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Vishay General Semiconductor - Diodes Division SMAJ45HE3/5A
- Part No.:
- SMAJ45HE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45HE3/5A.pdf
- Description:
- TVS DIODE 45VWM 80.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,717
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Product details
Overview
SMAJ45HE3/5A from Vishay General Semiconductor is a high-reliability, AEC-Q101-qualified unidirectional transient voltage suppressor (TVS) in DO-214AC (SMA) package, designed for automotive and industrial overvoltage protection. It features 45 V stand-off voltage (VWM), 80.3 V maximum clamping voltage (VC) at 5.0 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 µs waveform), protecting sensitive MOSFETs and signal lines against inductive switching transients.
For engineers reviewing the SMAJ45HE3/5A datasheet, SMAJ45HE3/5A pinout, SMAJ45HE3/5A application, or SMAJ45HE3/5A equivalent, this device is selected for robust ESD and surge immunity in automotive powertrain sensors, industrial PLC I/O modules, and DC-DC converter input rails where AEC-Q101 qualification, low leakage (<1 µA at VWM), and stable clamping under repetitive surges are critical.
Technical Context
This TVS diode employs a glass-passivated silicon junction optimized for fast response (<1 ps) and low incremental surge resistance. Its unidirectional configuration provides forward conduction capability (VF = 3.5 V at 25 A) while clamping reverse transients to ≤80.3 V at 5.0 A.
Thermal performance is defined by RθJA = 120 °C/W (on 0.2 × 0.2" copper pads) and RθJL = 30 °C/W, enabling reliable operation up to TJ = +150 °C. The HE3 suffix confirms AEC-Q101 qualification, JESD201 Class 2 whisker resistance, and RoHS compliance per 2002/95/EC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin for 36–42 V automotive systems. |
| VBR min/max | 50.0 V / 61.1 V at 1.0 mA - Breakdown voltage range ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | 80.3 V at 5.0 A - Clamping voltage limits protected circuit stress during 10/1000 µs surge events. |
| PPPM | 400 W - Peak pulse power rating on standard PCB pad layout; derates to 300 W above 78 V. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine), supporting load dump survival. |
| TJ range | −55 °C to +150 °C - Full automotive temperature range operation without derating. |
| Leakage ID | <1 µA at 45 V - Negligible standby current impact on battery-powered or low-power sensor circuits. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, matte tin-plated leads, MSL Level 1 (260 °C reflow compatible). Cathode indicated by band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / low-impedance discharge path during positive transients | Connected to protected line (e.g., 12 V rail); conducts during load dump or reverse-battery events when used with external polarity control. |
| Cathode | Clamping node / reference terminal | Connected to system ground or lower-potential rail; establishes VWM and defines clamping threshold relative to reference plane. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensors requiring zero-failure reliability under thermal cycling and vibration. |
| Glass-passivated junction | Ensures long-term stability of breakdown voltage and leakage current across humidity, temperature, and lifetime stress conditions. |
| 400 W 10/1000 µs surge rating | Withstands ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 3a/b (line capacitance discharge) without degradation. |
| Low Rsurge | Minimizes voltage overshoot during fast-rising transients (e.g., ESD >15 kV contact), improving protection margin for downstream ICs. |
| MSL Level 1 | Enables direct placement into standard SMT reflow profiles (peak 260 °C) without pre-baking or special handling. |
Applications
| Automotive Powertrain Sensors | Industrial PLC Digital Inputs |
|---|---|
|
Use Scenario: Protecting crankshaft position sensor signal lines from alternator load dump and relay coil flyback in 12 V engine bays. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and chassis ground to clamp transients <100 ns after onset. Use Value: Maintains signal integrity below 80.3 V clamping limit, preventing false triggering or latch-up in Hall-effect sensor ICs. |
Use Scenario: Shielding 24 V DC digital input channels in programmable logic controllers from field-wiring induced surges and ESD. IC Role / Device Role / Timing Role: Front-end transient suppressor on each optocoupler input, absorbing energy before isolation barrier. Use Value: Enables compliance with IEC 61000-4-5 Level 3 (2 kV line-earth) without additional series impedance or filtering. |
| DC-DC Converter Input Rails | Automotive Body Control Modules |
|
Use Scenario: Safeguarding buck converter inputs in infotainment head units subjected to cold-crank and jump-start voltage excursions. IC Role / Device Role / Timing Role: Primary overvoltage clamp on VIN pin, limiting input to ≤80.3 V during 60 V transients. Use Value: Prevents damage to internal MOSFETs and control ICs, eliminating need for higher-voltage-rated (and costlier) power stages. |
Use Scenario: Securing LIN bus transceiver supply pins against battery reversal and load dump in door module ECUs. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (anode grounded) providing reverse-battery and surge protection. Use Value: Survives 40 A IFSM surge events while maintaining <1 µA leakage, preserving sleep-mode current budget. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45AHE3/5A | Lower VBR range (50.0–55.3 V) and tighter tolerance; clamps at 72.7 V @ 5.5 A. | Better suited for 42 V mild-hybrid systems requiring lower clamping voltage and tighter VWM margin. | Select when design requires reduced clamping overshoot and tighter VBR distribution, accepting slightly lower surge current rating. |
| SMBJ45HE3/5A | Same VWM/VC specs but in DO-214AA (SMB) package; 600 W PPPM rating due to larger thermal mass. | Preferred for higher-energy surge environments (e.g., heavy-duty vehicle alternators) where PCB space allows larger footprint. | Choose when system-level surge testing exceeds 400 W requirements and board layout accommodates SMB's 0.210" × 0.145" body. |
Compared with SMAJ45HE3/5A, SMAJ45AHE3/5A offers tighter breakdown control and lower clamping for precision 42 V systems, while SMBJ45HE3/5A delivers higher surge energy handling in a physically larger package-neither is pin-compatible, but both serve overlapping automotive protection roles with distinct thermal and tolerance trade-offs.
Availability
SMAJ45HE3/5A is available at Aetrix Electronics and suitable for automotive powertrain sensors, industrial PLC digital inputs, and DC-DC converter input rails requiring stable component supply, AEC-Q101 traceability, and long-lifecycle support.
Supply support for SMAJ45HE3/5A 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 designs discrete semiconductors for high-reliability power, protection, and sensing applications, with global manufacturing and AEC-Q101 validation infrastructure.
The SMAJ series targets automotive and industrial transient suppression, delivering standardized TVS performance in compact surface-mount packages with rigorous qualification for harsh-environment deployment.
FAQ
What is the clamping voltage of SMAJ45HE3/5A at its rated peak pulse current?
The SMAJ45HE3/5A clamps to a maximum of 80.3 V at 5.0 A peak pulse current (IPPM) under a 10/1000 µs waveform. This value is measured per Fig. 3 in Vishay document 88390 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ45HE3/5A maintains this clamping performance across its full operating temperature range.
Is SMAJ45HE3/5A qualified for automotive use?
Yes, SMAJ45HE3/5A carries the HE3 suffix, confirming AEC-Q101 qualification, JESD201 Class 2 whisker resistance, and RoHS compliance. It is rated for −55 °C to +150 °C junction temperature and validated for automotive powertrain, body electronics, and infotainment applications. The SMAJ45HE3/5A meets all stress tests required for under-hood deployment.
How does the HE3 suffix differ from E3 in SMAJ45HE3/5A?
The HE3 suffix denotes high-reliability, automotive-grade qualification (AEC-Q101), whereas E3 indicates commercial-grade RoHS compliance only. SMAJ45HE3/5A undergoes extended life testing, enhanced process controls, and stricter lot acceptance criteria versus SMAJ45E3/5A. Both share identical electrical specs, but only SMAJ45HE3/5A is approved for automotive safety-critical functions.
What is the maximum reverse leakage current for SMAJ45HE3/5A at 45 V?
The maximum reverse leakage current (ID) for SMAJ45HE3/5A is 1.0 µA at VWM = 45 V and TA = 25 °C. This ultra-low leakage preserves battery life in always-on automotive modules and avoids loading effects on high-impedance sensor interfaces. The SMAJ45HE3/5A maintains leakage <5 µA across its full −55 °C to +125 °C operating range.
Can SMAJ45HE3/5A be used in bidirectional protection configurations?
No-SMAJ45HE3/5A is a unidirectional TVS diode. For bidirectional protection, Vishay specifies CA-suffix parts (e.g., SMAJ45CA). Using SMAJ45HE3/5A in reverse-biased mode risks permanent damage due to lack of symmetrical breakdown. The SMAJ45HE3/5A must be oriented with cathode toward the protected line's reference potential to function correctly.
SMAJ45HE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 80.3V
- Current - Peak Pulse (10/1000µs):
- 5A
- 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)
SMAJ45HE3/5A FAQ
1.How can I place an order for SMAJ45HE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45HE3/5A 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 SMAJ45HE3/5A reliable?
The price and inventory of SMAJ45HE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ45HE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ45HE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45HE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45HE3/5A?
SMAJ45HE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45HE3/5A 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 SMAJ45HE3/5A?
For technical support, including SMAJ45HE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45HE3/5A requirements.
6.How does Aetrix verify that SMAJ45HE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ45HE3/5A 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 SMAJ45HE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ45HE3/5A?
All SMAJ45HE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45HE3/5A, 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 SMAJ45HE3/5A part is unused and in its original packaging.
Return procedure for SMAJ45HE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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