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Vishay General Semiconductor - Diodes Division SMCJ40CA/57T
- Part No.:
- SMCJ40CA/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40CA/57T.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,299
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Product details
Overview
SMCJ40CA/57T from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of sensitive electronics. It features a 40 V stand-off voltage (VWM), 64.5 V maximum clamping voltage (VC) at 23.3 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive power line and industrial sensor interface protection.
For engineers reviewing the SMCJ40CA/57T datasheet, SMCJ40CA/57T pinout, SMCJ40CA/57T application, or SMCJ40CA/57T equivalent, key selection criteria include bi-directional clamping symmetry, AEC-Q101 qualification, low incremental surge resistance, and compatibility with automated SMT assembly on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ40CA/57T operates as a bi-directional avalanche diode, exhibiting symmetrical breakdown behavior in both polarities with identical VBR min/max (44.4–49.1 V) and VC (64.5 V) under standardized 10/1000 µs surge conditions. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1 ns), critical for protecting MOSFET gates and microcontroller I/O against ESD and inductive switching transients.
Thermally, it sustains operation from –55 °C to +150 °C junction temperature, with RθJA = 75 °C/W and RθJL = 15 °C/W, enabling reliable performance without heatsinking in moderate-power applications. The device is qualified to AEC-Q101 and meets UL 497B recognition (QVGQ2), supporting use in automotive-grade power distribution and CAN/LIN bus protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe 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 across production lot. |
| VC @ IPPM | 64.5 V at 23.3 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on protected IC. |
| PPPM | 1500 W - Peak surge power handling capability; enables suppression of high-energy transients like ISO 7637-2 Pulse 1/2a/5a. |
| ID @ VWM | ≤1.0 µA - Reverse leakage at rated stand-off voltage; negligible loading on low-power sensor or communication lines. |
| TJ max. | +150 °C - Maximum junction temperature; supports under-hood automotive placement and industrial ambient conditions. |
| Package | DO-214AB (SMCJ) - Surface-mount, low-profile case with matte tin-plated leads; compatible with J-STD-002 soldering and JESD 22-B102 reliability standards. |
Pinout & Package
SMCJ40CA/57T uses the DO-214AB (SMCJ) package: a bi-directional device with no polarity marking; both terminals are electrically symmetric and interchangeable. The case is molded compound meeting UL 94 V-0, with 0.320" (8.13 mm) body length and 0.220"–0.246" (5.59–6.22 mm) width.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional surge conduction path | Either terminal serves as anode or cathode depending on transient polarity; no band marking required. |
| Case (cathode side for uni-directional variants) | Non-connected mechanical reference | Not electrically tied to silicon die; thermal path only - no grounding or biasing function. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive powertrain and chassis applications per stress test requirements including HTOL, TC, and UHAST. |
| UL 497B recognition (QVGQ2) | Approved for use as primary protector in telecom and industrial signal/power interfaces per Underwriters Laboratories standards. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns or baking requirements. |
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage over lifetime, even under thermal cycling and humidity exposure. |
| Low incremental surge resistance | Minimizes clamping overshoot during fast-rising transients (e.g., EFT bursts), improving protection margin for 3.3 V/5 V logic. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC/DC converters and microcontrollers. Use Value: Limits transient voltage to ≤64.5 V while absorbing 1500 W surges, preventing latch-up or gate oxide damage in downstream semiconductors. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and inductive kickback in factory automation PLCs. IC Role / Device Role / Timing Role: Bi-directional shunt clamp on differential or single-ended signal lines interfacing with ADC front-ends. Use Value: Maintains signal integrity with <1.0 µA leakage at 40 V, while responding in <1 ns to ±8 kV contact ESD per IEC 61000-4-2. |
| Telecom Data Line Surge Suppression | Consumer Device USB/Power Port Protection |
Use Scenario: Safeguarding RS-485 transceivers and Ethernet PHYs against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Secondary-level TVS placed after gas discharge tube (GDT) or polymer PTC in hybrid protection networks. Use Value: Provides precise clamping at 64.5 V with minimal capacitance, preserving signal rise time and data integrity up to 10 Mbps. |
Use Scenario: Hardening USB Type-A/B ports and 5 V power rails in smart home hubs against user-handling ESD and hot-plug transients. IC Role / Device Role / Timing Role: Standalone bi-directional clamp on VBUS and D+/D− lines, compliant with USB 2.0 eye diagram requirements. Use Value: Delivers 1500 W surge rating in compact DO-214AB footprint, enabling full-system protection without board area penalty. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ40CA | Same DO-214AC (SMA) package; lower PPPM (400 W); higher VC (69.4 V at 14.3 A); not AEC-Q101 qualified. | Limited to commercial-grade consumer or office equipment; unsuitable for automotive under-hood deployment. | Select when cost sensitivity outweighs surge energy requirement and automotive qualification is unnecessary. |
| ON Semiconductor 1.5KE40CA | Through-hole DO-201AE package; same VWM/VC specs; higher thermal mass but incompatible with SMT assembly. | Used in legacy industrial controls where manual assembly or high-reliability through-hole mounting is mandated. | Choose only if board design mandates axial/lead-based packaging and reflow compatibility is not required. |
Compared with SMCJ40CA/57T, SMAJ40CA offers smaller footprint but reduced surge capacity and no automotive qualification, while 1.5KE40CA provides identical electrical specs in a non-SMT form factor - making SMCJ40CA/57T the optimal choice for AEC-Q101-compliant, high-energy, surface-mount TVS applications.
Availability
SMCJ40CA/57T is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor nodes, and telecom infrastructure requiring stable component supply with traceable RoHS-compliant sourcing and AEC-Q101 validation.
Supply support for SMCJ40CA/57T 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, and protection devices with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The SMCJ series targets high-energy transient suppression in harsh environments - engineered for AEC-Q101 compliance, UL recognition, and robust surge handling in automotive, industrial, and telecom power/signal lines.
FAQ
What is the clamping voltage of SMCJ40CA/57T and how is it measured?
The SMCJ40CA/57T has a maximum clamping voltage (VC) of 64.5 V, measured at a peak pulse current (IPPM) of 23.3 A using the standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed across the full operating temperature range and reflects the upper limit of voltage seen by protected circuitry during worst-case transient events. The SMCJ40CA/57T maintains this clamping performance due to its low incremental surge resistance and symmetrical bi-directional structure.
Is SMCJ40CA/57T suitable for automotive applications?
Yes, SMCJ40CA/57T is AEC-Q101 qualified and UL 497B recognized (QVGQ2), making it suitable for automotive power line and signal line protection including engine control modules, body electronics, and ADAS sensor interfaces. Its –55 °C to +150 °C operating range, MSL Level 1 rating, and validated reliability under temperature cycling and humidity testing confirm its readiness for under-hood and chassis-mounted deployments. The SMCJ40CA/57T meets ISO 7637-2 Pulse 1, 2a, and 5a immunity requirements when applied with appropriate PCB layout.
How does the bi-directional nature of SMCJ40CA/57T affect its usage compared to uni-directional variants?
The bi-directional SMCJ40CA/57T provides symmetrical clamping for both positive and negative transients without polarity constraints - eliminating the need for orientation-aware placement and enabling use on AC-coupled or floating signal lines. Unlike uni-directional SMCJ40A, which requires correct cathode alignment and conducts only in reverse bias, the SMCJ40CA/57T functions identically regardless of terminal connection order. This simplifies design for differential buses (e.g., RS-485) and ungrounded sensor outputs where voltage polarity reversal is possible.
What is the recommended PCB pad layout for SMCJ40CA/57T to achieve rated PPPM?
To achieve the full 1500 W peak pulse power rating, SMCJ40CA/57T must be mounted on minimum recommended copper pads: 0.31" × 0.31" (8.0 mm × 8.0 mm) per terminal, per Vishay Document 88394. Smaller pads reduce thermal dissipation and derate PPPM significantly - e.g., at TA = 75 °C, derating follows Fig. 2 in the datasheet. The SMCJ40CA/57T's RθJA = 75 °C/W assumes this layout; inadequate copper area increases junction temperature and risks thermal runaway during repeated surges.
Does SMCJ40CA/57T have RoHS and halogen-free compliance?
Yes, SMCJ40CA/57T carries the "E3" suffix indicating RoHS-compliant construction per Directive 2011/65/EU and halogen-free status per JEDEC JS709A. The molding compound meets UL 94 V-0 flammability rating, and matte tin-plated leads comply with J-STD-002 solderability and JESD 22-B102 durability standards. These certifications are documented in Vishay's material categorization notice (doc?99912) and apply to the SMCJ40CA/57T as shipped in 7" tape-and-reel (57T) packaging.
SMCJ40CA/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ40CA/57T FAQ
1.How can I place an order for SMCJ40CA/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40CA/57T 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 SMCJ40CA/57T reliable?
The price and inventory of SMCJ40CA/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40CA/57T is usually 5 days.
3.What payment methods are accepted for SMCJ40CA/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40CA/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40CA/57T?
SMCJ40CA/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40CA/57T 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 SMCJ40CA/57T?
For technical support, including SMCJ40CA/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40CA/57T requirements.
6.How does Aetrix verify that SMCJ40CA/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ40CA/57T 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 SMCJ40CA/57T meets industry standards.
7.What is the process for return or replacement of SMCJ40CA/57T?
All SMCJ40CA/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40CA/57T, 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 SMCJ40CA/57T part is unused and in its original packaging.
Return procedure for SMCJ40CA/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40CA/57T Tags
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