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Vishay General Semiconductor - Diodes Division SMA5J40CAHM3/H
- Part No.:
- SMA5J40CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J40CAHM3/H.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMA5J40CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on signal and power lines. It features 40 V stand-off voltage (VWM), 49.1 V maximum breakdown voltage (VBR), 64.5 V clamping voltage (VC) at 7.8 A peak pulse current (IPPM), and 500 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMA5J40CAHM3/H datasheet, SMA5J40CAHM3/H pinout, SMA5J40CAHM3/H application, or SMA5J40CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (RθJA = 80 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped crowbar during transients, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its bidirectional symmetry ensures identical electrical characteristics in both polarities, with clamping performance validated under 10/1000 μs surge waveforms per ANSI/IEEE C62.35.
The SMA5J40CAHM3/H is rated for -55 °C to +150 °C junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102. Its thermal design relies on PCB copper pad area for heat dissipation, with RθJL = 25 °C/W to lead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC signal line operating margin. |
| VBR (min/max) | 44.4 V / 49.1 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold across production lot. |
| VC @ IPPM | 64.5 V at 7.8 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream ICs like microcontrollers or transceivers. |
| PPPM | 500 W - Peak pulse power handling capability; enables protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) when properly mounted. |
| TJ max. | +150 °C - Maximum junction temperature rating; supports operation in under-hood automotive environments and industrial enclosures. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm × 4.50 mm footprint; compatible with standard pick-and-place equipment and reflow profiles. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing; ordering code suffix HM3 denotes qualification. |
Pinout & Package
SMA5J40CAHM3/H is housed in an SMA (DO-214AC) surface-mount package with two terminals: no polarity marking for bidirectional operation. The case is molded with UL 94 V-0 flammability-rated compound, and terminals are matte tin-plated for solderability per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (unmarked) | Bidirectional transient conduction path | No cathode band; symmetrical conduction in either direction - simplifies PCB layout and eliminates orientation errors during assembly. |
| Case (body) | Thermal and mechanical interface | Non-electrical; transfers heat to PCB copper pads - requires minimum 5.0 mm × 5.0 mm copper area per terminal for rated PPPM performance. |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free, RoHS-compliant construction | Meets global environmental regulations without compromising surge robustness or thermal stability - required for Tier 1 automotive supply chains. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a), improving protection margin for 3.3 V or 5 V logic interfaces. |
| MSL Level 1 moisture sensitivity | Enables use without dry-pack or baking prior to reflow - reduces manufacturing overhead and avoids moisture-induced popcorning defects. |
| Excellent clamping ratio (VC/VBR ≈ 1.31) | Indicates tight voltage control during surge events - critical for protecting low-voltage ASICs and precision analog front-ends. |
Applications
| Automotive Sensor Interface | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protecting CAN/LIN bus nodes and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and ground, responding within <1 ns to divert surge energy away from MCU ADC inputs or transceiver pins. Use Value: Maintains signal integrity during 12 V/24 V system transients up to 500 W, enabling AEC-Q101-compliant designs without additional filtering components. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Standoff-mode protector that remains non-conductive below 40 V but clamps to ≤64.5 V during 10/1000 μs surges exceeding 40 V. Use Value: Eliminates need for series resistors or RC networks while sustaining >100,000 surge cycles - reducing BOM count and board space in DIN-rail mounted controllers. |
| Telecom Line Card Protection | Consumer Appliance Motor Control |
Use Scenario: Shielding Ethernet PHY interfaces and RS-485 transceivers on telecom access equipment from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary-level TVS placed at connector entry point, coordinating with secondary GDT or polymer PTC for multi-stage protection architecture. Use Value: Withstands repeated 4 kV contact discharge (IEC 61000-4-2) and 2 kV ring wave (IEC 61000-4-5), preserving data link uptime in outdoor cabinets. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machines, HVAC blowers, and power tools. IC Role / Device Role / Timing Role: Parallel-connected transient absorber across motor terminals or H-bridge outputs, conducting only during voltage excursions above 40 V. Use Value: Prevents latch-up and gate oxide damage in MOSFET drivers by limiting transient peaks to 64.5 V - extending field failure MTBF beyond 10 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J40CAHE3/H | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification; uses SnPb-free matte tin plating without halogen restriction. | Acceptable where halogen-free mandate is absent (e.g., non-EU commercial industrial gear); identical thermal and surge performance. | Select SMA5J40CAHE3/H if halogen-free certification is not required and cost optimization is prioritized. |
| SMB5J40CAHM3 | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package - 5.3 mm × 4.1 mm vs. SMA's 5.28 mm × 4.50 mm; 600 W PPPM rating (vs. 500 W). | Offers higher power handling and slightly larger pad area; suitable for designs needing margin beyond 500 W or legacy SMB footprints. | Choose SMB5J40CAHM3 when board layout allows larger footprint and surge margin >500 W is required - not drop-in compatible due to different land pattern. |
Compared with SMA5J40CAHM3/H, SMA5J40CAHE3/H provides identical protection performance without halogen-free compliance, while SMB5J40CAHM3 delivers 20 % higher peak power in a physically larger package - requiring PCB redesign but offering extended surge endurance in high-risk environments.
Availability
SMA5J40CAHM3/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC input protection, and telecom line card surge hardening requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for SMA5J40CAHM3/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, power density, and application-specific qualification.
The SMA5JxxCA family was engineered for high-power-density transient suppression in space-constrained automotive and industrial systems - delivering 500 W surge capability in the compact SMA package with AEC-Q101 and halogen-free compliance built-in.
FAQ
What is the clamping voltage of SMA5J40CAHM3/H at its rated peak pulse current?
The SMA5J40CAHM3/H has a maximum clamping voltage (VC) of 64.5 V at 7.8 A peak pulse current (IPPM), measured under standardized 10/1000 μs waveform conditions. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed in Vishay's datasheet Document Number 88875, page 2. The SMA5J40CAHM3/H maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMA5J40CAHM3/H suitable for automotive applications?
Yes, SMA5J40CAHM3/H is AEC-Q101 qualified and explicitly designated for automotive use, as indicated by the "HM3" suffix denoting halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. It is deployed in engine control units, body control modules, and ADAS sensor interfaces where robust transient immunity and long-term reliability under thermal cycling are mandatory. The SMA5J40CAHM3/H meets all stress tests defined in the AEC-Q101 standard, including HTGB, HTRB, and TCT.
What does the "CA" suffix mean in SMA5J40CAHM3/H?
The "CA" suffix in SMA5J40CAHM3/H indicates a bidirectional configuration - meaning the device provides symmetrical transient suppression in both forward and reverse directions, with identical VBR, VC, and IPPM values regardless of polarity. This eliminates the need for polarity-aware layout and simplifies protection of AC-coupled or differential signal lines. Unidirectional variants use "A" alone (e.g., SMA5J40AHM3/H), with cathode marking and forward conduction behavior.
What is the thermal resistance of SMA5J40CAHM3/H, and how does it affect layout?
The SMA5J40CAHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes optimal PCB copper area; reducing pad size increases RθJA and degrades surge power derating. Layout must allocate ≥5.0 mm × 5.0 mm copper per terminal and avoid thermal isolation - otherwise, the SMA5J40CAHM3/H may exceed TJ max. of +150 °C during repetitive surges.
How does SMA5J40CAHM3/H differ from SMA5J40AHM3/H?
SMA5J40CAHM3/H is bidirectional with symmetrical clamping in both polarities and no polarity marking, whereas SMA5J40AHM3/H is unidirectional with a cathode band and conducts only in reverse bias. Their VWM (40 V), VBR (44.4–49.1 V), and PPPM (500 W) are identical, but SMA5J40AHM3/H specifies VF = 3.5 V at 25 A forward current - a parameter irrelevant to SMA5J40CAHM3/H. Use SMA5J40CAHM3/H for AC signals or polarity-agnostic protection; choose SMA5J40AHM3/H for DC rails where forward conduction must be blocked.
SMA5J40CAHM3/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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 7.8A
- Power - Peak Pulse:
- 500W
- 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)
SMA5J40CAHM3/H FAQ
1.How can I place an order for SMA5J40CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J40CAHM3/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 SMA5J40CAHM3/H reliable?
The price and inventory of SMA5J40CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J40CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMA5J40CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J40CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J40CAHM3/H?
SMA5J40CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J40CAHM3/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 SMA5J40CAHM3/H?
For technical support, including SMA5J40CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J40CAHM3/H requirements.
6.How does Aetrix verify that SMA5J40CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMA5J40CAHM3/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 SMA5J40CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMA5J40CAHM3/H?
All SMA5J40CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J40CAHM3/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 SMA5J40CAHM3/H part is unused and in its original packaging.
Return procedure for SMA5J40CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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