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SMAJ48CA-13 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts
Part Overview
The SMAJ48CA-13 is a 48V Transient Voltage Suppressor (TVS) diode manufactured by Diodes Incorporated in SMA (DO-214AC) surface mount package. This bidirectional Zener diode provides transient overvoltage protection with a 77.4V maximum clamping voltage and 5.2A peak pulse current rating. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers for ongoing production and repair applications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 48 | V |
| Voltage - Breakdown (Min) | 53.3 | V |
| Voltage - Clamping (Max) @ Ipp | 77.4 | V |
| Current - Peak Pulse (10/1000µs) | 5.2 | A |
| Power - Peak Pulse | 400 | W |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Package / Case | DO-214AC, SMA | — |
| Type | Zener | — |
| Bidirectional Channels | 1 | — |
| Mounting Type | Surface Mount | — |
Substitute Part Grouping Explanation
Substitution of the SMAJ48CA-13 is determined by strict equivalence across the following critical parameters:
- Voltage - Reverse Standoff (Typ): 48V
- Voltage - Breakdown (Min): 53.3V
- Package / Case: DO-214AC, SMA
- Bidirectional Channels: 1
- Mounting Type: Surface Mount
- Type: Zener
Substitute parts are grouped into two categories based on electrical performance:
Category A - Electrical Equivalents (Identical Clamping Voltage): Parts with 77.4V maximum clamping voltage and 5.2A peak pulse current maintain identical electrical performance to the original SMAJ48CA-13.
Category B - Higher Performance Alternatives (Elevated Clamping Voltage): Parts with clamping voltages of 88.4V or 100V provide enhanced transient suppression capability while maintaining the same 48V standoff voltage and SMA package form factor. These parts are suitable for applications requiring improved overvoltage margin.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Breakdown (Min) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse | Power - Peak Pulse | Operating Temperature | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| SMAJ48CA-13 | Diodes Incorporated | 48V | 53.3V | 77.4V | 5.2A (10/1000µs) | 400W | -55 to 150°C | Discontinued | Non-compliant |
| SMAJ48CA-13-F | Diodes Incorporated | 48V | 53.3V | 77.4V | 5.2A (10/1000µs) | 400W | -55 to 150°C | Active | ROHS3 Compliant |
| SMAJ48CA-TP | Micro Commercial Co | 48V | 53.3V | 77.4V | 5.2A (10/1000µs) | 400W | -55 to 175°C | Active | ROHS3 Compliant |
| SZ1SMA48CAT3G | Littelfuse Inc. | 48V | 53.3V | 77.4V | 5.2A (10/1000µs) | 400W | -65 to 150°C | Active | ROHS3 Compliant |
| SMAJ48CA | MDD | 48V | 53.3V | 77.4V | 5.2A (10/1000µs) | 400W | -50 to 150°C | Active | ROHS3 Compliant |
| SMAJ48CA-TR | STMicroelectronics | 48V | 53.3V | 100V | 23A (8/20µs) | 400W | -55 to 150°C | Active | ROHS3 Compliant |
| SM4T56CAY | STMicroelectronics | 48V | 53.3V | 100V | 23A (8/20µs) | 400W | -55 to 150°C | Active | ROHS3 Compliant |
| SMA6J48CA-TR | STMicroelectronics | 48V | 53.3V | 88.4V | 40A (8/20µs) | 600W | -55 to 175°C | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Replacement (Electrical Equivalence):
SMAJ48CA-13-F (Diodes Incorporated) is the primary direct replacement. It maintains identical electrical specifications while offering active product status and ROHS3 compliance. This part is recommended for applications requiring exact electrical performance match with modern compliance standards.
SMAJ48CA-TP (Micro Commercial Co) and SZ1SMA48CAT3G (Littelfuse Inc.) provide electrical equivalence with extended operating temperature ranges (-55 to 175°C and -65 to 150°C respectively) and active availability. SZ1SMA48CAT3G includes AEC-Q101 automotive qualification.
SMAJ48CA (MDD) offers electrical equivalence with active status and ROHS3 compliance, though with a narrower lower operating temperature limit (-50°C vs. -55°C).
Higher Performance Alternatives:
SMA6J48CA-TR (STMicroelectronics) provides 88.4V clamping voltage with 40A peak pulse current and 600W power rating, suitable for applications requiring enhanced transient suppression margin. Extended operating temperature range to 175°C is available.
SMAJ48CA-TR and SM4T56CAY (both STMicroelectronics) offer 100V clamping voltage with 23A peak pulse current. These parts are suitable for circuits requiring maximum overvoltage protection while maintaining the 48V standoff voltage specification.
All substitute parts maintain DO-214AC (SMA) package compatibility, bidirectional operation, and surface mount configuration. All active alternatives are ROHS3 compliant.
Frequently Asked Questions (FAQ)
Q: Can SMAJ48CA-13-F be used as a direct replacement for SMAJ48CA-13?
A: Yes. SMAJ48CA-13-F is electrically identical with 48V standoff voltage, 77.4V clamping voltage, and 5.2A peak pulse current. It maintains the same DO-214AC (SMA) package and is actively manufactured with ROHS3 compliance.
Q: What is the difference between the 77.4V clamping voltage parts and the 100V clamping voltage parts?
A: The 77.4V clamping voltage parts (SMAJ48CA-13-F, SMAJ48CA-TP, SZ1SMA48CAT3G, SMAJ48CA) provide electrical equivalence to the original SMAJ48CA-13. The 100V clamping voltage parts (SMAJ48CA-TR, SM4T56CAY) offer higher transient suppression capability with increased peak pulse current (23A vs. 5.2A), suitable for applications requiring enhanced overvoltage margin.
Q: Are all substitute parts in the same package?
A: Yes. All substitute parts use the DO-214AC (SMA) surface mount package, ensuring mechanical and electrical compatibility with existing PCB layouts.
Q: Which substitute part has the widest operating temperature range?
A: SMAJ48CA-TP (Micro Commercial Co) and SMA6J48CA-TR (STMicroelectronics) both extend to 175°C maximum junction temperature, compared to 150°C for most alternatives. SZ1SMA48CAT3G extends to -65°C minimum, providing the widest low-temperature range.
Q: Do any substitute parts have automotive qualification?
A: Yes. SZ1SMA48CAT3G (Littelfuse Inc.) carries AEC-Q101 automotive qualification. SMA6J48CA-TR (STMicroelectronics) is also suitable for automotive applications with extended temperature range to 175°C.
Q: What is the difference between the 8/20µs and 10/1000µs pulse specifications?
A: These represent different test waveforms for peak pulse current measurement. The 10/1000µs waveform (used for SMAJ48CA-13 and equivalent parts) is a longer duration pulse, while 8/20µs (used for higher performance alternatives) is a shorter, more severe transient. Both specifications are valid for TVS diode characterization; selection depends on the specific transient threat profile in the application circuit.
Q: Is ROHS3 compliance required for my application?
A: ROHS3 compliance is mandatory for products sold in the European Union and many other markets. All active substitute parts listed are ROHS3 compliant. The original SMAJ48CA-13 is non-compliant, making the transition to compliant alternatives necessary for new designs and ongoing production.
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