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Vishay General Semiconductor - Diodes Division SMCJ40CAHE3/9AT
- Part No.:
- SMCJ40CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40CAHE3/9AT.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,614
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Product details
Overview
SMCJ40CAHE3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 1500 W peak pulse power rating, 40 V standoff voltage (VWM), and 64.5 V maximum clamping voltage (VC) at 23.3 A peak pulse current (IPPM). It protects sensitive ICs, MOSFETs, and sensor signal lines against inductive switching transients and lightning-induced surges in automotive and industrial systems.
For engineers reviewing the SMCJ40CAHE3/9AT datasheet, SMCJ40CAHE3/9AT pinout, SMCJ40CAHE3/9AT application, or SMCJ40CAHE3/9AT equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 1500 W surge rating, low incremental surge resistance, and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
The SMCJ40CAHE3/9AT operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (<1 μA leakage at 40 V), but triggers into low-impedance conduction when transient voltage exceeds its 44.4–49.1 V breakdown range (VBR at 1 mA). Its glass-passivated junction ensures stable avalanche behavior and fast response time (<1 ns).
Thermally, it features RθJA = 75 °C/W and RθJL = 15 °C/W, enabling reliable operation up to +150 °C junction temperature. The device meets MSL Level 1 per J-STD-020 and supports lead-free reflow with peak temperature of 260 °C, making it suitable for high-reliability automotive electronics requiring long-term stability under thermal cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR min/max | 44.4 V / 49.1 V - Breakdown voltage range at 1 mA test current; guarantees consistent turn-on threshold across production lots. |
| VC @ IPPM | 64.5 V - Clamping voltage at 23.3 A peak pulse current (10/1000 µs waveform); determines maximum voltage stress imposed on downstream components during surge. |
| PPPM | 1500 W - Peak pulse power handling capacity; enables robust protection against IEC 61000-4-5 Level 4 surges and automotive load-dump transients. |
| ID @ VWM | 1.0 µA - Reverse leakage current at 40 V; ensures minimal standby power loss and signal integrity in high-impedance interfaces. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and industrial enclosures without derating. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Bidirectional construction means no polarity marking; both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path (bidirectional) | Provides symmetrical conduction path during positive or negative voltage excursions beyond VBR; connects to ground or common reference plane. |
| Cathode | Transient current return path (bidirectional) | Electrically identical to Anode in bidirectional configuration; no functional distinction-both terminals serve as dual-polarity surge shunt nodes. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN bus, RS-485, sensor bridges) without polarity concerns. |
| AEC-Q101 qualification | Confirms suitability for automotive powertrain, body control, and ADAS modules where field failure risk must be minimized over 15+ year service life. |
| 1500 W peak pulse rating | Supports compliance with ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 Combination Wave (1.2/50 µs + 8/20 µs) immunity requirements. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage overshoot during surge events, reducing stress on protected ICs such as microcontrollers and analog front-ends. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile usage without baking, simplifying manufacturing logistics for high-volume SMT lines. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load-dump transients (up to 60 V, 400 ms) and alternator ripple spikes. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between power rail and chassis ground, clamping voltage within safe limits for downstream regulators and MCU inputs. Use Value: Prevents latch-up or permanent damage to automotive-grade microcontrollers by limiting transient voltage to ≤64.5 V during 1500 W surge events. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog input cards in factory automation. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential sensor output pair to absorb ESD and inductive kickback from nearby solenoid actuation. Use Value: Maintains signal fidelity by limiting transient-induced offset shift to <1% full-scale due to sub-1 ns response and low clamping voltage. |
| Telecom Line Interface | Consumer Device USB Port Protection |
|
Use Scenario: Shielding Ethernet PHY interface circuits (e.g., PoE injectors) from lightning-induced surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Common-mode TVS array component used in conjunction with GDTs and CM chokes to divert surge energy before reaching PHY silicon. Use Value: Enables compliance with ITU-T K.21 Basic Protection Level by clamping common-mode transients to <65 V at 23 A peak. |
Use Scenario: Adding secondary-level surge protection to USB 2.0 data lines (D+/D−) in smart home hubs exposed to user-handling ESD and cable coupling noise. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed directly at connector to suppress ±8 kV contact ESD per IEC 61000-4-2 without degrading signal rise time. Use Value: Achieves <0.5 pF typical junction capacitance (per leg), preserving USB 2.0 eye diagram integrity while passing 30 kV air discharge tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC40CA | Same VWM (40 V) and PPPM (1500 W), but smaller SMA package (DO-214AC); lower IPPM (21.5 A) and higher VC (67.5 V). | Limited to lower-energy surges; unsuitable for ISO 7637-2 Pulse 5a due to reduced surge margin. | Select SAC40CA only when board space is constrained and surge threat level is limited to IEC 61000-4-2/4-4. |
| SMCJ40CAHM3/9AT | Identical electrical specs and AEC-Q101 qualification, but halogen-free molding compound and HM3 suffix instead of HE3. | No functional difference; chosen solely for RoHS-compliant halogen-free material requirements in EU automotive supply chains. | Choose SMCJ40CAHM3/9AT when environmental compliance mandates halogen-free construction without altering circuit design. |
Compared with SAC40CA, the SMCJ40CAHE3/9AT delivers higher surge current handling and tighter clamping for demanding automotive applications; versus SMCJ40CAHM3/9AT, it shares identical performance but differs only in material composition-making HE3 optimal for cost-sensitive AEC-Q101 designs where halogen content is unrestricted.
Availability
SMCJ40CAHE3/9AT is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, telecom line protection, and consumer USB port hardening requiring stable component supply across multi-year production cycles.
Supply support for SMCJ40CAHE3/9AT 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 SMCJ series targets high-power transient suppression in harsh environments, engineered specifically for automotive, industrial, and telecom applications where robustness against repetitive surge stress and long-term parametric stability are critical.
FAQ
What does the "CA" suffix indicate in SMCJ40CAHE3/9AT?
The "CA" suffix denotes a bidirectional configuration, meaning the SMCJ40CAHE3/9AT provides symmetrical clamping for both positive and negative voltage transients. Unlike unidirectional variants (e.g., SMCJ40A), it has no cathode marking and functions identically in either polarity-ideal for protecting AC-coupled or floating signal paths such as CAN bus lines or differential sensor outputs.
Is SMCJ40CAHE3/9AT qualified for automotive use?
Yes, the SMCJ40CAHE3/9AT carries AEC-Q101 qualification, verified through rigorous stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD robustness validation. This makes it suitable for under-hood and cabin-mounted automotive modules where reliability over extended temperature ranges (−55 °C to +150 °C) and lifetime durability are mandatory.
How does SMCJ40CAHE3/9AT compare to unidirectional SMCJ40A in circuit implementation?
The SMCJ40CAHE3/9AT replaces two unidirectional devices in back-to-back configuration with a single component, simplifying layout and reducing bill-of-materials count. While SMCJ40A requires explicit polarity orientation and protects only one voltage polarity, the SMCJ40CAHE3/9AT eliminates orientation concerns and delivers matched clamping in both directions-critical for differential signaling and transformer-coupled interfaces.
What is the recommended PCB pad layout for SMCJ40CAHE3/9AT?
Vishay specifies mounting on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve rated 1500 W surge capability. Smaller pads reduce thermal dissipation and cause premature failure under repeated surges. The SMC (DO-214AB) outline drawing confirms 0.220–0.246" body width and 0.114–0.126" terminal length, requiring precise stencil aperture design for optimal solder joint formation and mechanical reliability.
Does SMCJ40CAHE3/9AT meet UL recognition standards?
Yes, the SMCJ40CAHE3/9AT is UL recognized under file E136766 for both unidirectional and bidirectional configurations, meeting UL 497B for primary protectors. This certification validates its safety performance in telecom and industrial installations where regulatory compliance for surge protection devices is required-particularly for equipment intended for connection to public networks or mains-powered systems.
SMCJ40CAHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- 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):
- 23.3A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMCJ)
SMCJ40CAHE3/9AT FAQ
1.How can I place an order for SMCJ40CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40CAHE3/9AT 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 SMCJ40CAHE3/9AT reliable?
The price and inventory of SMCJ40CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ40CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40CAHE3/9AT?
SMCJ40CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40CAHE3/9AT 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 SMCJ40CAHE3/9AT?
For technical support, including SMCJ40CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40CAHE3/9AT requirements.
6.How does Aetrix verify that SMCJ40CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ40CAHE3/9AT 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 SMCJ40CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ40CAHE3/9AT?
All SMCJ40CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40CAHE3/9AT, 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 SMCJ40CAHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ40CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40CAHE3/9AT Tags
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