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Vishay General Semiconductor - Diodes Division SMCJ45CA-E3/9AT
- Part No.:
- SMCJ45CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45CA-E3/9AT.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,134
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Product details
Overview
SMCJ45CA-E3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 45 V standoff voltage (VWM), 72.7 V maximum clamping voltage (VC) at 20.6 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM). It protects signal lines and power rails in automotive sensor interfaces and industrial control I/O.
For engineers reviewing the SMCJ45CA-E3/9AT datasheet, SMCJ45CA-E3/9AT pinout, SMCJ45CA-E3/9AT application, or SMCJ45CA-E3/9AT equivalent, key selection criteria include bidirectional clamping symmetry, 1500 W surge rating under 10/1000 µs waveform, -55 °C to +150 °C operating junction temperature, RoHS-compliant matte tin plating, and AEC-Q101 qualification eligibility via HE3/HM3 variants.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse (or forward, in bidirectional mode) voltage exceeds the breakdown threshold (VBR = 50.0–55.3 V), it avalanches to limit transient energy. Its low incremental surge resistance ensures stable clamping during fast transients (response time < 1 ns), and its glass-passivated junction enhances reliability under repetitive surge stress.
The device is rated for 1500 W peak pulse power per 10/1000 µs waveform, derated linearly above 25 °C ambient using RθJA = 75 °C/W. Mounting on 8.0 mm × 8.0 mm copper pads is required to achieve full power rating; thermal performance is validated per JEDEC JESD22-A104.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR min/max | 50.0 V / 55.3 V - Breakdown voltage range at 1 mA test current; guarantees consistent turn-on across production lots. |
| VC @ IPPM | 72.7 V - Clamped voltage at 20.6 A peak pulse current; determines maximum voltage seen by protected circuitry. |
| PPPM | 1500 W - Peak pulse power handling capability under standardized 10/1000 µs surge; enables robust lightning/ESD immunity. |
| IPPM | 20.6 A - Corresponding peak pulse current at VC; used to size PCB trace width and verify system-level surge compliance. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and high-ambient industrial environments. |
| Package | SMC (DO-214AB) - Surface-mount package with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place. |
Pinout & Package
SMCJ45CA-E3/9AT 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 JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink (bidirectional) | Conducts surge current in either direction; connects to line being protected (e.g., CAN_H or RS-485 A). |
| Cathode | Transient current sink (bidirectional) | Identical role to Anode; symmetric terminal-no functional distinction in CA devices; both terminals clamp equally. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Equal VBR, VC, and IPPM in both polarities-enables protection of AC-coupled or differential signal lines without polarity concerns. |
| 1500 W surge rating | Withstands IEC 61000-4-5 Level 4 (4 kV surge) on 2 Ω source impedance when properly mounted-meets automotive and industrial surge immunity standards. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage stress on downstream ICs-critical for protecting 3.3 V or 5 V logic interfaces connected to long cables. |
| AEC-Q101 qualification path | HE3/HM3 suffix variants are AEC-Q101 qualified-supports direct use in automotive ECUs, ADAS sensors, and body electronics without requalification. |
| MSL Level 1 moisture sensitivity | Can be reflowed at peak 260 °C without baking-eliminates pre-bake step in high-volume SMT assembly. |
Applications
| Automotive Sensor Interface | Industrial RS-485 Bus |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver pins and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle subsystems. IC Role / Device Role / Timing Role: Shunt-type transient voltage suppressor placed directly at connector entry point to divert surge energy to ground before reaching ASIC or MCU. Use Value: Limits clamped voltage to ≤72.7 V during 1500 W surges-prevents latch-up or gate oxide damage in 5 V tolerant transceivers and ADC front-ends. | Use Scenario: Safeguarding RS-485 transceivers (e.g., THVD1550) on factory floor communication networks exposed to motor drive noise and ESD events. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential pair (A/B) and to ground-suppresses common-mode and differential-mode transients simultaneously. Use Value: Symmetric clamping ensures equal protection on both lines-maintains signal integrity and prevents false triggering during ±15 kV contact ESD per IEC 61000-4-2. |
| Consumer USB-C Port Protection | Power Supply Input Stage |
Use Scenario: Guarding USB-C CC and VBUS lines against hot-plug transients and cable-induced surges in portable docking stations and monitors. IC Role / Device Role / Timing Role: Standoff-rated TVS (45 V) placed upstream of USB-C controller and load switch-blocks >45 V faults while passing normal 5–20 V PD negotiation. Use Value: 72.7 V clamping ensures downstream 20 V-rated controllers remain within absolute maximum ratings-even during worst-case 10/1000 µs surges. | Use Scenario: Secondary-side DC input protection for 48 V industrial power supplies subjected to back-EMF from solenoids and relay coils. IC Role / Device Role / Timing Role: Parallel-connected TVS on DC bus rail-clamps voltage spikes before they propagate into DC-DC converters and microcontrollers. Use Value: 1500 W rating handles repetitive 100 A inductive kickback events-extends system uptime by preventing repeated overvoltage shutdowns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45CA-E3/61T | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VC specs. | Not suitable for IEC 61000-4-5 Level 4; limited to lower-energy ESD and local board-level transients. | Select when space-constrained and surge threat level is ≤400 W-e.g., consumer IoT sensor nodes. |
| SMCJ45A-E3/9AT | Unidirectional version; identical VWM, VBR, VC, but asymmetric conduction-cathode marked, anode grounded. | Requires correct polarity placement; unsuitable for AC or differential signals without series blocking diodes. | Choose only for DC-rail protection where polarity is fixed and ground-referenced-e.g., 48 V supply input with cathode to ground. |
Compared with SMAJ45CA-E3/61T and SMCJ45A-E3/9AT, the SMCJ45CA-E3/9AT uniquely delivers 1500 W bidirectional clamping in SMC package-making it the only option among the three that satisfies automotive-grade surge immunity and differential-signal compatibility without redesign.
Availability
SMCJ45CA-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial RS-485 networks, consumer USB-C port protection, and 48 V power supply input stages requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ45CA-E3/9AT 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, power efficiency, and automotive qualification.
The SMCJ series is engineered for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom systems where robustness against lightning, ESD, and inductive switching is mandatory.
FAQ
What is the clamping voltage of SMCJ45CA-E3/9AT at its rated peak pulse current?
The SMCJ45CA-E3/9AT has a maximum clamping voltage (VC) of 72.7 V at its rated peak pulse current (IPPM) of 20.6 A, measured under the standard 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuits during surge events. The SMCJ45CA-E3/9AT achieves this with a clamping ratio of 1.62 (VC/VWM), confirming effective transient suppression for 45 V nominal systems.
Is SMCJ45CA-E3/9AT suitable for automotive applications?
Yes, the SMCJ45CA-E3/9AT is suitable for automotive applications as a surge protection component. While the base-E3 variant is commercial grade, it shares identical electrical and thermal specifications with AEC-Q101-qualified versions (e.g., SMCJ45CAHE3_A/I). Its -55 °C to +150 °C operating junction temperature range, 1500 W surge rating, and SMC package's MSL Level 1 reflow compatibility meet core requirements for body electronics and sensor modules. For certified deployment, specify the HE3 or HM3 suffix variant of SMCJ45CA-E3/9AT.
How does the bidirectional design of SMCJ45CA-E3/9AT affect its PCB layout?
The bidirectional design of SMCJ45CA-E3/9AT eliminates polarity constraints in PCB layout-no cathode band marking is present, and both terminals function identically. This allows placement across differential signal pairs (e.g., RS-485 A/B) or AC-coupled lines without orientation verification. Layout must still follow Vishay's recommended 8.0 mm × 8.0 mm copper pad per terminal to sustain full 1500 W rating, and thermal relief traces should avoid compromising heat dissipation. The SMCJ45CA-E3/9AT requires no additional biasing or external components for bidirectional operation.
What is the standoff voltage rating of SMCJ45CA-E3/9AT, and how does it relate to system voltage?
The standoff voltage (VWM) of SMCJ45CA-E3/9AT is 45 V-this is the maximum continuous DC or RMS voltage the device blocks without entering avalanche conduction. It must exceed the system's normal operating voltage (e.g., 36 V nominal 48 V bus, 24 V industrial rail) by ≥10 % to prevent leakage or thermal runaway. For a 45 V VWM, the SMCJ45CA-E3/9AT is ideal for 36–42 V systems; selecting it for a 48 V system would risk premature conduction. Always validate VWM margin against worst-case system overvoltage and temperature drift.
Does SMCJ45CA-E3/9AT require a heatsink for 1500 W surge handling?
No, the SMCJ45CA-E3/9AT does not require an external heatsink for single-event 1500 W surge handling because its energy absorption is transient (microsecond duration), not continuous. Thermal design focuses on PCB copper area: Vishay specifies mounting on minimum 8.0 mm × 8.0 mm copper pads per terminal to achieve rated PPPM. The device's RθJA = 75 °C/W applies to steady-state power dissipation (PD = 6.5 W), not surge events. For repetitive surges (>1 Hz), thermal mass and board layout become critical-verify junction temperature rise using transient thermal impedance curves from the SMCJ45CA-E3/9AT datasheet.
SMCJ45CA-E3/9AT 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 20.6A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ45CA-E3/9AT FAQ
1.How can I place an order for SMCJ45CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45CA-E3/9AT 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 SMCJ45CA-E3/9AT reliable?
The price and inventory of SMCJ45CA-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ45CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ45CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45CA-E3/9AT?
SMCJ45CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45CA-E3/9AT 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 SMCJ45CA-E3/9AT?
For technical support, including SMCJ45CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45CA-E3/9AT requirements.
6.How does Aetrix verify that SMCJ45CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ45CA-E3/9AT 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 SMCJ45CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ45CA-E3/9AT?
All SMCJ45CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45CA-E3/9AT, 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 SMCJ45CA-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ45CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ45CA-E3/9AT Tags
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