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Vishay General Semiconductor - Diodes Division SMAJ54CAHM3/H
- Part No.:
- SMAJ54CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ54CAHM3/H.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,612
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Product details
Overview
SMAJ54CAHM3/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 54 V standoff voltage (VWM), 60.0–66.3 V breakdown range (VBR), and clamps transients to ≤87.1 V at 4.6 A peak pulse current (IPPM), with 400 W peak pulse power (10/1000 μs waveform). It is used in automotive sensor signal lines, industrial I/O ports, and telecom interface protection where AEC-Q101-qualified reliability is required.
For engineers reviewing the SMAJ54CAHM3/H datasheet, SMAJ54CAHM3/H pinout, SMAJ54CAHM3/H application, or SMAJ54CAHM3/H equivalent, this device delivers verified bidirectional clamping performance, halogen-free RoHS compliance, and MSL Level 1 moisture sensitivity - critical for high-reliability PCB assembly and automotive-grade ESD/surge resilience validation.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional CA construction, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<1.0 μA at VWM), while the DO-214AC (SMA) package supports automated placement and meets UL 94 V-0 flammability.
Thermal design is constrained by RθJA = 120 °C/W and TJ(max) = 150 °C, requiring copper pad thermal relief per Vishay's recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) layout. The device sustains repetitive 0.01% duty-cycle surges up to 400 W below 78 V, derating linearly above that threshold to 300 W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing margin. |
| VBR (min/max) | 60.0 V / 66.3 V at 1.0 mA - Confirmed breakdown range ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | ≤87.1 V at 4.6 A - Clamping voltage under 10/1000 μs surge defines worst-case stress on downstream ICs. |
| PPPM | 400 W (10/1000 μs) - Peak transient energy absorption capacity; derates to 300 W above 78 V. |
| IDRM | <1.0 μA at 54 V - Ultra-low reverse leakage preserves signal integrity in high-impedance sensor or analog circuits. |
| TJ(max) | +150 °C - Maximum junction temperature enables operation in under-hood automotive or industrial enclosures. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 3.99 mm × 4.50 mm footprint and 2.29 mm height. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, qualified to JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | One terminal of symmetrical PN junction; accepts surge current from either direction during clamping. |
| Cathode | Transient current entry (bidirectional) | Second terminal of symmetrical PN junction; completes low-impedance path to ground or rail during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment interfaces. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets environmental compliance requirements for global OEM supply chains without compromising surge robustness. |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-to-earth) when properly laid out on 5 mm × 5 mm copper pads. |
| MSL Level 1 (JEDEC J-STD-020) | Zero floor life limitation - can be stored indefinitely at ambient conditions prior to reflow soldering. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a/5a), improving system-level immunity. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching spikes in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector or IC input pins to shunt surge energy before it reaches signal conditioning circuitry. Use Value: Maintains signal fidelity under ISO 16750-2 load dump (up to 170 V) and suppresses ESD per ISO 10605 (±30 kV air, ±25 kV contact) without degrading bandwidth. |
Use Scenario: Safeguarding 24 V DC digital input modules in programmable logic controllers against field-wiring transients and relay coil flyback. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected between input line and common rail to limit voltage excursion during 100 V/1 s surges per IEC 61000-4-4. Use Value: Enables >100,000 surge cycles without parameter shift, supporting long-life industrial deployment with minimal maintenance. |
| Telecom Interface Protection | Consumer Power Adapter EMI Filtering |
|
Use Scenario: Shielding RS-485/RS-232 transceivers and Ethernet PHYs in base stations and network edge devices from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: First-line transient suppressor in series with common-mode chokes, clamping differential and common-mode overvoltages simultaneously. Use Value: Achieves <1 ns response time and <10 pF junction capacitance (at 0 V), preserving signal integrity up to 25 Mbps without added jitter. |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters and USB PD chargers to prevent damage from output capacitor failure or feedback loop loss. IC Role / Device Role / Timing Role: Clamp device across regulated 5 V/9 V/12 V output rails to absorb energy from unregulated overshoot events. Use Value: Limits output rail excursion to ≤87.1 V during 400 W transients, protecting downstream USB-C controllers and battery management ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ54CAHE3/H | Same electrical specs and package, but RoHS-compliant (non-halogen-free) and commercial-grade only - lacks AEC-Q101 qualification. | Approved for consumer/industrial use only; not certified for automotive under-hood or safety-critical systems. | Select when cost sensitivity outweighs automotive qualification requirements and halogen-free material is not mandated. |
| SMBJ54CAHM3 | Higher 600 W peak pulse power rating, same VWM/VC, but larger SMB (DO-214AA) package (4.57 mm × 3.94 mm). | Offers greater surge margin for harsh environments (e.g., railway signaling), but requires PCB layout change. | Choose when system-level surge testing exceeds 400 W and board space allows SMB footprint. |
Compared with SMAJ54CAHE3/H, the SMAJ54CAHM3/H adds halogen-free compliance and AEC-Q101 qualification without sacrificing clamping performance; versus SMBJ54CAHM3, it trades 200 W pulse headroom for smaller SMA footprint and identical mounting compatibility.
Availability
SMAJ54CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom interface surge resilience requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ54CAHM3/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, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMAJ series targets high-volume, high-reliability transient suppression in automotive, industrial, and communications infrastructure - engineered for rapid response, repeatable clamping, and seamless SMT integration.
FAQ
What is the maximum clamping voltage of the SMAJ54CAHM3/H under a standard 10/1000 μs surge?
The SMAJ54CAHM3/H clamps to a maximum of 87.1 V when subjected to its rated peak pulse current of 4.6 A (10/1000 μs waveform). This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ54CAHM3/H maintains this clamping performance across its full operating temperature range (−55 °C to +150 °C) and after repeated surge exposure.
Is SMAJ54CAHM3/H suitable for automotive applications requiring AEC-Q101 qualification?
Yes, SMAJ54CAHM3/H is explicitly AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation (Document Number: 88390, Revision: 09-Jan-2024). It is approved for use in automotive subsystems including body electronics, ADAS sensors, and powertrain interfaces where validated reliability under thermal cycling, humidity, and mechanical shock is mandatory. The SMAJ54CAHM3/H meets all stress test requirements defined in AEC-Q101 Rev D.
How does the halogen-free construction of SMAJ54CAHM3/H impact its thermal performance?
The halogen-free molding compound in SMAJ54CAHM3/H has no measurable effect on thermal resistance - RθJA remains 120 °C/W and RθJL stays at 30 °C/W, identical to halogen-containing variants. Vishay validates thermal performance independently of halogen content, and the SMAJ54CAHM3/H achieves the same 150 °C maximum junction temperature and derating curve as specified in Figure 2 of the datasheet.
Can SMAJ54CAHM3/H replace SMAJ54A in a bidirectional protection circuit?
No - SMAJ54A is unidirectional and requires correct cathode orientation; SMAJ54CAHM3/H is bidirectional with no polarity marking and symmetric clamping behavior. Substituting SMAJ54CAHM3/H for SMAJ54A in an existing unidirectional layout may cause improper clamping on positive transients if the original design relies on forward conduction. Always verify circuit topology: SMAJ54CAHM3/H is only a direct replacement for other CA-suffix (bidirectional) variants like SMAJ54CAHE3/H.
What is the reverse leakage current specification for SMAJ54CAHM3/H at its rated standoff voltage?
At VWM = 54 V and TA = 25 °C, the SMAJ54CAHM3/H exhibits a maximum reverse leakage current (IDRM) of 1.0 μA. This ultra-low leakage ensures minimal power loss and signal distortion in high-impedance monitoring circuits, such as those found in precision sensor front-ends or battery-powered IoT nodes. Leakage remains below 5.0 μA up to 85 °C ambient, per Vishay's thermal derating data.
SMAJ54CAHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ54CAHM3/H FAQ
1.How can I place an order for SMAJ54CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ54CAHM3/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 SMAJ54CAHM3/H reliable?
The price and inventory of SMAJ54CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ54CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ54CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ54CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ54CAHM3/H?
SMAJ54CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ54CAHM3/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 SMAJ54CAHM3/H?
For technical support, including SMAJ54CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ54CAHM3/H requirements.
6.How does Aetrix verify that SMAJ54CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ54CAHM3/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 SMAJ54CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ54CAHM3/H?
All SMAJ54CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ54CAHM3/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 SMAJ54CAHM3/H part is unused and in its original packaging.
Return procedure for SMAJ54CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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