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Vishay General Semiconductor - Diodes Division SMCJ24CAHM3_A/H
- Part No.:
- SMCJ24CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ24CAHM3_A/H.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,160
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Product details
Overview
SMCJ24CAHM3_A/H 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 maximum clamping voltage (VC) at 38.6 A peak pulse current (IPPM), and 1500 W peak pulse power (10/1000 µs waveform), commonly deployed on automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SMCJ24CAHM3_A/H datasheet, SMCJ24CAHM3_A/H pinout, SMCJ24CAHM3_A/H application, or SMCJ24CAHM3_A/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This device operates as a voltage-clamped crowbar during transients - its silicon avalanche junction responds in <1 ps to divert surge energy away from downstream circuitry. The bidirectional configuration ensures symmetrical clamping in both polarities without polarity marking, enabling use on AC-coupled or floating signal paths.
It is rated for 1500 W peak pulse power under standardized 10/1000 µs waveform, with clamping performance validated at TA = 25 °C on 8.0 mm × 8.0 mm copper pads. Its 0.096 %/°C temperature coefficient of breakdown voltage ensures stable VBR across the -55 °C to +150 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse working voltage before leakage exceeds 1 µA; defines upper limit of normal operating range. |
| VBR min/max | 26.7 V / 29.5 V - Breakdown occurs within this band at 1 mA test current; ensures reliable triggering above VWM. |
| VC @ IPPM | 38.9 V - Maximum clamped voltage seen by protected circuit during 38.6 A surge; determines worst-case stress on downstream ICs. |
| IPPM | 38.6 A - Peak surge current it can safely shunt with VC ≤ 38.9 V; directly tied to 1500 W rating under 10/1000 µs waveform. |
| PPPM | 1500 W - Surge power handling capacity; enables protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3/4 transients. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and high-ambient industrial settings. |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient; informs derating requirements when mounted on standard PCB copper areas. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow). Bidirectional construction means no polarity marking; both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (negative polarity) | Accepts reverse surge current during negative transients; forms one side of symmetrical clamping path. |
| Cathode | Transient current entry point (positive polarity) | Accepts reverse surge current during positive transients; forms other side of symmetrical clamping path. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment interfaces per stress test requirements. |
| Halogen-free (HM3) | Complies with IEC 61249-2-21 and JEDEC J-STD-020; eliminates brominated flame retardants for safer end-of-life processing. |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR = ~12.2 V) and faster energy dissipation versus higher-RSURGE TVS devices. |
| Very fast response time | Sub-nanosecond avalanche turn-on ensures protection before ESD or lightning-induced transients damage downstream CMOS inputs. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without baking; simplifies SMT line integration and inventory management. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching spikes in vehicle ECUs. IC Role / Device Role / Timing Role: Voltage-clamping protector placed directly at connector interface or IC input pins to limit transient voltage to safe levels. Use Value: Prevents latch-up or gate oxide rupture in 3.3 V/5 V sensor signal conditioning ICs during ISO 7637-2 Pulse 5a (load dump up to 60 V). | Use Scenario: Shielding digital input modules in programmable logic controllers from field-wiring induced surges due to relay coil de-energization or motor contactor switching. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input channels, placed upstream of optocoupler or Schmitt-trigger input stages. Use Value: Maintains functional safety integrity by limiting transient overshoot to <40 V, ensuring reliable operation of SIL2-rated control systems. |
| Telecom Line Interface Protection | Consumer Appliance Motor Control |
Use Scenario: Safeguarding Ethernet PHY magnetics and PoE controller inputs against EFT/burst noise and lightning-induced common-mode surges on outdoor telecom equipment. IC Role / Device Role / Timing Role: Bidirectional clamping element on differential pairs or supply rails, used alongside common-mode chokes and GDTs in multi-stage protection schemes. Use Value: Enables compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) Level 4 without sacrificing signal integrity on 100BASE-TX lines. | Use Scenario: Suppressing commutation spikes generated by brushed DC motors in washing machines, HVAC blowers, and power tools. IC Role / Device Role / Timing Role: Snubber-style clamp across motor terminals or H-bridge MOSFET drains to absorb inductive kickback energy. Use Value: Extends MOSFET lifetime by reducing VDS overshoot beyond 100 V, eliminating need for larger, costlier FETs with higher RDS(on). |
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/H | Lower 400 W PPPM, same VWM/VC, SMA package (smaller footprint, higher RθJA = 110 °C/W) | Not suitable for ISO 7637-2 Pulse 5a or IEC 61000-4-5 Level 4; limited to low-energy ESD/EFT scenarios. | Select when board space is constrained and surge threat level is ≤ Level 2; verify thermal margin with layout. |
| SMCJ24AHE3_A/H | Unidirectional version; includes cathode band marking; identical VWM, VBR, VC, and PPPM | Requires polarity-aware placement; unsuitable for AC or floating signals where bidirectional clamping is mandatory. | Choose only for DC-biased rails with known polarity; avoids ambiguity in grounding schemes where asymmetry is acceptable. |
Compared with SMAJ24CAHE3_A/H and SMCJ24AHE3_A/H, the SMCJ24CAHM3_A/H delivers full 1500 W surge capability in a halogen-free, AEC-Q101-qualified package - making it the only option among the three validated for automotive-grade 12 V/24 V system protection with zero halogen content and guaranteed reliability under extended temperature cycling.
Availability
SMCJ24CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection circuits, and consumer appliance motor control requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ24CAHM3_A/H 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, efficiency, and automotive qualification.
The SMCJ series is engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure modes must be mitigated without compromising signal fidelity or thermal performance.
FAQ
What does the "HM3" suffix indicate in SMCJ24CAHM3_A/H?
The "HM3" suffix in SMCJ24CAHM3_A/H denotes halogen-free, RoHS-compliant construction meeting JEDEC J-STD-020 MSL Level 1 and Vishay's material categorization standard. It confirms the molding compound contains no brominated or chlorinated flame retardants, supporting environmental compliance and safer recycling. This designation applies specifically to the SMCJ24CAHM3_A/H variant and is verified in Vishay document 88394.
Is SMCJ24CAHM3_A/H suitable for protecting CAN FD bus lines?
Yes, SMCJ24CAHM3_A/H is suitable for CAN FD bus protection when used in conjunction with appropriate common-mode filtering. Its 24 V VWM aligns with typical 12 V automotive supply rails, and its 38.9 V VC ensures the bus remains within ISO 11898-2 fault tolerance limits during transients. The bidirectional nature matches CAN's differential signaling, and AEC-Q101 qualification validates its robustness for automotive networks - confirmed in Vishay's SMCJ family application guidance.
How does the clamping voltage of SMCJ24CAHM3_A/H compare to its unidirectional counterpart SMCJ24AHM3_A/H?
The clamping voltage of SMCJ24CAHM3_A/H is identical to that of SMCJ24AHM3_A/H - both exhibit VC = 38.9 V at IPPM = 38.6 A per Vishay document 88394. The "CA" and "A" variants share identical electrical characteristics except for polarity configuration: SMCJ24CAHM3_A/H provides symmetrical clamping in both directions, while SMCJ24AHM3_A/H clamps only in reverse bias and requires correct cathode orientation.
Can SMCJ24CAHM3_A/H be used in parallel to increase surge current handling?
No, SMCJ24CAHM3_A/H should not be paralleled to increase surge current capacity. Due to manufacturing tolerances in VBR (26.7–29.5 V), uneven current sharing will occur - one device may conduct >80 % of the surge, leading to thermal runaway and failure. For higher current needs, select a single higher-rated device such as SMCJ28CAHM3_A/H or implement staged protection with upstream GDTs - as advised in Vishay's application note AN8001.
What is the maximum allowable PCB pad size for optimal thermal performance of SMCJ24CAHM3_A/H?
For optimal thermal performance, Vishay specifies a minimum mounting pad layout of 0.31" × 0.31" (8.0 mm × 8.0 mm) copper area per terminal for SMCJ24CAHM3_A/H, as stated in document 88394. Larger pads improve heat dissipation but do not reduce RθJA below the specified 75 °C/W typical value - further reduction requires internal thermal vias or external heatsinking. Pad dimensions must maintain clearance to adjacent traces per IPC-2221B Class B.
SMCJ24CAHM3_A/H 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:
- 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_A/H FAQ
1.How can I place an order for SMCJ24CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ24CAHM3_A/H 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_A/H reliable?
The price and inventory of SMCJ24CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ24CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ24CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ24CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ24CAHM3_A/H?
SMCJ24CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ24CAHM3_A/H 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_A/H?
For technical support, including SMCJ24CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ24CAHM3_A/H requirements.
6.How does Aetrix verify that SMCJ24CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ24CAHM3_A/H 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_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ24CAHM3_A/H?
All SMCJ24CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ24CAHM3_A/H, 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_A/H part is unused and in its original packaging.
Return procedure for SMCJ24CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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