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Vishay General Semiconductor - Diodes Division SMCJ45A-M3/57T
- Part No.:
- SMCJ45A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45A-M3/57T.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,394
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Product details
Overview
SMCJ45A-M3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on power and signal lines. It features a 45 V standoff voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA, 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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMCJ45A-M3/57T datasheet, SMCJ45A-M3/57T pinout, SMCJ45A-M3/57T application, or SMCJ45A-M3/57T equivalent, key selection criteria include unidirectional polarity, halogen-free RoHS-compliant construction (M3 suffix), 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
The SMCJ45A-M3/57T operates as a silicon avalanche diode with glass-passivated junction, delivering fast response time (<1 ns) and stable clamping under repetitive or single-event transients. Its thermal resistance is 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), enabling reliable operation up to 150 °C junction temperature when mounted per recommended 8.0 mm × 8.0 mm copper pad layout.
It complies with J-STD-020 MSL Level 1 (peak reflow 260 °C), meets UL 497B recognition (QVGQ2), and supports AEC-Q101 qualification via alternate ordering codes (e.g., SMCJ45AHM3_X). The device exhibits +0.102 %/°C temperature coefficient of VBR and ≤1.0 µA reverse leakage at 45 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC bias margin for protected circuitry. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - Confirmed breakdown range ensures predictable turn-on threshold across production lots and temperature. |
| VC @ IPPM | 72.7 V at 20.6 A - Clamping voltage under 10/1000 µs surge; limits stress on downstream components during transient events. |
| PPPM | 1500 W - Peak pulse power handling capacity; determines survivability against lightning-induced or inductive-switching surges. |
| ID @ VWM | ≤1.0 µA - Ultra-low reverse leakage preserves efficiency in high-impedance or battery-powered circuits. |
| TJ max. | +150 °C - Enables use in under-hood automotive environments and thermally constrained industrial enclosures. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with cathode band marking; compatible with JEDEC-compliant pick-and-place equipment. |
Pinout & Package
SMCJ45A-M3/57T uses the SMC (DO-214AB) package: molded plastic case with matte tin-plated leads, 0.220–0.246 inch body width, 0.260–0.280 inch length, and cathode band marking on the anode side. Terminals are solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when voltage exceeds VBR. |
| Anode | Reference/ground return | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMC package | Enables high-density PCB layouts and compatibility with automated SMT assembly lines without height interference. |
| Glass-passivated chip junction | Ensures long-term reliability and stable electrical parameters under thermal cycling and humidity exposure. |
| 1500 W peak pulse power rating | Provides robust protection against IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges without degradation. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for automotive and industrial OEM supply chains. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and direct placement into reflow ovens without baking preconditioning. |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V automotive power rails from load-dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input stage. Use Value: Clamps spikes up to 72.7 V while absorbing 1500 W surges, preventing damage to downstream PMICs and microcontrollers. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role / Timing Role: TVS connected across differential signal pair or single-ended output to ground. Use Value: Sub-1 ns response and ≤1.0 µA leakage preserve signal integrity and measurement accuracy in precision sensing systems. |
| Telecom Line Card Surge Protection | Consumer Power Adapter Input Stage |
|
Use Scenario: Safeguarding Ethernet PHY power pins and auxiliary control lines in outdoor telecom equipment. IC Role / Device Role / Timing Role: Primary clamping device on 3.3 V/5 V bias rails feeding interface ICs. Use Value: 75 °C/W RθJA enables operation in sealed enclosures without forced airflow, supporting fanless designs. |
Use Scenario: Suppressing switching noise and external surges at AC-DC adapter primary-side rectifier output. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor to limit voltage overshoot during startup or fault. Use Value: 20.6 A IPPM and 72.7 V VC ensure compatibility with 100–240 VAC input surge standards (IEC 61000-4-5). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A-E3/57T | Lower PPPM (400 W), smaller SMA package, higher RθJA (110 °C/W), same VWM/VBR/VC ratings. | Restricted to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 or automotive load-dump. | Select when board space is critical and surge energy is limited to <400 W. |
| SMCJ45CA-M3/57T | Bidirectional variant; identical VWM (45 V), symmetric VBR (50.0–55.3 V), same PPPM/VC but no polarity marking. | Required for AC-coupled or floating signal lines where reverse polarity transients occur (e.g., RS-485, CAN bus). | Choose only when bidirectional clamping is mandatory; unidirectional SMCJ45A-M3/57T offers better leakage performance. |
Compared with SMAJ45A-E3/57T, the SMCJ45A-M3/57T delivers 3.75× higher surge power handling and superior thermal dissipation; versus SMCJ45CA-M3/57T, it provides lower leakage and defined polarity for DC-biased protection schemes.
Availability
SMCJ45A-M3/57T is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom line card surge suppression requiring stable component supply, halogen-free compliance, and AEC-Q101 traceability pathways.
Supply support for SMCJ45A-M3/57T 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, power efficiency, and automotive-grade qualification.
The SMCJ series was developed specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where 1500 W surge immunity and 150 °C operation are mandatory.
FAQ
What is the maximum clamping voltage of the SMCJ45A-M3/57T under a 10/1000 µs surge?
The SMCJ45A-M3/57T has a maximum clamping voltage (VC) of 72.7 V when subjected to its rated peak pulse current of 20.6 A using the standardized 10/1000 µs waveform. This value is measured at TA = 25 °C with the device mounted on 8.0 mm × 8.0 mm copper pads per Vishay's recommended layout. The SMCJ45A-M3/57T maintains this clamping performance across its full operating temperature range, making it suitable for protecting sensitive 48 V nominal systems.
Does the SMCJ45A-M3/57T meet automotive qualification standards?
The SMCJ45A-M3/57T itself is commercial-grade (M3 suffix), but Vishay offers AEC-Q101 qualified versions under the HM3 suffix (e.g., SMCJ45AHM3_X). While the SMCJ45A-M3/57T shares identical electrical and thermal specifications with its automotive-grade counterparts, it lacks formal AEC-Q101 certification documentation. For production automotive applications, engineers should specify SMCJ45AHM3_X variants; the SMCJ45A-M3/57T remains appropriate for industrial and telecom designs requiring halogen-free RoHS compliance.
How does the SMCJ45A-M3/57T differ from the SMCJ45CA-M3/57T?
The SMCJ45A-M3/57T is unidirectional with a cathode band marking and specified forward characteristics (VF = 3.5 V at 100 A), whereas the SMCJ45CA-M3/57T is bidirectional with no polarity marking and symmetric breakdown in both directions. Both share identical VWM (45 V), VBR (50.0–55.3 V), PPPM (1500 W), and VC (72.7 V), but the SMCJ45A-M3/57T exhibits ≤1.0 µA reverse leakage at VWM versus doubled ID limit (2.0 µA) for the CA version per datasheet note (3). The SMCJ45A-M3/57T is preferred for DC-biased protection paths.
What is the thermal resistance of the SMCJ45A-M3/57T, and how does it affect PCB layout?
The SMCJ45A-M3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W when mounted per Vishay's recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad layout. To achieve rated power dissipation and avoid thermal runaway, PCBs must allocate sufficient copper area on both sides connected to the terminals. Reducing pad size increases RθJA significantly - e.g., halving pad area may raise RθJA by >30 % - directly limiting sustained surge repetition rate and derating above 25 °C ambient.
Can the SMCJ45A-M3/57T be used in place of SMAJ45A-E3/57T without layout changes?
No - the SMCJ45A-M3/57T uses the larger SMC (DO-214AB) package (0.260–0.280" length), while the SMAJ45A-E3/57T uses the smaller SMA (DO-214AC) package (0.205–0.225" length). Their footprints are not interchangeable: SMC requires longer pads and greater terminal spacing. Attempting substitution without layout revision risks solder bridging, insufficient creepage, or mechanical stress. The SMCJ45A-M3/57T also delivers 1500 W PPPM versus 400 W for SMAJ45A-E3/57T - a functional upgrade that demands physical redesign.
SMCJ45A-M3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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)
SMCJ45A-M3/57T FAQ
1.How can I place an order for SMCJ45A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45A-M3/57T 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 SMCJ45A-M3/57T reliable?
The price and inventory of SMCJ45A-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ45A-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ45A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45A-M3/57T?
SMCJ45A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45A-M3/57T 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 SMCJ45A-M3/57T?
For technical support, including SMCJ45A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45A-M3/57T requirements.
6.How does Aetrix verify that SMCJ45A-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ45A-M3/57T 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 SMCJ45A-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ45A-M3/57T?
All SMCJ45A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45A-M3/57T, 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 SMCJ45A-M3/57T part is unused and in its original packaging.
Return procedure for SMCJ45A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ45A-M3/57T Tags
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