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Vishay General Semiconductor - Diodes Division SMCJ45CAHE3/9AT
- Part No.:
- SMCJ45CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45CAHE3/9AT.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,663
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Product details
Overview
SMCJ45CAHE3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 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 (10/1000 µs waveform), commonly deployed on automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SMCJ45CAHE3/9AT datasheet, SMCJ45CAHE3/9AT pinout, SMCJ45CAHE3/9AT application, or SMCJ45CAHE3/9AT equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 1500 W surge rating, low incremental surge resistance, and compatibility with automated SMT placement on 8 mm × 8 mm copper pads.
Technical Context
The SMCJ45CAHE3/9AT operates as a bidirectional avalanche diode, symmetrically clamping voltage transients in both polarities without polarity marking. Its glass-passivated junction ensures stable breakdown behavior and fast response time (<1 ps), while the SMC package provides low thermal resistance (RθJL = 15 °C/W) and meets UL 94 V-0 flammability rating.
Designed for high-energy transient suppression, it complies with ANSI/IEEE C62.35 and delivers consistent clamping performance across -55 °C to +150 °C operating junction temperature. The device is rated for non-repetitive 10/1000 µs surges up to 1500 W and supports automotive-grade reliability via AEC-Q101 qualification (HE3 suffix).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse working voltage before clamping begins |
| VBR min/max | 50.0 V / 55.3 V - Breakdown voltage range at 1 mA test current; defines reliable conduction onset |
| VC @ IPPM | 72.7 V - Clamped voltage at 20.6 A peak pulse current; determines protected circuit's max stress level |
| PPPM | 1500 W - Peak pulse power handling (10/1000 µs); enables protection against severe lightning or inductive spikes |
| IPPM | 20.6 A - Corresponding peak pulse current at VC; used to size PCB trace and layout for surge path |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments |
| RθJL | 15 °C/W - Junction-to-lead thermal resistance; enables effective heat transfer to PCB copper pads |
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, RoHS-compliant and AEC-Q101 qualified (HE3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | One terminal of symmetrical avalanche junction; connects to protected line or ground reference |
| Cathode | Transient return path (bidirectional) | Second terminal of symmetrical avalanche junction; identical function to Anode; no functional distinction in CA devices |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| AEC-Q101 qualification | Validated for automotive applications including engine control modules and ADAS sensor interfaces |
| 1500 W peak pulse rating | Withstands high-energy transients per ISO 7637-2 Pulse 5a/b and IEC 61000-4-5 Level 4 |
| Glass passivated junction | Ensures long-term stability of breakdown voltage and low leakage (<1 µA at VWM) |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor signal lines (e.g., oxygen, pressure, temperature sensors) from load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS diode placed directly at connector entry point to shunt transients before reaching signal conditioning ICs. Use Value: Limits induced voltage to ≤72.7 V during 1500 W surges, preserving integrity of 3.3 V/5 V sensor interface ICs and meeting ISO 16750-2 requirements. | Use Scenario: Safeguarding digital input/output channels of programmable logic controllers against field-induced surges from solenoid switching or motor drives. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted on PCB edge connectors to clamp fast-rising transients before they propagate into isolation barriers or microcontrollers. Use Value: Maintains <1 µA leakage at 45 V, preventing false triggering of 24 V digital inputs while clamping 20.6 A surges within safe energy limits. |
| Telecom Line Interface | Consumer Power Adapter ESD Protection |
Use Scenario: Shielding RS-485/RS-422 differential data lines in base station equipment from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential pair to suppress common-mode transients without distorting signal integrity. Use Value: Symmetrical 50–55.3 V breakdown ensures balanced clamping, minimizing skew and preserving signal timing margins up to 10 Mbps. | Use Scenario: Adding secondary-level surge immunity to USB-C or barrel jack inputs in smart home hubs and audio adapters exposed to user-handling ESD. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. <100 pF) integrated near power entry to absorb contact discharge without affecting inrush or regulation. Use Value: Delivers 1500 W surge handling in compact SMC package, enabling cost-effective protection without requiring additional board area or discrete components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC45CA | Lower peak power (400 W), smaller SMA package, higher VC (80 V) | Suitable only for lower-energy consumer-grade transients; not AEC-Q101 qualified | Select when space-constrained and surge threat level is limited to IEC 61000-4-2 ±8 kV contact |
| SMCJ45CAHM3/9AT | Halogen-free variant with identical electrical specs and AEC-Q101 qualification | Same automotive and industrial use cases; differs only in material compliance (halogen-free vs. standard RoHS) | Choose for strict halogen-free BOM requirements without compromising performance or qualification |
Compared with SAC45CA and SMCJ45CAHM3/9AT, the SMCJ45CAHE3/9AT offers the highest surge robustness (1500 W) among the three and is uniquely optimized for automotive under-hood deployment via its AEC-Q101 qualification and thermal design-making it the preferred choice where reliability under extreme thermal and electrical stress is mandatory.
Availability
SMCJ45CAHE3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, telecom line interfaces, and consumer power adapter ESD protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMCJ45CAHE3/9AT 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, precision, and application-specific optimization.
The SMCJ series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-power transient suppression in harsh environments-including automotive, industrial, and telecom infrastructure-where consistent clamping and long-term stability are critical.
FAQ
What does the "CA" suffix mean in SMCJ45CAHE3/9AT?
The "CA" suffix in SMCJ45CAHE3/9AT denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression in both polarities. Unlike unidirectional variants (e.g., SMCJ45A), the SMCJ45CAHE3/9AT has no cathode marking and functions identically regardless of voltage polarity-ideal for protecting AC-coupled or floating signal paths. This is confirmed in Vishay's datasheet section "DEVICES FOR BIDIRECTION APPLICATIONS".
Is SMCJ45CAHE3/9AT AEC-Q101 qualified?
Yes, SMCJ45CAHE3/9AT is AEC-Q101 qualified, as indicated by the "HE3" suffix in the part number. Vishay explicitly states that base P/NHE3_X denotes RoHS-compliant and AEC-Q101 qualified versions, and the datasheet confirms this qualification in the Mechanical Data and Ordering Information sections. This makes SMCJ45CAHE3/9AT suitable for automotive applications including engine control, body electronics, and ADAS sensor systems.
What is the clamping voltage of SMCJ45CAHE3/9AT at its rated peak pulse current?
The clamping voltage (VC) of SMCJ45CAHE3/9AT is 72.7 V at its rated peak pulse current (IPPM) of 20.6 A, measured using the standard 10/1000 µs waveform. This value is specified in the Electrical Characteristics table on page 2 of the Vishay datasheet (Document Number: 88394), under the row for SMCJ45A/SMCJ45CA. It defines the maximum voltage imposed on the protected circuit during worst-case surge events.
Can SMCJ45CAHE3/9AT be used in place of a unidirectional TVS like SMCJ45AHE3/9AT?
No-SMCJ45CAHE3/9AT is not a direct replacement for unidirectional SMCJ45AHE3/9AT due to fundamental differences in polarity behavior and circuit integration. While both share identical VWM, VBR, and PPPM, the unidirectional version requires correct cathode orientation and conducts forward current, whereas the bidirectional SMCJ45CAHE3/9AT has no polarity marking and blocks in both directions until breakdown. Substitution requires verifying system-level polarity, grounding scheme, and failure mode impact before implementation.
What is the thermal resistance from junction to lead (RθJL) for SMCJ45CAHE3/9AT?
The thermal resistance from junction to lead (RθJL) for SMCJ45CAHE3/9AT is 15 °C/W, as published in the Thermal Characteristics table on page 3 of the Vishay datasheet. This parameter reflects the device's ability to conduct heat from the silicon junction to the soldered leads under typical mounting conditions, supporting reliable operation at up to +150 °C junction temperature when mounted on recommended 8.0 mm × 8.0 mm copper pads.
SMCJ45CAHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ45CAHE3/9AT FAQ
1.How can I place an order for SMCJ45CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45CAHE3/9AT 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 SMCJ45CAHE3/9AT reliable?
The price and inventory of SMCJ45CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ45CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ45CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45CAHE3/9AT?
SMCJ45CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45CAHE3/9AT 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 SMCJ45CAHE3/9AT?
For technical support, including SMCJ45CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45CAHE3/9AT requirements.
6.How does Aetrix verify that SMCJ45CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ45CAHE3/9AT 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 SMCJ45CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ45CAHE3/9AT?
All SMCJ45CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45CAHE3/9AT, 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 SMCJ45CAHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ45CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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