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Taiwan Semiconductor Corporation SMCJ24CA
- Part No.:
- SMCJ24CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ24CA.pdf
- Description:
- TVS DIODE 24VWM 38.9VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:7,685
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Product details
Overview
SMCJ24CA from Taiwan Semiconductor is a bidirectional 1500W transient voltage suppressor diode in DO-214AB (SMC) package, with 24V working stand-off voltage (VWM), 26.7–29.5V breakdown voltage (VBR), and 38.9V maximum clamping voltage (VC) at 40A peak impulse current - designed for automotive load-dump and ISO 7637-2 Pulse 1/2a/2b/3a/3b protection in power supply rails and CAN/LIN interfaces.
For engineers reviewing the SMCJ24CA datasheet, SMCJ24CA pinout, SMCJ24CA application, or SMCJ24CA equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD tolerance, unidirectional/bidirectional configuration matching system polarity requirements, thermal derating above 25°C ambient, and compliance with automotive EFT immunity standards.
Technical Context
The SMCJ24CA is a glass-passivated, bipolar TVS diode optimized for fast transient suppression with sub-1ps response time from 0V to VBR min. Its bidirectional structure enables symmetrical clamping in AC-coupled or floating signal lines without polarity concerns.
It operates across –55°C to +150°C junction temperature range, features <1μA reverse leakage at 24V, and delivers 1500W peak pulse power per 1ms 10/1000μs waveform - validated under ISO 7637-2 test pulses for automotive electronics robustness.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for safe DC bias on protected line. |
| VBR min/max | 26.7 V / 29.5 V @ 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on before downstream IC overvoltage damage. |
| VC @ IPPM | 38.9 V @ 40 A - Clamped voltage during 10/1000μs surge; must stay below absolute max rating of protected device (e.g., 40V-rated transceiver). |
| PPK | 1500 W - Peak pulse power handling per single 1ms transient; defines survivability against high-energy spikes like load dump. |
| IR @ VWM | <1 μA - Reverse leakage at rated stand-off voltage; negligible power loss and signal distortion in standby operation. |
| TJ max | +150 °C - Maximum junction temperature; supports under-hood automotive placement with appropriate PCB copper area for thermal dissipation. |
Pinout & Package
DO-214AB (SMC) surface-mount package: molded epoxy case meeting UL 94V-0, matte tin-plated leads, polarity indicated by cathode band (bidirectional function means band denotes common terminal, not polarity direction).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode Band End | Common Terminal (Bidirectional) | Shared connection point for both avalanche paths; connects to protected line (e.g., CAN_H or 24V rail); no anode/cathode distinction in CA devices. |
| Opposite End | Common Terminal (Bidirectional) | Electrically identical to cathode-band end; completes symmetrical clamping path - requires no orientation during placement. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC-coupled buses (e.g., RS-485, CAN) without polarity-sensitive layout or external diode pairing. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (EFT) - meets OEM automotive EMC requirements out-of-box. |
| Sub-1ps response time | Activates before most microsecond-scale transients fully develop, preventing voltage overshoot beyond protected IC's absolute maximum ratings. |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; compatible with standard SMT assembly processes without special handling or dry-packaging. |
Applications
| Automotive Power Rail Protection | CAN Bus Transient Suppression |
|---|---|
Use Scenario: 12V/24V battery-fed ECUs exposed to load dump (up to 60V) and jump-start surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed between battery input and DC-DC converter input stage. Use Value: Limits input voltage to ≤38.9V during 1500W transients, preserving regulator integrity and avoiding brownout-induced firmware resets. | Use Scenario: High-speed CAN FD networks in vehicle body control modules subject to EFT and coupling noise. IC Role / Device Role / Timing Role: Bidirectional shunt element across CAN_H/CAN_L differential pair, referenced to ground. Use Value: Clamps common-mode surges to <40V while maintaining signal integrity - no added capacitance degrades >5Mbps data eye. |
| Industrial PLC I/O Protection | LED Driver Surge Immunity |
Use Scenario: 24V digital input channels on programmable logic controllers interfacing with field sensors. IC Role / Device Role / Timing Role: Front-end TVS on each isolated input channel, placed before optocoupler or Schmitt trigger. Use Value: Absorbs 4kV ESD and 1kV EFT bursts per IEC 61000-4-2/4-4, preventing false triggering and latch-up in input conditioning circuitry. | Use Scenario: Constant-current LED drivers in street lighting exposed to lightning-induced surges on AC mains input. IC Role / Device Role / Timing Role: Secondary-level clamp after bridge rectifier, protecting switching MOSFET gate driver ICs. Use Value: Limits transient voltage to 38.9V during 10/1000μs surges, avoiding gate oxide rupture in 40V-rated driver ICs. |
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 (Bourns) | Same DO-214AA package; 600W PPK rating vs. SMCJ24CA's 1500W; lower IPPM (25A) and higher VC (43.5V). | Limited to lower-energy transients; unsuitable for load dump but adequate for ESD/EFT-only environments. | Select SMBJ24CA only when board space constraints require smaller SMB package and surge energy is confirmed ≤600W. |
| 1.5KE24CA (ON Semiconductor) | Through-hole DO-201 package; same 1500W rating but slower thermal response; higher junction-to-ambient RθJA (75°C/W vs. 55°C/W). | Requires larger PCB footprint and less effective heat spreading; not suitable for high-density automotive modules. | Choose 1.5KE24CA only for legacy through-hole designs where rework to SMD is impractical. |
Compared with SMBJ24CA and 1.5KE24CA, the SMCJ24CA delivers superior energy handling in a compact SMD form factor with best-in-class thermal resistance - making it the preferred choice for modern automotive and industrial systems requiring high-reliability, high-power transient suppression in space-constrained layouts.
Availability
SMCJ24CA is available at Aetrix Electronics and suitable for automotive power rail protection, CAN bus transient suppression, and industrial PLC I/O protection requiring stable component supply and full ISO 7637-2 compliance.
Supply support for SMCJ24CA 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, and power management components since 1979.
The SMCJ series is part of TSC's automotive-grade transient suppression portfolio, engineered specifically to meet stringent AEC-Q101 reliability requirements and OEM-level electromagnetic compatibility standards for 12V/24V vehicle systems.
FAQ
What is the clamping voltage of SMCJ24CA at its rated peak pulse current?
The SMCJ24CA has a maximum clamping voltage (VC) of 38.9 V at 40 A peak impulse current (IPPM), measured under the standardized 10/1000 μs double-exponential waveform. This value is critical for ensuring protected ICs remain within their absolute maximum voltage ratings during surge events - for example, confirming compatibility with 40 V-rated CAN transceivers or 36 V-input DC-DC controllers. The SMCJ24CA datasheet specifies this parameter under "ELECTRICAL SPECIFICATIONS" Table with test condition Note 2.
Is SMCJ24CA unidirectional or bidirectional, and how does that affect circuit placement?
The SMCJ24CA is a bidirectional TVS diode, indicated by the "CA" suffix per Taiwan Semiconductor's naming convention. It provides symmetrical clamping in both polarities, eliminating the need to observe orientation during placement - the cathode band marks a common terminal, not polarity. This makes the SMCJ24CA ideal for protecting AC-coupled or floating signal lines like CAN_H/CAN_L or RS-485 differential pairs, unlike unidirectional SMCJ24A which requires correct anode/cathode alignment relative to ground.
Does SMCJ24CA meet automotive EMC standards such as ISO 7637-2?
Yes, the SMCJ24CA is explicitly rated to meet ISO 7637-2 Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (electrical fast transients) per Taiwan Semiconductor's official documentation. Its 1500W peak pulse power rating and sub-1ps response time ensure robust suppression of these defined waveforms - a key requirement for Tier 1 automotive suppliers and ECU manufacturers validating to OEM-specific EMC specifications.
What is the maximum operating junction temperature for SMCJ24CA, and how does thermal resistance impact layout?
The SMCJ24CA has a maximum junction temperature (TJ max) of +150°C and a junction-to-ambient thermal resistance (RθJA) of 55°C/W. To maintain reliability under repeated surges, PCB layout must provide adequate copper area (e.g., ≥100 mm² per pad) and thermal vias to inner ground planes. Exceeding TJ max risks parametric shift and reduced surge lifetime - especially critical in under-hood applications where ambient temperatures exceed 85°C and multiple transients occur in rapid succession.
How does SMCJ24CA compare to SMCJ24A in terms of electrical performance and use cases?
The SMCJ24CA is bidirectional with symmetrical clamping, while the SMCJ24A is unidirectional and must be oriented with cathode toward the protected line's positive side. Electrically, SMCJ24CA has identical VWM (24 V), VBR (26.7–29.5 V), and VC (38.9 V) ratings as SMCJ24A, but differs in application scope: SMCJ24CA suits AC, differential, or floating nodes (e.g., CAN, LIN, RS-485), whereas SMCJ24A is used on DC rails referenced to ground (e.g., 24V supply input). Both share DO-214AB packaging and 1500W rating.
SMCJ24CA 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:
- 2
- 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:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ24CA FAQ
1.How can I place an order for SMCJ24CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ24CA 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 reliable?
The price and inventory of SMCJ24CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ24CA is usually 5 days.
3.What payment methods are accepted for SMCJ24CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ24CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ24CA?
SMCJ24CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ24CA 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?
For technical support, including SMCJ24CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ24CA requirements.
6.How does Aetrix verify that SMCJ24CA is sourced from the original manufacturer or authorized distributors?
All SMCJ24CA 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 meets industry standards.
7.What is the process for return or replacement of SMCJ24CA?
All SMCJ24CA units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ24CA, 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 part is unused and in its original packaging.
Return procedure for SMCJ24CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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