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Taiwan Semiconductor Corporation SMDJ40CA
- Part No.:
- SMDJ40CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ40CA.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,984
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Product details
Overview
SMDJ40CA from Taiwan Semiconductor is a bidirectional 40V standoff transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 3000W peak pulse power, 64.5V maximum clamping voltage at 46.5A peak current, and -55°C to +175°C operating junction temperature. It protects telecom, industrial, and consumer electronics against ESD, lightning-induced transients, and load-switching surges.
For engineers reviewing the SMDJ40CA datasheet, SMDJ40CA pinout, SMDJ40CA application, or SMDJ40CA equivalent, key selection criteria include bidirectional clamping symmetry, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, 1µA max reverse leakage at 40V, and DO-214AB thermal performance (RθJA = 75°C/W).
Technical Context
The SMDJ40CA employs a glass-passivated silicon junction optimized for high-energy transient suppression in automotive and industrial environments. Its bidirectional configuration ensures symmetrical clamping in both polarities, with breakdown voltage specified at 44.4–49.1V (min/max) under 1mA test current.
It delivers 3000W peak pulse power per 10/1000µs waveform (per Fig.5), supports 300A non-repetitive forward surge (8.3ms half-sine), and maintains stable clamping up to 175°C junction temperature - validated per JEDEC JESD201 Class 2 whisker testing and J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse working voltage before clamping initiates |
| VBR @ IT=1mA | 44.4–49.1 V - Confirmed breakdown threshold ensuring reliable turn-on during transients |
| VC @ IPPM=46.5A | 64.5 V - Clamping voltage limiting downstream circuit stress during 3000W surge events |
| PPK | 3000 W - Peak pulse power handling capability per 10/1000µs waveform (IEC 61000-4-5) |
| IPPM | 46.5 A - Peak impulse current supported without degradation |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance enabling PCB-level thermal management |
| TJ Range | -55°C to +175°C - Full operational range suitable for under-hood and industrial ambient conditions |
Pinout & Package
DO-214AB (SMC) surface-mount package with matte tin-plated leads, polarity indicated by cathode band (bidirectional operation eliminates functional polarity dependency). Weight: 0.290g. UL 94V-0 compliant molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | Both terminals function identically - no directional mounting requirement for AC or bipolar surge protection |
| Case (body) | Thermal and mechanical interface | DO-214AB body provides primary heat dissipation path to PCB copper; no internal ground or control pins |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for Pulse 1, 2a, 2b, 3a, and 3b - meets automotive EMC immunity requirements without external filtering |
| Sub-1ps response time | Enables clamping before sensitive ICs experience overvoltage - critical for protecting high-speed interfaces |
| Glass passivated junction | Ensures long-term reliability and stable VBR under thermal cycling and humidity exposure |
| J-STD-020 Level 1 MSL | Zero bake requirement prior to reflow - compatible with standard SMT assembly processes |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive - suitable for green manufacturing programs |
Applications
| Automotive Power Line Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 12V/24V CAN/LIN bus lines and sensor inputs in engine control units against load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector entry point to shunt energy before reaching transceivers or microcontrollers. Use Value: Limits induced voltage to ≤64.5V during 3000W pulses, preventing latch-up or gate oxide damage in downstream ASICs. | Use Scenario: Safeguarding analog input channels (4–20mA, 0–10V) and digital outputs on programmable logic controller modules exposed to field wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on terminal blocks and signal conditioning front-ends. Use Value: Withstands repeated 46.5A impulses while maintaining <1µA leakage at 40V - preserves measurement accuracy and system uptime. |
| Telecom Base Station DC Feeds | Consumer Audio/Video Interface Ports |
Use Scenario: Protecting -48V DC power inputs and RS-485 backhaul links in outdoor telecom cabinets subjected to lightning-induced ground potential rise. IC Role / Device Role / Timing Role: High-power bidirectional TVS mounted on power entry PCB section to absorb common-mode surges. Use Value: 3000W rating and 175°C junction rating enable operation in uncooled enclosures with >85°C ambient temperatures. | Use Scenario: Shielding HDMI, USB, and audio jack connectors in smart TVs and AV receivers from ESD events (>15kV contact discharge per IEC 61000-4-2). IC Role / Device Role / Timing Role: Secondary-level TVS placed after EMI filters to catch fast-rising ESD that bypasses ferrites. Use Value: Sub-1ps response captures ESD nanosecond edges before they couple into high-impedance receiver inputs. |
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 (Littelfuse) | Same 40V VWM, 64.5V VC, but lower PPK = 1500W; DO-214AB package | Limited to lower-energy transients (e.g., IEC 61000-4-2 ESD only); not rated for ISO 7637-2 Pulse 5a load dump | Select SMDJ40CA when full 3000W automotive-grade surge immunity is required. |
| 1.5KE40CA (ON Semiconductor) | Through-hole DO-201 package; identical electrical specs but higher RθJA (~100°C/W) and no J-STD-020 Level 1 rating | Not suitable for high-volume automated SMT lines; requires wave solder or hand assembly | Choose SMDJ40CA for surface-mount production, thermal performance, and moisture robustness. |
Compared with SAC40CA and 1.5KE40CA, the SMDJ40CA uniquely combines 3000W surge rating, DO-214AB SMT compatibility, ISO 7637-2 qualification, and Level 1 MSL - making it the only option qualified for high-reliability automotive and industrial SMT deployments requiring zero post-reflow bake and full load-dump immunity.
Availability
SMDJ40CA is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLCs, and telecom base station power supplies requiring stable component supply across multi-year production cycles.
Supply support for SMDJ40CA 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 for industrial, automotive, and computing markets.
The SMDJ series was engineered specifically for high-energy transient suppression in harsh-environment applications - emphasizing robustness, AEC-Q200 readiness, and seamless integration into automated SMT lines.
FAQ
What is the maximum clamping voltage of the SMDJ40CA under rated surge conditions?
The SMDJ40CA has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current of 46.5 A (10/1000 µs waveform). This value is measured per IEC 61000-4-5 and guarantees downstream circuit protection within safe voltage margins. The SMDJ40CA maintains this clamping performance across its full operating temperature range (-55°C to +175°C), making it suitable for under-hood and industrial environments where thermal stability is critical.
Is the SMDJ40CA unidirectional or bidirectional, and how does that affect PCB layout?
The SMDJ40CA is a bidirectional TVS diode, indicated by the "CA" suffix, meaning it provides symmetrical clamping in both polarities. Unlike unidirectional variants, it has no functional anode/cathode distinction - the marking band is purely mechanical and does not dictate orientation. This allows flexible PCB placement without polarity verification, simplifying layout and reducing assembly errors. The SMDJ40CA's bidirectional behavior is confirmed in its electrical specifications table, where identical VBR, VWM, and VC values apply in both directions.
Does the SMDJ40CA meet automotive EMC standards such as ISO 7637-2?
Yes, the SMDJ40CA is explicitly rated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements - covering typical automotive transients including battery disconnect, alternator load dump, and capacitive coupling noise. This qualification is stated in the official Taiwan Semiconductor datasheet (Version I2104) and verified through standardized surge waveform testing. For designs targeting AEC-Q200 compliance, the SMDJ40CA serves as a foundational protection element, though full qualification requires system-level validation.
What is the thermal resistance profile of the SMDJ40CA, and how does it impact PCB design?
The SMDJ40CA has a junction-to-ambient thermal resistance (RθJA) of 75°C/W and junction-to-lead resistance (RθJL) of 15°C/W, measured in the DO-214AB (SMC) package. These values require adequate PCB copper area (≥100 mm² per pad recommended) and thermal vias to maintain TJ ≤175°C during repetitive surges. The SMDJ40CA's low RθJL enables efficient heat transfer to the PCB ground plane, supporting high-reliability operation in compact, thermally constrained layouts where the SMDJ40CA is deployed.
Can the SMDJ40CA replace older SMAJ40CA or P4SMA40CA devices in existing designs?
The SMDJ40CA is not a direct drop-in replacement for SMAJ40CA or P4SMA40CA due to differences in package size (DO-214AB vs. DO-214AC), power rating (3000W vs. 400W), and thermal performance. While all share the same VWM and VC, the SMDJ40CA's larger SMC footprint and higher surge capacity require PCB pad revision and layout review. Engineers upgrading to SMDJ40CA must verify mechanical clearance, thermal relief, and current-handling capability - the SMDJ40CA delivers superior protection but is not mechanically or electrically interchangeable without design modification.
SMDJ40CA 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ40CA FAQ
1.How can I place an order for SMDJ40CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ40CA 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 SMDJ40CA reliable?
The price and inventory of SMDJ40CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ40CA is usually 5 days.
3.What payment methods are accepted for SMDJ40CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ40CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ40CA?
SMDJ40CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ40CA 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 SMDJ40CA?
For technical support, including SMDJ40CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ40CA requirements.
6.How does Aetrix verify that SMDJ40CA is sourced from the original manufacturer or authorized distributors?
All SMDJ40CA 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 SMDJ40CA meets industry standards.
7.What is the process for return or replacement of SMDJ40CA?
All SMDJ40CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ40CA, 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 SMDJ40CA part is unused and in its original packaging.
Return procedure for SMDJ40CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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