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Taiwan Semiconductor Corporation SMCJ24CAH
- Part No.:
- SMCJ24CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ24CAH.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,226
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Product details
Overview
SMCJ24CAH from Taiwan Semiconductor is a bidirectional 24 V standoff, 1500 W surface-mount transient voltage suppressor (TVS) in DO-214AB (SMC) package, with 38.9 V clamping voltage at 40 A peak pulse current and <1 µA reverse leakage at 24 V, designed for automotive-grade ESD and load-dump protection in power supply rails and data lines.
For engineers reviewing the SMCJ24CAH datasheet, SMCJ24CAH pinout, SMCJ24CAH application, or SMCJ24CAH equivalent, key selection criteria include bidirectional clamping performance, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, fast sub-1 ps response time, and thermal robustness up to 150°C junction temperature.
Technical Context
The SMCJ24CAH implements a glass-passivated silicon avalanche diode structure optimized for high-energy transient suppression in both polarities. Its breakdown voltage range of 26.7–29.5 V at 1 mA test current ensures reliable triggering above system operating voltage while maintaining low clamping ratio (VC/VBR ≈ 1.35).
Thermal design is supported by RθJC = 10°C/W and RθJA = 55°C/W, enabling sustained operation under repetitive surge conditions when mounted on adequate copper area. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse working voltage; defines safe DC/AC operating margin before conduction begins |
| VBR min/max | 26.7 V / 29.5 V @ 1 mA - Confirmed avalanche onset range; ensures consistent turn-on across production lots |
| VC @ IPPM | 38.9 V @ 40 A - Clamping voltage during 10/1000 µs surge; limits downstream IC stress to safe levels |
| PPK | 1500 W - Peak pulse power rating per 1 ms waveform; supports high-energy transients like ISO 7637-2 Pulse 5a |
| IR @ VWM | <1 µA - Reverse leakage at rated standoff voltage; minimizes standby power loss and signal integrity impact |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments without derating |
| Response time | <1.0 ps - Time from 0 V to VBR min; ensures protection before sensitive circuitry sustains damage |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, bidirectional configuration with cathode band omitted (symmetrical terminals). Case meets UL 94V-0 flammability rating; matte tin-plated leads comply with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction | No polarity marking required; identical clamping behavior in either direction for AC or floating rail protection |
| Case (cathode band absent) | Thermal and mechanical interface | Exposed metal slug provides primary heat path to PCB; requires minimum 100 mm² copper pad for full thermal rating |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and ADAS power domains |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) without degradation |
| Glass passivated junction | Enhances long-term reliability and stability of VBR and leakage under thermal cycling and humidity stress |
| Fast response <1 ps | Prevents voltage overshoot beyond clamping level during nanosecond-scale ESD events (IEC 61000-4-2) |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained designs |
Applications
| Automotive Power Rail Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: 12 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converters and microcontrollers. Use Value: Limits rail voltage to ≤38.9 V during 1500 W surges, preventing latch-up or gate oxide rupture in downstream semiconductors. |
Use Scenario: Two-wire CAN FD transceivers operating in factory automation networks with frequent cable hot-plug and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional line protector on CAN_H and CAN_L differential pair. Use Value: Maintains signal integrity by clamping common-mode transients to <40 V while adding <0.5 pF junction capacitance at 0 V bias. |
| Telecom PoE Injector Port | Consumer USB-C Power Delivery |
Use Scenario: 48 V PoE++ (IEEE 802.3bt) injector outputs subject to lightning-induced surges on Ethernet pairs. IC Role / Device Role / Timing Role: Secondary-level TVS on each powered pair (spare pairs or data pairs with integrated power). Use Value: Absorbs 1500 W pulses without failure, preserving IEEE 802.3bt interoperability and avoiding false PSE disconnects. |
Use Scenario: USB-C receptacle on portable devices where VBUS line must survive accidental 24 V adapter misconnection or ESD discharge. IC Role / Device Role / Timing Role: Standoff-rated protector between VBUS and ground, sized for 24 V tolerance with headroom. Use Value: Blocks >24 V faults while leaking <1 µA at nominal 5–20 V PD voltages, eliminating standby current penalty. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA | Lower peak power rating (600 W), same VWM/VC, SMB package (smaller thermal mass) | Suitable only for lower-energy transients (e.g., IEC 61000-4-5 2 kV); not recommended for ISO 7637-2 Pulse 5a | Select SMCJ24CAH when 1500 W surge immunity and AEC-Q101 qualification are mandatory. |
| TPSMD24C | Same 1500 W rating and DO-214AB package, but VC = 39.4 V @ 40 A and no AEC-Q101 certification | Lacks automotive qualification; acceptable for industrial/commercial systems with less stringent reliability requirements | Choose SMCJ24CAH for automotive OEM programs requiring full AEC-Q101 traceability and ISO 7637-2 validation. |
Compared with SMBJ24CA and TPSMD24C, the SMCJ24CAH uniquely delivers AEC-Q101 qualification, verified ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and guaranteed 1500 W clamping performance in the DO-214AB footprint-making it the preferred choice for safety-critical automotive and heavy-industrial deployments.
Availability
SMCJ24CAH is available at Aetrix Electronics and suitable for automotive electronic control units, industrial CAN bus nodes, and telecom PoE injectors requiring stable component supply with full AEC-Q101 traceability and surge immunity assurance.
Supply support for SMCJ24CAH 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and automotive-qualified components since 1979.
The SMCJ series belongs to TSC's AEC-Q101-qualified transient suppression portfolio, engineered specifically for harsh-environment automotive and industrial power-line protection where reliability under repeated surge stress is non-negotiable.
FAQ
What does the 'CAH' suffix indicate in SMCJ24CAH?
The 'CAH' suffix in SMCJ24CAH denotes a bidirectional configuration (C), AEC-Q101 qualification (A), and halogen-free construction (H). Unlike unidirectional variants (e.g., SMCJ24H), the SMCJ24CAH provides symmetrical clamping in both polarities-critical for protecting AC-coupled or floating signal lines without polarity constraints.
Is SMCJ24CAH compatible with lead-free reflow soldering processes?
Yes, SMCJ24CAH is fully compatible with standard lead-free reflow profiles (JEDEC J-STD-020 Level 1), featuring matte tin-plated leads and a moisture sensitivity level (MSL) of 1. No baking or special handling is required prior to assembly, supporting high-throughput automated placement in modern SMT lines.
How does SMCJ24CAH perform under repetitive surge conditions?
SMCJ24CAH maintains stable clamping performance under repetitive 10/1000 µs surges when thermally managed per its RθJA = 55°C/W rating. Derating curves (Fig.2) show 50% power capability at 75°C ambient; proper PCB copper area (≥100 mm² per terminal) is essential to sustain multiple events without thermal runaway.
Can SMCJ24CAH replace SMCJ24A in existing designs?
SMCJ24CAH is not a direct replacement for SMCJ24A: the latter is unidirectional with cathode marking and VF = 3.5 V, while SMCJ24CAH is bidirectional with no polarity marking and symmetric IV characteristics. Swapping requires layout review to confirm absence of polarity-dependent circuitry and verify clamping symmetry suffices for the application.
What is the maximum clamping voltage of SMCJ24CAH at its rated peak current?
The maximum clamping voltage of SMCJ24CAH is 38.9 V at 40 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is guaranteed across temperature (−55°C to +150°C) and represents the upper limit of voltage seen by protected circuitry during worst-case surge events.
SMCJ24CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- 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):
- 40A
- 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)
SMCJ24CAH FAQ
1.How can I place an order for SMCJ24CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ24CAH 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 SMCJ24CAH reliable?
The price and inventory of SMCJ24CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ24CAH is usually 5 days.
3.What payment methods are accepted for SMCJ24CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ24CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ24CAH?
SMCJ24CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ24CAH 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 SMCJ24CAH?
For technical support, including SMCJ24CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ24CAH requirements.
6.How does Aetrix verify that SMCJ24CAH is sourced from the original manufacturer or authorized distributors?
All SMCJ24CAH 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 SMCJ24CAH meets industry standards.
7.What is the process for return or replacement of SMCJ24CAH?
All SMCJ24CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ24CAH, 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 SMCJ24CAH part is unused and in its original packaging.
Return procedure for SMCJ24CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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