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Vishay General Semiconductor - Diodes Division SMAJ54AHM3_A/I
- Part No.:
- SMAJ54AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ54AHM3_A/I.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ54AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 54 V standoff voltage (VWM), 60.0–66.3 V breakdown voltage (VBR) at 1 mA, 4.6 A peak pulse current (IPPM), and clamps to ≤87.1 V under 10/1000 μs surge. It is used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power rails.
For engineers reviewing the SMAJ54AHM3_A/I datasheet, SMAJ54AHM3_A/I pinout, SMAJ54AHM3_A/I application, or SMAJ54AHM3_A/I equivalent, key selection criteria include unidirectional polarity, 400 W peak pulse power rating (at ≤78 V), AEC-Q101 qualification status, halogen-free RoHS compliance, and thermal resistance (RθJA = 120 °C/W) for PCB-level thermal design.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, entering avalanche conduction when reverse voltage exceeds VBR. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at VWM), while its low incremental surge resistance enables effective transient energy diversion during 10/1000 μs surges.
The SMAJ54AHM3_A/I is rated for 400 W peak pulse power (derated above TA = 25 °C), supports 40 A non-repetitive forward surge current (IFSM), and maintains operation across –55 °C to +150 °C junction temperature range. Its MSL Level 1 rating confirms suitability for standard reflow processes without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR (min/max) | 60.0 V / 66.3 V at IT = 1 mA - Confirmed breakdown window ensures predictable turn-on threshold under surge conditions. |
| VC @ IPPM | ≤87.1 V at 4.6 A - Clamping voltage limits stress on downstream components during standardized 10/1000 μs transient events. |
| PPPM | 400 W - Peak pulse power handling capacity for short-duration transients; derates linearly above 25 °C ambient. |
| IFSM | 40 A - Withstands 8.3 ms half-sine surge without failure; critical for inductive load switching protection. |
| TJ max. | +150 °C - Enables reliable operation in under-hood automotive and high-temperature industrial environments. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs heatsinking requirements. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking; 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 lower-potential rail; completes clamping path during reverse-biased surge. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 3/4 surges without derating penalties below 78 V. |
| AEC-Q101 qualified | Validated for automotive powertrain and body electronics applications requiring zero-failure reliability under thermal cycling and vibration. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets global environmental regulations and eliminates corrosive halogen emissions during PCB reflow or end-of-life incineration. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free assembly without moisture sensitivity concerns or baking requirements. |
| Glass passivated junction | Ensures stable VBR tolerance, low leakage (<1.0 μA), and long-term parameter stability under thermal stress. |
Applications
| Automotive Power Rail 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 clamping TVS placed between power input and ground, responding within <1 ns to suppress spikes up to 100 V. Use Value: Limits voltage seen by downstream LDOs and microcontrollers to ≤87.1 V, preventing latch-up or oxide damage during ISO 7637-2 Pulse 5a events. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC I/O modules. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on 4–20 mA or 0–10 V signal lines exposed to ESD and field wiring surges. Use Value: Clamps induced transients to <87.1 V while maintaining <1.0 μA leakage at 54 V, preserving signal integrity and ADC accuracy. |
| DC-DC Converter Input Stage | MOSFET Gate Driver Protection |
|
Use Scenario: Shielding buck converter inputs from back-EMF and hot-swap transients in telecom power supplies. IC Role / Device Role / Timing Role: Primary-side TVS absorbing repetitive 400 W pulses during startup and fault recovery cycles. Use Value: Sustains 400 W peak power without degradation, enabling >100,000 surge cycles per JEDEC JESD22-A114E testing. |
Use Scenario: Preventing gate oxide rupture in high-side N-channel MOSFETs driven by PWM controllers. IC Role / Device Role / Timing Role: Low-capacitance clamping device across gate-source terminals to shunt Miller-induced voltage spikes. Use Value: Fast response (<1 ns) and low VC ensure gate voltage stays within ±20 V absolute maximum rating during fast switching transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ54AHE3_A/I | Same electrical specs, but RoHS-compliant (E3) instead of halogen-free (HM3); no AEC-Q101 qualification. | Approved for commercial/industrial use only; not certified for automotive under-hood deployment. | Select when halogen-free requirement is waived and AEC-Q101 is unnecessary. |
| SMAJ54A-M3/5A | Identical TVS parameters; differs only in packaging format (13" reel, 7500 pcs) and base P/N suffix (-M3). | No functional difference; same halogen-free and RoHS compliance, but lacks explicit AEC-Q101 marking in ordering code. | Choose for high-volume production where tape-and-reel logistics favor 13" reels and documentation does not require AEC-Q101 traceability. |
Compared with SMAJ54AHM3_A/I, the SMAJ54AHE3_A/I omits halogen-free and AEC-Q101 assurance-critical for automotive OEMs-while SMAJ54A-M3/5A provides identical protection performance but with less stringent qualification documentation for volume manufacturing.
Availability
SMAJ54AHM3_A/I is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, and DC-DC converter input stage surge suppression requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMAJ54AHM3_A/I 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific validation.
The SMAJ series was developed for high-reliability transient suppression in space-constrained, thermally demanding environments-including automotive, industrial, and telecom infrastructure-where consistent clamping and long-term parametric stability are mandatory.
FAQ
What is the maximum clamping voltage of the SMAJ54AHM3_A/I under a 10/1000 μs surge?
The SMAJ54AHM3_A/I has a maximum clamping voltage (VC) of 87.1 V at its rated peak pulse current (IPPM) of 4.6 A under the standardized 10/1000 μs waveform. This value is guaranteed per Vishay's datasheet revision 09-Jan-2024 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ54AHM3_A/I achieves this clamping performance while maintaining low leakage and fast response time.
Is the SMAJ54AHM3_A/I qualified for automotive applications?
Yes, the SMAJ54AHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure (HM3 suffix with "_A/I" revision) and documentation in the SMAJ5.0A–SMAJ188CA datasheet. This qualification validates its reliability for automotive powertrain, body control, and ADAS subsystems subjected to thermal cycling, mechanical shock, and humidity testing. The SMAJ54AHM3_A/I meets all stress test requirements defined in AEC-Q101 Rev D.
What is the standoff voltage (VWM) and why is it important for SMAJ54AHM3_A/I selection?
The standoff voltage (VWM) of the SMAJ54AHM3_A/I is 54 V - the maximum continuous reverse voltage it can withstand without significant leakage or clamping action. This parameter ensures compatibility with 48 V nominal systems and 12 V/24 V automotive rails with margin for ripple and transients. Selecting a VWM ≥110 % of normal operating voltage prevents false triggering while retaining headroom for surge suppression. The SMAJ54AHM3_A/I's 54 V VWM aligns precisely with this design rule.
Does the SMAJ54AHM3_A/I have halogen-free construction?
Yes, the "HM3" suffix in SMAJ54AHM3_A/I explicitly denotes halogen-free, RoHS-compliant construction per Vishay's material categorization standards. The molding compound contains no brominated or chlorinated flame retardants, and terminal plating uses matte tin without lead or halogen additives. This satisfies IPC-1752A Class 3 reporting requirements and supports environmentally regulated markets including EU automotive and industrial equipment.
What is the thermal resistance (RθJA) of the SMAJ54AHM3_A/I and how does it affect PCB layout?
The SMAJ54AHM3_A/I 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 directly impacts PCB copper area allocation: reducing pad size or omitting thermal vias increases RθJA, risking junction overheating during repetitive surges. For sustained reliability, designers should maintain minimum pad dimensions and add ≥4 thermal vias per pad when using the SMAJ54AHM3_A/I in high-duty-cycle applications.
SMAJ54AHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ54AHM3_A/I FAQ
1.How can I place an order for SMAJ54AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ54AHM3_A/I 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 SMAJ54AHM3_A/I reliable?
The price and inventory of SMAJ54AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ54AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ54AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ54AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ54AHM3_A/I?
SMAJ54AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ54AHM3_A/I 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 SMAJ54AHM3_A/I?
For technical support, including SMAJ54AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ54AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ54AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ54AHM3_A/I 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 SMAJ54AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ54AHM3_A/I?
All SMAJ54AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ54AHM3_A/I, 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 SMAJ54AHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ54AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ54AHM3_A/I Tags
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