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SMAJ43A-13 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts
Part Overview
The SMAJ43A-13 is a unidirectional Zener-type transient voltage suppressor manufactured by Diodes Incorporated in a surface-mount SMA (DO-214AC) package. This component is designed for general-purpose transient voltage suppression applications with a 43V reverse standoff voltage and 69.4V maximum clamping voltage. The part is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer Part Number | SMAJ43A-13 | — |
| Manufacturer | Diodes Incorporated | — |
| Category | Transient Voltage Suppressors (TVS) | — |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| Voltage - Reverse Standoff (Typ) | 43 | V |
| Voltage - Breakdown (Min) | 47.8 | V |
| Voltage - Clamping (Max) @ Ipp | 69.4 | V |
| Current - Peak Pulse (10/1000µs) | 5.7 | A |
| Power - Peak Pulse | 400 | W |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Package / Case | DO-214AC, SMA | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | RoHS non-compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for the SMAJ43A-13 are classified based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:
Critical Parameters for Substitution:
- Voltage - Reverse Standoff (Typ): 43V
- Voltage - Breakdown (Min): 47.8V
- Voltage - Clamping (Max) @ Ipp: 69.4V (or higher, within application tolerance)
- Current - Peak Pulse (10/1000µs): 5.7A (or higher)
- Power - Peak Pulse: 400W
- Package / Case: DO-214AC, SMA (or compatible surface-mount package)
- Mounting Type: Surface Mount
- Operating Temperature Range: -55°C to 150°C (or wider)
Grouping Categories:
Group 1: Direct Electrical & Package Equivalents (SMA Package, 69.4V Clamp)
- SMAJ43A-13-F (Diodes Incorporated) — Same manufacturer, identical electrical specifications, Tape & Reel packaging, RoHS3 compliant, Active status
- SMAJ43A (MDD) — Identical electrical specifications with 5.8A peak pulse current, Active status, RoHS3 compliant
- SZ1SMA43AT3G (Littelfuse Inc.) — Identical electrical specifications, 5.8A peak pulse current, Automotive grade with AEC-Q101 qualification, RoHS3 compliant
Group 2: Electrical Equivalents with Alternative Package (SOD-123W Package, 69.4V Clamp)
- PTVS43VS1UR,115 (Nexperia USA Inc.) — Identical electrical specifications, 5.8A peak pulse current, SOD-123W package, Automotive grade with AEC-Q101 qualification, RoHS3 compliant
Group 3: Higher Performance Alternatives (SMA Package, 91V Clamp)
- SM4T50AY (STMicroelectronics) — Higher clamping voltage (91V), significantly higher peak pulse current (25A at 8/20µs), Automotive grade with AEC-Q101 qualification, RoHS3 compliant
- SMAJ43A-TR (STMicroelectronics) — Higher clamping voltage (91V), significantly higher peak pulse current (25A at 8/20µs), SMA package, Automotive grade with AEC-Q101 qualification, RoHS3 compliant
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Breakdown Min (V) | Voltage - Clamping Max @ Ipp (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Package / Case | Operating Temp (°C) | RoHS Status | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|
| SMAJ43A-13 | Diodes Incorporated | 43 | 47.8 | 69.4 | 5.7 | 400 | DO-214AC, SMA | -55 to 150 | Non-compliant | Discontinued |
| SMAJ43A-13-F | Diodes Incorporated | 43 | 47.8 | 69.4 | 5.7 | 400 | DO-214AC, SMA | -55 to 150 | RoHS3 Compliant | Active |
| SMAJ43A | MDD | 43 | 47.8 | 69.4 | 5.8 | 400 | DO-214AC, SMA | -50 to 150 | RoHS3 Compliant | Active |
| SZ1SMA43AT3G | Littelfuse Inc. | 43 | 47.8 | 69.4 | 5.8 | 400 | DO-214AC, SMA | -65 to 150 | RoHS3 Compliant | Active |
| PTVS43VS1UR,115 | Nexperia USA Inc. | 43 | 47.8 | 69.4 | 5.8 | 400 | SOD-123W | -55 to 150 | RoHS3 Compliant | Active |
| SM4T50AY | STMicroelectronics | 43 | 47.8 | 91 | 25 (8/20µs) | 400 | DO-214AC, SMA | -55 to 150 | RoHS3 Compliant | Active |
| SMAJ43A-TR | STMicroelectronics | 43 | 47.8 | 91 | 25 (8/20µs) | 400 | DO-214AC, SMA | -55 to 150 | RoHS3 Compliant | Active |
Engineering Selection Recommendations
For Direct Replacement (Identical Electrical Performance):
SMAJ43A-13-F is the primary recommended substitute. It is manufactured by Diodes Incorporated with identical electrical specifications to the original SMAJ43A-13, maintains the same SMA package footprint, and is currently in active production status with RoHS3 compliance. This part provides the most seamless transition for existing designs.
SMAJ43A (MDD) and SZ1SMA43AT3G (Littelfuse Inc.) are functionally equivalent alternatives with marginally higher peak pulse current (5.8A vs. 5.7A) and identical clamping voltage. Both are RoHS3 compliant and actively produced. SZ1SMA43AT3G includes Automotive grade qualification (AEC-Q101) and extended lower temperature range (-65°C), providing additional design margin for demanding applications.
For Package-Constrained Designs:
PTVS43VS1UR,115 (Nexperia USA Inc.) provides identical electrical performance in a SOD-123W package. This option is suitable only if PCB layout constraints require a smaller footprint than the standard SMA package. The part carries Automotive grade qualification (AEC-Q101) and RoHS3 compliance.
For Higher Transient Energy Applications:
SM4T50AY and SMAJ43A-TR (both STMicroelectronics) offer significantly higher peak pulse current capability (25A at 8/20µs pulse width) with a higher clamping voltage of 91V. These parts are suitable for applications requiring greater transient suppression energy. Both maintain the SMA package, carry Automotive grade qualification (AEC-Q101), and are RoHS3 compliant. Selection between these two depends on packaging preference (Tape & Reel vs. Cut Tape & Digi-Reel).
Compliance Considerations:
The original SMAJ43A-13 is RoHS non-compliant. All recommended substitutes are RoHS3 compliant, supporting modern supply chain and regulatory requirements. For automotive or mission-critical applications, parts with AEC-Q101 qualification (SZ1SMA43AT3G, PTVS43VS1UR,115, SM4T50AY, SMAJ43A-TR) provide additional reliability assurance.
Frequently Asked Questions (FAQ)
Q: Can SMAJ43A-13-F be used as a direct drop-in replacement for SMAJ43A-13?
A: Yes. SMAJ43A-13-F is manufactured by the same company (Diodes Incorporated) with identical electrical specifications, the same SMA package footprint, and equivalent thermal characteristics. The primary difference is packaging format (Tape & Reel vs. bulk) and RoHS3 compliance status. No circuit redesign is required.
Q: What is the difference between the 69.4V clamping voltage parts and the 91V clamping voltage parts?
A: The 69.4V clamping voltage group (SMAJ43A-13-F, SMAJ43A, SZ1SMA43AT3G, PTVS43VS1UR,115) provides tighter voltage regulation during transient events. The 91V clamping voltage group (SM4T50AY, SMAJ43A-TR) allows higher voltage transients to pass through before clamping, but offers significantly higher peak pulse current handling (25A vs. 5.7-5.8A). Selection depends on the specific transient voltage and energy levels in the application.
Q: Are all substitute parts RoHS compliant?
A: Yes. All recommended substitute parts are RoHS3 compliant. The original SMAJ43A-13 is RoHS non-compliant. If RoHS compliance is a design requirement, any of the recommended substitutes satisfy this criterion.
Q: Can I use PTVS43VS1UR,115 (SOD-123W package) in place of the SMA package parts?
A: PTVS43VS1UR,115 provides identical electrical performance but uses a different package (SOD-123W vs. SMA/DO-214AC). This substitution requires PCB layout modification and is only viable if the smaller SOD-123W footprint is acceptable or preferred. Verify PCB trace routing and thermal management compatibility before implementation.
Q: Which substitute part is best for automotive applications?
A: SZ1SMA43AT3G, PTVS43VS1UR,115, SM4T50AY, and SMAJ43A-TR all carry Automotive grade qualification with AEC-Q101 certification. For equivalent electrical performance to the original part, SZ1SMA43AT3G is recommended. For higher transient energy handling, SM4T50AY or SMAJ43A-TR are preferred.
Q: What is the difference between SMAJ43A (MDD) and SZ1SMA43AT3G (Littelfuse)?
A: Both parts have identical electrical specifications (43V standoff, 69.4V clamp, 5.8A peak pulse). SZ1SMA43AT3G includes Automotive grade qualification (AEC-Q101) and operates over a wider temperature range (-65°C to 150°C vs. -50°C to 150°C). SMAJ43A (MDD) is suitable for general-purpose applications, while SZ1SMA43AT3G is preferred for automotive or extended temperature range requirements.
Q: Is there a performance difference between SMAJ43A-13-F and SMAJ43A-TR?
A: Yes. SMAJ43A-13-F maintains the original 69.4V clamping voltage and 5.7A peak pulse current. SMAJ43A-TR has a higher 91V clamping voltage and significantly higher 25A peak pulse current (8/20µs). SMAJ43A-13-F is the direct equivalent; SMAJ43A-TR is a higher-performance alternative for applications requiring greater transient suppression capability.
Q: What inventory status should I consider when selecting a substitute?
A: All recommended substitute parts are currently in active production with substantial inventory availability (1,130 to 18,874 pieces reported in stock). Procurement risk is minimal across all options. Selection should prioritize electrical and compliance requirements rather than inventory status.
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