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Vishay General Semiconductor - Diodes Division SMAJ58AHM3/H
- Part No.:
- SMAJ58AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ58AHM3/H.pdf
- Description:
- TVS DIODE 58VWM 93.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,270
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Product details
Overview
SMAJ58AHM3/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 58 V standoff voltage (VWM), 64.4–71.2 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤93.6 V at 4.3 A peak pulse current (IPPM), with 400 W peak pulse power (10/1000 μs waveform). It is widely deployed in automotive power supply rails, industrial sensor interfaces, and DC-DC converter input stages.
For engineers reviewing the SMAJ58AHM3/H datasheet, SMAJ58AHM3/H pinout, SMAJ58AHM3/H application, or SMAJ58AHM3/H equivalent, this device is selected for high-reliability unidirectional surge suppression where AEC-Q101 qualification, low clamping voltage, and SMA (DO-214AC) surface-mount compatibility are critical design requirements.
Technical Context
The SMAJ58AHM3/H operates as a silicon avalanche diode that enters controlled breakdown when reverse voltage exceeds its VBR threshold, diverting surge energy away from downstream circuitry. Its unidirectional polarity-marked by a cathode band-enables integration into DC-biased lines without forward conduction during normal operation.
It delivers 400 W peak pulse power per 10/1000 μs waveform (derated to 300 W above 78 V), with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), enabling reliable operation up to +150 °C junction temperature. The device meets J-STD-020 MSL Level 1 and is halogen-free and RoHS-compliant per HM3 suffix designation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 58 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin. |
| VBR (min/max) | 64.4 V / 71.2 V at IT = 1 mA - Confirmed breakdown range ensures predictable turn-on across production lots. |
| VC @ IPPM | ≤93.6 V at 4.3 A - Clamping voltage under full-rated surge; determines maximum stress on protected ICs. |
| PPPM | 400 W (10/1000 μs) - Peak transient energy handling capacity; derates to 300 W above 78 V. |
| IFSM | 40 A (8.3 ms half-sine) - Surge current rating for unidirectional forward conduction during rare fault events. |
| TJmax | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and industrial enclosures. |
| Package | SMA (DO-214AC) - Standardized 2-pin surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal requirement. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1, 260 °C reflow peak. Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge return path | Connected to system ground or low-impedance return; carries full transient current during clamping. |
| Anode (unbanded end) | Protected line connection | Connected to the line being protected (e.g., 48 V rail); reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive powertrain and body electronics per stress test requirements (HTOL, TCT, ESD, etc.). |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance mandates for Tier-1 automotive and industrial OEMs without compromising reliability. |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) when properly laid out. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage overshoot during fast transients, reducing risk of latch-up or gate oxide damage in MOSFETs/ICs. |
| Fast response time (<1 ps) | Clamps within picoseconds of transient onset-faster than MOVs or polymer-based protectors-preserving signal integrity. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 48 V battery-fed ECUs against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground, acting as last-line clamp before DC-DC regulator. Use Value: Limits voltage excursions to ≤93.6 V during 400 W surges, preventing damage to 65 V-rated buck controllers and CAN transceivers. |
Use Scenario: Shielding 24 V analog sensor outputs (e.g., pressure, temperature) from ESD and inductive switching noise. IC Role / Device Role / Timing Role: TVS mounted at connector entry point, shunting transients before signal conditioning op-amps and ADC inputs. Use Value: Sub-100 V clamping ensures sensor output stays within common-mode range of precision instrumentation amplifiers. |
| Telecom DC Power Input Protection | Motor Drive Gate Driver Protection |
|
Use Scenario: Safeguarding PoE-powered equipment (e.g., IP cameras) from lightning-induced surges on 48 V DC input lines. IC Role / Device Role / Timing Role: Primary surge suppressor upstream of hot-swap controller and secondary TVS array. Use Value: 400 W rating handles repetitive surges per ITU-T K.21 Basic Protection Level without degradation. |
Use Scenario: Preventing gate oxide failure in high-side N-channel MOSFET drivers due to Miller-induced voltage spikes. IC Role / Device Role / Timing Role: TVS connected between gate and source, clamping dv/dt-induced overshoot during fast switching. Use Value: Fast response and low VC limit gate-source voltage to safe levels (< ±20 V), avoiding irreversible gate rupture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ58AHE3/H | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs HM3). | Lacks halogen-free certification required by some automotive Tier-1s and EU industrial programs. | Select SMAJ58AHM3/H when halogen-free compliance is mandated; otherwise SMAJ58AHE3/H offers cost parity. |
| SMBJ58A-H | Higher 600 W PPPM, larger SMB (DO-214AA) package, same VWM/VBR. | Requires PCB layout change; suited for higher-energy environments (e.g., heavy-duty motor controls). | Choose SMBJ58A-H only if surge energy exceeds 400 W; SMAJ58AHM3/H remains optimal for space-constrained 48 V systems. |
Compared with SMAJ58AHE3/H, SMAJ58AHM3/H adds halogen-free assurance without sacrificing performance; versus SMBJ58A-H, it trades peak power for compactness and automated assembly compatibility in dense layouts.
Availability
SMAJ58AHM3/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, and telecom DC input circuits requiring stable component supply, long-term lifecycle support, and AEC-Q101 traceability.
Supply support for SMAJ58AHM3/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, efficiency, and automotive-grade validation.
The SMAJ series was engineered for high-volume, space-constrained transient suppression in automotive and industrial power systems-delivering consistent clamping, AEC-Q101 qualification, and surface-mount manufacturability in the DO-214AC footprint.
FAQ
What is the clamping voltage of the SMAJ58AHM3/H under maximum rated surge current?
The SMAJ58AHM3/H clamps to a maximum of 93.6 V at its rated peak pulse current of 4.3 A (10/1000 μs waveform). This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during a full-rated transient event. Designers must ensure downstream components tolerate this clamped voltage with margin.
Is SMAJ58AHM3/H suitable for automotive applications?
Yes, SMAJ58AHM3/H is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials per Vishay's HM3 suffix designation. It is explicitly intended for automotive power rail protection-including 12 V, 24 V, and 48 V systems-and meets requirements for temperature cycling, humidity, and surge endurance in under-hood and body-control modules.
How does the SMAJ58AHM3/H differ from bidirectional variants like SMAJ58CA?
The SMAJ58AHM3/H is unidirectional and features a cathode band for polarity-sensitive placement on DC lines; SMAJ58CA is bidirectional with no polarity marking and symmetric clamping in both directions. SMAJ58AHM3/H is used where forward conduction must be blocked (e.g., positive supply rails), while SMAJ58CA suits AC-coupled or floating signal lines.
What is the thermal resistance and maximum junction temperature of SMAJ58AHM3/H?
The SMAJ58AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W, measured on 0.2" × 0.2" copper pads. Its maximum operating junction temperature is +150 °C, enabling use in high-temperature environments such as engine compartments and industrial control cabinets.
Does SMAJ58AHM3/H require a heatsink for standard surge duty cycles?
No external heatsink is required for single-event or low-duty-cycle surges (e.g., IEC 61000-4-5 testing), as the 10/1000 μs pulse duration limits total energy dissipation. However, PCB layout must provide minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve specified RθJA and prevent localized overheating during repetitive surges.
SMAJ58AHM3/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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 58V
- Voltage - Breakdown (Min):
- 64.4V
- Voltage - Clamping (Max) @ Ipp:
- 93.6V
- Current - Peak Pulse (10/1000µs):
- 4.3A
- 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)
SMAJ58AHM3/H FAQ
1.How can I place an order for SMAJ58AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ58AHM3/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 SMAJ58AHM3/H reliable?
The price and inventory of SMAJ58AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ58AHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ58AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ58AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ58AHM3/H?
SMAJ58AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ58AHM3/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 SMAJ58AHM3/H?
For technical support, including SMAJ58AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ58AHM3/H requirements.
6.How does Aetrix verify that SMAJ58AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ58AHM3/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 SMAJ58AHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ58AHM3/H?
All SMAJ58AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ58AHM3/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 SMAJ58AHM3/H part is unused and in its original packaging.
Return procedure for SMAJ58AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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