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Taiwan Semiconductor Corporation SMDJ40CAH
- Part No.:
- SMDJ40CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ40CAH.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,592
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Product details
Overview
SMDJ40CAH from Taiwan Semiconductor is a bidirectional 40V stand-off transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 3000W peak pulse power, 64.5V clamping voltage at 46.5A peak current, and -55°C to +175°C operating junction temperature. It provides robust ESD and surge protection for automotive power lines and industrial I/O interfaces.
For engineers reviewing the SMDJ40CAH datasheet, SMDJ40CAH pinout, SMDJ40CAH application, or SMDJ40CAH equivalent, key selection criteria include bidirectional clamping behavior, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, AEC-Q101 qualification, 1.0ps response time, and DO-214AB mechanical compatibility with automated SMT assembly.
Technical Context
SMDJ40CAH is a glass-passivated, bipolar junction TVS diode designed for unidirectional or bidirectional transient suppression in DC power rails and signal lines. Its symmetrical breakdown (44.4–49.1V) and clamping (64.5V @ 46.5A) characteristics are specified under 10/1000μs waveform per R.E.A., with thermal resistance of 75°C/W (junction-to-ambient) and 15°C/W (junction-to-lead).
The device operates across -55°C to +175°C junction temperature range, supports 300A non-repetitive forward surge (8.3ms half-sine), and exhibits ≤1μA reverse leakage at 40V working stand-off voltage. It meets J-STD-020 moisture sensitivity level 1 and JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse working voltage before clamping initiates |
| VBR min/max | 44.4 V / 49.1 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 64.5 V - Clamped voltage during 46.5 A 10/1000μs surge, limiting downstream stress |
| PPK | 3000 W - Peak pulse power handling capability per single transient event |
| TJ max | +175 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| Response time | <1.0 ps - Sub-picosecond junction response ensures protection before sensitive ICs are damaged |
Pinout & Package
DO-214AB (SMC) surface-mount package with matte tin-plated leads; polarity indicated by cathode band (not applicable for bidirectional SMDJ40CAH - symmetrical terminals).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient path | Either terminal serves as input/output - no polarity dependency for surge conduction |
| Case (cathode band absent) | Thermal and mechanical anchor | DO-214AB body provides heat dissipation path and mechanical stability on PCB |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line spikes) |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal and humidity stress |
| Level 1 moisture sensitivity | Zero bake requirement prior to reflow - compatible with standard SMT assembly lines |
Applications
| Automotive Power Line Protection | Industrial PLC Digital I/O |
|---|---|
Use Scenario: Protecting 12V/24V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between power rail and ground to shunt surges exceeding 40V. Use Value: Limits voltage to ≤64.5V during 3000W transients, preventing damage to MCU power supplies and CAN transceivers. | Use Scenario: Shielding 24V digital input modules from field-wiring induced surges and ESD events. IC Role / Device Role / Timing Role: Front-end transient suppressor on isolated input channels before optocoupler or buffer IC. Use Value: Withstands repeated 1kV/500A surges per IEC 61000-4-5 while maintaining <1μA leakage at 24V nominal. |
| Telecom Base Station DC Feeds | Renewable Energy Inverter Control Boards |
Use Scenario: Safeguarding 48V DC power inputs in outdoor telecom cabinets exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main DC bus before DC-DC converters and monitoring ICs. Use Value: 3000W rating handles multi-kA induced surges; 175°C TJ max supports operation in sealed, high-ambient enclosures. | Use Scenario: Protecting microcontroller-based gate drivers and sensor interfaces in solar inverters subject to grid switching transients. IC Role / Device Role / Timing Role: Secondary-level TVS on auxiliary 12V/15V control rails feeding PWM controllers and isolation amplifiers. Use Value: Fast <1ps response prevents latch-up in SiC MOSFET drivers; RoHS/halogen-free compliance meets PV system environmental requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC40CA | Lower PPK (1500W), higher VC (70V @ 21.4A), same DO-214AB package | Not suitable for ISO 7637-2 Pulse 1 (load dump); limited to lower-energy transients | Select only when surge energy is constrained and cost is prioritized over automotive robustness |
| SMLJ40CA | Same VWM/VC specs, but 4000W PPK rating and tighter VBR tolerance (±5% vs ±10%) | Higher surge margin enables extended lifetime in high-cycle industrial environments | Preferred where long-term reliability under repetitive surges is critical, despite higher unit cost |
Compared with SMDJ40CAH, SAC40CA offers reduced surge capacity and less stringent automotive qualification, while SMLJ40CA delivers higher peak power headroom and tighter parametric control - both require validation against the specific transient profile and layout parasitics of the target design.
Availability
SMDJ40CAH is available at Aetrix Electronics and suitable for automotive electronics, industrial programmable logic controllers, and telecom infrastructure requiring stable component supply with full traceability and lifecycle management.
Supply support for SMDJ40CAH 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, with global distribution and AEC-Q101 certified production lines.
The SMDJ series was developed specifically for high-energy transient suppression in automotive and industrial systems, emphasizing rugged packaging, fast response, and standardized compliance with ISO 7637-2 and AEC-Q101.
FAQ
What does the "CAH" suffix indicate in SMDJ40CAH?
The "CAH" suffix denotes a bidirectional configuration - meaning SMDJ40CAH has symmetrical breakdown and clamping characteristics in both polarities, unlike the unidirectional "AH" variant. This enables use in AC-coupled or floating signal paths without polarity concerns, and is confirmed by identical VBR min/max and VC values in both directions per the datasheet's electrical specifications table.
Is SMDJ40CAH compliant with AEC-Q101 and ISO 7637-2?
Yes, SMDJ40CAH is explicitly AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements as stated in the FEATURES section. These qualifications are verified through TSC's official qualification reports and apply directly to the SMDJ40CAH part number, not just the family.
What is the maximum clamping voltage of SMDJ40CAH under surge conditions?
The maximum clamping voltage of SMDJ40CAH is 64.5 V, measured at 46.5 A peak pulse current under the standard 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events.
Can SMDJ40CAH be used in place of a unidirectional TVS like SMDJ40AH?
No - SMDJ40CAH is bidirectional and lacks polarity marking, while SMDJ40AH is unidirectional with a defined cathode band. Substituting SMDJ40CAH for SMDJ40AH in DC circuits with polarity-sensitive components (e.g., electrolytic capacitors or diode-OR'd supplies) may cause unintended conduction or failure. Layout and schematic review is required before interchange.
What is the thermal resistance and maximum steady-state power dissipation of SMDJ40CAH?
SMDJ40CAH has a junction-to-ambient thermal resistance (RθJA) of 75°C/W and a junction-to-lead resistance (RθJL) of 15°C/W. Its steady-state power dissipation at TA = 25°C is 6.5 W - this rating applies only to continuous DC or low-frequency conditions, not transient suppression duty cycles.
SMDJ40CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMDJ
- 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):
- 46.5A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ40CAH FAQ
1.How can I place an order for SMDJ40CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ40CAH 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 SMDJ40CAH reliable?
The price and inventory of SMDJ40CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ40CAH is usually 5 days.
3.What payment methods are accepted for SMDJ40CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ40CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ40CAH?
SMDJ40CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ40CAH 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 SMDJ40CAH?
For technical support, including SMDJ40CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ40CAH requirements.
6.How does Aetrix verify that SMDJ40CAH is sourced from the original manufacturer or authorized distributors?
All SMDJ40CAH 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 SMDJ40CAH meets industry standards.
7.What is the process for return or replacement of SMDJ40CAH?
All SMDJ40CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ40CAH, 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 SMDJ40CAH part is unused and in its original packaging.
Return procedure for SMDJ40CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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