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Vishay General Semiconductor - Diodes Division SMCJ24CAHM3/I
- Part No.:
- SMCJ24CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ24CAHM3/I.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,345
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Product details
Overview
SMCJ24CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 24 V standoff voltage (VWM), 38.9 V clamping voltage (VC) at 38.6 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMCJ24CAHM3/I datasheet, SMCJ24CAHM3/I pinout, SMCJ24CAHM3/I application, or SMCJ24CAHM3/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, halogen-free RoHS compliance, and thermal resistance (RθJA = 75 °C/W) for high-reliability board-level surge suppression.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within picoseconds to transients induced by inductive switching or ESD events. Its glass-passivated junction ensures stable breakdown behavior, while bidirectional symmetry enables protection on AC-coupled or floating signal paths without polarity constraints.
The device is rated for -55 °C to +150 °C operating junction temperature, meets MSL level 1 per J-STD-020 (260 °C peak reflow), and delivers low incremental surge resistance for minimal voltage overshoot during high-current surges up to 38.6 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR min/max | 26.7 V / 29.5 V at 1 mA - Confirmed breakdown voltage range ensuring reliable turn-on under surge conditions. |
| VC @ IPPM | 38.9 V at 38.6 A - Clamped voltage during 1500 W transient; determines maximum stress imposed on protected ICs. |
| PPPM | 1500 W - Peak pulse power handling capability with 10/1000 μs waveform; validates suitability for IEC 61000-4-5 Level 4 surges. |
| IPPM | 38.6 A - Peak pulse current supported at VC; critical for sizing PCB trace width and thermal relief pads. |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8 mm × 8 mm copper pads; guides heatsinking requirements. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102. No polarity marking - bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink (reverse bias) | One terminal of symmetrical PN junction; conducts during positive or negative overvoltage events. |
| Cathode | Transient current sink (reverse bias) | Second terminal of symmetrical PN junction; identical electrical role to Anode in bidirectional mode. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection on AC, differential, or floating nodes without polarity concerns - no external orientation required. |
| AEC-Q101 qualification | Validated for automotive applications including engine control, ADAS sensors, and infotainment power domains. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving margin for 3.3 V/5 V logic interfaces. |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without moisture-induced failure - eliminates bake-out requirement. |
| Halogen-free construction | Complies with IPC-4101D/21 and EU Directive 2011/65/EU Annex II amendments for green manufacturing. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs in body control modules against load dump and jump-start transients. IC Role / Device Role / Timing Role: Shunt clamping device that diverts >100 V surges away from LDO regulators and MCU VDD pins. Use Value: Maintains system uptime by limiting rail voltage to ≤38.9 V during ISO 7637-2 Pulse 5a events, preventing brownout resets. | Use Scenario: Safeguarding RS-485 transceiver I/O pins in factory automation PLCs exposed to motor drive noise and ground bounce. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential pair to suppress ±30 kV ESD (IEC 61000-4-2) and 1 kV ring wave (IEC 61000-4-12). Use Value: Preserves signal integrity by clamping transients before they distort data eye diagrams or damage transceiver ESD structures. |
| Consumer USB Port Surge Suppression | Telecom Base Station DC Feed Protection |
Use Scenario: Integrated into USB-C PD port designs to protect controller ICs and Type-C CC logic from hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF typical) bidirectional TVS placed between VBUS and GND, upstream of buck converter. Use Value: Prevents latch-up in USB PD controllers by clamping 8 kV contact ESD to <40 V within <1 ns - no data corruption or firmware lockup. | Use Scenario: Installed on 48 V DC feed lines powering remote radio units (RRUs) in 5G base stations subject to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-stage TVS in multi-stage protection scheme, absorbing bulk energy before downstream MOVs and GDTs. Use Value: Withstands repeated 1500 W surges without degradation, extending field service life beyond 10 years in outdoor telecom cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24CAHE3/A | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a or IEC 61000-4-5 Level 4. | Select when board space is constrained and surge threat level is Class B (IEC 61000-4-5 Level 2). |
| SMCJ24AHE3/I | Unidirectional version; same VWM, VC, PPPM, but requires correct polarity placement and cannot protect AC signals. | Applicable only on DC rails with known polarity; not usable on differential buses or transformer-coupled lines. | Choose only when protecting single-polarity DC supplies where reverse conduction must be blocked. |
Compared with SMAJ24CAHE3/A and SMCJ24AHE3/I, the SMCJ24CAHM3/I provides higher surge robustness in the same footprint, full bidirectional symmetry for flexible layout, and halogen-free construction aligned with Tier 1 automotive sourcing mandates.
Availability
SMCJ24CAHM3/I is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom power feed protection requiring stable component supply across long production lifecycles.
Supply support for SMCJ24CAHM3/I 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, automotive qualification, and green manufacturing.
The SMCJ series targets high-energy transient suppression in harsh environments, with design focus on AEC-Q101 compliance, low clamping ratio, and compatibility with automated SMT assembly for automotive and industrial end equipment.
FAQ
What is the clamping voltage of the SMCJ24CAHM3/I under a 10/1000 μs surge?
The SMCJ24CAHM3/I clamps to 38.9 V at its rated peak pulse current of 38.6 A with a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024, Document Number 88394. The clamping voltage directly defines the maximum stress applied to downstream components during surge events, making it critical for validating protection margins in 24 V systems.
Is the SMCJ24CAHM3/I suitable for automotive applications?
Yes, the SMCJ24CAHM3/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant, and automotive-grade construction. It is explicitly rated for operating junction temperatures from -55 °C to +150 °C and meets MSL Level 1 reflow requirements - all validated per Vishay's qualification test reports. These attributes make SMCJ24CAHM3/I appropriate for under-hood and chassis-mounted automotive modules.
How does the bidirectional configuration of SMCJ24CAHM3/I affect PCB layout?
The SMCJ24CAHM3/I has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. Unlike unidirectional variants such as SMCJ24AHE3/I, the SMCJ24CAHM3/I can be used across AC-coupled lines, differential pairs, or floating grounds without risk of reverse-bias failure. This simplifies layout, reduces BOM variants, and improves yield in high-mix manufacturing.
What is the thermal resistance of SMCJ24CAHM3/I, and how does it impact thermal design?
The SMCJ24CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. This value assumes standard JEDEC test conditions and informs minimum pad area and copper thickness needed to maintain TJ ≤ 150 °C during repetitive surge events. For high-duty-cycle applications, thermal vias and internal planes should be added to reduce effective RθJA.
Does SMCJ24CAHM3/I meet UL recognition standards?
Yes, the SMCJ24CAHM3/I carries Underwriters Laboratories recognition under UL 497B (QVGQ2) and is listed in UL file E136766 for both unidirectional and bidirectional transient suppressors. This certification confirms compliance with safety requirements for surge protective devices used in telecommunications, industrial controls, and automotive electronics - supporting regulatory submissions in North America and globally harmonized markets.
SMCJ24CAHM3/I 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):
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ24CAHM3/I FAQ
1.How can I place an order for SMCJ24CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ24CAHM3/I 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 SMCJ24CAHM3/I reliable?
The price and inventory of SMCJ24CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ24CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ24CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ24CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ24CAHM3/I?
SMCJ24CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ24CAHM3/I 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 SMCJ24CAHM3/I?
For technical support, including SMCJ24CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ24CAHM3/I requirements.
6.How does Aetrix verify that SMCJ24CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ24CAHM3/I 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 SMCJ24CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ24CAHM3/I?
All SMCJ24CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ24CAHM3/I, 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 SMCJ24CAHM3/I part is unused and in its original packaging.
Return procedure for SMCJ24CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ24CAHM3/I Tags
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