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Vishay General Semiconductor - Diodes Division SMAJ54AHE3_A/H
- Part No.:
- SMAJ54AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ54AHE3_A/H.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ54AHE3_A/H from Vishay General Semiconductor is a unidirectional 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 AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power rails.
For engineers reviewing the SMAJ54AHE3_A/H datasheet, SMAJ54AHE3_A/H pinout, SMAJ54AHE3_A/H application, or SMAJ54AHE3_A/H equivalent, key selection criteria include its 54 V working voltage, 400 W peak pulse power rating (10/1000 μs), unidirectional polarity with cathode band marking, AEC-Q101 qualification status, and SMA package thermal resistance (RθJA = 120 °C/W).
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, conducting only when reverse voltage exceeds VBR to limit transient energy. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at VWM), while the SMA package supports automated SMT placement and meets MSL level 1 (260 °C reflow peak).
The device delivers 400 W peak pulse power per 10/1000 μs waveform up to 78 V; above that, derated to 300 W. Its clamping voltage of 87.1 V at 4.6 A provides predictable overvoltage protection, and its temperature coefficient of VBR is +0.104 %/°C - enabling accurate system-level surge margining across -55 °C to +150 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 60.0 V / 66.3 V at 1 mA - precise breakdown threshold defining clamping onset |
| VC @ IPPM | ≤87.1 V at 4.6 A - maximum clamped voltage during 10/1000 μs surge, critical for downstream IC survival |
| PPPM | 400 W - peak surge power handling capability under standard lightning-surge waveform |
| IFSM | 40 A - 8.3 ms half-sine surge current rating for unidirectional forward conduction events |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| RθJA | 120 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads. Cathode indicated by a band on one end; anode is unmarked.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VREV > VBR |
| Anode (unbanded end) | Reference node | Typically tied to ground or low-impedance return path; completes clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive powertrain and body electronics per stress test requirements |
| 400 W peak pulse power (10/1000 μs) | Robust protection against ISO 7637-2 pulse 1, 2a, 3a/b, and IEC 61000-4-5 surges |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., inductive switch-off) |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns |
| Glass passivated junction | Ensures stable VBR, low leakage (<1 μA), and long-term reliability in humid environments |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Parallel-connected clamping device absorbing surge energy before it reaches MCU or CAN transceiver inputs. Use Value: Limits voltage to ≤87.1 V during 4.6 A surges, preventing latch-up or gate oxide damage in downstream 5 V/3.3 V logic. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF) shunt clamp placed at connector entry point. Use Value: Sub-1 ns response time preserves signal integrity while suppressing ±8 kV contact ESD per IEC 61000-4-2. |
| DC-DC Converter Input Protection | MOSFET Gate Driver Protection |
Use Scenario: Safeguarding buck converter input stages against reverse-polarity connection and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and ground, rated for 54 V nominal system voltage. Use Value: Withstands 40 A non-repetitive forward surge (IFSM), covering worst-case reverse-battery fault currents. | Use Scenario: Preventing gate oxide failure in high-side N-channel MOSFET drivers exposed to Miller-induced spikes. IC Role / Device Role / Timing Role: Clamp placed between gate and source to limit VGS excursion during switching transitions. Use Value: Precise 60–66.3 V VBR ensures clamping activates before 20 V absolute maximum VGS rating is exceeded. |
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, RoHS-compliant commercial grade (non-AEC-Q101) | Lacks automotive qualification; unsuitable for AEC-critical systems | Select when cost-sensitive industrial designs do not require automotive reliability validation |
| SMBJ54AHE3_A/H | Same VWM/VBR/VC, but SMB (DO-214AA) package - 20 % larger footprint, lower RθJA (90 °C/W) | Better thermal performance but requires PCB layout change; higher surge current (5.2 A) | Choose when higher power derating margin or improved thermal dissipation is required |
Compared with SMAJ54AHE3_A/H, SMAJ54A-E3/61 offers identical clamping performance without AEC-Q101 validation, while SMBJ54AHE3_A/H delivers enhanced thermal robustness and 13 % higher IPPM in a larger package - enabling longer surge duration tolerance in high-ambient-temperature environments.
Availability
SMAJ54AHE3_A/H is available at Aetrix Electronics and suitable for automotive control units, industrial sensor nodes, and DC-DC converter input stages requiring stable component supply with AEC-Q101 assurance and consistent surge immunity performance.
Supply support for SMAJ54AHE3_A/H 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, precision, and application-specific qualification.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where repeatable clamping, low leakage, and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMAJ54AHE3_A/H at its rated peak pulse current?
The SMAJ54AHE3_A/H has a maximum clamping voltage (VC) of 87.1 V when subjected to its rated peak pulse current of 4.6 A under the standardized 10/1000 μs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - a critical parameter for ensuring downstream ICs remain within safe operating voltage margins. The SMAJ54AHE3_A/H achieves this clamping performance while maintaining low leakage and stable breakdown characteristics across temperature.
Is SMAJ54AHE3_A/H suitable for automotive applications?
Yes, SMAJ54AHE3_A/H is explicitly AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation. It meets stress testing requirements for automotive-grade reliability including temperature cycling, humidity bias, and surge endurance. Its 54 V standoff voltage aligns with 12 V system architectures, and its 87.1 V clamping voltage protects CAN transceivers, MCUs, and power management ICs in engine control, body electronics, and ADAS modules. The SMAJ54AHE3_A/H is intended for use in non-safety-critical but reliability-demanding automotive subsystems.
What is the package type and mounting configuration of SMAJ54AHE3_A/H?
SMAJ54AHE3_A/H uses the SMA (DO-214AC) surface-mount package - a compact, low-profile outline measuring 4.93 mm × 3.99 mm × 2.29 mm with matte tin-plated leads. It is mounted using standard reflow soldering on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, achieving a typical junction-to-ambient thermal resistance of 120 °C/W. The cathode is marked by a visible band; polarity must be observed during placement to ensure correct clamping direction. The SMAJ54AHE3_A/H is compatible with automated pick-and-place equipment and meets MSL Level 1 handling requirements.
How does SMAJ54AHE3_A/H differ from bidirectional TVS diodes like SMAJ54CA?
SMAJ54AHE3_A/H is unidirectional and functions only during reverse-voltage transients - conducting from cathode to anode when VREV > VBR. In contrast, SMAJ54CA is bidirectional and clamps symmetrically in both polarities, making it suitable for AC lines or differential data paths. The SMAJ54AHE3_A/H exhibits lower leakage (<1.0 μA at 54 V) and avoids forward conduction on positive transients, whereas SMAJ54CA has identical VBR in both directions but double the leakage spec (≤2.0 μA). Designers select SMAJ54AHE3_A/H for DC power rails where polarity is fixed and leakage minimization is critical.
What is the peak pulse power rating of SMAJ54AHE3_A/H and how is it applied in circuit design?
SMAJ54AHE3_A/H is rated for 400 W peak pulse power with a 10/1000 μs waveform - a standard lightning-surge test profile defined in IEC 61000-4-5. This rating applies up to 78 V; above that, it is derated to 300 W. In circuit design, this value determines the maximum transient energy the device can absorb without failure, guiding selection of upstream fusing, PCB trace width, and layout spacing. For example, a 4.6 A surge at 87.1 V yields ~400 W instantaneous power - confirming the SMAJ54AHE3_A/H operates within its safe operating area when protecting 12 V/24 V systems against ISO 7637-2 pulses.
SMAJ54AHE3_A/H 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:
- -
- 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_A/H FAQ
1.How can I place an order for SMAJ54AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ54AHE3_A/H 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_A/H reliable?
The price and inventory of SMAJ54AHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ54AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ54AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ54AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ54AHE3_A/H?
SMAJ54AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ54AHE3_A/H 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_A/H?
For technical support, including SMAJ54AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ54AHE3_A/H requirements.
6.How does Aetrix verify that SMAJ54AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ54AHE3_A/H 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_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ54AHE3_A/H?
All SMAJ54AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ54AHE3_A/H, 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_A/H part is unused and in its original packaging.
Return procedure for SMAJ54AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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