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SMAJ43C Equivalent & Substitute Parts
Part Overview
The SMAJ43C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc. in the DO-214AC (SMA) surface mount package. This component is rated for 43V reverse standoff voltage with a 69.4V maximum clamping voltage and 5.8A peak pulse current, delivering 400W peak pulse power. The SMAJ43C is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 43 | V |
| Voltage - Breakdown (Min) | 47.8 | V |
| Voltage - Clamping (Max) @ Ipp | 69.4 | V |
| Current - Peak Pulse (10/1000µs) | 5.8 | A |
| Power - Peak Pulse | 400 | W |
| Operating Temperature Range | -65 to 150 | °C (TJ) |
| Package / Case | DO-214AC, SMA | — |
| Mounting Type | Surface Mount | — |
| Bidirectional Channels | 1 | — |
| Type | Zener | — |
Substitute Part Grouping Explanation
Substitute parts for the SMAJ43C are classified into two categories based on electrical parameter alignment:
Direct Substitutes maintain identical electrical specifications across all critical parameters: 43V reverse standoff voltage, 47.8V minimum breakdown voltage, 69.4V maximum clamping voltage, 5.8A peak pulse current, and 400W peak pulse power. These parts are interchangeable at the circuit level and require no design modification.
Similar Substitutes share the same voltage rating (43V reverse standoff, 47.8V breakdown minimum) and package format (DO-214AC/SMA) but differ in clamping voltage, peak pulse current, or both. These parts function within the same protection envelope but exhibit different transient response characteristics.
The critical parameters determining substitution eligibility are:
- Voltage - Reverse Standoff (Typ): 43V
- Voltage - Breakdown (Min): 47.8V
- Package / Case: DO-214AC, SMA
- Mounting Type: Surface Mount
- Bidirectional Channels: 1
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Product Status | Voltage - Reverse Standoff (Typ) [V] | Voltage - Breakdown (Min) [V] | Voltage - Clamping (Max) @ Ipp [V] | Current - Peak Pulse (10/1000µs) [A] | Power - Peak Pulse [W] | Operating Temperature [°C] | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| SMAJ43C | Littelfuse Inc. | Obsolete | 43 | 47.8 | 69.4 | 5.8 | 400 | -65 to 150 | RoHS Compliant |
| SMAJ43CA | Good-Ark Semiconductor | Active | 43 | 47.8 | 69.4 | 5.8 | 400 | -55 to 150 | ROHS3 Compliant |
| SM4T50CAY | STMicroelectronics | Active | 43 | 47.8 | 91 | 25 (8/20µs) | 400 | -55 to 150 | ROHS3 Compliant |
| SMAJ43C | Taiwan Semiconductor Corporation | Active | 43 | 47.8 | 76.7 | 5.2 | 400 | -55 to 150 | ROHS3 Compliant |
| SMAJ43CA-13-F | Diodes Incorporated | Active | 43 | 47.8 | 69.4 | 5.7 | 400 | -55 to 150 | ROHS3 Compliant |
| SMAJ43CA-E3/5A | Vishay General Semiconductor - Diodes Division | Active | 43 | 47.8 | 69.4 | 5.8 | 400 | -55 to 150 | ROHS3 Compliant |
| SMAJ43CA-E3/61 | Vishay General Semiconductor - Diodes Division | Active | 43 | 47.8 | 69.4 | 5.8 | 400 | -55 to 150 | ROHS3 Compliant |
| SMAJ43CA-M3/5A | Vishay General Semiconductor - Diodes Division | Active | 43 | 47.8 | 69.4 | 5.8 | 400 | -55 to 150 | ROHS3 Compliant |
| SMAJ43CA-M3/61 | Vishay General Semiconductor - Diodes Division | Active | 43 | 47.8 | 69.4 | 5.8 | 400 | -55 to 150 | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Substitutes (Recommended for Obsolescence Replacement)
The following parts are direct electrical equivalents to the SMAJ43C and are suitable for direct replacement without circuit modification:
- SMAJ43CA (Good-Ark Semiconductor): Active product status with identical electrical specifications. Operating temperature range reduced to -55°C to 150°C. ROHS3 compliant.
- SMAJ43CA-13-F (Diodes Incorporated): Active product status with 69.4V clamping voltage and 5.7A peak pulse current (within tolerance of 5.8A specification). Operating temperature range -55°C to 150°C. ROHS3 compliant.
- SMAJ43CA-E3/5A (Vishay General Semiconductor - Diodes Division): Active product status with identical electrical specifications. TransZorb® series. Operating temperature range -55°C to 150°C. ROHS3 compliant.
- SMAJ43CA-E3/61 (Vishay General Semiconductor - Diodes Division): Active product status with identical electrical specifications. TransZorb® series. Operating temperature range -55°C to 150°C. ROHS3 compliant.
- SMAJ43CA-M3/5A (Vishay General Semiconductor - Diodes Division): Active product status with identical electrical specifications. TransZorb® series. Operating temperature range -55°C to 150°C. ROHS3 compliant.
- SMAJ43CA-M3/61 (Vishay General Semiconductor - Diodes Division): Active product status with identical electrical specifications. TransZorb® series. Operating temperature range -55°C to 150°C. ROHS3 compliant.
Similar Substitutes (Application-Dependent Selection)
The following parts share the same voltage rating and package but differ in transient response characteristics:
- SM4T50CAY (STMicroelectronics): Active product status with 43V reverse standoff voltage and 47.8V breakdown minimum. Clamping voltage is 91V (higher than SMAJ43C) with significantly higher peak pulse current of 25A (8/20µs). AEC-Q101 automotive qualified. Operating temperature range -55°C to 150°C. ROHS3 compliant. Suitable for applications requiring higher current handling capacity.
- SMAJ43C (Taiwan Semiconductor Corporation): Active product status with 43V reverse standoff voltage and 47.8V breakdown minimum. Clamping voltage is 76.7V (higher than SMAJ43C) with 5.2A peak pulse current (lower than SMAJ43C specification). Operating temperature range -55°C to 150°C. ROHS3 compliant.
All substitute parts maintain the DO-214AC (SMA) surface mount package format and are compatible with existing PCB layouts. All listed substitutes are ROHS3 compliant and meet REACH requirements where applicable.
Frequently Asked Questions (FAQ)
Q: Can SMAJ43CA be used as a direct replacement for SMAJ43C?
A: Yes. SMAJ43CA manufactured by Good-Ark Semiconductor is a direct electrical equivalent with identical voltage ratings (43V reverse standoff, 47.8V breakdown minimum, 69.4V clamping maximum), current rating (5.8A peak pulse), and power rating (400W peak pulse). Both use the DO-214AC (SMA) surface mount package. The operating temperature range is reduced from -65°C to -55°C minimum, which is acceptable for most applications.
Q: What is the difference between direct substitutes and similar substitutes?
A: Direct substitutes maintain all electrical specifications of the SMAJ43C, including clamping voltage and peak pulse current. Similar substitutes share the same voltage rating and package but differ in clamping voltage or peak pulse current. Direct substitutes are interchangeable without design modification. Similar substitutes require circuit analysis to confirm compatibility with the application's transient response requirements.
Q: Why does the SMAJ43C from Taiwan Semiconductor Corporation have a higher clamping voltage (76.7V) than the Littelfuse SMAJ43C (69.4V)?
A: Clamping voltage variation within the same part number across manufacturers reflects different manufacturing processes and design tolerances. The Taiwan Semiconductor Corporation version exhibits higher clamping voltage, which affects the peak voltage experienced by protected circuitry during transient events. This difference must be evaluated against the protected circuit's voltage withstand capability.
Q: Are all substitute parts RoHS compliant?
A: Yes. All listed substitute parts are ROHS3 compliant. The original SMAJ43C is RoHS compliant. All active substitute parts meet current RoHS3 requirements and REACH regulations where applicable.
Q: Can SM4T50CAY replace SMAJ43C in all applications?
A: SM4T50CAY shares the same 43V reverse standoff voltage and DO-214AC package but differs significantly in clamping voltage (91V versus 69.4V) and peak pulse current (25A at 8/20µs versus 5.8A at 10/1000µs). This part is suitable only for applications where higher clamping voltage and current handling are acceptable or beneficial. Circuit analysis is required to confirm compatibility.
Q: What is the significance of the packaging designations (CT, TR, Digi-Reel®)?
A: Packaging designations indicate the form factor for procurement and assembly: Cut Tape (CT) is used for manual assembly or small-volume production; Tape & Reel (TR) is standard for automated assembly lines; Digi-Reel® is a specific packaging format. All substitute parts are available in surface mount formats compatible with standard PCB assembly processes. The electrical specifications remain identical regardless of packaging format.
Q: Is the operating temperature range difference between SMAJ43C (-65°C to 150°C) and substitute parts (-55°C to 150°C) significant?
A: The lower temperature limit of -55°C in substitute parts is acceptable for most commercial and industrial applications. Applications requiring operation below -55°C must confirm that substitute parts meet the specific thermal requirements. The upper temperature limit of 150°C is identical across all parts.
Q: What certifications should I verify when selecting a substitute part?
A: Verify RoHS compliance status (all listed parts are ROHS3 compliant), REACH status (all listed parts are REACH unaffected or compliant), and any application-specific certifications such as AEC-Q101 for automotive applications (SM4T50CAY carries this qualification). Confirm that the selected part meets your supply chain and regulatory requirements.
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