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Vishay General Semiconductor - Diodes Division SMA5J40CAHM3_A/H
- Part No.:
- SMA5J40CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J40CAHM3_A/H.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,471
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Product details
Overview
SMA5J40CAHM3_A/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 power and signal lines. It features a 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 - used to safeguard automotive sensor interfaces and industrial I/O circuits against ESD and load-switching transients.
For engineers reviewing the SMA5J40CAHM3_A/H datasheet, SMA5J40CAHM3_A/H pinout, SMA5J40CAHM3_A/H application, or SMA5J40CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification (via HM3 suffix), halogen-free RoHS compliance, and thermal resistance (RθJA = 80 °C/W) under PCB pad-limited conduction conditions.
Technical Context
This device operates as a voltage-clamped shunt protector, responding within picoseconds to transient overvoltages exceeding its VWM threshold. Its bidirectional symmetry ensures identical clamping behavior in both polarities, with no polarity marking required on the SMA package.
Designed for surface-mount automated assembly, it uses glass-passivated junction technology and meets J-STD-020 MSL Level 1 (260 °C peak reflow). The 500 W PPPM rating is validated on 5.0 mm × 5.0 mm copper pads per terminal, and derating applies above TA = 25 °C per Fig. 2 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 44.4 V / 49.1 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold tolerance |
| VC @ IPPM | 64.5 V at 7.8 A - Clamped voltage during 10/1000 μs surge, limiting stress on downstream ICs |
| PPPM | 500 W - Peak pulse power handling capacity under standardized surge waveform |
| TJ max. | +150 °C - Maximum junction temperature, enabling operation in under-hood automotive environments |
| RθJA | 80 °C/W - Thermal resistance from junction to ambient on standard 5 mm × 5 mm pads, critical for power derating |
| ID @ VWM | 1.0 μA - Reverse leakage at stand-off voltage, ensuring minimal standby power loss |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional, unmarked case (no cathode band).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge path | No polarity distinction - either terminal serves as input/output for transient energy diversion |
| Case (cathode band absent) | Thermal and mechanical interface | Exposed metal slug provides primary heat conduction path to PCB copper; no electrical isolation |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection on AC-coupled or floating lines without polarity concerns |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Halogen-free & RoHS-compliant | Meets automotive and industrial environmental compliance requirements without compromising surge robustness |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a) |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking, reducing manufacturing overhead |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load-dump and jump-start transients in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed at connector entry point, clamping surges before they reach signal conditioning circuitry. Use Value: Withstands 500 W pulses and maintains <64.5 V clamping at 7.8 A, preventing damage to 3.3 V/5 V microcontrollers and ADC front-ends. | Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to inductive switching noise from solenoids and contactors. IC Role / Device Role / Timing Role: Bidirectional TVS deployed across isolated 24 V DC input terminals to absorb repetitive 10/1000 μs surges up to 500 W. Use Value: Halogen-free HM3 construction supports long-term industrial deployment while meeting IEC 61000-4-5 Level 4 immunity requirements. |
| Telecom Power Rail Protection | Consumer Appliance Motor Control |
Use Scenario: Guarding 48 V PoE-powered Ethernet switch ports against lightning-induced surges and hot-swap transients. IC Role / Device Role / Timing Role: Primary clamping device on DC input rail, coordinated with upstream fuses and secondary filtering. Use Value: 40 V VWM aligns with 48 V nominal systems, and 64.5 V VC ensures safe margin below typical 75 V MOSFET drain ratings. | Use Scenario: Protecting microcontroller GPIOs and gate drivers in washing machine motor inverters from back-EMF spikes during brushless DC motor commutation. IC Role / Device Role / Timing Role: Localized TVS on low-voltage control signals adjacent to high-side/low-side driver ICs. Use Value: Fast response time and low Rsurge limit voltage overshoot to <65 V, preserving 60 V-rated logic-level MOSFETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J40CAHE3_A/H | RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification | Suitable for commercial/industrial use only; not approved for automotive production | Select when halogen-free content or automotive qualification is not required |
| SMA6J40CAHM3_A/H | 600 W PPPM rating, higher IPPM (8.7 A), same VWM/VBR/VC specs | Provides 20 % higher surge margin for designs facing extreme transients (e.g., heavy-duty machinery) | Choose when system-level surge testing exceeds 500 W requirements |
Compared with SMA5J40CAHM3_A/H, SMA5J40CAHE3_A/H omits halogen-free and AEC-Q101 compliance, while SMA6J40CAHM3_A/H delivers higher surge headroom without changing footprint or clamping behavior - enabling drop-in robustness upgrades where layout reuse is critical.
Availability
SMA5J40CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom power supply protection requiring stable component supply and long-term lifecycle support.
Supply support for SMA5J40CAHM3_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 and application-specific performance.
The SMA5J series is engineered for high-power-density transient suppression in space-constrained, high-reliability applications - particularly targeting automotive, industrial, and telecom systems where surge immunity must coexist with environmental compliance and automated assembly.
FAQ
What does the "HM3" suffix indicate for SMA5J40CAHM3_A/H?
The HM3 suffix on SMA5J40CAHM3_A/H denotes halogen-free, RoHS-compliant construction and AEC-Q101 qualification. This makes SMA5J40CAHM3_A/H suitable for automotive production environments where material compliance and reliability validation are mandatory. Unlike E3 or M3 variants, HM3 ensures full traceability to automotive-grade test reports and process controls.
Is SMA5J40CAHM3_A/H unidirectional or bidirectional?
SMA5J40CAHM3_A/H is a bidirectional transient voltage suppressor, as confirmed by the "CA" suffix in its part number. It provides symmetrical clamping in both polarities, with no cathode marking on the SMA package. This eliminates polarity orientation errors during placement and enables use on AC-coupled or floating signal paths where voltage reversals occur.
What is the clamping voltage of SMA5J40CAHM3_A/H and how is it measured?
The clamping voltage (VC) of SMA5J40CAHM3_A/H is 64.5 V, measured at a peak pulse current (IPPM) of 7.8 A using a 10/1000 μs double-exponential surge waveform. This value reflects the maximum voltage seen across the device during standardized surge testing and defines the upper voltage limit imposed on protected circuitry during transient events.
Can SMA5J40CAHM3_A/H be used in place of SMA5J40A?
No - SMA5J40CAHM3_A/H is bidirectional, while SMA5J40A is unidirectional. Their VBR, VWM, and VC values differ due to polarity architecture: SMA5J40A has VF = 3.5 V at 25 A (forward conduction), whereas SMA5J40CAHM3_A/H exhibits identical reverse characteristics in both directions and no forward voltage specification. Substitution requires circuit-level verification of polarity requirements.
What PCB pad layout is required to achieve the rated 500 W PPPM for SMA5J40CAHM3_A/H?
To achieve the full 500 W peak pulse power rating, SMA5J40CAHM3_A/H must be mounted on minimum recommended copper pads: 0.2" x 0.2" (5.0 mm x 5.0 mm) per terminal, per datasheet note (2). Smaller pads reduce thermal dissipation and require derating per Fig. 2; insufficient copper area may cause premature thermal failure during repeated surges.
SMA5J40CAHM3_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):
- 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_A/H FAQ
1.How can I place an order for SMA5J40CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J40CAHM3_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 SMA5J40CAHM3_A/H reliable?
The price and inventory of SMA5J40CAHM3_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 SMA5J40CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMA5J40CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J40CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J40CAHM3_A/H?
SMA5J40CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J40CAHM3_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 SMA5J40CAHM3_A/H?
For technical support, including SMA5J40CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J40CAHM3_A/H requirements.
6.How does Aetrix verify that SMA5J40CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMA5J40CAHM3_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 SMA5J40CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMA5J40CAHM3_A/H?
All SMA5J40CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J40CAHM3_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 SMA5J40CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMA5J40CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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