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Vishay General Semiconductor - Diodes Division SMCJ24CA-M3/9AT
- Part No.:
- SMCJ24CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ24CA-M3/9AT.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMCJ24CA-M3/9AT 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 signal or power lines. It features 24 V standoff voltage (VWM), 38.9 V maximum clamping voltage (VC) at 38.6 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMCJ24CA-M3/9AT datasheet, SMCJ24CA-M3/9AT pinout, SMCJ24CA-M3/9AT application, or SMCJ24CA-M3/9AT equivalent, key selection criteria include bidirectional clamping capability, low incremental surge resistance, MSL Level 1 moisture sensitivity, halogen-free RoHS compliance (M3 suffix), and AEC-Q101 qualification readiness via HM3 variant.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown behavior and fast response time (<1 ns), while the SMC package provides robust thermal dissipation (RθJL = 15 °C/W) under high-energy surge conditions.
The device complies with ANSI/IEEE C62.35 for transient suppressor definitions and meets UL 497B recognition (QVGQ2) for telecom and industrial protector classification. It is rated for -55 °C to +150 °C operating junction temperature and supports automated SMT placement per J-STD-002 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 24 V - maximum continuous reverse working voltage before clamping initiates |
| VBR (Breakdown Voltage) | 26.7–29.5 V at 1 mA - guaranteed conduction onset range for transient suppression |
| VC (Clamping Voltage) | 38.9 V at 38.6 A IPPM - peak voltage seen by protected circuit during 10/1000 µs surge |
| PPPM (Peak Pulse Power) | 1500 W - energy-handling capacity for standardized lightning/surge immunity testing |
| ID (Reverse Leakage) | 1.0 µA max at 24 V - negligible standby current draw in normal operation |
| TJ max | +150 °C - enables use in under-hood automotive or high-ambient industrial environments |
| Package | SMC (DO-214AB) - industry-standard 2-pin surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal requirement |
Pinout & Package
SMCJ24CA-M3/9AT uses the standard SMC (DO-214AB) package: a 2-terminal, non-polarized surface-mount device with no cathode marking (bidirectional type). Terminals are matte tin-plated leads, compatible with J-STD-002 soldering and JESD 22-B102 reliability testing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; voltage clamping occurs across the pair regardless of polarity |
| Case (body) | Thermal and mechanical interface | Non-electrical; requires 8.0 mm × 8.0 mm copper pads per terminal for rated PPPM performance |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or ungrounded power rails without polarity constraints |
| 1500 W peak pulse rating | Meets IEC 61000-4-5 Level 4 (4 kV line-to-line, 2 kV line-to-ground) surge immunity requirements |
| Halogen-free & RoHS-compliant (M3) | Complies with IPC-1752A material declaration and EU Directive 2011/65/EU Annex II updates |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C peak without baking - simplifies SMT production flow |
| UL 497B recognized (QVGQ2) | Validated for use in telecom, industrial, and automotive signal-line protectors per Underwriters Laboratories |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at connector entry point to clamp transients before they reach signal conditioning circuitry. Use Value: Limits induced voltage to ≤38.9 V during 38.6 A surges, preventing latch-up or gate oxide damage in downstream ASICs and microcontrollers. | Use Scenario: Safeguarding 24 V DC digital input modules in programmable logic controllers against field-wiring induced surges and relay contact bounce. IC Role / Device Role / Timing Role: Standoff-rated TVS shunting transient energy away from optocoupler input stages and Schmitt-trigger comparators. Use Value: Maintains <1.0 µA leakage at 24 V, ensuring clean logic thresholds while surviving repeated 1500 W surges per IEC 61000-4-4. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Shielding RS-485 transceivers and Ethernet PHY magnetics from ESD and lightning-induced surges in base station backhaul equipment. IC Role / Device Role / Timing Role: Differential-mode TVS mounted across twisted-pair lines to suppress common-mode and asymmetrical transients simultaneously. Use Value: Symmetric 26.7–29.5 V breakdown ensures balanced clamping on both conductors, preserving signal integrity during fast-rising transients. | Use Scenario: Protecting H-bridge gate drivers and MCU GPIOs from inductive kickback when controlling BLDC motors in smart home appliances. IC Role / Device Role / Timing Role: Low-capacitance TVS placed at motor driver output pins to absorb flyback energy without distorting PWM timing. Use Value: 38.9 V clamping prevents overvoltage stress on 3.3 V or 5 V logic rails while supporting 1500 W surge handling per IEC 61000-4-5. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24CA-E3/61T | Lower PPPM (400 W), SMA package (smaller thermal mass), higher RθJA (110 °C/W) | Suitable only for lower-energy transients; not recommended for IEC 61000-4-5 Level 4 | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2 ESD or low-energy switching noise |
| SMCJ24A-M3/9AT | Unidirectional version; same VWM, VC, and PPPM but polarized - requires correct orientation during layout | Applicable where DC bias exists and polarity is known (e.g., 24 V supply rail protection) | Choose only if system architecture guarantees consistent polarity; otherwise SMCJ24CA-M3/9AT avoids orientation risk |
Compared with SMAJ24CA-E3/61T and SMCJ24A-M3/9AT, the SMCJ24CA-M3/9AT delivers full 1500 W bidirectional surge immunity in a thermally robust SMC package - making it the preferred choice for automotive, industrial, and telecom interfaces requiring polarity-agnostic protection without PCB redesign.
Availability
SMCJ24CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, telecom line interfaces, and consumer appliance motor controllers requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ24CA-M3/9AT 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, precision, and application-specific optimization.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial automation, and infrastructure equipment where failure tolerance and regulatory compliance are critical.
FAQ
What does the "CA" suffix mean in SMCJ24CA-M3/9AT?
The "CA" suffix in SMCJ24CA-M3/9AT denotes a bidirectional configuration - meaning the device clamps voltage transients equally in both directions across its terminals. This eliminates polarity concerns during PCB layout and makes it ideal for protecting AC-coupled signals, differential buses like RS-485, or floating power domains where voltage reversal may occur. Unlike unidirectional variants (e.g., SMCJ24A), the SMCJ24CA-M3/9AT has no cathode marking and functions identically regardless of terminal orientation.
Is SMCJ24CA-M3/9AT qualified to AEC-Q101?
The SMCJ24CA-M3/9AT itself is not AEC-Q101 qualified; however, Vishay offers the HM3-suffixed variant (e.g., SMCJ24CAHM3_A/I) which carries full AEC-Q101 qualification for automotive applications. The "M3" suffix indicates halogen-free, RoHS-compliant construction and MSL Level 1 rating, but AEC-Q101 requires additional stress testing including temperature cycling, HTRB, and ESD - only confirmed for HM3-grade ordering codes. Always verify qualification status using the full P/N with Vishay's official documentation.
What is the maximum clamping voltage of SMCJ24CA-M3/9AT and how is it measured?
The maximum clamping voltage (VC) of SMCJ24CA-M3/9AT is 38.9 V, measured at a peak pulse current (IPPM) of 38.6 A using the standardized 10/1000 µs double-exponential surge waveform defined in ANSI/IEEE C62.35. This value represents the highest voltage that will appear across the device during worst-case transient events - critical for ensuring downstream components (e.g., 3.3 V or 5 V logic ICs) remain within safe operating limits. The test condition assumes mounting on 8.0 mm × 8.0 mm copper pads per terminal, as specified in the datasheet.
Can SMCJ24CA-M3/9AT be used in place of a unidirectional TVS like SMCJ24A-M3/9AT?
Yes, SMCJ24CA-M3/9AT can replace SMCJ24A-M3/9AT in most applications, but with important design implications: the bidirectional version removes polarity dependency, simplifying layout and eliminating risk of reverse installation - yet introduces slightly higher leakage at low voltages due to symmetrical junction design. If the protected circuit has a fixed DC bias (e.g., 24 V supply rail), the unidirectional SMCJ24A-M3/9AT may offer marginally better leakage performance. However, for AC, differential, or floating nodes, SMCJ24CA-M3/9AT is the technically superior and safer choice.
What is the thermal resistance and how does it affect SMCJ24CA-M3/9AT performance?
The SMCJ24CA-M3/9AT has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W and junction-to-ambient (RθJA) of 75 °C/W when mounted on minimum recommended 8.0 mm × 8.0 mm copper pads. RθJL directly impacts surge survivability: lower values allow faster heat dissipation from the silicon junction during short-duration pulses, preserving clamping consistency across repeated surges. For continuous power dissipation (PD = 6.5 W), RθJA determines steady-state temperature rise - requiring adequate board copper area or heatsinking to maintain TJ ≤ 150 °C in high-ambient environments.
SMCJ24CA-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 38.6A
- 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)
SMCJ24CA-M3/9AT FAQ
1.How can I place an order for SMCJ24CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ24CA-M3/9AT 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 SMCJ24CA-M3/9AT reliable?
The price and inventory of SMCJ24CA-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ24CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ24CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ24CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ24CA-M3/9AT?
SMCJ24CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ24CA-M3/9AT 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 SMCJ24CA-M3/9AT?
For technical support, including SMCJ24CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ24CA-M3/9AT requirements.
6.How does Aetrix verify that SMCJ24CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ24CA-M3/9AT 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 SMCJ24CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ24CA-M3/9AT?
All SMCJ24CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ24CA-M3/9AT, 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 SMCJ24CA-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ24CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ24CA-M3/9AT Tags
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