My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ45CAHE3_A/I
- Part No.:
- SMCJ45CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45CAHE3_A/I.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,165
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ45CAHE3_A/I 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 clamping voltage (VC) at 20.6 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM). It protects sensitive signal lines and power rails in automotive ECUs and industrial sensor interfaces against lightning-induced transients and inductive switching spikes.
For engineers reviewing the SMCJ45CAHE3_A/I datasheet, SMCJ45CAHE3_A/I pinout, SMCJ45CAHE3_A/I application, or SMCJ45CAHE3_A/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification for automotive use, low thermal resistance (RθJL = 15 °C/W), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protector using an avalanche breakdown mechanism, with symmetrical forward/reverse breakdown characteristics due to its bidirectional construction. It responds within picoseconds to transients and maintains stable clamping across -55 °C to +150 °C junction temperature range.
Designed for unclamped inductive load switching events, it delivers 1500 W peak pulse power handling under 10/1000 μs waveform per IEC 61000-4-5, with incremental surge resistance optimized for minimal voltage overshoot during fast-rising surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 50.0 V / 55.3 V - Breakdown occurs within this range at 1 mA test current, ensuring reliable turn-on margin |
| VC @ IPPM | 72.7 V - Clamped voltage seen by protected circuit during full 20.6 A surge, limiting stress on downstream ICs |
| PPPM | 1500 W - Peak transient energy absorption capability under standardized 10/1000 μs waveform |
| RθJL | 15 °C/W - Low junction-to-lead thermal resistance enables efficient heat transfer to PCB copper pads |
| TJ max | +150 °C - Maximum allowable junction temperature supports operation in under-hood automotive environments |
| AEC-Q101 | Qualified - Meets stress testing requirements for automotive electronic components including temperature cycling and HTRB |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. No polarity marking on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode) | Surge current path terminal | Bidirectional conduction - either terminal serves as cathode or anode depending on transient polarity |
| Anode (Cathode) | Surge current path terminal | Identical electrical role to opposite terminal; no functional distinction in CA-series devices |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and body electronics |
| 1500 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) without degradation |
| Low RθJL = 15 °C/W | Enables effective thermal coupling to PCB copper, reducing risk of thermal runaway during repetitive surges |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns |
| Glass passivated junction | Ensures long-term reliability and stable electrical parameters under humidity and temperature cycling |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power rails in vehicle infotainment modules from load-dump and jump-start transients. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed directly at power entry point upstream of DC/DC converter input. Use Value: Limits transient voltage to ≤72.7 V, preventing damage to 36 V-rated input stages while maintaining AEC-Q101 compliance. | Use Scenario: Shielding RS-485 transceiver signal lines in factory automation PLC I/O modules from ESD and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional clamping element across differential pair, referenced to local ground plane. Use Value: Symmetrical clamping ensures equal protection for both polarities of fast transients, preserving signal integrity up to 10 Mbps. |
| Telecom Line Card Surge Suppression | Consumer Appliance Motor Drive Protection |
Use Scenario: Guarding Ethernet PHY interface circuits in telecom access equipment against induced lightning surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS mounted at RJ-45 connector feedthrough, coordinated with secondary GDT or polymer PTC. Use Value: 1500 W rating handles multi-kA surge currents while maintaining sub-100 ns response time to prevent latch-up in PHY ICs. | Use Scenario: Safeguarding gate drivers and MCU GPIOs in smart washing machine motor control boards exposed to brush-commutator noise. IC Role / Device Role / Timing Role: Localized clamping device placed near motor driver IC outputs and feedback sensing nodes. Use Value: 45 V VWM aligns with 24–48 V motor bus systems, enabling robust suppression of <100 ns switching spikes without leakage interference. |
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-E3/57T | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (100 °C/W) | Suitable for space-constrained consumer electronics but insufficient for automotive-level surge immunity | Select when board area is critical and surge energy is limited to IEC 61000-4-2 ESD only |
| SMCJ45CAHM3_A/I | Halogen-free variant with identical electrical specs and AEC-Q101 qualification | Same automotive and industrial use cases; differs only in material composition compliance | Choose for RoHS-compliant, halogen-free supply chain requirements without performance trade-offs |
Compared with SMCJ45CAHE3_A/I, SMAJ45CA-E3/57T offers reduced surge capacity in a smaller footprint, while SMCJ45CAHM3_A/I provides identical protection performance with halogen-free construction-enabling direct substitution where material compliance drives sourcing decisions.
Availability
SMCJ45CAHE3_A/I is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom line card prototyping requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ45CAHE3_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 and application-specific optimization.
The SMCJ series targets high-energy transient suppression in harsh environments, engineered specifically for automotive, industrial, and telecom infrastructure where sustained surge immunity and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMCJ45CAHE3_A/I at its rated peak pulse current?
The SMCJ45CAHE3_A/I has a maximum clamping voltage (VC) of 72.7 V when subjected to its rated peak pulse current (IPPM) of 20.6 A under a 10/1000 μs waveform. This value is measured per JEDEC standards and ensures downstream components experience controlled overvoltage stress during surge events. The SMCJ45CAHE3_A/I maintains this clamping performance across its full operating temperature range.
Is SMCJ45CAHE3_A/I suitable for automotive applications?
Yes, SMCJ45CAHE3_A/I is AEC-Q101 qualified and explicitly designed for automotive use, including engine control units, body electronics, and ADAS sensor interfaces. Its construction meets MSL Level 1 reflow requirements, glass passivated junction ensures long-term reliability under thermal cycling, and bidirectional clamping supports dual-polarity transients common in vehicle power networks. The SMCJ45CAHE3_A/I data sheet confirms qualification per AEC-Q101 Rev D.
How does the SMCJ45CAHE3_A/I differ from unidirectional SMCJ45A variants?
The SMCJ45CAHE3_A/I is bidirectional, meaning it clamps symmetrically in both forward and reverse directions, whereas the unidirectional SMCJ45A has a defined cathode band and clamps only in reverse bias. Electrically, SMCJ45CAHE3_A/I exhibits matched VBR and VC in both polarities, making it ideal for AC-coupled or differential signal lines. The SMCJ45CAHE3_A/I also lacks polarity marking on the package body.
What is the thermal resistance from junction to ambient for SMCJ45CAHE3_A/I?
The typical junction-to-ambient thermal resistance (RθJA) for SMCJ45CAHE3_A/I is 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as specified in the Vishay datasheet. This value assumes standard FR-4 PCB layout; actual performance improves with larger copper areas or internal layers. The SMCJ45CAHE3_A/I's lower RθJL of 15 °C/W further supports heat dissipation into the PCB.
Can SMCJ45CAHE3_A/I be used in place of SMCJ45A in existing designs?
No, SMCJ45CAHE3_A/I is not a drop-in replacement for unidirectional SMCJ45A due to fundamental polarity differences: SMCJ45CAHE3_A/I is bidirectional with no cathode marking, while SMCJ45A requires correct orientation during placement. Substituting SMCJ45CAHE3_A/I may cause unintended conduction in DC-biased circuits. Review schematic polarity and signal topology before considering SMCJ45CAHE3_A/I as an alternative to SMCJ45A.
SMCJ45CAHE3_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):
- 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_A/I FAQ
1.How can I place an order for SMCJ45CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45CAHE3_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 SMCJ45CAHE3_A/I reliable?
The price and inventory of SMCJ45CAHE3_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 SMCJ45CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ45CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45CAHE3_A/I?
SMCJ45CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45CAHE3_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 SMCJ45CAHE3_A/I?
For technical support, including SMCJ45CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45CAHE3_A/I requirements.
6.How does Aetrix verify that SMCJ45CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ45CAHE3_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 SMCJ45CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ45CAHE3_A/I?
All SMCJ45CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45CAHE3_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 SMCJ45CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMCJ45CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ45CAHE3_A/I Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
