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Vishay General Semiconductor - Diodes Division SMCJ24A-M3/9AT
- Part No.:
- SMCJ24A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ24A-M3/9AT.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,455
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Product details
Overview
SMCJ24A-M3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 24 V standoff voltage (VWM), 26.7–29.5 V breakdown range (VBR at 1 mA), 38.6 A peak pulse current (IPPM), 38.9 V clamping voltage (VC), and 1500 W peak pulse power (10/1000 µs waveform), commonly deployed in automotive power supply input stages.
For engineers reviewing the SMCJ24A-M3/9AT datasheet, SMCJ24A-M3/9AT pinout, SMCJ24A-M3/9AT application, or SMCJ24A-M3/9AT equivalent, key selection criteria include unidirectional polarity, 1500 W surge capability, 24 V operating voltage compatibility, thermal resistance (RθJA = 75 °C/W), and halogen-free RoHS-compliant M3 suffix packaging for industrial and automotive-grade reliability.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below VWM = 24 V and rapidly transitions to low-impedance conduction above VBR ≥ 26.7 V to limit transient energy. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (< 1 ns), while the SMC package supports automated placement and meets MSL level 1 per J-STD-020.
The device is rated for -55 °C to +150 °C junction temperature, with 6.5 W steady-state power dissipation at TA = 50 °C and 200 A non-repetitive forward surge current (8.3 ms half-sine). Its low incremental surge resistance enables effective suppression of inductive switching transients and ESD events on 24 V systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 26.7 V / 29.5 V at IT = 1 mA - Confirmed breakdown threshold defining turn-on precision |
| VC @ IPPM | 38.9 V at 38.6 A - Clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 1500 W - Peak transient power handling capacity under standardized surge waveform |
| IPPM | 38.6 A - Maximum non-repetitive surge current the device safely conducts |
| TJ max. | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient, guiding heatsinking requirements |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Polarity indicated by cathode band; unidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes clamping loop during transient |
| Cathode | High-side connection point | Connected to protected line (e.g., 24 V rail); band-marked terminal |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power rating | Enables reliable suppression of high-energy transients such as load dump in 24 V automotive systems |
| 38.9 V clamping voltage at 38.6 A | Keeps protected ICs and MOSFETs within safe operating area during ISO 7637-2 Pulse 5a events |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for industrial and automotive production without compromising reliability |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly processes without moisture sensitivity concerns |
| AEC-Q101 qualification option available | Enables drop-in use in automotive applications when ordered with HM3 suffix (e.g., SMCJ24AHM3_X) |
Applications
| Automotive Power Input Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24 V battery-fed ECUs against load dump and jump-start surges per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between power rail and chassis ground. Use Value: Limits transient voltage to ≤38.9 V, preventing damage to upstream DC-DC converters and microcontrollers. | Use Scenario: Shielding digital input modules from field-wiring induced transients in factory automation cabinets. IC Role / Device Role / Timing Role: Rail-to-ground transient clamp on 24 V sensor supply lines. Use Value: Absorbs >1500 W surges without degradation, ensuring long-term reliability in harsh EMI environments. |
| Telecom Power Supply Protection | Motor Drive Control Board Protection |
Use Scenario: Safeguarding PoE-powered equipment front-end regulators from lightning-induced surges on 24–48 V DC feeds. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side DC bus. Use Value: Fast <1 ns response and low clamping ratio (VC/VWM = 1.62) preserve regulator integrity during fast-rising transients. | Use Scenario: Protecting gate drivers and current sense amplifiers from inductive kickback in BLDC motor controllers. IC Role / Device Role / Timing Role: Localized clamp across H-bridge power supply rails. Use Value: Withstands 200 A single-half-sine surge (IFSM) and maintains stable VBR over temperature (-55 °C to +150 °C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A-E3/61T | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W) | Suitable only for lower-energy transients; not recommended for automotive load dump | Select when space-constrained and surge energy is limited to <400 W |
| SMCJ24AHM3_A/I | Identical electrical specs; AEC-Q101 qualified, halogen-free, 13" tape-and-reel (I suffix) | Required for automotive OEM production; same PCB layout, enhanced reliability validation | Choose for automotive-grade deployment where qualification and traceability are mandatory |
Compared with SMAJ24A-E3/61T and SMCJ24AHM3_A/I, the SMCJ24A-M3/9AT delivers full 1500 W surge capability in a commercial-grade, halogen-free SMC package with 3500-unit 13" reel packaging-ideal for industrial volume production requiring robustness without AEC-Q101 overhead.
Availability
SMCJ24A-M3/9AT is available at Aetrix Electronics and suitable for automotive power input protection, industrial PLC I/O protection, telecom power supply protection, and motor drive control board protection requiring stable component supply and consistent halogen-free compliance.
Supply support for SMCJ24A-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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power transient suppression in automotive, industrial, and telecom infrastructure where robust 1500 W clamping and stable parametric performance across temperature are critical.
FAQ
What is the clamping voltage of SMCJ24A-M3/9AT under maximum surge conditions?
The SMCJ24A-M3/9AT has a maximum clamping voltage (VC) of 38.9 V at its rated peak pulse current of 38.6 A (10/1000 µs waveform). This value is measured per ANSI/IEEE C62.35 standards and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. The SMCJ24A-M3/9AT maintains this clamping performance across its full operating temperature range.
Is SMCJ24A-M3/9AT suitable for automotive applications?
The SMCJ24A-M3/9AT is a commercial-grade, halogen-free, RoHS-compliant TVS diode-not AEC-Q101 qualified by default. For automotive use, Vishay offers the functionally identical SMCJ24AHM3_X variant (e.g., SMCJ24AHM3_A/I), which carries full AEC-Q101 qualification. The SMCJ24A-M3/9AT may be used in non-safety-critical automotive subsystems where qualification is not mandated, but design validation remains the customer's responsibility.
What does the "M3" suffix mean in SMCJ24A-M3/9AT?
The "M3" suffix in SMCJ24A-M3/9AT indicates halogen-free, RoHS-compliant construction meeting JEDEC JESD201 Class 2 whisker resistance requirements. It denotes commercial-grade reliability with environmentally compliant materials-distinct from "E3" (RoHS-compliant but not halogen-free) and "HM3" (AEC-Q101 qualified + halogen-free). The SMCJ24A-M3/9AT uses matte tin-plated leads and UL 94 V-0 molding compound.
How does SMCJ24A-M3/9AT compare to bidirectional variants like SMCJ24CA?
The SMCJ24A-M3/9AT is unidirectional, with polarity marked by a cathode band and intended for DC rail protection where reverse conduction must be blocked. In contrast, SMCJ24CA is bidirectional, symmetrical, and used in AC or floating signal-line applications. Their VWM, VBR, and VC values differ: SMCJ24CA has VWM = 24 V but bidirectional breakdown, whereas SMCJ24A-M3/9AT conducts only in reverse bias. Electrical specs are not interchangeable without circuit redesign.
What is the thermal resistance and derating behavior of SMCJ24A-M3/9AT?
The SMCJ24A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" copper pads. Its peak pulse power derates linearly above TA = 25 °C per Figure 2 in the datasheet, reaching ~75 % of 1500 W at 75 °C ambient. Continuous power dissipation is limited to 6.5 W at TA = 50 °C. The SMCJ24A-M3/9AT must be thermally anchored per Vishay's recommended pad layout to maintain reliability.
SMCJ24A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMCJ24A-M3/9AT FAQ
1.How can I place an order for SMCJ24A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ24A-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 SMCJ24A-M3/9AT reliable?
The price and inventory of SMCJ24A-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 SMCJ24A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ24A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ24A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ24A-M3/9AT?
SMCJ24A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ24A-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 SMCJ24A-M3/9AT?
For technical support, including SMCJ24A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ24A-M3/9AT requirements.
6.How does Aetrix verify that SMCJ24A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ24A-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 SMCJ24A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ24A-M3/9AT?
All SMCJ24A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ24A-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 SMCJ24A-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ24A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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