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Vishay General Semiconductor - Diodes Division SMCJ40CAHE3_A/I
- Part No.:
- SMCJ40CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40CAHE3_A/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,173
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Product details
Overview
SMCJ40CAHE3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 40 V standoff voltage, 1500 W peak pulse power rating, and 64.5 V maximum clamping voltage at 23.3 A peak pulse current. It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive, industrial, and telecom systems against inductive switching transients and lightning-induced surges.
For engineers reviewing the SMCJ40CAHE3_A/I datasheet, SMCJ40CAHE3_A/I pinout, SMCJ40CAHE3_A/I application, or SMCJ40CAHE3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 1500 W 10/1000 µs surge rating, low thermal resistance (RθJL = 15 °C/W), and RoHS-compliant matte tin-plated leads suitable for automated SMT assembly.
Technical Context
This device operates as a voltage-clamping protector using an avalanche breakdown mechanism, with symmetrical bidirectional behavior ensuring identical electrical characteristics in both polarities. Its glass-passivated junction delivers fast response time (<1 ps) and low incremental surge resistance, enabling effective suppression of transient events up to 1500 W without degradation under repeated stress.
Designed for surface-mount implementation on standard PCB copper pads (8.0 mm × 8.0 mm per terminal), it meets MSL Level 1 per J-STD-020 and supports peak reflow temperatures up to 260 °C. The AEC-Q101 qualification confirms suitability for automotive-grade reliability requirements including temperature cycling, humidity bias, and mechanical shock testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating range for protected circuitry. |
| VBR min/max | 44.4 V / 49.1 V - Breakdown voltage range at 1 mA test current; ensures consistent turn-on threshold across production lots. |
| VC @ IPPM | 64.5 V - Clamping voltage at 23.3 A peak pulse current; determines maximum voltage seen by downstream components during surge. |
| PPPM | 1500 W - Peak pulse power handling with 10/1000 µs waveform; quantifies energy absorption capacity per transient event. |
| RθJL | 15 °C/W - Junction-to-lead thermal resistance; enables efficient heat transfer to PCB copper, critical for sustained surge duty cycles. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and high-ambient industrial environments. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place and reflow processes. |
Pinout & Package
SMCJ40CAHE3_A/I uses the SMC (DO-214AB) package: a two-terminal surface-mount device with no polarity marking for bidirectional operation. Terminals are matte tin-plated leads solderable per J-STD-002 and JESD 22-B102, mounted on 8.0 mm × 8.0 mm copper pads per lead for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (positive polarity) | Accepts surge current during positive half-cycle; forms symmetrical clamping path with cathode. |
| Cathode | Transient current entry point (negative polarity) | Accepts surge current during negative half-cycle; completes bidirectional clamping function with anode. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions eliminates need for polarity-aware layout and enables universal placement on AC or differential signal lines. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, body electronics, and ADAS sensors requiring extended temperature cycling and long-term reliability. |
| Glass passivated junction | Enhances surge endurance and stability over time by preventing moisture ingress and oxidation at the PN junction interface. |
| Low RθJL (15 °C/W) | Enables rapid heat dissipation into PCB copper, maintaining junction temperature below 150 °C even during repetitive 1500 W transients. |
| MSL Level 1 rating | Permits unlimited floor life and exposure to standard reflow profiles up to 260 °C peak, simplifying manufacturing logistics and reducing bake requirements. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients in passenger vehicles and commercial trucks. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across power rail inputs to absorb >100 V spikes while maintaining <65 V rail integrity. Use Value: Prevents latch-up and permanent damage to microcontrollers and CAN transceivers during ISO 7637-2 Pulse 5a events without requiring additional filtering components. | Use Scenario: Shielding analog output signals from pressure, temperature, and position sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Low-capacitance TVS connected between signal line and ground to suppress ESD and fast-rising EFT bursts per IEC 61000-4-2/4-4. Use Value: Maintains signal fidelity below 100 pF capacitance while clamping transients to <65 V, preserving ADC accuracy and avoiding false triggering in 4–20 mA loops. |
| Telecom Power Feeds | Consumer Device USB Ports |
Use Scenario: Safeguarding PoE-powered equipment (e.g., IP cameras, wireless access points) against induced surges on Ethernet cables. IC Role / Device Role / Timing Role: Bidirectional TVS installed on each data pair and power pair to limit common-mode and differential-mode transients simultaneously. Use Value: Withstands multiple 1500 W surges per IEC 61000-4-5 while maintaining isolation integrity and preventing PHY IC failure during lightning-induced coupling. | Use Scenario: Adding secondary-level surge protection to USB 2.0/3.0 host ports in laptops, docking stations, and smart displays. IC Role / Device Role / Timing Role: Fast-response TVS placed between VBUS and GND to clamp hot-plug inrush and external ESD events before reaching USB controller. Use Value: Limits VBUS overshoot to ≤64.5 V during ±15 kV contact ESD, protecting internal PMICs and USB switch ICs without degrading 480 Mbps data integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40CAHE3_A/I | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (100 °C/W) | Suitable for lower-energy transients and space-constrained layouts where 1500 W rating is unnecessary | Select when board area is limited and surge threat level is defined by IEC 61000-4-2 only, not IEC 61000-4-5 |
| SMCJ43CAHE3_A/I | Higher VWM (43 V), VBR (47.8–52.8 V), and VC (69.4 V); same PPPM and package | Better margin for 42 V nominal systems (e.g., dual-battery automotive), but less headroom for 40 V rail clamping | Choose when protecting 42 V architectures where 40 V VWM risks premature conduction during normal operation |
Compared with SMCJ40CAHE3_A/I, SMAJ40CAHE3_A/I offers reduced surge capacity in a smaller footprint, while SMCJ43CAHE3_A/I provides higher standoff voltage for tighter system margins-both require validation of clamping voltage compatibility with protected IC absolute maximum ratings.
Availability
SMCJ40CAHE3_A/I is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, telecom PoE feeds, and consumer USB port protection requiring stable component supply across high-volume production programs.
Supply support for SMCJ40CAHE3_A/I 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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series is engineered for high-power transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness against lightning, load dump, and ESD is non-negotiable.
FAQ
What is the clamping voltage of SMCJ40CAHE3_A/I at its rated peak pulse current?
The SMCJ40CAHE3_A/I has a maximum clamping voltage (VC) of 64.5 V at its rated peak pulse current (IPPM) of 23.3 A, measured under the standardized 10/1000 µs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case surge events and must be verified against the absolute maximum ratings of downstream ICs. The SMCJ40CAHE3_A/I maintains this clamping performance consistently across its operating temperature range of -55 °C to +150 °C.
Is SMCJ40CAHE3_A/I suitable for automotive applications?
Yes, SMCJ40CAHE3_A/I is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix, indicating RoHS compliance and qualification to the AEC-Q101 stress test standard. It is deployed in engine control units, body control modules, and ADAS sensor interfaces where protection against load dump, jump-start transients, and ISO 7637-2 pulses is required. The SMCJ40CAHE3_A/I's 1500 W surge rating and 150 °C maximum junction temperature support under-hood and chassis-mounted deployments.
How does the bidirectional configuration of SMCJ40CAHE3_A/I affect its PCB layout?
The bidirectional configuration of SMCJ40CAHE3_A/I eliminates polarity marking and allows placement across any two nodes requiring symmetrical surge suppression-such as AC power lines, differential data pairs, or ungrounded signal paths-without orientation constraints. Unlike unidirectional TVS diodes, the SMCJ40CAHE3_A/I requires no cathode band alignment during placement, reducing assembly errors and enabling simplified routing in compact layouts. Its DO-214AB footprint remains identical regardless of directionality.
What is the thermal resistance profile of SMCJ40CAHE3_A/I and why does it matter?
SMCJ40CAHE3_A/I has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W and junction-to-ambient (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads. Low RθJL ensures rapid heat transfer from the silicon die into the PCB copper, preventing thermal runaway during repetitive surges. This is critical for applications like industrial motor drives where multiple transients occur in quick succession-the SMCJ40CAHE3_A/I's thermal design sustains performance without derating if proper pad layout is followed.
Can SMCJ40CAHE3_A/I replace a unidirectional TVS in an existing design?
SMCJ40CAHE3_A/I can replace a unidirectional TVS only if the circuit topology supports bidirectional clamping-i.e., the protected node is referenced to ground or floating, not biased with DC polarity that would forward-bias one direction continuously. In power rail applications with known polarity, a unidirectional device may offer lower leakage at VWM; however, the SMCJ40CAHE3_A/I's 1.0 µA max reverse leakage at 40 V is still acceptable for most 12 V/24 V systems. Always verify steady-state power dissipation and clamping asymmetry before substitution.
SMCJ40CAHE3_A/I 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/I FAQ
1.How can I place an order for SMCJ40CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40CAHE3_A/I 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/I reliable?
The price and inventory of SMCJ40CAHE3_A/I 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/I is usually 5 days.
3.What payment methods are accepted for SMCJ40CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40CAHE3_A/I?
SMCJ40CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40CAHE3_A/I 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/I?
For technical support, including SMCJ40CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40CAHE3_A/I requirements.
6.How does Aetrix verify that SMCJ40CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ40CAHE3_A/I 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/I meets industry standards.
7.What is the process for return or replacement of SMCJ40CAHE3_A/I?
All SMCJ40CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40CAHE3_A/I, 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/I part is unused and in its original packaging.
Return procedure for SMCJ40CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40CAHE3_A/I Tags
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