My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ45CA-M3/9AT
- Part No.:
- SMCJ45CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45CA-M3/9AT.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,966
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ45CA-M3/9AT 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 (VC) at 20.6 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O protection, and telecom line conditioning.
For engineers reviewing the SMCJ45CA-M3/9AT datasheet, SMCJ45CA-M3/9AT pinout, SMCJ45CA-M3/9AT application, or SMCJ45CA-M3/9AT equivalent, key selection criteria include bidirectional clamping symmetry, low incremental surge resistance, AEC-Q101 qualification eligibility (via HM3 suffix), and compatibility with automated SMT placement on 8 mm × 8 mm copper pads.
Technical Context
This device operates as a voltage-clamped crowbar during transients, leveraging an avalanche breakdown mechanism with symmetrical forward/reverse conduction. Its bidirectional structure eliminates polarity sensitivity, enabling direct placement across AC-coupled or differential lines without orientation checks.
Thermal performance is defined by RθJA = 75 °C/W (typ.) and RθJL = 15 °C/W (typ.), supporting operation from –55 °C to +150 °C junction temperature. The halogen-free M3 termination meets JESD201 Class 2 whisker resistance and J-STD-002 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR min/max | 50.0 V / 55.3 V at IT = 1.0 mA - Verified breakdown threshold ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 72.7 V at 20.6 A - Clamping voltage limits downstream voltage stress under full-rated 1500 W surge. |
| PPPM | 1500 W - Peak pulse power handling per 10/1000 μs waveform; enables robust protection against lightning-induced surges. |
| IPPM | 20.6 A - Peak pulse current capability directly correlates with energy absorption (E ≈ 1.2 × VC × IPPM × tp). |
| TJ max | +150 °C - Maximum junction temperature supports under-hood automotive and high-ambient industrial use. |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; optimized for reflow and wave soldering. |
Pinout & Package
SMCJ45CA-M3/9AT uses the standard SMC (DO-214AB) package: two-terminal, unmarked bidirectional construction with no cathode/anode polarity designation. Terminals are matte tin-plated leads compliant with J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as input/output path; symmetric conduction allows placement across any two-node interface without orientation constraints. |
| Terminal 2 | Anode/Cathode (bidirectional) | Paired terminal completes the TVS path; both terminals share identical voltage-current characteristics in either direction. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), and floating power rails without polarity concerns. |
| 1500 W peak pulse rating | Supports IEC 61000-4-5 Level 4 (4 kV surge) compliance when paired with appropriate PCB layout (8 mm × 8 mm copper pads). |
| Halogen-free M3 termination | Meets RoHS and JEDEC JESD201 Class 2 whisker resistance requirements for long-term reliability in harsh environments. |
| Low clamping ratio (VC/VBR) | 1.45 (72.7 V / 50.0 V) ensures minimal overvoltage overshoot during fast transients, preserving downstream IC integrity. |
| AEC-Q101 qualification path | HM3 variant available - enables drop-in qualification for automotive applications including body control modules and ADAS sensor interfaces. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed between signal line and ground or differential pair, responding within <1 ps to limit transient voltage excursion. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V sensor front-ends by clamping to ≤72.7 V while absorbing up to 1500 W surge energy. | Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to inductive switching noise from solenoids and contactors. IC Role / Device Role / Timing Role: Bidirectional shunt protector across 24 V DC input terminals, conducting surge current away from optocoupler input stages. Use Value: Maintains functional safety integrity by limiting transient voltage to <75 V during 1 kV/500 A surge events per IEC 61000-4-4, reducing field failure rates. |
| Telecom Line Interface | Consumer Power Adapter ESD Protection |
Use Scenario: Shielding Ethernet PHY interfaces and DSL line drivers from lightning-induced surges entering via RJ-45 jacks. IC Role / Device Role / Timing Role: Primary-level TVS on twisted-pair differential lines, placed before common-mode chokes to handle longitudinal mode surges. Use Value: Achieves >20 kV ESD immunity (IEC 61000-4-2) and 4 kV surge immunity (IEC 61000-4-5) without degrading signal integrity at 100 MHz. | Use Scenario: Protecting secondary-side 12 V/19 V DC outputs of wall adapters from user-handling ESD and accidental short-circuit transients. IC Role / Device Role / Timing Role: Secondary-side clamp between output rail and ground, activated only during overvoltage faults to avoid steady-state leakage. Use Value: Limits output voltage to 72.7 V during 1500 W surge, preventing damage to connected devices while maintaining <1 μA leakage at 45 V. |
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), higher VC (73.0 V at 5.5 A) | Targeted at space-constrained consumer electronics; insufficient for industrial 1500 W surge requirements. | Select SMCJ45CA-M3/9AT when 1500 W surge handling and thermal robustness are required. |
| SMCJ45A-M3/9AT | Unidirectional version; same VWM, VBR, VC, and PPPM, but asymmetric conduction (cathode band marked) | Requires polarity-aware layout; unsuitable for AC or differential signal lines without external rectification. | Choose SMCJ45CA-M3/9AT for polarity-agnostic placement on bidirectional interfaces like RS-485 or CAN FD. |
Compared with SMAJ45CA-E3/61T and SMCJ45A-M3/9AT, the SMCJ45CA-M3/9AT uniquely delivers 1500 W bidirectional clamping in an industry-standard SMC package - enabling single-device protection of floating, AC-coupled, or differential circuits without layout redesign or derating.
Availability
SMCJ45CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line conditioning requiring stable component supply and halogen-free compliance.
Supply support for SMCJ45CA-M3/9AT 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered for high-energy transient suppression in automotive, industrial, and communications systems where robustness and AEC-Q101 qualification readiness are critical.
FAQ
What does the "CA" suffix indicate in SMCJ45CA-M3/9AT?
The "CA" suffix in SMCJ45CA-M3/9AT denotes a bidirectional configuration, meaning the device provides symmetrical clamping in both forward and reverse directions. This eliminates polarity dependency during PCB placement and makes it ideal for protecting AC-coupled lines, differential interfaces like RS-485 or CAN, and floating power rails - unlike unidirectional variants (e.g., SMCJ45A-M3/9AT) that require cathode alignment.
Is SMCJ45CA-M3/9AT qualified to AEC-Q101?
The SMCJ45CA-M3/9AT itself is not AEC-Q101 qualified, but Vishay offers the HM3-suffixed variant (e.g., SMCJ45CAHM3_A/I) which carries full AEC-Q101 qualification. The M3 suffix indicates halogen-free, RoHS-compliant commercial-grade construction; automotive qualification requires explicit HM3 ordering code and associated test documentation.
What is the maximum clamping voltage of SMCJ45CA-M3/9AT and under what test condition?
The maximum clamping voltage of SMCJ45CA-M3/9AT is 72.7 V, measured at a peak pulse current (IPPM) of 20.6 A using the standardized 10/1000 μs double-exponential surge waveform. This value is guaranteed across the full operating temperature range (–55 °C to +150 °C) and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
How does the SMC (DO-214AB) package of SMCJ45CA-M3/9AT affect thermal performance?
The SMC (DO-214AB) package of SMCJ45CA-M3/9AT delivers RθJA = 75 °C/W (typ.) and RθJL = 15 °C/W (typ.), enabling effective heat dissipation during repetitive surge events. When mounted on 8.0 mm × 8.0 mm copper pads per terminal - as specified in Vishay's datasheet - the package sustains full 1500 W pulse power without exceeding TJ = 150 °C, making it suitable for high-reliability industrial and automotive applications.
Can SMCJ45CA-M3/9AT be used in place of a unidirectional TVS like SMCJ45A-M3/9AT?
SMCJ45CA-M3/9AT can replace SMCJ45A-M3/9AT only in applications where bidirectional clamping is acceptable or required - such as AC signal lines or differential buses. It must not be substituted in unidirectional DC circuits relying on forward conduction (e.g., reverse-polarity protection), as its symmetrical structure lacks inherent polarity. Layout changes may be needed to remove cathode orientation constraints.
SMCJ45CA-M3/9AT 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 (SMC)
SMCJ45CA-M3/9AT FAQ
1.How can I place an order for SMCJ45CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45CA-M3/9AT 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-M3/9AT reliable?
The price and inventory of SMCJ45CA-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ45CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ45CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45CA-M3/9AT?
SMCJ45CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45CA-M3/9AT 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-M3/9AT?
For technical support, including SMCJ45CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45CA-M3/9AT requirements.
6.How does Aetrix verify that SMCJ45CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ45CA-M3/9AT 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-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ45CA-M3/9AT?
All SMCJ45CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45CA-M3/9AT, 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-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ45CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ45CA-M3/9AT 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 …
