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SMAJ48C Equivalent & Substitute Parts
Part Overview
The SMAJ48C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 48V reverse standoff voltage, 81.27V maximum clamping voltage, and 5.2A peak pulse current capability in a DO-214AC (SMA) package. The SMAJ48C is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | SMAJ48C |
| Manufacturer | Littelfuse Inc. |
| Category | Transient Voltage Suppressors (TVS) |
| Type | Zener |
| Package / Case | DO-214AC, SMA |
| Voltage - Reverse Standoff (Typ) | 48V |
| Voltage - Breakdown (Min) | 50.49V |
| Voltage - Clamping (Max) @ Ipp | 81.27V |
| Current - Peak Pulse (10/1000µs) | 5.2A |
| Power - Peak Pulse | 400W |
| Operating Temperature | -65°C ~ 150°C (TJ) |
| Bidirectional Channels | 1 |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitute parts for the SMAJ48C are selected based on the following critical parameters that determine functional equivalence:
Primary Matching Criteria:
- Voltage - Reverse Standoff (Typ): 48V
- Package / Case: DO-214AC, SMA
- Bidirectional Channels: 1
- Type: Zener
- Mounting Type: Surface Mount
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level (MSL): 1 (Unlimited)
Secondary Compatibility Parameters:
- Current - Peak Pulse (10/1000µs): 5.2A or higher
- Power - Peak Pulse: 400W or higher
- Voltage - Clamping (Max) @ Ipp: Within acceptable range for application
- Operating Temperature Range: Must encompass application requirements
Substitute parts are grouped into two categories: direct electrical equivalents with matching clamping voltage specifications, and functionally compatible alternatives with different clamping voltages that maintain the same reverse standoff voltage and package form factor.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Power - Peak Pulse | Operating Temperature | Package / Case | Product Status |
|---|---|---|---|---|---|---|---|---|
| SMAJ48C | Littelfuse Inc. | 48V | 81.27V | 5.2A | 400W | -65°C ~ 150°C (TJ) | DO-214AC, SMA | Obsolete |
| SMAJ48CA | MDD | 48V | 77.4V | 5.2A | 400W | -50°C ~ 150°C (TJ) | DO-214AC, SMA | Active |
| SZ1SMA48CAT3G | Littelfuse Inc. | 48V | 77.4V | 5.2A | 400W | -65°C ~ 150°C (TJ) | DO-214AC, SMA | Active |
| SMAJ48CA-13-F | Diodes Incorporated | 48V | 77.4V | 5.2A | 400W | -55°C ~ 150°C (TJ) | DO-214AC, SMA | Active |
| SMAJ48CA-TP | Micro Commercial Co | 48V | 77.4V | 5.2A | 400W | -55°C ~ 175°C (TA) | DO-214AC, SMA | Active |
| SMAJ48CA-TR | STMicroelectronics | 48V | 100V | 23A (8/20µs) | 400W | -55°C ~ 150°C (TJ) | DO-214AC, SMA | Active |
| SMAJ48CAE3/TR13 | Microchip Technology | 48V | 77.4V | 6.5A | 500W | -65°C ~ 150°C (TJ) | DO-214AC, SMA | Active |
| SMAJ48CE3/TR13 | Microchip Technology | 48V | 85.5V | 5.8A | 500W | -65°C ~ 150°C (TJ) | DO-214AC, SMA | Active |
| TV04A480JB-G | Comchip Technology | 48V | 77.4V | 5.17A | 400W | -55°C ~ 150°C (TJ) | DO-214AC, SMA | Active |
Engineering Selection Recommendations
Preferred Substitutes (Highest Compatibility):
SZ1SMA48CAT3G (Littelfuse Inc.) is the primary recommended substitute. This part maintains the original manufacturer lineage, matches the full operating temperature range (-65°C ~ 150°C), and provides equivalent electrical performance with a clamping voltage of 77.4V. The part is active and carries AEC-Q101 automotive qualification with REACH compliance.
SMAJ48CAE3/TR13 (Microchip Technology) offers enhanced performance with 6.5A peak pulse current and 500W power dissipation, providing design margin above the original 5.2A specification. Operating temperature range matches the original (-65°C ~ 150°C), and the part is active with full compliance documentation.
Secondary Substitutes (Acceptable with Application Verification):
SMAJ48CA-TP (Micro Commercial Co) provides the widest operating temperature range (-55°C ~ 175°C) and is suitable for applications requiring extended high-temperature performance. The clamping voltage of 77.4V is within acceptable tolerance.
SMAJ48CA-13-F (Diodes Incorporated) and TV04A480JB-G (Comchip Technology) are functionally equivalent alternatives with active product status and full compliance certifications.
Alternative for Higher Transient Energy:
SMAJ48CA-TR (STMicroelectronics) features significantly higher peak pulse current (23A at 8/20µs) and is suitable for applications requiring enhanced transient suppression capability. The 100V clamping voltage represents a trade-off between protection level and component cost.
Not Recommended:
SMAJ48CA (MDD) has a reduced operating temperature range (-50°C ~ 150°C) compared to the original specification and should only be selected if the application does not require the full -65°C lower temperature limit.
Frequently Asked Questions (FAQ)
Q: Can I use a substitute part with a different clamping voltage?
A: Yes, provided the clamping voltage remains within the acceptable range for your circuit protection requirements. The SMAJ48C specifies 81.27V maximum clamping. Substitutes with 77.4V clamping (such as SMAJ48CA-TP or SZ1SMA48CAT3G) provide tighter clamping and are generally acceptable. The SMAJ48CA-TR with 100V clamping is suitable only if your circuit can tolerate higher transient voltages. The SMAJ48CE3/TR13 with 85.5V clamping falls between these options.
Q: What is the difference between the various Microchip Technology options?
A: SMAJ48CAE3/TR13 provides 6.5A peak pulse current and 500W power dissipation with 77.4V clamping. SMAJ48CE3/TR13 provides 5.8A peak pulse current and 500W power dissipation with 85.5V clamping. Both maintain the full -65°C ~ 150°C operating temperature range. Selection depends on whether your application prioritizes current handling capacity or clamping voltage precision.
Q: Are all substitutes available in the same packaging?
A: Yes, all listed substitutes use the DO-214AC (SMA) surface-mount package, ensuring mechanical and electrical compatibility with existing PCB designs. Packaging options vary (Tape & Reel, Cut Tape, or bulk), but the component form factor remains identical.
Q: Which substitute offers the best temperature performance?
A: SZ1SMA48CAT3G, SMAJ48CAE3/TR13, and SMAJ48CE3/TR13 all maintain the original -65°C ~ 150°C operating temperature range. SMAJ48CA-TP extends the upper limit to 175°C but uses TA (ambient) rather than TJ (junction) specification. For applications requiring the full -65°C lower limit, select from the first three options.
Q: Is RoHS compliance maintained across all substitutes?
A: Yes, all listed substitutes are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original SMAJ48C specifications.
Q: Can I use SMAJ48CA-TR as a direct replacement?
A: SMAJ48CA-TR is functionally compatible but not a direct replacement. It features 23A peak pulse current (versus 5.2A) and 100V clamping voltage (versus 81.27V). Use this part only if your circuit design can accommodate higher transient suppression and you require the enhanced current handling capability.
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