintain this specification)
- Package Type: DO-214AC (SMA) surface mount (mechanical and electrical compatibility requirement)
- Bidirectional Channels: 1 (functional equivalence)
- Type: Zener TVS diode (functional category)
- RoHS Compliance: ROHS3 Compliant (regulatory requirement)
- Clamping Voltage Range: 87.1V to 96.3V (acceptable variation within circuit protection parameters)
- Peak Pulse Current: 4.59A to 5.7A (acceptable variation for general-purpose applications)
Substitutes are grouped into two categories based on clamping voltage performance: standard clamping (87.1V) and enhanced clamping (96.3V).
Parameter Comparison
| Part Number | Manufacturer | Status | Reverse Standoff (V) | Breakdown Min (V) | Clamping Max @ Ipp (V) | Peak Pulse Current (A) | Peak Pulse Power (W) | Temp Range (°C) | Package |
|---|---|---|---|---|---|---|---|---|---|
| SMAJ54C | Littelfuse | Obsolete | 54 | 56.84 | 91.46 | 4.6 | 400 | -65 to 150 | DO-214AC (SMA) |
| SMAJ54CA | Meritek | Active | 54 | 60 | 87.1 | 4.59 | 400 | -55 to 150 | DO-214AC (SMA) |
| SMAJ54CA-13-F | Diodes Incorporated | Active | 54 | 60 | 87.1 | 4.6 | 400 | -55 to 150 | DO-214AC (SMA) |
| SMAJ54CA-TP | Micro Commercial Co | Active | 54 | 60 | 87.1 | 4.6 | 400 | -55 to 175 | DO-214AC (SMA) |
| SMAJ54CAE3/TR13 | Microchip Technology | Active | 54 | 60 | 87.1 | 5.7 | 500 | -65 to 150 | DO-214AC (SMA) |
| SMAJ54CE3/TR13 | Microchip Technology | Active | 54 | 60 | 96.3 | 5.2 | 500 | -65 to 150 | DO-214AC (SMA) |
| TV04A540JB-G | Comchip Technology | Active | 54 | 60 | 87.1 | 4.59 | 400 | -55 to 150 | DO-214AC (SMA) |
Engineering Selection Recommendations
All substitute parts listed are active products with ROHS3 compliance and REACH unaffected status, ensuring regulatory compliance and long-term availability.
For direct replacement with minimal performance variation: SMAJ54CA-13-F (Diodes Incorporated) or SMAJ54CA-TP (Micro Commercial Co) provide equivalent electrical characteristics with active product status and extended temperature range support (-55°C to 175°C for SMAJ54CA-TP).
For enhanced pulse handling capability: SMAJ54CAE3/TR13 (Microchip Technology) offers increased peak pulse current (5.7A) and power dissipation (500W) while maintaining the original temperature range (-65°C to 150°C), suitable for applications requiring higher transient energy absorption.
For higher clamping voltage applications: SMAJ54CE3/TR13 (Microchip Technology) provides 96.3V maximum clamping voltage with 5.2A peak pulse current and 500W power rating, appropriate for circuits requiring tighter voltage suppression.
Frequently Asked Questions (FAQ)
Q: Can SMAJ54CA be used as a direct replacement for SMAJ54C?
A: Yes. Both parts maintain 54V reverse standoff voltage, identical package type (DO-214AC/SMA), and equivalent clamping voltage performance (87.1V vs. 91.46V). The primary difference is the lower minimum operating temperature (-55°C vs. -65°C). Verify circuit requirements for the lower temperature limit.
Q: What is the difference between SMAJ54CAE3/TR13 and SMAJ54CE3/TR13?
A: Both are Microchip Technology products with identical reverse standoff voltage (54V) and package type. SMAJ54CAE3/TR13 provides 87.1V clamping with 5.7A peak current, while SMAJ54CE3/TR13 provides 96.3V clamping with 5.2A peak current. Select based on required clamping voltage specification for your circuit.
Q: Are all substitute parts available in tape and reel packaging?
A: Yes. All listed substitute parts are supplied in tape and reel (TR) format, suitable for automated assembly processes.
Q: Do substitute parts meet the same compliance standards as SMAJ54C?
A: All substitute parts are ROHS3 compliant and REACH unaffected. Moisture sensitivity level is 1 (Unlimited) for all parts, matching the original specification.
Q: Which substitute offers the best thermal performance?
A: SMAJ54CA-TP (Micro Commercial Co) supports the highest operating temperature range (-55°C to 175°C), providing extended thermal margin for high-temperature applications.
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