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Taiwan Semiconductor Corporation SMCJ40CAH
- Part No.:
- SMCJ40CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40CAH.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,647
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Product details
Overview
SMCJ40CAH from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 40V working stand-off voltage (VWM), 44.4–49.1V breakdown voltage (VBR), and 64.5V maximum clamping voltage (VC) at 24A peak pulse current - deployed for ESD and surge protection in automotive power lines and industrial I/O interfaces.
For engineers reviewing the SMCJ40CAH datasheet, SMCJ40CAH pinout, SMCJ40CAH application, or SMCJ40CAH equivalent, this device delivers AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, <1μA reverse leakage above 10V, and halogen-free RoHS-compliant construction - critical for high-reliability 12V/24V system protection.
Technical Context
The SMCJ40CAH is a bipolar (bidirectional) TVS diode designed to protect sensitive electronics against fast transient overvoltages in both polarities without requiring external polarity management. Its glass-passivated junction ensures stable VBR tolerance and low leakage across temperature.
It operates within -55°C to +150°C junction range, features 10°C/W junction-to-case thermal resistance, and sustains 1500W non-repetitive peak pulse power per 1ms 10/1000μs waveform - validated under ISO 7637-2 test conditions including load dump and inductive switching transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 44.4 V / 49.1 V @ 1 mA - Confirmed breakdown threshold range ensuring reliable turn-on margin above VWM |
| VC @ IPPM | 64.5 V @ 24 A - Clamped voltage during 10/1000μs surge, limiting downstream stress to safe levels |
| PPK | 1500 W - Peak pulse power handling capacity defines robustness against automotive load dump events |
| IR @ VWM | <1 μA - Ultra-low leakage preserves signal integrity and minimizes standby power loss |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and industrial enclosures |
| RθJC | 10 °C/W - Supports thermal design with minimal heatsinking for PCB-mounted surge protection |
Pinout & Package
DO-214AB (SMC) surface-mount package: molded epoxy case rated UL 94V-0, matte tin-plated leads, polarity indicated by cathode band (not applicable for bidirectional SMCJ40CAH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | Both terminals function identically - no polarity sensitivity; connects across protected line and ground or differential pair |
| Case | Non-electrical mechanical interface | DO-214AB body provides mechanical anchoring and thermal path; no electrical connection |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and HTRB testing |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect/load dump), and Pulse 3a/3b (capacitive coupling) waveforms |
| Sub-1 ps response time | Clamps transients before sensitive ICs experience damaging overvoltage - critical for CAN/LIN bus protection |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally compliant manufacturing |
| Moisture sensitivity level 1 | No baking required prior to reflow; compatible with standard SMT assembly processes per J-STD-020 |
Applications
| Automotive Power Line Protection | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting 12V/24V supply rails in engine control units (ECUs), body control modules (BCMs), and infotainment systems from load dump and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between power rail and chassis ground to shunt transient energy. Use Value: Limits rail voltage to ≤64.5V during 24A ISO 7637-2 Pulse 5a events, preventing damage to 36V-rated DC-DC converters and microcontrollers. | Use Scenario: Safeguarding RS-485, CAN FD, and digital input channels in PLCs and motor drives from ESD and field-induced surges. IC Role / Device Role / Timing Role: Line-to-ground TVS on differential data lines, providing symmetric clamping without signal distortion. Use Value: Sub-1ps response ensures clamping occurs before ±8kV contact ESD pulses propagate into transceivers, preserving data integrity. |
| Telecom AC/DC Power Input | Consumer Equipment Surge Immunity |
Use Scenario: Secondary-side surge suppression on 48V telecom power supplies exposed to lightning-induced surges on PoE or battery backup lines. IC Role / Device Role / Timing Role: Parallel-connected TVS across output capacitor to clamp fast-rising transients before reaching downstream regulators. Use Value: 1500W peak power rating handles 10/1000μs surges up to 24A while maintaining VWM = 40V - ideal for 48V nominal systems with 20% tolerance. | Use Scenario: Front-end protection of USB-C PD ports, HDMI inputs, and audio jacks in smart TVs and set-top boxes against user-handling ESD. IC Role / Device Role / Timing Role: Low-capacitance bidirectional suppressor placed directly at connector entry point. Use Value: <1μA leakage avoids loading high-impedance analog/audio paths; DO-214AB footprint enables compact layout near connectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40CA | 600W peak power rating, SMB package (smaller footprint, higher thermal resistance) | Lower surge immunity; suitable only for consumer-grade or low-energy transients | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2 ±8kV contact |
| 1.5KE40CA | Through-hole DO-201 package, same 1500W rating but slower response (~1ns) and higher leakage | Not AEC-Q101 qualified; unsuitable for automotive production | Choose for legacy through-hole designs where rework cost outweighs performance trade-offs |
Compared with SMBJ40CA and 1.5KE40CA, the SMCJ40CAH delivers superior automotive-grade reliability (AEC-Q101), faster clamping (<1ps), lower leakage (<1μA), and optimized SMT manufacturability - making it the preferred choice for new 12V/24V automotive and industrial designs requiring ISO 7637-2 compliance.
Availability
SMCJ40CAH is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, telecom power supplies, and consumer HDMI/USB-C interface protection requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ40CAH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs - headquartered in Hsinchu, Taiwan.
The SMCJ series is engineered specifically for high-energy transient suppression in automotive and industrial environments, emphasizing AEC-Q101 reliability, ISO 7637-2 compliance, and robust SMT packaging for automated assembly.
FAQ
What does the 'CA' suffix indicate in SMCJ40CAH?
The 'CA' suffix in SMCJ40CAH denotes a bidirectional configuration - meaning the device functions identically in both forward and reverse directions, with symmetrical clamping behavior. This eliminates polarity concerns during placement and makes it ideal for protecting AC-coupled or differential signal lines such as CAN, RS-485, or telecom interfaces. The 'H' indicates halogen-free construction per IEC 61249-2-21.
How does SMCJ40CAH differ from unidirectional SMCJ40AH?
The SMCJ40CAH is bidirectional, while SMCJ40AH is unidirectional. Unidirectional types require correct anode/cathode orientation relative to circuit polarity and exhibit asymmetric behavior - conducting only in reverse bias. Bidirectional SMCJ40CAH clamps equally in both directions, simplifying layout and enabling use in AC or floating systems. Both share identical VWM (40V), VBR (44.4–49.1V), and VC (64.5V) specs.
Is SMCJ40CAH suitable for ISO 7637-2 Pulse 5a (load dump) protection?
Yes, SMCJ40CAH is explicitly validated for ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b - and its 1500W peak power rating and 64.5V clamping voltage at 24A make it appropriate for mitigating lower-energy load dump transients in 12V systems. For full Pulse 5a (up to 60V/100ms), pairing with a TVS array or additional regulation is recommended - but SMCJ40CAH remains a primary front-line protector.
What is the maximum junction temperature and thermal resistance of SMCJ40CAH?
The SMCJ40CAH has a maximum junction temperature (TJ) of +150°C and a junction-to-case thermal resistance (RθJC) of 10°C/W. These values enable reliable operation in under-hood automotive environments and enclosed industrial enclosures. With proper PCB copper area (≥1 cm² per pad), it can dissipate sufficient heat during repetitive surge events without exceeding thermal limits.
Does SMCJ40CAH require special handling or moisture baking before SMT assembly?
No - SMCJ40CAH is rated at Moisture Sensitivity Level 1 (MSL-1) per J-STD-020, meaning it can be stored indefinitely at ambient conditions and placed directly into reflow without baking or dry-pack requirements. Its DO-214AB (SMC) package uses moisture-resistant molding compound, supporting standard automated SMT processes without process modification.
SMCJ40CAH 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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 24A
- 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)
SMCJ40CAH FAQ
1.How can I place an order for SMCJ40CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40CAH 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 SMCJ40CAH reliable?
The price and inventory of SMCJ40CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40CAH is usually 5 days.
3.What payment methods are accepted for SMCJ40CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40CAH?
SMCJ40CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40CAH 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 SMCJ40CAH?
For technical support, including SMCJ40CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40CAH requirements.
6.How does Aetrix verify that SMCJ40CAH is sourced from the original manufacturer or authorized distributors?
All SMCJ40CAH 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 SMCJ40CAH meets industry standards.
7.What is the process for return or replacement of SMCJ40CAH?
All SMCJ40CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40CAH, 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 SMCJ40CAH part is unused and in its original packaging.
Return procedure for SMCJ40CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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