My Inquiry
My Account
Taiwan Semiconductor Corporation SMCJ40CH
- Part No.:
- SMCJ40CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40CH.pdf
- Description:
- 1500W, 49.4V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:7,589
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ40CH 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 71.4V maximum clamping voltage (VC) at 22A peak pulse current. It provides ESD and surge protection for automotive power lines and industrial I/O interfaces.
For engineers reviewing the SMCJ40CH datasheet, SMCJ40CH pinout, SMCJ40CH application, or SMCJ40CH equivalent, this device supports AEC-Q101 qualification, meets ISO 7637-2 Pulse 1/2a/2b/3a/3b, delivers sub-1ps response time, and maintains <1μA reverse leakage above 10V - critical for low-power, high-reliability DC bus protection.
Technical Context
The SMCJ40CH is a unidirectional/bidirectional TVS diode configured as a single die in a glass-passivated junction structure. Its bidirectional operation (denoted by 'CH' suffix) enables symmetrical clamping in AC-coupled or floating signal paths, with identical electrical characteristics in both directions per manufacturer specification.
It features fast transient response (<1.0ps rise to VBR), low thermal resistance (RθJC = 10°C/W), and robust surge handling per 10/1000μs waveform (IPPM = 22A). The device operates across –55°C to +150°C junction temperature and complies with J-STD-020 moisture sensitivity level 1.
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 @ IT = 1 mA - Confirmed breakdown threshold range for reliable turn-on margin |
| VC @ IPPM | 71.4 V @ 22 A - Clamped voltage during 10/1000μs surge, limiting downstream stress |
| PPK | 1500 W - Peak pulse power rating defining single-event surge energy absorption capability |
| IR @ VWM | <1 μA - Ultra-low leakage ensuring minimal standby power loss in battery-backed systems |
| TJ max | +150 °C - Enables use in under-hood automotive environments without derating |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 7.11 mm x 6.22 mm footprint and 2.3 mm height |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (not applicable for bidirectional SMCJ40CH - no polarity marking required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Transient current entry point (bidirectional) | Accepts surge current in either direction; symmetric conduction path |
| Cathode (Lead 2) | Transient current exit point (bidirectional) | Completes clamping loop regardless of voltage polarity; no functional distinction from Anode |
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 defined vehicle electrical transients (Pulse 1, 2a, 2b, 3a, 3b) without degradation |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal/humidity stress |
| Sub-1ps response time | Clamps ESD events before sensitive ICs experience overvoltage damage |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive for environmentally constrained applications |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and body control module power inputs against load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between VBAT and GND, absorbing transients up to 1500W. Use Value: Prevents latch-up or permanent failure in 12V automotive electronics while maintaining <1μA quiescent leakage. | Use Scenario: Shielding 4–20mA current-loop sensors in factory automation from induced lightning surges on field wiring. IC Role / Device Role / Timing Role: Primary surge suppression device across sensor supply terminals, operating symmetrically for AC-coupled noise rejection. Use Value: Limits clamping voltage to 71.4V during 22A surges, keeping protected circuitry within safe operating area. |
| Telecom DC Power Input Protection | Consumer USB-C Port ESD Hardening |
Use Scenario: Safeguarding PoE-powered switches and base station RF modules from induced transients on 48V DC input rails. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of DC-DC converters to clamp ISO 7637-2-compliant pulses. Use Value: Delivers 1500W peak power dissipation with 10°C/W junction-to-case thermal resistance for sustained surge resilience. | Use Scenario: Adding secondary-level ESD immunity to USB-C CC and VBUS lines in portable docking stations. IC Role / Device Role / Timing Role: Fast-response bidirectional suppressor bridging VBUS and GND to shunt ±15kV contact ESD per IEC 61000-4-2. Use Value: Sub-1ps response ensures clamping occurs before internal USB controller damage thresholds are exceeded. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ40CA | Same DO-214AC (SMA) package; lower PPK (400W); VBR = 44.4–49.1V; VC = 64.5V @ 6.2A | Lower surge capacity limits use to non-automotive, low-energy signal lines | Select when space-constrained layouts require smaller SMA footprint and 400W rating suffices |
| ON Semiconductor 1.5KE40CA | Through-hole DO-15 package; PPK = 1500W; VBR = 42.2–46.7V; VC = 64.5V @ 23.3A | Not surface-mountable; incompatible with automated SMT assembly | Choose only for legacy through-hole designs where rework to SMC is not feasible |
Compared with SMAJ40CA and 1.5KE40CA, the SMCJ40CH offers AEC-Q101 qualification, ISO 7637-2 compliance, and DO-214AB packaging optimized for high-volume automotive SMT production - making it the preferred choice for new automotive and industrial designs requiring full transient immunity certification.
Availability
SMCJ40CH is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface hardening, and telecom DC input surge suppression requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMCJ40CH 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 devices since 1979.
The SMCJ series was designed specifically for high-energy transient suppression in automotive and industrial environments, emphasizing AEC-Q101 reliability, ISO 7637-2 compliance, and robust surface-mount packaging for automated manufacturing.
FAQ
What does the 'CH' suffix indicate in SMCJ40CH?
The 'CH' suffix in SMCJ40CH denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage clamping in both polarities. Unlike unidirectional variants (e.g., SMCJ40H), the SMCJ40CH has no anode/cathode distinction and functions identically whether positive or negative surge voltage is applied - essential for protecting AC-coupled or floating circuits. This is confirmed in the manufacturer's datasheet section "Devices for bipolar applications".
Is SMCJ40CH AEC-Q101 qualified?
Yes, SMCJ40CH is explicitly AEC-Q101 qualified per the provided datasheet (Version A2102, Page 1). This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD, validating its suitability for automotive electronic control units, body modules, and infotainment systems where reliability under harsh conditions is mandatory.
What is the maximum clamping voltage of SMCJ40CH and at what current?
The maximum clamping voltage (VC) of SMCJ40CH is 71.4 V at a peak pulse current (IPPM) of 22 A, measured using the standard 10/1000 μs double-exponential waveform per Fig.5 in the datasheet. This value defines the upper voltage limit imposed on protected circuitry during worst-case surge events and is critical for ensuring downstream components remain within their absolute maximum ratings.
Does SMCJ40CH meet ISO 7637-2 requirements?
Yes, SMCJ40CH meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements as stated in the FEATURES section of the datasheet. This certification confirms its ability to suppress transients generated by load switching, ignition interference, and battery disconnection in 12V automotive systems - a key requirement for ECUs, ADAS sensors, and telematics modules.
What is the thermal resistance of SMCJ40CH and why does it matter?
The junction-to-case thermal resistance (RθJC) of SMCJ40CH is 10°C/W, and junction-to-ambient (RθJA) is 55°C/W. These values determine how effectively heat from surge energy dissipation is transferred away from the silicon die. Low RθJC enables efficient heat transfer to the PCB copper pour or heatsink, preventing thermal runaway during repetitive surges - especially important in engine bay or industrial control cabinet deployments.
SMCJ40CH 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:
- 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)
SMCJ40CH FAQ
1.How can I place an order for SMCJ40CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40CH 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 SMCJ40CH reliable?
The price and inventory of SMCJ40CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40CH is usually 5 days.
3.What payment methods are accepted for SMCJ40CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40CH?
SMCJ40CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40CH 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 SMCJ40CH?
For technical support, including SMCJ40CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40CH requirements.
6.How does Aetrix verify that SMCJ40CH is sourced from the original manufacturer or authorized distributors?
All SMCJ40CH 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 SMCJ40CH meets industry standards.
7.What is the process for return or replacement of SMCJ40CH?
All SMCJ40CH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40CH, 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 SMCJ40CH part is unused and in its original packaging.
Return procedure for SMCJ40CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40CH 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…
