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Vishay General Semiconductor - Diodes Division SMCJ40CA-M3/57T
- Part No.:
- SMCJ40CA-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40CA-M3/57T.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,735
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Product details
Overview
SMCJ40CA-M3/57T from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on power and signal lines. It features 40 V standoff 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 sensor interfaces and industrial I/O protection.
For engineers reviewing the SMCJ40CA-M3/57T datasheet, SMCJ40CA-M3/57T pinout, SMCJ40CA-M3/57T application, or SMCJ40CA-M3/57T equivalent, key selection criteria include bidirectional clamping capability, halogen-free RoHS compliance (M3 suffix), 150 °C max junction temperature, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling suppression of positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance, critical for consistent clamping under repetitive surge events.
The device meets J-STD-020 MSL Level 1 moisture sensitivity and supports peak forward surge current up to 200 A (8.3 ms half-sine, unidirectional test condition), though its bidirectional configuration eliminates cathode/anode marking and relies on symmetrical VBR min/max (44.4 V / 49.1 V at 1 mA).
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 at 1 mA - Verified breakdown threshold range; ensures reliable turn-on within ±5.5% tolerance under standardized test current. |
| VC @ IPPM | 64.5 V at 23.3 A - Clamped voltage during 10/1000 μs transient; limits downstream voltage stress to ≤64.5 V under full-rated surge. |
| PPPM | 1500 W - Peak pulse power handling per 10/1000 μs waveform; enables robust protection against ISO 7637-2 Pulse 1/2/5a and IEC 61000-4-5 surges. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and high-ambient industrial enclosures. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm body and 2.62 mm lead spacing; compatible with IPC-7351B footprint. |
| Compliance | Halogen-free, RoHS-compliant (M3 suffix); meets JESD201 Class 2 whisker resistance and UL 94 V-0 flammability rating. |
Pinout & Package
SMCJ40CA-M3/57T uses the SMC (DO-214AB) package: a 2-terminal, non-polarized surface-mount case with no cathode band marking (bidirectional type). Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (symmetrical) | Either terminal serves as anode or cathode depending on transient polarity; no functional distinction in bidirectional operation. |
| Terminal 2 | Anode / Cathode (symmetrical) | Electrically identical to Terminal 1; forms a balanced, polarity-agnostic clamping path across protected line pair. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating differential lines (e.g., CAN bus, RS-485) without polarity concerns. |
| 1500 W peak pulse power | Withstands high-energy transients such as load dump (ISO 16750-2) and ESD-induced surges without degradation when mounted on recommended 8 mm × 8 mm pads. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage exposure to downstream ICs - e.g., protects 3.3 V or 5 V logic inputs even during 40 V line surges. |
| MSL Level 1 rating | Allows unlimited floor life and reflow without baking; simplifies manufacturing flow for high-volume SMT assembly. |
| Halogen-free & RoHS-compliant (M3) | Fulfills environmental compliance requirements for automotive Tier-1 suppliers and EU industrial equipment without sacrificing surge performance. |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
|
Use Scenario: Protecting LIN/CAN transceiver supply rails and data lines against battery load dump and alternator ripple in engine control modules. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt transients before reaching PHY layer. Use Value: Limits clamped voltage to 64.5 V while sustaining 1500 W surges - preventing latch-up or gate oxide damage in 5 V tolerant transceivers. |
Use Scenario: Safeguarding 4–20 mA current loop inputs in programmable logic controllers exposed to field wiring inductive kickback. IC Role / Device Role / Timing Role: Parallel-connected TVS across input terminals to clamp fast-rising transients (<1 ns rise time) induced by relay switching or motor drive noise. Use Value: Achieves sub-100 ns response with <15 Ω dynamic impedance, ensuring analog front-end op-amps remain within absolute maximum ratings. |
| Telecom Power Feeding | Consumer USB Port Protection |
|
Use Scenario: Securing PoE (Power over Ethernet) midspan injectors against lightning-induced surges on 48 V DC feed lines. IC Role / Device Role / Timing Role: Primary-stage TVS on DC output rail, coordinated with upstream GDT and downstream π-filter for multi-stage surge coordination. Use Value: Withstands repeated 1500 W pulses without parameter shift - validated per IEC 61000-4-5 Level 4 (4 kV/2 Ω) test conditions. |
Use Scenario: Hardening USB 2.0 data lines (D+/D−) and VBUS against ESD events during hot-plug insertion in portable docking stations. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp (CJ ≈ 100 pF at 0 V) placed adjacent to USB connector to minimize signal integrity impact. Use Value: Maintains USB 2.0 eye diagram integrity while suppressing ±15 kV contact ESD per IEC 61000-4-2 with <100 ps response. |
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-E3/57T | Lower PPPM (400 W), smaller SMA (DO-214AC) package, same VWM/VC specs but reduced surge margin. | Suitable for space-constrained consumer electronics where 400 W surge immunity suffices; not rated for automotive load dump. | Select when board area is critical and surge energy is limited to IEC 61000-4-5 Level 2 (1 kV). |
| SMCJ40A-M3/57T | Unidirectional variant; includes cathode band marking and forward voltage drop (VF = 3.5 V @ 100 A); same package and clamping specs. | Required only where asymmetric protection is needed - e.g., DC power rails with defined polarity and no negative transients. | Choose only if circuit topology mandates unidirectional clamping; otherwise SMCJ40CA-M3/57T offers broader design flexibility. |
Compared with SMAJ40CA-E3/57T and SMCJ40A-M3/57T, the SMCJ40CA-M3/57T delivers 3.75× higher surge power handling than the SMAJ series while maintaining bidirectional symmetry - making it the preferred choice for automotive and industrial applications demanding full 1500 W immunity without polarity constraints.
Availability
SMCJ40CA-M3/57T is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom power feeding requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ40CA-M3/57T 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, MOSFETs, and protection devices with emphasis on reliability and AEC-Q101 qualification.
The SMCJ series targets high-energy transient suppression in harsh environments - engineered specifically for automotive, industrial, and telecom infrastructure where 1500 W surge immunity and MSL Level 1 manufacturability are mandatory.
FAQ
What is the clamping voltage of SMCJ40CA-M3/57T at its rated peak pulse current?
The SMCJ40CA-M3/57T has a maximum clamping voltage (VC) of 64.5 V at its rated peak pulse current (IPPM) of 23.3 A, measured using the standard 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range and confirms the device's ability to limit transient overvoltage to a safe level for downstream 40 V-rated components. The SMCJ40CA-M3/57T maintains this clamping performance without degradation when mounted per the recommended 8.0 mm × 8.0 mm copper pad layout.
Is SMCJ40CA-M3/57T suitable for automotive applications?
Yes, the SMCJ40CA-M3/57T is qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes; however, the M3/57T variant is commercial-grade and widely used in automotive subsystems such as body control modules and sensor interfaces where full qualification is not mandated. Its 150 °C junction rating, 1500 W surge capability, and halogen-free construction meet core automotive robustness requirements. For full AEC-Q101 compliance, specify SMCJ40CAHM3_X (e.g., SMCJ40CAHM3_A/H) - the SMCJ40CA-M3/57T itself remains a proven solution in non-safety-critical vehicle systems.
How does the bidirectional design of SMCJ40CA-M3/57T affect PCB layout?
The bidirectional design of SMCJ40CA-M3/57T eliminates polarity constraints - no cathode band marking is present, and either terminal functions identically regardless of voltage polarity. This simplifies PCB layout by removing orientation checks during placement and enabling use on AC-coupled or floating lines like RS-485 or CAN without concern for directionality. Layout must still follow the recommended 8.0 mm × 8.0 mm copper pad per terminal to ensure thermal dissipation and surge current handling; the SMCJ40CA-M3/57T performs identically in both directions under transient stress.
What is the thermal resistance of SMCJ40CA-M3/57T, and how does it impact power derating?
The SMCJ40CA-M3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W. At ambient temperatures above 25 °C, its 6.5 W steady-state power dissipation (PD) must be linearly derated - for example, at 75 °C ambient, PD drops to ~3.25 W. This derating is critical for sustained leakage current management in high-temperature enclosures; however, the SMCJ40CA-M3/57T's transient suppression capability remains unaffected since PPPM is defined for short-duration pulses, not continuous operation.
Can SMCJ40CA-M3/57T replace unidirectional TVS diodes in existing designs?
Yes, the SMCJ40CA-M3/57T can replace unidirectional variants like SMCJ40A-M3/57T in most applications - especially where bidirectional transients exist or polarity is undefined - without PCB changes. Its identical package, pinout, and clamping characteristics (same VC and VBR) allow drop-in substitution; however, note that the SMCJ40CA-M3/57T lacks a cathode band and exhibits symmetrical leakage at both polarities. Verify that system-level transient profiles are truly bidirectional before replacement, as unidirectional devices may offer lower leakage in DC-biased rails - the SMCJ40CA-M3/57T remains fully compatible where symmetry is required or beneficial.
SMCJ40CA-M3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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):
- 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 (SMC)
SMCJ40CA-M3/57T FAQ
1.How can I place an order for SMCJ40CA-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40CA-M3/57T 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-M3/57T reliable?
The price and inventory of SMCJ40CA-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40CA-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ40CA-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40CA-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40CA-M3/57T?
SMCJ40CA-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40CA-M3/57T 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-M3/57T?
For technical support, including SMCJ40CA-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40CA-M3/57T requirements.
6.How does Aetrix verify that SMCJ40CA-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ40CA-M3/57T 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-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ40CA-M3/57T?
All SMCJ40CA-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40CA-M3/57T, 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-M3/57T part is unused and in its original packaging.
Return procedure for SMCJ40CA-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40CA-M3/57T Tags
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