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Vishay General Semiconductor - Diodes Division SMAJ54AHE3/61
- Part No.:
- SMAJ54AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ54AHE3/61.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,779
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Product details
Overview
SMAJ54AHE3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection of sensitive electronics. It features a 54 V standoff voltage (VWM), 60.0–66.3 V breakdown range at 1 mA, 87.1 V maximum clamping voltage at 4.6 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed across power rails and I/O lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ54AHE3/61 datasheet, SMAJ54AHE3/61 pinout, SMAJ54AHE3/61 application, or SMAJ54AHE3/61 equivalent, key selection criteria include verified clamping performance under 4.6 A surge, AEC-Q101 qualification status, SMA (DO-214AC) package thermal resistance (RθJA = 120 °C/W), and unidirectional polarity marking for correct PCB orientation.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to divert transient energy away from downstream circuitry. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at 54 V), while the unidirectional configuration enables integration on DC-biased signal or supply lines without forward conduction concerns.
Designed for high-reliability environments, SMAJ54AHE3/61 meets MSL Level 1 per J-STD-020, supports 260 °C lead-free reflow, and is qualified to AEC-Q101 - confirming suitability for automotive powertrain and body electronics where transient immunity must survive repeated 10/1000 μs surges up to 400 W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC bias margin for protected line. |
| VBR @ IT=1 mA | 60.0–66.3 V - Verified avalanche onset range; ensures predictable turn-on within 10.5 % tolerance for design margining. |
| VC @ IPPM=4.6 A | 87.1 V - Clamped voltage during 10/1000 μs surge; limits stress on downstream ICs to ≤87.1 V under rated pulse. |
| PPPM | 400 W - Peak pulse power handling capability; sustains 4.6 A × 87.1 V transient without failure at TA = 25 °C. |
| IFSM | 40 A - 8.3 ms half-sine surge current rating; supports robustness against inductive switch-off events in motor drivers. |
| TJ max. | 150 °C - Maximum junction temperature; enables operation in under-hood automotive environments with derated power above 25 °C. |
| RθJA | 120 °C/W - Thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs board-level thermal design for sustained power dissipation. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band; 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 event. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or lower-potential rail; completes shunt path for clamping action. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment power supplies. |
| 400 W peak pulse power (10/1000 μs) | Handles ISO 7637-2 Pulse 1/2a/3a transients without degradation when mounted per recommended pad layout. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for 3.3 V/5 V logic interfaces. |
| MSL Level 1, 260 °C reflow compatible | Enables single-pass lead-free assembly without moisture sensitivity concerns or pre-bake requirements. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage current across temperature and lifetime stress conditions. |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power rails in vehicle body control modules against load dump and alternator ripple. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between VIN and GND, clamping spikes before they reach LDO input. Use Value: Limits voltage to ≤87.1 V during 400 W surges, preventing brownout or latch-up in MCU and CAN transceivers. |
Use Scenario: Safeguarding 4–20 mA current loop inputs in PLC analog input modules exposed to field wiring transients. IC Role / Device Role / Timing Role: Unidirectional TVS connected across loop terminals to clamp induced surges without affecting DC bias. Use Value: Maintains <1.0 μA leakage at 54 V, ensuring minimal impact on loop accuracy while suppressing >1 kV EFT bursts. |
| DC Motor Drive Gate Protection | Telecom Line Card Surge Protection |
Use Scenario: Shielding N-channel MOSFET gate drivers in brushed DC motor controllers from inductive kickback during PWM switching. IC Role / Device Role / Timing Role: Placed between gate and source to clamp negative-going spikes below -87.1 V and positive excursions above +54 V. Use Value: Fast response time and low clamping voltage prevent gate oxide damage and false turn-on during commutation noise. |
Use Scenario: Front-end protection for Ethernet PHY power pins in telecom base station line cards subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary TVS on 3.3 V/5 V supply rails feeding PHY ICs, coordinated with secondary MOV/GDT stages. Use Value: 40 A IFSM rating withstands repetitive 8.3 ms surges; AEC-Q101 qualification supports extended field life in harsh environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ54A-E3/61 | Same electrical specs and SMA package; lacks AEC-Q101 qualification and automotive traceability. | Approved for commercial/industrial use only; not suitable for automotive production programs. | Select SMAJ54AHE3/61 when AEC-Q101 compliance and automotive PPAP documentation are required. |
| SMCJ54AHE3/61 | Higher 1500 W PPPM, larger SMC (DO-214AB) package, same VWM/VC ratings. | Better suited for higher-energy transients (e.g., ISO 16750-2); requires larger PCB footprint and different thermal layout. | Choose SMAJ54AHE3/61 for space-constrained designs needing 400 W protection in minimal area; choose SMCJ54AHE3/61 for enhanced surge margin where board space allows. |
Compared with SMAJ54A-E3/61, SMAJ54AHE3/61 adds automotive-grade reliability and qualification; compared with SMCJ54AHE3/61, it trades peak power headroom for compact size and lower thermal mass - making it optimal for dense, cost-sensitive automotive modules requiring validated AEC-Q101 performance in SMA footprint.
Availability
SMAJ54AHE3/61 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom line card protection requiring stable component supply with full AEC-Q101 traceability and RoHS compliance.
Supply support for SMAJ54AHE3/61 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 validation.
The SMAJ series delivers standardized, AEC-Q101-qualified TVS diodes optimized for automotive and industrial transient suppression - balancing clamping performance, package scalability, and manufacturability in automated SMT lines.
FAQ
What is the clamping voltage of SMAJ54AHE3/61 at its rated peak pulse current?
The SMAJ54AHE3/61 has a maximum clamping voltage (VC) of 87.1 V at its rated peak pulse current (IPPM) of 4.6 A with a 10/1000 μs waveform. This value is measured under standard test conditions (TA = 25 °C, mounted on 0.2" × 0.2" copper pads) and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ54AHE3/61 maintains this clamping performance consistently due to its glass-passivated junction and controlled avalanche characteristics.
Is SMAJ54AHE3/61 qualified for automotive applications?
Yes, SMAJ54AHE3/61 is explicitly AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation in datasheet 88390. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and surge endurance - validating its use in automotive powertrain, chassis, and body electronics. The SMAJ54AHE3/61 meets all requirements for production deployment in vehicles where reliability under transient stress is mission-critical.
What is the standoff voltage rating of SMAJ54AHE3/61, and how does it relate to system design?
The SMAJ54AHE3/61 has a reverse standoff voltage (VWM) of 54 V, meaning it remains non-conductive up to this DC or RMS voltage level. In system design, VWM must exceed the maximum normal operating voltage of the protected line - for example, selecting SMAJ54AHE3/61 for a nominal 48 V automotive bus provides 6 V margin above typical regulation. This ensures no leakage-induced power loss or false triggering during steady-state operation, while still enabling rapid clamping when transients exceed 60.0 V.
Does SMAJ54AHE3/61 have polarity marking, and how is it oriented on the PCB?
Yes, SMAJ54AHE3/61 is unidirectional and features a cathode band on the SMA (DO-214AC) package - the banded end is the cathode terminal. During PCB layout, the cathode must be connected to the line being protected (e.g., VIN or signal line), while the anode (unbanded end) connects to ground or the reference rail. Incorrect orientation prevents clamping action and may result in catastrophic failure under reverse surge conditions. The SMAJ54AHE3/61 polarity marking is laser-etched and visible under standard optical inspection.
What is the thermal resistance of SMAJ54AHE3/61, and how does it affect power handling?
The SMAJ54AHE3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads per terminal. This value directly limits continuous power dissipation: at 25 °C ambient, the 3.3 W rated power (PD) raises junction temperature by 396 °C - hence derating is essential. For reliable operation, the SMAJ54AHE3/61 relies on short-duration transient dissipation rather than steady-state heating; its 400 W pulse rating assumes thermal mass absorbs energy without exceeding 150 °C junction limit.
SMAJ54AHE3/61 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)
SMAJ54AHE3/61 FAQ
1.How can I place an order for SMAJ54AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ54AHE3/61 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 SMAJ54AHE3/61 reliable?
The price and inventory of SMAJ54AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ54AHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ54AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ54AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ54AHE3/61?
SMAJ54AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ54AHE3/61 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 SMAJ54AHE3/61?
For technical support, including SMAJ54AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ54AHE3/61 requirements.
6.How does Aetrix verify that SMAJ54AHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ54AHE3/61 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 SMAJ54AHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ54AHE3/61?
All SMAJ54AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ54AHE3/61, 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 SMAJ54AHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ54AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ54AHE3/61 Tags
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