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Vishay General Semiconductor - Diodes Division SMAJ58CAHM3_A/H
- Part No.:
- SMAJ58CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ58CAHM3_A/H.pdf
- Description:
- TVS DIODE 58VWM 93.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ58CAHM3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features a 58 V standoff voltage (VWM), 64.4–71.2 V breakdown range (VBR at 1 mA), 93.6 V maximum clamping voltage (VC) at 4.3 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial electronics.
For engineers reviewing the SMAJ58CAHM3_A/H datasheet, SMAJ58CAHM3_A/H pinout, SMAJ58CAHM3_A/H application, or SMAJ58CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification (via HM3 suffix), halogen-free RoHS compliance, low thermal resistance (RθJL = 30 °C/W), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: during overvoltage events exceeding VWM = 58 V, it avalanches to limit voltage across protected circuitry to ≤93.6 V. Its bidirectional symmetry enables use on AC-coupled or floating lines without polarity concerns.
It delivers 400 W peak pulse power (derated to 300 W above 78 V), supports repetitive surge duty cycle of 0.01 %, and maintains stable clamping performance across -55 °C to +150 °C junction temperature range. The glass-passivated junction ensures consistent avalanche behavior and long-term reliability under surge stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 58 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown |
| VBR (min/max) | 64.4 V / 71.2 V at 1 mA - guaranteed avalanche initiation window; ensures predictable turn-on across production lot |
| VC @ IPPM | 93.6 V at 4.3 A - clamped voltage during 10/1000 μs surge; determines worst-case stress on downstream components |
| PPPM | 400 W - peak pulse power handling (10/1000 μs); defines transient energy absorption capacity per event |
| IFSM | 40 A - non-repetitive forward surge current (8.3 ms half-sine); supports unidirectional fault current tolerance |
| TJ max. | +150 °C - maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial environments |
| RθJL | 30 °C/W - junction-to-lead thermal resistance; allows effective heat dissipation through PCB copper traces without heatsink |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow). Matte tin-plated leads, solderable per J-STD-002/JESD 22-B102. Bidirectional construction - no polarity marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during positive transient | One side of symmetrical PN junction; conducts when voltage exceeds VBR in either polarity |
| Cathode | Current entry terminal during negative transient | Other side of symmetrical PN junction; enables bidirectional clamping without external polarity management |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC-coupled or floating signal lines (e.g., CAN bus, RS-485) without polarity-sensitive layout |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces |
| 400 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 surge events common in 12 V/24 V vehicle systems |
| Low RθJL = 30 °C/W | Permits direct thermal coupling to PCB copper, eliminating need for thermal vias or external heatsinks in space-constrained modules |
| Halogen-free & RoHS-compliant | Fulfills automotive OEM material compliance requirements (e.g., GMW3172, Ford WSS-M99P9999-A1) and EU environmental directives |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from load-dump and jump-start transients in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Shunt TVS diode placed between power rail and ground, triggered within <1 ps to clamp spikes up to 120 V. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V logic devices by limiting transient voltage to ≤93.6 V at 4.3 A. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog input modules in factory automation. IC Role / Device Role / Timing Role: Bidirectional voltage clamp on 0–10 V or 4–20 mA signal lines exposed to ESD and inductive switching noise. Use Value: Maintains signal integrity by suppressing transients while adding <1 pF capacitance - negligible impact on 1 kHz bandwidth signals. |
| Consumer USB Port ESD Protection | Telecom DSL Line Surge Suppression |
|
Use Scenario: Secondary-level ESD protection on USB 2.0 data lines (D+/D−) in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed after primary polymer-based TVS, absorbing residual 8 kV HBM surges. Use Value: Adds robustness against system-level IEC 61000-4-2 contact discharge without degrading 480 Mbps signal rise time. |
Use Scenario: Primary surge protection on twisted-pair DSL lines entering residential gateways, subjected to lightning-induced surges. IC Role / Device Role / Timing Role: High-energy shunt device mounted at line interface, clamping common-mode surges up to 6 kV (IEC 61000-4-5). Use Value: Handles 400 W peak pulse energy while maintaining VC ≤93.6 V - sufficient to prevent damage to ADSL transceiver front-end circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ58CAHE3_A/H | Same electrical specs, but RoHS-compliant commercial grade (non-AEC-Q101); uses standard tin plating instead of whisker-tested matte tin | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated | Select when cost sensitivity outweighs automotive qualification requirement and end-equipment does not require AEC-Q101 validation |
| SMBJ58CAHM3_A/H | Same VWM/VC, but SMB (DO-214AA) package - 25 % larger footprint, higher PPPM = 600 W, RθJL = 25 °C/W | Better thermal performance and surge margin; requires larger PCB area and different pad layout | Choose when higher surge endurance (>400 W) or improved thermal derating is needed, and board space permits SMB footprint |
Compared with SMAJ58CAHM3_A/H, SMAJ58CAHE3_A/H offers identical clamping performance without automotive qualification, while SMBJ58CAHM3_A/H provides greater surge headroom and thermal margin at the cost of increased board area - enabling trade-offs between qualification, reliability, and layout constraints.
Availability
SMAJ58CAHM3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, consumer USB peripherals, and telecom line cards requiring stable component supply with full traceability and lifecycle support.
Supply support for SMAJ58CAHM3_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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series targets high-reliability transient suppression in automotive, industrial, and communications systems - engineered for fast response, stable clamping, and robust surge endurance in harsh environments.
FAQ
What is the clamping voltage of SMAJ58CAHM3_A/H at its rated peak pulse current?
The SMAJ58CAHM3_A/H has a maximum clamping voltage (VC) of 93.6 V at its specified peak pulse current (IPPM) of 4.3 A, measured using the standardized 10/1000 μs double-exponential surge waveform. This value defines the upper voltage limit imposed on protected circuitry during a surge event and is guaranteed across the full operating temperature range of -55 °C to +150 °C. The SMAJ58CAHM3_A/H achieves this with low incremental surge resistance, ensuring minimal voltage overshoot beyond VC.
Is SMAJ58CAHM3_A/H qualified for automotive applications?
Yes, SMAJ58CAHM3_A/H is AEC-Q101 qualified, as confirmed by the "HM3" suffix in its ordering code - indicating halogen-free, RoHS-compliant construction with whisker-tested matte tin leads and full qualification per AEC-Q101 stress test requirements. This makes the SMAJ58CAHM3_A/H suitable for under-hood and cabin applications including body control modules, infotainment power supplies, and ADAS sensor interfaces where automotive-grade reliability is mandatory.
How does the bidirectional design of SMAJ58CAHM3_A/H affect its circuit implementation?
The bidirectional design of SMAJ58CAHM3_A/H eliminates polarity dependency, allowing it to be placed directly across any two nodes - such as signal-to-ground, differential pair, or AC power lines - without regard to voltage polarity. Unlike unidirectional TVS diodes, SMAJ58CAHM3_A/H has no cathode band marking and conducts symmetrically in both directions once VBR is exceeded. This simplifies PCB layout, reduces BOM count, and avoids misorientation risks during automated assembly - especially valuable in differential communication interfaces like CAN FD or RS-485.
What is the thermal resistance profile of SMAJ58CAHM3_A/H, and how does it impact PCB layout?
SMAJ58CAHM3_A/H has a typical junction-to-lead thermal resistance (RθJL) of 30 °C/W and junction-to-ambient (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads. The low RθJL means most surge energy is conducted directly into the PCB copper via the leads, making thermal vias or large copper pours highly effective. For reliable operation under repetitive surges, designers should follow Vishay's recommended pad layout - maximizing copper area connected to both terminals - to avoid junction temperature exceeding +150 °C during transient events.
Can SMAJ58CAHM3_A/H be used in place of a unidirectional TVS like SMAJ58A?
No - SMAJ58CAHM3_A/H is strictly bidirectional and cannot replace unidirectional devices like SMAJ58A in DC-biased circuits where reverse leakage must be minimized during normal operation. While both share identical VWM (58 V) and VC (93.6 V), the unidirectional SMAJ58A blocks reverse current until breakdown, whereas SMAJ58CAHM3_A/H conducts equally in both directions. Substitution would cause unintended conduction on negative excursions, potentially disrupting bias networks or damaging upstream sources. Always verify polarity requirements before selecting SMAJ58CAHM3_A/H.
SMAJ58CAHM3_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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ58CAHM3_A/H FAQ
1.How can I place an order for SMAJ58CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ58CAHM3_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 SMAJ58CAHM3_A/H reliable?
The price and inventory of SMAJ58CAHM3_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 SMAJ58CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ58CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ58CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ58CAHM3_A/H?
SMAJ58CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ58CAHM3_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 SMAJ58CAHM3_A/H?
For technical support, including SMAJ58CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ58CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ58CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ58CAHM3_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 SMAJ58CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ58CAHM3_A/H?
All SMAJ58CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ58CAHM3_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 SMAJ58CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ58CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ58CAHM3_A/H Tags
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