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Vishay General Semiconductor - Diodes Division SMAJ54AHE3/5A
- Part No.:
- SMAJ54AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ54AHE3/5A.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,499
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Product details
Overview
SMAJ54AHE3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 54 V standoff voltage (VWM), 60.0–66.3 V breakdown range at 1 mA, clamps transients to ≤87.1 V at 4.6 A peak pulse current, and delivers 400 W peak pulse power (10/1000 μs waveform). It is widely deployed to safeguard MOSFET gates, microcontroller I/O, and sensor interfaces against ESD and inductive switching surges in automotive and industrial control systems.
For engineers reviewing the SMAJ54AHE3/5A datasheet, SMAJ54AHE3/5A pinout, SMAJ54AHE3/5A application, or SMAJ54AHE3/5A equivalent, key selection criteria include its AEC-Q101 qualification, SMA (DO-214AC) package compatibility with automated placement, low incremental surge resistance, and precise clamping behavior under repetitive transient stress.
Technical Context
This TVS diode operates as a fast-acting shunt protector: under normal bias it presents <1.0 μA leakage at 54 V, but triggers within picoseconds when voltage exceeds its 60.0 V minimum breakdown threshold. Its glass-passivated junction ensures stable VBR temperature coefficient of +0.104 %/°C and supports continuous operation up to 150 °C junction temperature.
The device is rated for 40 A non-repetitive forward surge (8.3 ms half-sine), exhibits 120 °C/W junction-to-ambient thermal resistance on standard 5.0 mm × 5.0 mm copper pads, and maintains UL 497B recognition for telecom and industrial surge protection applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 54 V - Maximum continuous reverse operating voltage before significant conduction begins |
| VBR (Breakdown Voltage) | 60.0–66.3 V at 1.0 mA - Confirmed voltage range where device transitions into avalanche conduction |
| VC (Clamping Voltage) | ≤87.1 V at IPPM = 4.6 A - Peak voltage seen by protected circuit during 10/1000 μs transient |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Sustained transient energy absorption capability without failure |
| IFSM (Surge Current) | 40 A (8.3 ms half-sine) - Single-event forward surge rating for unidirectional operation |
| TJmax | 150 °C - Maximum allowable junction temperature for reliable long-term operation |
| Package | SMA (DO-214AC) - Standard surface-mount outline with cathode band marking and 0.064 g unit weight |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 (JEDEC J-STD-020), RoHS-compliant and AEC-Q101 qualified. Cathode indicated by band on body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts avalanche current to ground during overvoltage events |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path to complete clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock testing |
| 400 W peak pulse power | Enables protection against high-energy transients such as ISO 7637-2 Load Dump (up to 120 V) and IEC 61000-4-5 surges |
| Fast response time (<1 ps) | Clamps voltage spikes before sensitive downstream components (e.g., MCU GPIO, CAN transceivers) experience overstress |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during suppression, reducing risk of latch-up or gate oxide damage in MOSFETs |
| UL 497B recognition (QVGQ2) | Meets safety requirements for telecom and industrial signal-line protectors without additional certification burden |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between power rail and chassis ground. Use Value: Limits transient voltage to ≤87.1 V, preventing damage to 60 V-rated DC-DC converters and microcontrollers. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors in PLC modules from field-wiring induced surges. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) TVS placed at connector entry point before signal conditioning op-amp. Use Value: Maintains signal integrity while absorbing 400 W pulses without degrading sensor accuracy or introducing offset drift. |
| Consumer Device USB Port Protection | MOSFET Gate Driver Protection |
|
Use Scenario: Safeguarding USB 2.0 data lines and VBUS in portable medical monitors exposed to ESD per IEC 61000-4-2 ±15 kV contact discharge. IC Role / Device Role / Timing Role: Bidirectional variant not applicable; SMAJ54AHE3/5A used only on VBUS line due to unidirectional polarity. Use Value: Clamps VBUS to safe level within sub-nanosecond, preserving USB enumeration timing and preventing PHY latch-up. |
Use Scenario: Preventing gate oxide rupture in high-side N-channel MOSFETs driven by PWM controllers in motor drives. IC Role / Device Role / Timing Role: Placed between gate and source terminals to clamp Miller-induced voltage spikes during switching transitions. Use Value: Withstands 40 A surge current and clamps to ≤87.1 V, ensuring gate voltage stays within ±20 V absolute maximum rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ54A-E3/5A | Same electrical specs and SMA package; commercial-grade (non-AEC-Q101 qualified) | Lacks automotive qualification; suitable for industrial/commercial designs without automotive compliance needs | Select when AEC-Q101 is not required and cost sensitivity outweighs qualification assurance |
| SMAJ54AHM3/5A | Halogen-free, RoHS-compliant, AEC-Q101 qualified; identical VWM, VBR, and PPPM | Meets stricter environmental mandates (e.g., EU automotive OEM halogen-free requirements) | Choose for new automotive programs requiring halogen-free material declaration and full AEC-Q101 traceability |
Compared with SMAJ54AHE3/5A, the SMAJ54A-E3/5A offers identical protection performance without automotive qualification, while SMAJ54AHM3/5A adds halogen-free compliance-both serve as functionally aligned alternatives where specific regulatory or material constraints drive part selection.
Availability
SMAJ54AHE3/5A is available at Aetrix Electronics and suitable for automotive control units, industrial sensor nodes, and power supply front-end protection requiring stable component supply across multi-year production cycles.
Supply support for SMAJ54AHE3/5A 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, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom systems where robustness, fast response, and qualification compliance are mandatory.
FAQ
What is the clamping voltage of SMAJ54AHE3/5A at its rated peak pulse current?
The SMAJ54AHE3/5A clamps to a maximum of 87.1 V when subjected to its specified peak pulse current of 4.6 A (10/1000 μs waveform). This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during transient events, ensuring downstream components remain within safe operating limits.
Is SMAJ54AHE3/5A suitable for bidirectional signal line protection?
No, SMAJ54AHE3/5A is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. For bidirectional protection (e.g., RS-485, USB D+/D−), the SMAJ54CA family must be used. Using SMAJ54AHE3/5A on AC-coupled or symmetric signal lines risks forward conduction and improper clamping behavior.
Does SMAJ54AHE3/5A meet automotive qualification standards?
Yes, SMAJ54AHE3/5A is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation (Document Number: 88390, Revision: 09-Jan-2024). This qualification covers stress tests including temperature cycling, humidity, and mechanical shock-making it suitable for under-hood and chassis-mounted automotive applications.
What is the thermal resistance of SMAJ54AHE3/5A under standard PCB mounting?
The SMAJ54AHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes no additional heatsinking and directly impacts steady-state power dissipation limits-critical when evaluating long-term reliability in high-temperature environments.
How does the breakdown voltage tolerance of SMAJ54AHE3/5A affect circuit design margin?
SMAJ54AHE3/5A specifies a breakdown voltage range of 60.0 V to 66.3 V at 1 mA test current. Designers must ensure the minimum VBR (60.0 V) exceeds the system's maximum normal operating voltage (54 V VWM) by sufficient margin-typically ≥10 %-to prevent premature conduction during voltage tolerances or ripple, while the maximum VBR informs worst-case clamping headroom.
SMAJ54AHE3/5A 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):
- 54V
- Voltage - Breakdown (Min):
- 60V
- Voltage - Clamping (Max) @ Ipp:
- 87.1V
- Current - Peak Pulse (10/1000µs):
- 4.6A
- 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)
SMAJ54AHE3/5A FAQ
1.How can I place an order for SMAJ54AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ54AHE3/5A 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 SMAJ54AHE3/5A reliable?
The price and inventory of SMAJ54AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ54AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ54AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ54AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ54AHE3/5A?
SMAJ54AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ54AHE3/5A 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 SMAJ54AHE3/5A?
For technical support, including SMAJ54AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ54AHE3/5A requirements.
6.How does Aetrix verify that SMAJ54AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ54AHE3/5A 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 SMAJ54AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ54AHE3/5A?
All SMAJ54AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ54AHE3/5A, 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 SMAJ54AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ54AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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