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Vishay General Semiconductor - Diodes Division SMAJ43AHE3/5A
- Part No.:
- SMAJ43AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43AHE3/5A.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,213
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Product details
Overview
SMAJ43AHE3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 43 V standoff voltage (VWM), 47.8–52.8 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤69.4 V at 5.8 A peak pulse current (IPPM) under 10/1000 μs waveform - ideal for safeguarding MOSFET gates, sensor signal lines, and power rails in automotive and industrial control systems.
For engineers reviewing the SMAJ43AHE3/5A datasheet, SMAJ43AHE3/5A pinout, SMAJ43AHE3/5A application, or SMAJ43AHE3/5A equivalent, key selection criteria include its AEC-Q101 qualification, 400 W peak pulse power rating (≤78 V), low 0.05 μA reverse leakage at VWM, 120 °C/W junction-to-ambient thermal resistance, and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, conducting only when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%), fast response time (<1 ns), and low incremental surge resistance - critical for suppressing ESD, lightning-induced surges, and inductive switching spikes.
The SMAJ43AHE3/5A is rated for 40 A non-repetitive forward surge current (IFSM) and supports continuous operation from –55 °C to +150 °C junction temperature. Its unidirectional polarity (cathode band marked) enables precise placement in DC-biased circuits where reverse conduction must be blocked until clamping occurs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 43 V - maximum continuous reverse operating voltage before significant leakage; defines safe DC bias margin. |
| VBR (Breakdown Voltage) | 47.8–52.8 V at 1 mA - precise clamping initiation threshold; tight tolerance ensures predictable protection onset. |
| VC (Clamping Voltage) | ≤69.4 V at IPPM = 5.8 A - limits transient voltage seen by downstream ICs; critical for I/O pin survivability. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - energy-handling capacity for common surge waveforms; derates above 78 V to 300 W. |
| ID (Reverse Leakage) | ≤1.0 μA at VWM - negligible standby current; avoids loading low-power sensor or battery-backed circuits. |
| TJ max. | +150 °C - enables use in under-hood automotive and high-temperature industrial environments. |
| Package | SMA (DO-214AC) - surface-mount footprint compatible with IPC-7351B standard; supports reflow soldering at 260 °C peak. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity indicated by cathode band on one end. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or lowest potential node; completes clamping path during overvoltage events. |
| Cathode | High-side connection point | Connected to protected line (e.g., 43 V rail or sensor output); conducts when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control and ADAS modules. |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV, 2 Ω source) without degradation when mounted per recommended pad layout. |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh environments. |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles; no pre-baking required prior to assembly. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes voltage overshoot during clamping - essential for protecting 48 V system components with narrow absolute maximum ratings. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Clamping |
|---|---|
Use Scenario: Protecting 42–48 V supply rails in vehicle body control modules against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between rail and chassis ground to clamp positive-going surges while blocking normal reverse bias. Use Value: Limits rail voltage to ≤69.4 V during 400 W surges, preventing damage to 75 V-rated DC-DC controllers and microcontrollers. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors in factory automation PLC I/O modules from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage (≤1 μA) clamping device across sensor output and ground, preserving signal integrity during normal operation. Use Value: Sub-ns response ensures clamping before 2 kV ESD pulses reach downstream ADC inputs, maintaining measurement accuracy. |
| Telecom DC Power Input Stage | MOSFET Gate Driver Protection |
Use Scenario: Safeguarding 48 V PoE-powered equipment front-end rectifiers and DC-DC converters from lightning-induced surges on outdoor Ethernet cables. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input bus, coordinated with upstream fuses and secondary filtering. Use Value: 400 W rating handles multi-pulse surge stress per IEC 61000-4-5; RoHS-compliant HE3 suffix meets telecom environmental requirements. |
Use Scenario: Preventing gate oxide rupture in high-side N-channel MOSFETs used in motor drive half-bridges exposed to inductive kickback. IC Role / Device Role / Timing Role: Fast-clamping TVS connected between gate and source, triggered by dV/dt exceeding VBR during turn-off. Use Value: 69.4 V clamping voltage stays well below typical 100 V gate-source absolute maximum, enabling reliable 600 V+ bridge operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A-E3/5A | Commercial-grade version; not AEC-Q101 qualified; identical electrical specs and package. | Lacks automotive qualification; unsuitable for under-hood or safety-critical ECUs. | Select when cost sensitivity outweighs automotive compliance requirements. |
| SMBJ43AHE3/5A | Same VWM/VBR/VC specs but in larger SMB (DO-214AA) package; 600 W PPPM rating. | Higher power handling enables longer surge duration support; requires larger PCB area. | Choose for applications needing >400 W surge margin or legacy SMB footprint compatibility. |
Compared with SMAJ43AHE3/5A, the SMAJ43A-E3/5A offers identical protection performance at lower cost but excludes automotive qualification, while the SMBJ43AHE3/5A trades compact size for 50 % higher pulse power - making it suitable for high-energy surge environments where board space permits.
Availability
SMAJ43AHE3/5A is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interface, and telecom DC input protection requiring stable component supply and long-term lifecycle assurance.
Supply support for SMAJ43AHE3/5A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, precision, and automotive-grade validation.
The SMAJ series was developed specifically for high-reliability transient suppression in automotive, industrial, and telecom infrastructure - balancing compact size, AEC-Q101 compliance, and consistent clamping performance across temperature.
FAQ
What is the clamping voltage of the SMAJ43AHE3/5A at its rated peak pulse current?
The SMAJ43AHE3/5A has a maximum clamping voltage (VC) of 69.4 V when subjected to its rated peak pulse current (IPPM) of 5.8 A under the standard 10/1000 μs waveform. This value is measured at TA = 25 °C with the device mounted on 0.2" × 0.2" copper pads per terminal, ensuring realistic thermal conditions for design margining.
Is the SMAJ43AHE3/5A suitable for automotive applications?
Yes, the SMAJ43AHE3/5A is AEC-Q101 qualified and explicitly designated for automotive use via the "HE3" suffix. It meets rigorous stress tests including temperature cycling, high-temperature reverse bias, and ESD, making it appropriate for engine control units, body electronics, and ADAS subsystems where reliability under extreme conditions is mandatory.
How does the SMAJ43AHE3/5A differ from bidirectional variants like SMAJ43CA?
The SMAJ43AHE3/5A is unidirectional and features a cathode band marking, allowing it to block reverse current until clamping occurs - ideal for DC-biased lines. In contrast, SMAJ43CA is bidirectional with no polarity marking and symmetric clamping in both directions, suited for AC signal lines or floating buses where voltage polarity reverses.
What is the thermal resistance of the SMAJ43AHE3/5A, and how does it affect PCB layout?
The SMAJ43AHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads. To maintain TJ ≤ 150 °C under continuous 3.3 W dissipation, designers must ensure adequate copper area and avoid thermal bottlenecks - undersized pads will cause premature thermal shutdown during repetitive surges.
Can the SMAJ43AHE3/5A replace older SMAJ43A parts without layout changes?
Yes, the SMAJ43AHE3/5A uses the same SMA (DO-214AC) package and pinout as legacy SMAJ43A variants, with identical mechanical dimensions and solder pad requirements. The "HE3" suffix denotes AEC-Q101 qualification and RoHS compliance but introduces no footprint or electrical interface changes - enabling drop-in replacement in existing designs.
SMAJ43AHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 5.8A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ43AHE3/5A FAQ
1.How can I place an order for SMAJ43AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43AHE3/5A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMAJ43AHE3/5A reliable?
The price and inventory of SMAJ43AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ43AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ43AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43AHE3/5A?
SMAJ43AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43AHE3/5A order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMAJ43AHE3/5A?
For technical support, including SMAJ43AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43AHE3/5A requirements.
6.How does Aetrix verify that SMAJ43AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ43AHE3/5A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMAJ43AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ43AHE3/5A?
All SMAJ43AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43AHE3/5A, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMAJ43AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ43AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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