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Vishay General Semiconductor - Diodes Division SMAJ40CAHM3_A/H
- Part No.:
- SMAJ40CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40CAHM3_A/H.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ40CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 40 V stand-off voltage (VWM), 64.5 V maximum clamping voltage at 6.2 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O protection, and DC power rail surge suppression.
For engineers reviewing the SMAJ40CAHM3_A/H datasheet, SMAJ40CAHM3_A/H pinout, SMAJ40CAHM3_A/H application, or SMAJ40CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT assembly under J-STD-002 solderability standards.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at 40 V), while the 150 °C maximum junction temperature supports operation in under-hood automotive environments.
The device delivers 400 W peak pulse power up to 78 V, derating to 300 W above that threshold per Fig. 2; it sustains repetitive surges at 0.01 % duty cycle and responds in <1.0 ns to transients. Mounting on 5.0 mm × 5.0 mm copper pads is required to achieve rated PPPM performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 48 V nominal systems. |
| VBR min / max | 44.4 V / 49.1 V at 1.0 mA - Verified breakdown range ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | 64.5 V at 6.2 A - Clamping voltage during 10/1000 μs surge; limits downstream IC stress to safe levels in 48 V supply rails. |
| PPPM | 400 W - Peak pulse power handling with standard 10/1000 μs waveform; sufficient for ISO 7637-2 Pulse 1 & 2a in automotive applications. |
| ID @ VWM | ≤1.0 μA - Ultra-low reverse leakage preserves battery life and signal integrity in always-on sensor circuits. |
| TJ max | +150 °C - Enables use in engine control units, motor drivers, and other high-temperature automotive zones. |
| Package | SMA (DO-214AC) - Industry-standard surface-mount outline with 2.54 mm lead pitch; compatible with JEDEC MS-013AC footprint. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 (260 °C reflow peak), UL 94 V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal 1 | One side of symmetrical PN junction; no polarity marking on bidirectional devices - either terminal may connect to line or ground. |
| Cathode | Terminal 2 | Other side of symmetrical PN junction; identical electrical behavior to Anode; bidirectional conduction eliminates orientation constraints during placement. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for ASIL-B system nodes. |
| Halogen-free & RoHS-compliant | HM3 suffix denotes halogen-free molding compound and full RoHS compliance - meets EU Directive 2011/65/EU and JESD201 Class 2 whisker resistance. |
| 400 W peak pulse power | Rated with 10/1000 μs waveform on 5.0 mm × 5.0 mm copper pads - provides robust protection against load dump and inductive switching events. |
| Fast response time | <1.0 ns turn-on - clamps transients before sensitive logic or analog circuitry sustains damage. |
| Low incremental surge resistance | Ensures minimal voltage overshoot during high di/dt events - critical for protecting MOSFET gates and microcontroller I/O pins. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN FD transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from ESD and load-dump-induced transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector interface or IC pad to shunt surge energy to ground. Use Value: Maintains signal integrity under ISO 10605 (30 kV air discharge) and suppresses >100 V transients to ≤64.5 V, preventing latch-up in 3.3 V/5 V receivers. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input channels, mounted adjacent to terminal block entry point. Use Value: Withstands repeated 400 W pulses without degradation, enabling >100,000 surge cycles in factory automation environments. |
| DC Power Rail Protection | Consumer Device USB Port Protection |
|
Use Scenario: Secondary surge protection on 48 V PoE++ or telecom power distribution boards upstream of DC-DC converters. IC Role / Device Role / Timing Role: Fast-acting crowbar device limiting transient overvoltage before primary regulator ICs. Use Value: Clamps 100 V/10 A transients to 64.5 V within nanoseconds, preserving converter MOSFETs and feedback resistors. |
Use Scenario: ESD and surge suppression on USB 2.0 data lines (D+/D−) and VBUS in smart home hubs and portable monitors. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed between connector and USB PHY, minimizing signal distortion. Use Value: 1.0 μA leakage at 40 V prevents standby current drain; 64.5 V clamping protects 5 V tolerant PHYs from IEC 61000-4-5 level 3 surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40CAHE3_A/H | Same electrical specs and AEC-Q101 qualification, but RoHS-compliant with standard brominated flame retardant (not halogen-free). | Acceptable where halogen-free requirement is not mandated by OEM or regional regulation (e.g., non-EU commercial designs). | Select HE3 version when cost sensitivity outweighs halogen-free compliance needs; HM3 required for automotive Tier 1 supply chains. |
| SMBJ40CAHM3_A/H | Same VWM and clamping, but SMB (DO-214AA) package - 30 % larger footprint, 500 W PPPM rating, higher thermal mass. | Better suited for high-energy surge environments (e.g., outdoor telecom cabinets) where PCB space permits larger package. | Choose SMBJ40CAHM3_A/H only if design requires >400 W pulse handling or improved thermal dissipation; SMAJ40CAHM3_A/H preferred for space-constrained automotive modules. |
Compared with SMAJ40CAHE3_A/H, the SMAJ40CAHM3_A/H offers halogen-free compliance essential for modern automotive programs; versus SMBJ40CAHM3_A/H, it trades 100 W pulse power for 30 % smaller board area - optimizing for compact, AEC-Q101–compliant 48 V system protection.
Availability
SMAJ40CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and 48 V DC power rail protection requiring stable component supply across multi-year production cycles.
Supply support for SMAJ40CAHM3_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 and automotive-grade qualification.
The SMAJ series was engineered specifically for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 compliance and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of the SMAJ40CAHM3_A/H under a 10/1000 μs surge?
The SMAJ40CAHM3_A/H has a maximum clamping voltage (VC) of 64.5 V at 6.2 A peak pulse current with a 10/1000 μs waveform. This value is measured per Figure 1 in Vishay Document 88390 and reflects worst-case performance under standardized surge conditions - critical for verifying voltage margins in 48 V system designs using the SMAJ40CAHM3_A/H.
Is the SMAJ40CAHM3_A/H suitable for automotive applications?
Yes, the SMAJ40CAHM3_A/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction validated for automotive use. It meets requirements for temperature cycling, high-temperature reverse bias, and mechanical shock - making it appropriate for engine control, body electronics, and ADAS sensor modules where the SMAJ40CAHM3_A/H is specified.
How does the bidirectional configuration of SMAJ40CAHM3_A/H affect PCB layout?
The SMAJ40CAHM3_A/H has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. Unlike unidirectional TVS diodes, the SMAJ40CAHM3_A/H allows flexible routing on differential or floating lines - simplifying layout for CAN, RS-485, or AC-coupled analog paths without risk of reverse installation.
What is the thermal resistance of SMAJ40CAHM3_A/H, and how does it impact power dissipation?
The SMAJ40CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 5.0 mm × 5.0 mm copper pads. This value determines steady-state power handling: at 25 °C ambient, the 3.3 W rated power dissipation corresponds to ~400 °C junction rise - confirming the device is intended for transient-only operation, not continuous DC loading, as defined in the SMAJ40CAHM3_A/H datasheet.
Does SMAJ40CAHM3_A/H meet industry standards for surge immunity testing?
Yes, the SMAJ40CAHM3_A/H is designed to meet IEC 61000-4-5 (surge immunity) and ISO 7637-2 (automotive transients) requirements. Its 400 W peak pulse power rating with 10/1000 μs waveform aligns with Level 3 and Level 4 test profiles - enabling direct implementation in designs requiring certified surge protection using the SMAJ40CAHM3_A/H as the primary clamping element.
SMAJ40CAHM3_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):
- 6.2A
- 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)
SMAJ40CAHM3_A/H FAQ
1.How can I place an order for SMAJ40CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40CAHM3_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 SMAJ40CAHM3_A/H reliable?
The price and inventory of SMAJ40CAHM3_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 SMAJ40CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ40CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40CAHM3_A/H?
SMAJ40CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40CAHM3_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 SMAJ40CAHM3_A/H?
For technical support, including SMAJ40CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ40CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ40CAHM3_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 SMAJ40CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ40CAHM3_A/H?
All SMAJ40CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40CAHM3_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 SMAJ40CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ40CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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