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Vishay General Semiconductor - Diodes Division SMCJ45CAHE3/57T
- Part No.:
- SMCJ45CAHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45CAHE3/57T.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,653
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Product details
Overview
SMCJ45CAHE3/57T from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection on power and signal lines. It features a 45 V standoff voltage (VWM), 72.7 V maximum clamping voltage at 20.6 A peak pulse current (IPPM), and 1500 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive ECUs, industrial I/O modules, and telecom interface protection.
For engineers reviewing the SMCJ45CAHE3/57T datasheet, SMCJ45CAHE3/57T pinout, SMCJ45CAHE3/57T application, or SMCJ45CAHE3/57T equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, RoHS-compliant HE3 suffix, and compatibility with 8.0 mm × 8.0 mm copper pad thermal layout per JEDEC standards.
Technical Context
The SMCJ45CAHE3/57T operates as a silicon avalanche diode with glass-passivated junction, delivering symmetrical clamping in both polarities due to its bidirectional construction. Its breakdown voltage (VBR) ranges from 50.0 V to 55.3 V at 1 mA test current, with temperature coefficient of +0.102 %/°C ensuring stable overvoltage response across -55 °C to +150 °C operating range.
It meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and is qualified to AEC-Q101 for automotive underhood applications - distinguishing it from commercial-grade E3/M3 variants by enhanced reliability testing and traceability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe operating margin for 48 V nominal systems. |
| VBR min/max | 50.0 V / 55.3 V at 1 mA - Confirmed bidirectional avalanche threshold; ensures consistent turn-on across polarity and unit-to-unit variation. |
| VC @ IPPM | 72.7 V at 20.6 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to <73 V under worst-case 1500 W transient. |
| PPPM | 1500 W - Peak pulse power handling capability; supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge immunity when properly mounted. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in engine bay or industrial enclosures without derating below full power. |
| RθJA | 75 °C/W - Thermal resistance junction-to-ambient on standard 8.0 mm × 8.0 mm pads; informs heatsinking requirements for sustained surge duty cycles. |
| AEC-Q101 | Qualified - Validated for automotive use including temperature cycling, HTRB, and ESD; required for ECU, ADAS, and body control modules. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with molded UL 94 V-0 compound and cathode/anode terminals formed as coplanar gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; common node for bidirectional conduction path | Connected to protected line (e.g., CAN_H or RS-485 A); no polarity marking on device body. |
| Cathode | Current exit terminal in forward bias; symmetric counterpart to anode in bidirectional mode | Connected to protected line (e.g., CAN_L or RS-485 B); identical electrical role to anode; no band marking. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC performance in both directions - eliminates need for orientation-aware placement on differential buses like CAN or RS-485. |
| AEC-Q101 qualification | Validated for automotive underhood environments - includes HTOL, TC, and ESD testing beyond commercial-grade SMCJ45CAHE3/57T's base specification. |
| 1500 W surge rating | Withstands IEC 61000-4-5 combination wave surges up to 4 kV open-circuit / 2 Ω source impedance when mounted per recommended pad layout. |
| Low incremental surge resistance | Enables rapid voltage clamping with minimal overshoot - critical for protecting fast-switching MOSFET gates and microcontroller I/O pins. |
| MSL Level 1 reflow compatibility | Supports lead-free reflow up to 260 °C peak without delamination or parameter shift - suitable for high-volume automated SMT assembly. |
Applications
| Automotive CAN Bus Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting CAN_H/CAN_L lines in engine control units against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS clamp absorbing ±100 V transients while maintaining signal integrity below 1 Mbps data rate. Use Value: Prevents latch-up or gate oxide damage in CAN transceivers (e.g., TJA1042) during battery disconnect events. |
Use Scenario: Shielding RS-485 transceivers in PLC backplanes from EFT bursts and lightning-induced surges on field wiring. IC Role / Device Role / Timing Role: Fast-response shunt device limiting line-to-line voltage to ≤73 V during 10/1000 µs surges. Use Value: Enables >10 kV ESD and >4 kV surge immunity per IEC 61000-4-4/5 without external spark gaps or varistors. |
| Telecom Power Input Stage | Consumer USB-C Port Protection |
Use Scenario: Safeguarding 48 V DC input rails in PoE-powered switches and base stations from induced lightning surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converters and hot-swap controllers. Use Value: Limits input rail excursion to 72.7 V, preventing overvoltage shutdown or MOSFET avalanche failure in primary-side FETs. |
Use Scenario: Protecting USB-C CC and VBUS lines in portable chargers and docks against accidental 20 V adapter misconnection. IC Role / Device Role / Timing Role: Bidirectional clamp on differential CC lines and unidirectional variant on VBUS (not this part). Use Value: Blocks >100 V transients on CC lines while preserving USB PD negotiation timing and voltage detection accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45CAHE3/A | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM and AEC-Q101 qualification | Limited to lower-energy surges (IEC 61000-4-5 Level 2); unsuitable for 48 V bus protection requiring 1500 W headroom | Select when board space is constrained and surge threat level is defined as <1 kV/42 Ω. |
| SMCJ45AHE3/57T | Unidirectional version; identical VWM, VBR, and PPPM but asymmetric clamping (forward VF = 3.5 V @ 100 A) | Requires correct polarity orientation; used where only negative-going transients dominate (e.g., relay coil flyback) | Choose only for single-polarity protection paths; not interchangeable with SMCJ45CAHE3/57T without layout revision. |
Compared with SMAJ45CAHE3/A and SMCJ45AHE3/57T, the SMCJ45CAHE3/57T uniquely delivers bidirectional 1500 W surge handling in AEC-Q101-qualified SMC packaging - making it the sole option for high-reliability, polarity-agnostic 48 V system protection without compromising power rating or thermal robustness.
Availability
SMCJ45CAHE3/57T is available at Aetrix Electronics and suitable for automotive ECUs, industrial I/O modules, and telecom power supply designs requiring stable component supply, AEC-Q101 traceability, and long-term lifecycle support.
Supply support for SMCJ45CAHE3/57T 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 automotive-grade qualification.
The SMCJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where robustness against ESD, EFT, and lightning surges is non-negotiable.
FAQ
What does the "CA" suffix indicate in SMCJ45CAHE3/57T?
The "CA" suffix denotes a bidirectional configuration: the SMCJ45CAHE3/57T provides symmetrical clamping in both polarities, unlike unidirectional "A" variants. This allows placement across differential lines (e.g., CAN_H/CAN_L) without polarity concern, and ensures identical VBR (50.0–55.3 V) and VC (72.7 V) performance regardless of surge direction - confirmed in Vishay Document 88394, Table on page 2.
Is SMCJ45CAHE3/57T suitable for IEC 61000-4-5 Level 4 compliance?
Yes - the SMCJ45CAHE3/57T's 1500 W peak pulse power rating, 72.7 V clamping voltage at 20.6 A, and validated performance on 8.0 mm × 8.0 mm copper pads enable compliance with IEC 61000-4-5 Level 4 (4 kV open-circuit, 2 Ω source impedance) when integrated per Vishay's recommended layout. Its bidirectional nature further supports differential-mode surge suppression required in that standard.
How does the HE3 suffix differ from E3 or M3 in SMCJ45CAHE3/57T?
The HE3 suffix in SMCJ45CAHE3/57T indicates RoHS-compliant construction with full AEC-Q101 qualification - exceeding standard E3 (RoHS commercial) and M3 (halogen-free RoHS commercial) variants. HE3 parts undergo additional stress testing (HTOL, TC, ESD) and include lot-level traceability required for automotive safety-critical systems, as documented in Vishay's ordering information table (page 3, Document 88394).
What is the thermal resistance of SMCJ45CAHE3/57T, and how does it affect PCB layout?
The SMCJ45CAHE3/57T has RθJA = 75 °C/W when mounted on minimum recommended 8.0 mm × 8.0 mm copper pads per terminal (Vishay Doc 88394, page 3). This value assumes no added heatsink; reducing pad area increases junction temperature rise during repeated surges. For sustained surge duty, designers must maintain full pad dimensions and avoid thermal isolation - otherwise, TJ may exceed 150 °C and trigger parametric shift or failure.
Can SMCJ45CAHE3/57T replace SMCJ45AHE3/57T in an existing design?
No - SMCJ45CAHE3/57T is bidirectional while SMCJ45AHE3/57T is unidirectional; they are not functionally interchangeable. Substituting SMCJ45CAHE3/57T for SMCJ45AHE3/57T introduces unnecessary conduction path in forward bias and alters clamping behavior on single-polarity transients. Layout revision and circuit validation are required; Vishay explicitly separates these types in its ordering matrix and electrical tables.
SMCJ45CAHE3/57T 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)
SMCJ45CAHE3/57T FAQ
1.How can I place an order for SMCJ45CAHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45CAHE3/57T 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 SMCJ45CAHE3/57T reliable?
The price and inventory of SMCJ45CAHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ45CAHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ45CAHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45CAHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45CAHE3/57T?
SMCJ45CAHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45CAHE3/57T 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 SMCJ45CAHE3/57T?
For technical support, including SMCJ45CAHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45CAHE3/57T requirements.
6.How does Aetrix verify that SMCJ45CAHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ45CAHE3/57T 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 SMCJ45CAHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ45CAHE3/57T?
All SMCJ45CAHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45CAHE3/57T, 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 SMCJ45CAHE3/57T part is unused and in its original packaging.
Return procedure for SMCJ45CAHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ45CAHE3/57T Tags
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