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Taiwan Semiconductor Corporation SMCJ24H
- Part No.:
- SMCJ24H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ24H.pdf
- Description:
- 1500W, 29.7V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:4,860
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Product details
Overview
SMCJ24H from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 24V working stand-off voltage (VWM), 26.7–32.6V breakdown voltage (VBR), and 43.0V maximum clamping voltage (VC) at 36A peak pulse current - designed to protect automotive power rails and industrial I/O interfaces against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ24H datasheet, SMCJ24H pinout, SMCJ24H application, or SMCJ24H equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance values, clamping performance under standardized surge waveforms, and direct alternatives for ESD and load-switching transient suppression in automotive and industrial systems.
Technical Context
The SMCJ24H employs a glass-passivated silicon junction optimized for fast response (<1.0 ps rise time from 0 V to VBR min) and low leakage (<1 µA at 24 V), meeting ISO 7637-2 immunity requirements for automotive electronics. Its unidirectional configuration provides asymmetric protection with forward voltage of 3.5 V at 100 A.
Thermal design is supported by RθJA = 55 °C/W and RθJC = 10 °C/W, enabling reliable operation up to TJ = 150 °C. The device is rated for 200 A non-repetitive forward surge (8.3 ms half-sine) and operates across –55 °C to +150 °C ambient and storage ranges.
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 / 32.6 V @ 1 mA - Confirmed breakdown range defining turn-on threshold tolerance |
| VC @ IPPM | 43.0 V @ 36 A - Clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPK | 1500 W - Peak pulse power handling per single 1 ms transient event |
| IR @ VWM | <1 µA - Minimal leakage ensures negligible standby power loss in 24 V systems |
| TJ max | +150 °C - Junction temperature limit enabling use in under-hood automotive environments |
| RθJA | 55 °C/W - Thermal resistance from junction to ambient, guiding PCB copper area requirements |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, polarity marked by cathode band. Weight: 0.210 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground during overvoltage events |
| Anode | Reference node | Typically tied to system ground or low-impedance return path for clamping action |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| ISO 7637-2 compliance | Tested against Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) |
| Glass passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives |
| Fast response time | <1.0 ps - Ensures clamping activation before sensitive ICs experience overstress |
| Moisture sensitivity level 1 | No bake required prior to reflow; compatible with standard SMT assembly processes |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24 V supply lines in body control modules against load-dump transients and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and DC-DC input stage. Use Value: Limits clamped voltage to 43.0 V during 36 A surges, preventing damage to downstream regulators and microcontrollers. | Use Scenario: Shielding digital input channels on programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Standoff protection element mounted at connector entry point before signal conditioning circuitry. Use Value: Withstands repetitive 10/1000 µs pulses up to 1500 W without degradation, ensuring long-term field reliability. |
| Telecom Power Interface | Motor Drive Control Board |
Use Scenario: Safeguarding PoE-powered equipment front-end converters from lightning-induced surges on Ethernet lines. IC Role / Device Role / Timing Role: Secondary-level TVS on 24 V auxiliary power rail feeding PHY and management ICs. Use Value: Low 1 µA leakage preserves efficiency in always-on telecom applications while maintaining fast clamping. | Use Scenario: Suppressing inductive kickback from solenoid drivers and relay coils in factory automation systems. IC Role / Device Role / Timing Role: Snubber-connected TVS across coil terminals to clamp flyback voltage spikes. Use Value: 200 A surge rating handles high-energy switching events without failure, extending board service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Lower PPK (400 W), smaller SMA package, higher RθJA (95 °C/W) | Not suitable for automotive load-dump or high-energy industrial surges | Select when space-constrained and surge energy is ≤400 W |
| TPSMD24 | Same DO-214AB package, 1500 W rating, but VBR min = 26.7 V and VC = 38.9 V (SMCJ24AH variant) | Lower clamping voltage improves protection margin for 3.3 V/5 V logic powered from 24 V rails | Prefer SMCJ24AH if lower VC is critical; SMCJ24H offers tighter VBR tolerance |
Compared with SMAJ24A, SMCJ24H delivers 275% higher surge power handling and superior thermal dissipation; versus TPSMD24 (SMCJ24AH), it trades slightly higher clamping voltage for improved VBR consistency and AEC-Q101 validation scope.
Availability
SMCJ24H is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, and telecom power interface designs requiring stable component supply, AEC-Q101 qualification, and ISO 7637-2 compliance.
Supply support for SMCJ24H 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 power management devices.
The SMCJ series was developed specifically for high-energy transient suppression in automotive and industrial environments, emphasizing AEC-Q101 reliability, ISO 7637-2 immunity, and robust thermal performance in surface-mount packages.
FAQ
What is the clamping voltage of the SMCJ24H under a 10/1000 µs surge?
The SMCJ24H has a maximum clamping voltage (VC) of 43.0 V at 36 A peak pulse current (IPPM), measured using the standardized 10/1000 µs double-exponential waveform per IEC 61000-4-5 and ISO 7637-2. This value defines the upper voltage limit imposed on protected circuits during transient events and is confirmed in the manufacturer's Electrical Specifications table.
Is the SMCJ24H AEC-Q101 qualified?
Yes, the SMCJ24H is explicitly AEC-Q101 qualified, as stated in the FEATURES section of the official Taiwan Semiconductor datasheet. This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD, confirming suitability for automotive electronic control units and powertrain-related applications.
What is the difference between SMCJ24H and SMCJ24AH?
The SMCJ24AH has a tighter breakdown voltage range (26.7–29.5 V vs. 26.7–32.6 V for SMCJ24H) and lower clamping voltage (38.9 V vs. 43.0 V), achieved via tighter process control. Both share identical package, power rating (1500 W), and AEC-Q101 qualification, but SMCJ24AH offers improved consistency for precision-clamping applications.
Can the SMCJ24H be used in bidirectional configurations?
No - the SMCJ24H is unidirectional only. For bidirectional operation, Taiwan Semiconductor specifies part numbers with CH or CAH suffixes (e.g., SMCJ24CH). Using SMCJ24H in reverse-biased mode beyond its specified VWM risks permanent junction damage due to lack of symmetrical avalanche capability.
What is the thermal resistance from junction to ambient for the SMCJ24H?
The SMCJ24H has a junction-to-ambient thermal resistance (RθJA) of 55 °C/W, measured under standard JEDEC test conditions (single device on 1-inch² FR-4 board with 2 oz copper). This value guides PCB layout decisions, such as minimum copper pour area needed to maintain TJ ≤ 150 °C under sustained power dissipation.
SMCJ24H 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 43V
- Current - Peak Pulse (10/1000µs):
- 36A
- 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)
SMCJ24H FAQ
1.How can I place an order for SMCJ24H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ24H 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 SMCJ24H reliable?
The price and inventory of SMCJ24H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ24H is usually 5 days.
3.What payment methods are accepted for SMCJ24H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ24H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ24H?
SMCJ24H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ24H 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 SMCJ24H?
For technical support, including SMCJ24H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ24H requirements.
6.How does Aetrix verify that SMCJ24H is sourced from the original manufacturer or authorized distributors?
All SMCJ24H 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 SMCJ24H meets industry standards.
7.What is the process for return or replacement of SMCJ24H?
All SMCJ24H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ24H, 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 SMCJ24H part is unused and in its original packaging.
Return procedure for SMCJ24H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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