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Vishay General Semiconductor - Diodes Division SMAJ40CAHE3_A/H
- Part No.:
- SMAJ40CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40CAHE3_A/H.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:19,690
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Product details
Overview
SMAJ40CAHE3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 40 V standoff voltage (VWM), 44.4–49.1 V breakdown voltage (VBR) at 1 mA, 64.5 V maximum clamping voltage (VC) at 6.2 A peak pulse current, and 400 W peak pulse power rating (10/1000 μs waveform). It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power supply interfaces.
For engineers reviewing the SMAJ40CAHE3_A/H datasheet, SMAJ40CAHE3_A/H pinout, SMAJ40CAHE3_A/H application, or SMAJ40CAHE3_A/H equivalent, key selection criteria include bidirectional clamping behavior, 64.5 V clamping at 6.2 A, AEC-Q101 qualification status, RoHS-compliant matte tin terminations, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ leakage at 40 V), but triggers into low-impedance conduction when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable avalanche characteristics and fast response time (<1 ns).
The device is rated for repetitive 10/1000 μs surge pulses at 0.01% duty cycle (400 W up to 78 V; derated to 300 W above), with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), enabling reliable operation in ambient temperatures from –55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe working range for protected circuit. |
| VBR min/max | 44.4 V / 49.1 V at 1 mA - Confirmed breakdown window ensuring predictable turn-on during transients. |
| VC @ IPPM | 64.5 V at 6.2 A - Clamping voltage limits downstream component stress during 400 W surge events. |
| PPPM | 400 W (10/1000 μs) - Peak surge power handling capacity; derates to 300 W above 78 V per spec. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms), relevant for unidirectional variants; not applicable to bidirectional SMAJ40CAHE3_A/H. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with 0.208" length, 0.157" width, and 0.090" height; optimized for pick-and-place. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; polarity unmarked for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (during positive polarity surge) | One terminal of symmetrical avalanche junction; conducts when voltage across terminals exceeds |VBR| in either direction. |
| Cathode | Transient current entry (during negative polarity surge) | Second terminal of symmetrical junction; identical electrical role to Anode due to bidirectional construction. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM performance in both polarities - eliminates need for polarity-aware layout in AC-coupled or floating signal paths. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD - enables use in engine control units and ADAS sensor interfaces. |
| Glass passivated junction | Stable avalanche characteristics over lifetime and temperature - ensures consistent clamping voltage without parameter drift. |
| Low incremental surge resistance | Enables tighter VC–IPPM relationship - reduces voltage overshoot during fast-rising transients like ISO 7637-2 pulse 1/2a. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles - supports high-yield manufacturing without moisture sensitivity concerns. |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator ripple transients per ISO 7637-2. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between power rail and ground, triggered within <1 ns to clamp surges to ≤64.5 V. Use Value: Prevents latch-up or gate oxide damage in microcontrollers and CAN transceivers by limiting voltage excursion below absolute maximum ratings. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) from ESD and inductive switching noise in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp across differential or single-ended sensor outputs, absorbing ±8 kV contact ESD per IEC 61000-4-2. Use Value: Maintains signal integrity without adding capacitance-induced phase shift - typical junction capacitance <100 pF at 0 V. |
| Consumer Device USB Port Protection | Telecom DC Power Input Stage |
Use Scenario: Secondary-level surge suppression on VBUS line of USB 2.0 ports in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after primary fuse and upstream of USB switch IC, clamping fast transients induced by hot-plug events. Use Value: Complies with USB-IF ESD immunity requirements while avoiding false triggering during normal 5 V operation due to precise 40 V VWM. |
Use Scenario: Front-end protection of -48 V telecom rectifier outputs against lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Bidirectional clamp across DC input rails, conducting surge current to chassis ground via low-inductance path. Use Value: Withstands 400 W peak pulses without degradation, supporting multi-year field deployment in central office equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40CA-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade (non-AEC-Q101). | Lacks automotive qualification; suitable for consumer/industrial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and no temperature cycling or HTRB validation is needed. |
| SMBJ40CAHE3_A/H | Same VWM/VBR/VC specs but in larger SMB (DO-214AA) package; 600 W PPPM rating. | Higher surge margin and lower thermal resistance (RθJA = 80 °C/W); requires larger PCB footprint. | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 and 400 W is insufficient. |
Compared with SMAJ40CAHE3_A/H, SMAJ40CA-E3/61 offers identical protection performance without AEC-Q101 validation, while SMBJ40CAHE3_A/H delivers higher surge robustness in a physically larger package - enabling trade-offs between qualification assurance, board space, and pulse energy handling.
Availability
SMAJ40CAHE3_A/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom power input protection requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ40CAHE3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where voltage transients threaten functional safety and long-term operation.
FAQ
What is the clamping voltage of SMAJ40CAHE3_A/H at its rated peak pulse current?
The SMAJ40CAHE3_A/H has a maximum clamping voltage (VC) of 64.5 V at 6.2 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream ICs remain within safe operating voltage limits during surge events. The clamping performance is symmetric for both polarities due to its bidirectional construction.
Is SMAJ40CAHE3_A/H suitable for automotive applications?
Yes, SMAJ40CAHE3_A/H is AEC-Q101 qualified, meaning it has passed rigorous stress tests including temperature cycling, highly accelerated life testing (HALT), and ESD validation required for automotive electronic modules. Its operating junction temperature range of –55 °C to +150 °C and robust surge handling make it appropriate for engine control units, body electronics, and ADAS sensor interfaces.
How does the bidirectional configuration of SMAJ40CAHE3_A/H affect its circuit implementation?
The bidirectional configuration of SMAJ40CAHE3_A/H means it functions identically for positive and negative voltage transients - no cathode marking is present, and both terminals are electrically symmetric. This allows placement across any two nodes subject to differential surges (e.g., data lines, AC inputs, or floating sensors) without orientation constraints, simplifying layout and eliminating risk of incorrect installation.
What is the standoff voltage rating of SMAJ40CAHE3_A/H, and why is it important?
The standoff voltage (VWM) of SMAJ40CAHE3_A/H is 40 V - the maximum continuous reverse voltage it can block while maintaining leakage current below 1 μA. This rating ensures the device remains non-conductive during normal operation, preventing power loss or interference, while still triggering reliably when transients exceed the breakdown threshold. It directly determines compatibility with 36–42 V nominal systems like 48 V automotive architectures.
Does SMAJ40CAHE3_A/H require a heatsink for standard operation?
No, SMAJ40CAHE3_A/H is designed for surface-mount operation without external heatsinking under typical conditions. Its thermal resistance (RθJA) is specified at 120 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. For repetitive surge duty cycles or elevated ambient temperatures, PCB copper area and layout should follow Vishay's recommended pad dimensions to maintain junction temperature below +150 °C.
SMAJ40CAHE3_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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ40CAHE3_A/H FAQ
1.How can I place an order for SMAJ40CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40CAHE3_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 SMAJ40CAHE3_A/H reliable?
The price and inventory of SMAJ40CAHE3_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 SMAJ40CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ40CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40CAHE3_A/H?
SMAJ40CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40CAHE3_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 SMAJ40CAHE3_A/H?
For technical support, including SMAJ40CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40CAHE3_A/H requirements.
6.How does Aetrix verify that SMAJ40CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ40CAHE3_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 SMAJ40CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ40CAHE3_A/H?
All SMAJ40CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40CAHE3_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 SMAJ40CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ40CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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