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Vishay General Semiconductor - Diodes Division SMAJ45AHE3/5A
- Part No.:
- SMAJ45AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45AHE3/5A.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,460
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Product details
Overview
SMAJ45AHE3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection on DC power rails and signal lines. It features a 45 V stand-off voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA, 72.7 V maximum clamping voltage (VC) at 5.5 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive ECUs, industrial sensor interfaces, and 24 V/48 V power supply inputs.
For engineers reviewing the SMAJ45AHE3/5A datasheet, SMAJ45AHE3/5A pinout, SMAJ45AHE3/5A application, or SMAJ45AHE3/5A equivalent, key selection criteria include its AEC-Q101 qualification, SMA (DO-214AC) surface-mount package, low incremental surge resistance, fast response time (<1 ns), and compliance with UL 497B for telecom and industrial surge protection systems.
Technical Context
This unidirectional TVS diode operates as a shunt-clamping device: under normal conditions it presents high impedance (>1 MΩ at 45 V), but triggers into low-impedance conduction when transient voltage exceeds VBR (50.0–55.3 V), limiting downstream voltage to ≤72.7 V at 5.5 A. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 μA at VWM).
Thermally, it supports operation from –55 °C to +150 °C with RθJA = 120 °C/W and RθJL = 30 °C/W, enabling reliable performance on standard PCB copper pads (0.2" × 0.2"). The device meets J-STD-020 MSL Level 1 and is qualified to AEC-Q101 for automotive under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 48 V systems. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - Confirmed breakdown range ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 72.7 V at 5.5 A - Clamping voltage limits protected circuit stress during 10/1000 μs transients (IEC 61000-4-5). |
| PPPM | 400 W - Peak pulse power handling capability with 10/1000 μs waveform; derates to 300 W above 78 V. |
| ID @ VWM | ≤1.0 μA - Ultra-low reverse leakage preserves efficiency in battery-powered and low-power sensor nodes. |
| TJ max. | +150 °C - Enables use in under-hood automotive environments and industrial enclosures without forced cooling. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with cathode band marking; compatible with automated pick-and-place. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1, 260 °C reflow peak.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when V > VBR - polarity-critical for unidirectional operation. |
| Anode | Reference/ground return path | Typically tied to system ground or low-impedance return plane; completes clamping path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use per stress test requirements - supports long-term reliability in harsh thermal/vibration environments. |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 48 V bus lines without degradation. |
| Glass passivated junction | Ensures stable VBR tolerance, low leakage drift over time, and resistance to humidity-induced parameter shift. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during transients - critical for protecting 3.3 V/5 V logic interfaces downstream of protection stage. |
| MSL Level 1, 260 °C reflow compatible | Enables single-pass lead-free assembly without pre-baking or moisture sensitivity concerns. |
Applications
| Automotive Body Control Module (BCM) | Industrial 4–20 mA Sensor Transmitter |
|---|---|
Use Scenario: Protects microcontroller I/O and LIN bus transceivers from load dump and ISO 7637-2 pulses on 12 V/24 V supply rails. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed between VBAT and GND, triggered within <1 ns to clamp transients to ≤72.7 V. Use Value: Prevents latch-up or permanent damage to 5 V LDOs and CAN/LIN PHYs during 12 V system load dump events (up to 35 V sustained, 60 V spikes). |
Use Scenario: Shields analog front-end op-amps and ADC inputs in loop-powered 4–20 mA transmitters exposed to field wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS mounted across input terminals (V+ to GND), clamping induced surges before they reach precision signal conditioning circuitry. Use Value: Maintains ±0.1% measurement accuracy by limiting transient-induced offset shift and preventing op-amp saturation during 8 kV contact ESD events. |
| Telecom Power Feeding Interface | Smart Building PoE-PD Protection |
Use Scenario: Safeguards DC feed circuitry in remote radio units receiving 48 V phantom power over twisted-pair cabling subject to lightning-induced surges. IC Role / Device Role / Timing Role: Primary shunt protector on 48 V input rail, coordinated with upstream gas discharge tube (GDT) for staged surge suppression. Use Value: Limits let-through voltage to <75 V during 10/1000 μs surges, preserving integrity of DC-DC converters and Ethernet PHYs compliant with IEEE 802.3bt. |
Use Scenario: Protects powered-device (PD) interface ICs in PoE switches and injectors against cable discharge events and accidental AC mains contact. IC Role / Device Role / Timing Role: Unidirectional TVS placed between PSE output and PD controller IC, clamping common-mode surges on data/power pairs. Use Value: Enables Class 5/6 PD compliance by suppressing transients to <72.7 V before they trigger overvoltage lockout in IEEE 802.3af/at/bt controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A-E3/5A | Same electrical specs and package; RoHS-compliant commercial grade (non-AEC-Q101). | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive qualification requirement and ambient temperature stays ≤125 °C. |
| SMBJ45AHE3/5A | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package - 25 % larger footprint, 600 W PPPM rating. | Higher power handling enables use in higher-energy surge environments (e.g., outdoor telecom cabinets). | Choose when system-level surge testing requires >400 W clamping margin or board layout allows larger SMB footprint. |
Compared with SMAJ45AHE3/5A, SMAJ45A-E3/5A offers identical protection performance without AEC-Q101 validation, while SMBJ45AHE3/5A trades smaller PCB area for 50 % higher pulse power headroom - enabling design flexibility across automotive, industrial, and infrastructure applications.
Availability
SMAJ45AHE3/5A is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, telecom power feeding circuits, and PoE-powered device protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ45AHE3/5A 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series is engineered for high-reliability transient suppression in automotive, industrial, and telecom systems - delivering consistent clamping behavior, low leakage, and validated AEC-Q101 performance in compact surface-mount packages.
FAQ
What is the clamping voltage of SMAJ45AHE3/5A at its rated peak pulse current?
The SMAJ45AHE3/5A exhibits a maximum clamping voltage (VC) of 72.7 V at 5.5 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during standardized surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMAJ45AHE3/5A suitable for automotive applications?
Yes, SMAJ45AHE3/5A is AEC-Q101 qualified and specifically intended for automotive use. Its construction includes glass-passivated junctions, MSL Level 1 moisture sensitivity rating, and operation up to +150 °C junction temperature - meeting requirements for engine control units, body control modules, and ADAS sensor interfaces exposed to thermal cycling and vibration.
How does the unidirectional configuration of SMAJ45AHE3/5A affect circuit placement?
The unidirectional configuration of SMAJ45AHE3/5A requires correct polarity orientation: the cathode (marked band) must connect to the line being protected, and the anode to ground. Reversal prevents clamping during positive transients and risks catastrophic failure. This differs from bidirectional variants (e.g., SMAJ45CA), which suppress both polarities without polarity constraints.
What is the maximum reverse leakage current specified for SMAJ45AHE3/5A at its stand-off voltage?
SMAJ45AHE3/5A specifies a maximum reverse leakage current (ID) of 1.0 μA at its 45 V stand-off voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage preserves power efficiency in always-on systems such as automotive telematics modules and battery-backed industrial sensors where quiescent current budgets are tightly constrained.
Can SMAJ45AHE3/5A be used in parallel for higher surge current handling?
No - SMAJ45AHE3/5A is not recommended for parallel operation due to VBR mismatch between units, which causes uneven current sharing and potential thermal runaway. For higher surge capability, select a single higher-rated device (e.g., SMBJ45AHE3/5A) or implement staged protection with upstream GDTs and downstream TVS arrays designed for coordinated clamping.
SMAJ45AHE3/5A 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 5.5A
- 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)
SMAJ45AHE3/5A FAQ
1.How can I place an order for SMAJ45AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45AHE3/5A 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 SMAJ45AHE3/5A reliable?
The price and inventory of SMAJ45AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ45AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ45AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45AHE3/5A?
SMAJ45AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45AHE3/5A 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 SMAJ45AHE3/5A?
For technical support, including SMAJ45AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45AHE3/5A requirements.
6.How does Aetrix verify that SMAJ45AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ45AHE3/5A 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 SMAJ45AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ45AHE3/5A?
All SMAJ45AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45AHE3/5A, 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 SMAJ45AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ45AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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