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Vishay General Semiconductor - Diodes Division SMCJ40CAHE3_A/H
- Part No.:
- SMCJ40CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40CAHE3_A/H.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,268
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Product details
Overview
SMCJ40CAHE3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients up to 1500 W peak pulse power with 64.5 V maximum clamping voltage at 23.3 A peak pulse current and 40 V stand-off voltage. It features AEC-Q101 qualification, glass passivated junction, and MSL Level 1 moisture sensitivity for automotive-grade reliability in power rail and signal line protection.
For engineers reviewing the SMCJ40CAHE3_A/H datasheet, SMCJ40CAHE3_A/H pinout, SMCJ40CAHE3_A/H application, or SMCJ40CAHE3_A/H equivalent, this device is selected for robust overvoltage protection in automotive ECUs, industrial sensor interfaces, and DC power inputs where fast response (<1 ns), low clamping ratio (VC/VWM = 1.61), and bidirectional surge immunity per IEC 61000-4-5 are required.
Technical Context
The SMCJ40CAHE3_A/H operates as a bidirectional avalanche diode, symmetrically clamping both positive and negative transients above its breakdown voltage range of 44.4–49.1 V at 1 mA test current. Its low incremental surge resistance enables stable clamping under high-energy 10/1000 µs surges, while the 75 °C/W junction-to-ambient thermal resistance supports operation up to +150 °C junction temperature without forced cooling.
Designed for unmarked bidirectional polarity, it delivers 1.0 µA max reverse leakage at 40 V stand-off and exhibits a +0.101 %/°C temperature coefficient of breakdown voltage - enabling predictable voltage drift across automotive temperature ranges. The device meets JESD201 Class 2 whisker resistance and UL 94 V-0 flammability requirements for safety-critical PCB mounting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 40 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 44.4–49.1 V at 1 mA - Confirmed avalanche initiation range; ensures reliable turn-on during transient events without premature conduction. |
| VC (Clamping Voltage) | 64.5 V at 23.3 A IPPM - Peak voltage seen by protected circuit during 1500 W surge; determines downstream component voltage stress. |
| PPPM (Peak Pulse Power) | 1500 W - Energy-handling capability for 10/1000 µs waveform; validates suitability for IEC 61000-4-5 Level 4 (4 kV) surge testing. |
| ID (Reverse Leakage) | 1.0 µA max at VWM - Low leakage preserves system efficiency and prevents false triggering in high-impedance circuits. |
| TJ max | +150 °C - Maximum junction temperature rating; supports under-hood automotive deployment without derating at 85 °C ambient. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronic control units per stress test requirements including HTOL, TC, and ESD. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode / Anode (symmetrical) | Bidirectional avalanche junction terminals | No functional distinction - either terminal serves as cathode or anode depending on transient polarity; no band marking required. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including engine control, body modules, and ADAS sensors - eliminates need for additional qualification effort. |
| 1500 W peak pulse power | Withstands 4 kV IEC 61000-4-5 surge (10/1000 µs) on 40 V DC rails - protects downstream MOSFETs, MCUs, and CAN transceivers without external series impedance. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage stress on protected ICs - e.g., keeps 3.3 V or 5 V logic inputs within absolute maximum ratings during surge events. |
| MSL Level 1 (260 °C peak reflow) | Enables standard lead-free SMT assembly without pre-baking - reduces manufacturing complexity and cost in high-volume automotive production. |
| Glass passivated chip junction | Improves long-term reliability and humidity resistance - critical for under-hood applications exposed to thermal cycling and condensation. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Protecting microcontroller GPIOs and LIN bus transceivers from load dump and alternator ripple in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt transients before reaching sensitive analog front-ends. Use Value: Maintains 40 V stand-off while clamping to 64.5 V - ensuring MCU I/O stays below 70 V absolute max rating during 120 V load dump events. |
Use Scenario: Safeguarding 4–20 mA current loop receivers and ADC reference inputs against ESD and switching noise in factory automation PLCs. IC Role / Device Role / Timing Role: Fast-response TVS placed across input terminals to suppress sub-100 ns ESD pulses and inductive kickback from solenoid drivers. Use Value: 1.0 µA leakage at 40 V prevents measurement offset in precision current sensing; 64.5 V clamping avoids saturation of 24 V rail LDOs. |
| DC Power Input Protection (24 V) | Automotive Infotainment USB Interface |
|
Use Scenario: Secondary overvoltage protection on 24 V auxiliary power rails feeding ADAS camera modules and radar processors. IC Role / Device Role / Timing Role: Standoff-clamp TVS used in parallel with primary DC-DC converter input to absorb residual surges escaping upstream filtering. Use Value: 1500 W rating handles sustained 200 ms load dump transients; AEC-Q101 compliance guarantees lifetime reliability in vibration-prone environments. |
Use Scenario: Bidirectional ESD protection on USB 2.0 D+/D− lines connected to infotainment head units exposed to human-body-model (HBM) discharges. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. <50 pF) integrated into USB connector footprint to clamp ±8 kV contact discharge without signal integrity loss. Use Value: Symmetric clamping ensures equal protection for both data lines; 64.5 V VC limits voltage excursion during fast-rising ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40CAHE3_A/H | Lower PPPM (600 W), same VWM (40 V), SMB (DO-214AA) package - 30% smaller footprint but reduced surge energy handling. | Suitable for space-constrained consumer electronics; insufficient for automotive load dump per ISO 7637-2 Pulse 5a. | Select when board area is critical and surge threat level is limited to IEC 61000-4-2 ESD only. |
| SMCJ43CAHE3_A/H | Higher VWM (43 V), VBR 47.8–52.8 V, identical SMC package and 1500 W rating - tighter clamping margin for 48 V systems. | Optimized for 48 V mild-hybrid architectures; provides 3 V higher standoff than SMCJ40CAHE3_A/H without increasing VC significantly. | Choose for next-generation 48 V vehicle platforms requiring extended voltage margin and same mechanical fit. |
Compared with SMBJ40CAHE3_A/H and SMCJ43CAHE3_A/H, the SMCJ40CAHE3_A/H uniquely balances 40 V system compatibility, full automotive surge immunity, and SMC-level robustness - making it the default choice for legacy 12/24 V ECU designs requiring proven AEC-Q101 performance.
Availability
SMCJ40CAHE3_A/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface protection, and 24 V DC power input hardening requiring stable component supply across multi-year production cycles.
Supply support for SMCJ40CAHE3_A/H 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform engineered specifically for high-energy transient suppression in harsh-environment applications - emphasizing AEC-Q101 qualification, repeatable clamping, and SMT manufacturability.
FAQ
What is the clamping voltage of the SMCJ40CAHE3_A/H at its rated peak pulse current?
The SMCJ40CAHE3_A/H has a maximum clamping voltage (VC) of 64.5 V at its rated peak pulse current (IPPM) of 23.3 A, measured under the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during a full-rated surge event and is confirmed in the Vishay datasheet Document Number 88394, page 2. The SMCJ40CAHE3_A/H maintains this clamping performance across its qualified temperature range from –55 °C to +150 °C.
Is the SMCJ40CAHE3_A/H suitable for automotive applications?
Yes, the SMCJ40CAHE3_A/H is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix indicating RoHS-compliant and AEC-Q101 qualified construction. It meets requirements for engine control units, body electronics, and infotainment systems, including thermal cycling, humidity resistance, and surge immunity per ISO 7637-2. The SMCJ40CAHE3_A/H is referenced in Vishay's ordering table with automotive-grade packaging codes (e.g., A/H tape-and-reel) and MSL Level 1 reflow compatibility.
How does the bidirectional configuration of the SMCJ40CAHE3_A/H affect its PCB layout?
The SMCJ40CAHE3_A/H is a bidirectional TVS with no polarity marking - both terminals are functionally identical, eliminating orientation constraints during placement. This simplifies PCB layout by removing the need for silkscreen polarity indicators or automated optical inspection (AOI) checks for cathode alignment. The SMCJ40CAHE3_A/H uses the SMC (DO-214AB) package with symmetric pad layout per Vishay's recommended mounting footprint (0.31" × 0.31" copper pads), enabling direct integration into differential or AC-coupled signal paths without redesign.
What is the maximum reverse leakage current for the SMCJ40CAHE3_A/H at its stand-off voltage?
The SMCJ40CAHE3_A/H specifies a maximum reverse leakage current (ID) of 1.0 µA at its 40 V stand-off voltage (VWM), tested at TA = 25 °C. This low leakage ensures minimal power loss and signal interference in high-impedance circuits such as sensor bias networks or precision reference inputs. The value is verified in the Electrical Characteristics table of the Vishay datasheet (Document Number 88394, page 2) and remains stable across the full operating temperature range due to the device's glass passivated junction.
Does the SMCJ40CAHE3_A/H require heatsinking in typical applications?
No, the SMCJ40CAHE3_A/H does not require external heatsinking for transient suppression duty cycles, as its 1500 W peak pulse power rating is defined for short-duration surges (≤50 ms pulse width) and relies on thermal mass rather than steady-state dissipation. Its RθJA of 75 °C/W applies to continuous power (PD = 6.5 W), which is irrelevant for TVS operation. In practice, the SMCJ40CAHE3_A/H operates safely with standard 0.31" × 0.31" copper pads per terminal - matching Vishay's test condition and eliminating need for thermal vias or copper pours in most automotive and industrial layouts.
SMCJ40CAHE3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- 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):
- 23.3A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ40CAHE3_A/H FAQ
1.How can I place an order for SMCJ40CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40CAHE3_A/H 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 SMCJ40CAHE3_A/H reliable?
The price and inventory of SMCJ40CAHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ40CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40CAHE3_A/H?
SMCJ40CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40CAHE3_A/H 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 SMCJ40CAHE3_A/H?
For technical support, including SMCJ40CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40CAHE3_A/H requirements.
6.How does Aetrix verify that SMCJ40CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ40CAHE3_A/H 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 SMCJ40CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ40CAHE3_A/H?
All SMCJ40CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40CAHE3_A/H, 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 SMCJ40CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMCJ40CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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