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Taiwan Semiconductor Corporation SMCJ40H
- Part No.:
- SMCJ40H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40H.pdf
- Description:
- 1500W, 49.4V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:4,372
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Product details
Overview
SMCJ40H from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 40V working stand-off voltage (VWM), 44.4–54.3V breakdown voltage (VBR), and 71.4V maximum clamping voltage (VC) at 22A 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 SMCJ40H datasheet, SMCJ40H pinout, SMCJ40H application, or SMCJ40H equivalent, this device is evaluated for ESD immunity, load-dump suppression, and lightning-induced surge protection in AEC-Q101-compliant automotive electronics, telecom front-ends, and industrial PLC modules where fast response (<1.0 ps), low leakage (<1 µA @ 40V), and robust 150°C junction operation are required.
Technical Context
The SMCJ40H employs a glass-passivated silicon junction optimized for high-energy transient absorption in unidirectional configuration. Its clamping behavior follows IEEE C62.35 standards, with thermal resistance RθJA = 55°C/W and RθJC = 10°C/W enabling reliable operation under sustained ambient temperatures up to +125°C when mounted on 1-in² copper area.
It delivers 1500W peak pulse power (tp = 1 ms, 10/1000 µs waveform), supports 200A non-repetitive forward surge (8.3 ms half-sine), and maintains VF = 3.5V @ 100A - consistent with SMCJ5.0H–SMCJ90H series devices per datasheet Note 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC bias margin for 48V automotive systems. |
| VBR min/max | 44.4 V / 54.3 V @ 1 mA - Verified breakdown range ensures consistent turn-on across production lots and temperature extremes. |
| VC @ IPPM | 71.4 V @ 22 A - Clamping voltage during 10/1000 µs surge; limits downstream IC stress to <72 V under worst-case 1500W transient. |
| PPK | 1500 W - Peak pulse power rating per 1 ms pulse; enables protection against severe ISO 7637-2 Pulse 5a (load dump). |
| IR @ VWM | <1 µA @ 40 V - Ultra-low reverse leakage preserves signal integrity and battery drain in always-on circuits. |
| TJ max | +150 °C - Junction temperature limit supporting under-hood automotive placement without derating at full power. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, polarity indicated by cathode band. Weight: 0.210 g. Meets UL 94V-0 and JESD201 Class 2 whisker requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path; conducts during reverse-transient clamping. |
| Cathode | Transient clamp input | Connected to protected line (e.g., 48V rail); absorbs energy by avalanche breakdown when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) waveforms. |
| Glass passivated junction | Ensures stable VBR over lifetime and humidity exposure; eliminates risk of metallization corrosion in harsh environments. |
| Fast response time | <1.0 ps rise-to-breakdown - faster than typical MOVs or polymer TVS, minimizing overshoot during ESD events. |
| Moisture sensitivity level | MSL Level 1 (per J-STD-020) - no floor life limitation; suitable for standard SMT reflow without baking. |
Applications
| Automotive Power Rail Protection | Industrial I/O Interface Protection |
|---|---|
|
Use Scenario: Protecting 48V battery-fed ECUs and ADAS domain controllers from load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between supply rail and chassis ground to clamp transients above 44.4V while maintaining 40V operational margin. Use Value: Limits peak voltage to 71.4V during 1500W ISO 7637-2 Pulse 5a, preventing damage to 75V-rated MOSFETs and PMICs. |
Use Scenario: Shielding RS-485/RS-232 ports on PLC backplanes from induced lightning surges and ESD. IC Role / Device Role / Timing Role: Line-to-ground clamping element on differential bus lines, activated within sub-nanosecond upon overvoltage detection. Use Value: Achieves <1 µA leakage at 40V stand-off, preserving signal integrity and common-mode range in high-impedance receivers. |
| Telecom Front-End Surge Suppression | Consumer Equipment ESD Hardening |
|
Use Scenario: Safeguarding PoE-powered Ethernet switches and base station RF front-ends against AC-line coupled transients. IC Role / Device Role / Timing Role: Primary-level TVS on DC input stage, absorbing energy before it reaches DC-DC converters and LDOs. Use Value: Withstands 200A 8.3ms surge (IFSM), enabling robustness against repeated grid-coupled disturbances without degradation. |
Use Scenario: Adding board-level ESD immunity to USB-C power delivery circuits and HDMI hot-plug interfaces. IC Role / Device Role / Timing Role: Standoff-clamp TVS on VBUS line, triggered only during >44.4V ESD events while remaining invisible during normal 5–20V PD operation. Use Value: Delivers 1500W peak power handling in compact DO-214AB footprint - 3× higher than standard SMAJ devices at same voltage grade. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40A | Lower PPK (600W), smaller SMB package (DO-214AA), VBR = 44.4–49.1V, VC = 64.5V @ 24A. | Better suited for space-constrained consumer PCBs; insufficient for ISO 7637-2 Pulse 5a automotive load dump. | Select SMBJ40A only when peak power demand ≤600W and board area is critical; verify thermal derating at TA > 85°C. |
| 1.5KE40A | Through-hole TO-218 package, same VWM/VBR/VC specs, but slower response (>1 ns), higher IR (5 µA), and no AEC-Q101 qualification. | Acceptable for industrial mains-input protection where vibration resistance and automated assembly are not required. | Choose 1.5KE40A for legacy through-hole designs or cost-sensitive non-automotive applications; avoid in AEC-Q101 programs. |
Compared with SMBJ40A and 1.5KE40A, the SMCJ40H provides superior surge robustness (1500W vs. 600W/1500W), automotive qualification, and surface-mount compatibility - making it the preferred choice for new AEC-Q101-compliant designs requiring high-energy clamping in minimal footprint.
Availability
SMCJ40H is available at Aetrix Electronics and suitable for automotive ECU protection, industrial I/O hardening, and telecom surge suppression requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMCJ40H 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 MOSFETs for automotive and industrial markets.
The SMCJ series was developed to meet stringent AEC-Q101 and ISO 7637-2 requirements for high-power transient suppression in next-generation 48V automotive architectures and ruggedized industrial control systems.
FAQ
What is the clamping voltage of SMCJ40H under a 10/1000 µs surge?
The SMCJ40H has a maximum clamping voltage (VC) of 71.4 V at 22 A peak pulse current (IPPM), measured using the standardized 10/1000 µs double-exponential waveform per IEC 61000-4-5 and IEEE C62.35. This value ensures downstream components see no more than 71.4 V during worst-case transient events, directly supporting design margin calculations for 75V-rated power stages.
Is SMCJ40H suitable for bidirectional transient protection?
No, SMCJ40H is a unidirectional TVS diode intended for DC-biased lines like automotive 48V rails or positive-supply I/O. For bidirectional protection, Taiwan Semiconductor offers the SMCJ40CH variant (with CH suffix), which provides symmetrical clamping in both polarities and matches the same VWM, VBR, and PPK ratings as SMCJ40H.
Does SMCJ40H require derating at elevated ambient temperatures?
Yes - the SMCJ40H's peak pulse power must be derated above TA = 25°C per Figure 2 in the datasheet. At 100°C ambient, its 1500W rating drops to approximately 750W due to thermal limitations, governed by RθJA = 55°C/W. Adequate PCB copper area (≥1 in²) is required to maintain performance at high temperatures.
What is the forward voltage drop of SMCJ40H at high current?
The SMCJ40H exhibits a forward voltage (VF) of 3.5 V at 100 A, consistent with the SMCJ5.0H–SMCJ90H family per datasheet Note 2. This low VF minimizes conduction loss during high-current surge events and supports reliable operation in fault conditions where forward conduction occurs.
How does SMCJ40H compare to SMCJ40AH in terms of breakdown voltage tolerance?
The SMCJ40H has a VBR range of 44.4–54.3 V (min/max), while SMCJ40AH tightens this to 44.4–49.1 V - reducing the upper bound by 5.2 V. This narrower tolerance improves predictability in precision clamping applications but does not affect VWM (40 V), VC (71.4 V), or PPK (1500 W), meaning SMCJ40H remains the standard version for general-purpose use.
SMCJ40H 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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 71.4V
- Current - Peak Pulse (10/1000µs):
- 22A
- 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)
SMCJ40H FAQ
1.How can I place an order for SMCJ40H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40H 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 SMCJ40H reliable?
The price and inventory of SMCJ40H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40H is usually 5 days.
3.What payment methods are accepted for SMCJ40H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40H?
SMCJ40H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40H 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 SMCJ40H?
For technical support, including SMCJ40H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40H requirements.
6.How does Aetrix verify that SMCJ40H is sourced from the original manufacturer or authorized distributors?
All SMCJ40H 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 SMCJ40H meets industry standards.
7.What is the process for return or replacement of SMCJ40H?
All SMCJ40H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40H, 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 SMCJ40H part is unused and in its original packaging.
Return procedure for SMCJ40H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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