My Inquiry
My Account
Taiwan Semiconductor Corporation SMCJ40CA
- Part No.:
- SMCJ40CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40CA.pdf
- Description:
- TVS DIODE 40VWM 64.5VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:35,332
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ40CA from Taiwan Semiconductor is a bidirectional 1500W transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, designed for high-energy surge protection in automotive and industrial power rails. It features a 40V working stand-off voltage (VWM), 44.4–49.1V breakdown voltage (VBR), and clamps transients to ≤64.5V at 24A peak pulse current (IPPM), meeting ISO 7637-2 Pulse 1/2a/2b/3a/3b.
For engineers reviewing the SMCJ40CA datasheet, SMCJ40CA pinout, SMCJ40CA application, or SMCJ40CA equivalent, this device is selected for robust ESD and electrical fast transient (EFT) immunity in 12V/24V DC systems, inductive load switching protection, and lighting circuit safeguarding where sub-1ps response and <1µA leakage above 10V are critical.
Technical Context
The SMCJ40CA uses a glass-passivated silicon junction optimized for unidirectional or bidirectional clamping without polarity dependency-enabled by its CA suffix denoting bipolar configuration. Its thermal design supports 150°C maximum junction temperature with RθJC = 10°C/W and RθJA = 55°C/W, enabling reliable operation under repetitive surge stress when mounted on thermally adequate PCB copper.
It delivers 1500W peak pulse power (tp = 1ms) per IEC 61000-4-5 and ISO 7637-2 waveforms, with clamping voltage tightly controlled at 64.5V (max) at 24A, ensuring downstream ICs remain within safe operating voltage margins during 8/20µs or 10/1000µs transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse voltage before clamping begins; sets system operating margin for 12V/24V DC bus applications. |
| VBR min/max | 44.4 V / 49.1 V @ IT = 1 mA - Confirmed breakdown threshold range ensures predictable turn-on across production lots. |
| VC @ IPPM | 64.5 V @ 24 A - Clamping voltage under full-rated surge; defines worst-case overvoltage seen by protected circuitry. |
| PPK | 1500 W - Peak pulse power handling per 1ms waveform; qualifies for ISO 7637-2 Pulse 5a (load dump) simulation. |
| IR @ VWM | <1 µA - Reverse leakage at 40V; negligible power loss and signal integrity impact in always-on monitoring circuits. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in engine bay or industrial enclosures without derating below 100% rating. |
Pinout & Package
DO-214AB (SMC) surface-mount package: molded epoxy case rated UL 94V-0, matte tin-plated leads, polarity indicated by cathode band (bidirectional operation renders band non-functional but retained for mechanical consistency).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (marked band) | Bidirectional terminal pair | Identical clamping behavior in both directions; no functional polarity-band is mechanical reference only. |
| Case | Thermal path | Exposed metal slug provides low-impedance thermal conduction to PCB copper; requires ≥100 mm² 2-oz copper pad for full 1500W rating. |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect/load dump), and Pulse 3a/3b (EFT coupling); eliminates need for external test validation. |
| Sub-1 ps response time | Clamps transients before propagation into sensitive analog or digital circuitry; critical for protecting CAN/LIN transceivers and microcontroller I/O. |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement prior to reflow; compatible with standard SMT assembly lines without special handling. |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU; supports green manufacturing and export compliance. |
Applications
| Automotive Power Rail Protection | Industrial Lighting Driver |
|---|---|
Use Scenario: Protecting 12V/24V supply inputs in body control modules (BCM), infotainment head units, and ADAS sensors against load dump and jump-start surges. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC-DC converters and LDOs to limit input voltage excursion during ISO 7637-2 Pulse 5a events. Use Value: Limits peak rail voltage to ≤64.5V, preventing damage to 36V-rated input stages and enabling use of cost-optimized 60V MOSFETs and regulators. | Use Scenario: Safeguarding LED driver ICs and MOSFET switches in streetlight and tunnel lighting systems exposed to lightning-induced surges and grid switching transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed across AC input rectifier output or DC bus to absorb 1kV/1.2×50µs common-mode surges. Use Value: Withstands 1500W pulses without degradation, extending system MTBF and eliminating field failures due to ESD/EFT-induced latch-up in PWM controllers. |
| ESD-Protected Communication Interface | Inductive Load Switching Protection |
Use Scenario: Shielding LIN bus transceivers and CAN FD nodes in vehicle subsystems from contact ESD (±15kV) and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ ≈ 100–300 pF typical) placed directly at connector interface to shunt fast transients before reaching PHY layer. Use Value: Sub-1ps response ensures clamping occurs within first 10ns of ESD event, preserving signal integrity on 20 kbps LIN or 5 Mbps CAN FD buses. | Use Scenario: Suppressing flyback voltage spikes generated by relay coils, solenoids, and fuel injectors in engine management and HVAC control units. IC Role / Device Role / Timing Role: Parallel-connected TVS across inductive load to clamp energy dissipation during turn-off, replacing slower diodes in high-speed switching applications. Use Value: 64.5V clamping enables use of 60V-rated logic-level MOSFETs instead of 100V+ devices, reducing RDS(on) and conduction losses by >30%. |
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 (Bourns) | Same DO-214AA (SMB) package; 600W rating (vs. 1500W); lower IPPM (12A) and higher VC (69.4V). | Limited to lower-energy transients (e.g., IEC 61000-4-2 ESD only); unsuitable for ISO 7637-2 Pulse 5a. | Select SMCJ40CA when full 1500W surge immunity is required; SMBJ40CA fits space-constrained layouts but sacrifices robustness. |
| 1.5KE40CA (ON Semiconductor) | Through-hole DO-15 package; identical 1500W rating and 64.5V VC, but larger footprint and manual assembly requirement. | Used in legacy industrial power supplies where automated SMT is unavailable or thermal mass requirements exceed SMC capability. | Choose SMCJ40CA for modern SMT production with equivalent surge performance and smaller board area. |
Compared with SMBJ40CA and 1.5KE40CA, the SMCJ40CA uniquely combines 1500W surge capacity, DO-214AB surface-mount compatibility, and bidirectional clamping in a single component-enabling high-reliability automotive and industrial designs without layout or assembly compromise.
Availability
SMCJ40CA is available at Aetrix Electronics and suitable for automotive electronics, industrial lighting drivers, and communication interface protection requiring stable component supply and long-term lifecycle assurance.
Supply support for SMCJ40CA 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 Taiwanese manufacturer specializing in discrete semiconductors, including TVS diodes, rectifiers, and MOSFETs, with ISO/TS 16949 certification for automotive-grade products.
The SMCJ series is part of TSC's high-power transient suppression portfolio, engineered specifically for ISO 7637-2 compliance in 12V/24V vehicle electrical systems and ruggedized industrial power interfaces.
FAQ
What is the clamping voltage of the SMCJ40CA under maximum rated surge current?
The SMCJ40CA has a maximum clamping voltage (VC) of 64.5 V at 24 A peak pulse current (IPPM), measured using the 10/1000 µs waveform per IEC 61000-4-5. This value ensures protected downstream components remain within their absolute maximum voltage ratings during standardized surge events, and is confirmed across production lots per Taiwan Semiconductor's S2104 datasheet revision.
Is the SMCJ40CA suitable for bidirectional signal line protection such as CAN or LIN buses?
Yes, the SMCJ40CA is explicitly designed for bidirectional operation (denoted by the "CA" suffix) and exhibits symmetrical clamping in both polarities. Its 64.5 V clamping voltage and sub-1 ps response make it appropriate for protecting 12V CAN/LIN physical layers against ESD and EFT, though layout must minimize parasitic inductance to preserve response speed-SMCJ40CA itself imposes no polarity constraint on differential signaling lines.
How does the SMCJ40CA compare to unidirectional SMCJ40A in terms of electrical performance?
The SMCJ40CA and SMCJ40A share identical VWM (40 V), VBR (44.4–49.1 V), and VC (64.5 V) specifications, but differ in polarity: SMCJ40CA operates bidirectionally with symmetrical characteristics, while SMCJ40A is unidirectional and requires correct orientation. Both meet ISO 7637-2, but SMCJ40CA eliminates polarity-checking during automated placement and suits AC-coupled or floating interfaces where voltage reversal may occur.
What is the maximum junction temperature and thermal resistance of the SMCJ40CA?
The SMCJ40CA has a maximum junction temperature (TJ) of +150 °C and thermal resistances of RθJC = 10 °C/W (junction-to-case) and RθJA = 55 °C/W (junction-to-ambient). These values assume standard JEDEC 2-layer PCB mounting with ≥100 mm² 2-oz copper pad; exceeding TJ risks parametric shift or catastrophic failure, so thermal design must respect these limits under worst-case ambient and power dissipation conditions.
Does the SMCJ40CA require special handling or baking before reflow soldering?
No-SMCJ40CA is rated Moisture Sensitivity Level 1 (per J-STD-020), meaning it has unlimited floor life and no pre-reflow baking is required. It is fully compatible with standard lead-free reflow profiles (e.g., JEDEC J-STD-020 Class 3), supporting high-yield automated assembly without process modification or moisture-related defects like popcorning.
SMCJ40CA 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:
- 2
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 23.3A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ40CA FAQ
1.How can I place an order for SMCJ40CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40CA 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 SMCJ40CA reliable?
The price and inventory of SMCJ40CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40CA is usually 5 days.
3.What payment methods are accepted for SMCJ40CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40CA?
SMCJ40CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40CA 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 SMCJ40CA?
For technical support, including SMCJ40CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40CA requirements.
6.How does Aetrix verify that SMCJ40CA is sourced from the original manufacturer or authorized distributors?
All SMCJ40CA 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 SMCJ40CA meets industry standards.
7.What is the process for return or replacement of SMCJ40CA?
All SMCJ40CA units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40CA, 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 SMCJ40CA part is unused and in its original packaging.
Return procedure for SMCJ40CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40CA Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
