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Vishay General Semiconductor - Diodes Division 1.5SMC43CA-M3/9AT
- Part No.:
- 1.5SMC43CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC43CA-M3/9AT.pdf
- Description:
- TVS DIODE 36.8VWM 59.3VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:4,633
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Product details
Overview
1.5SMC43CA-M3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 43 V breakdown voltage (VBR min/max = 40.9–45.2 V at 1 mA), 36.8 V stand-off voltage (VWM), clamps to ≤59.3 V at 25.3 A peak pulse current (10/1000 µs), and delivers 1500 W peak pulse power. It is widely deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the 1.5SMC43CA-M3/9AT datasheet, 1.5SMC43CA-M3/9AT pinout, 1.5SMC43CA-M3/9AT application, or 1.5SMC43CA-M3/9AT equivalent, key selection criteria include bidirectional clamping capability, SMC (DO-214AB) package compatibility, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), and compliance with UL 497B surge protector standards.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at VWM), while the 10/1000 µs waveform rating reflects real-world lightning and inductive-switching surge immunity.
The device is rated for 150 °C maximum junction temperature and meets J-STD-020 MSL Level 1, supporting lead-free reflow up to 260 °C peak. Its low incremental surge resistance and fast response time (<1.0 ns) minimize let-through energy during transient events, preserving downstream ICs like microcontrollers and CAN transceivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 40.9 V / 45.2 V at 1 mA - defines reliable conduction onset under bidirectional surge conditions |
| VWM | 36.8 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VC @ IPPM | ≤59.3 V at 25.3 A - clamping voltage limiting stress on protected circuitry during 1500 W surges |
| PPPM | 1500 W (10/1000 µs) - peak surge power handling capacity per industry-standard waveform |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, critical for derating in enclosed PCB layouts |
| Package | SMC (DO-214AB) - standardized 2-pin surface-mount outline with 8.0 mm × 8.0 mm copper pad requirement |
| Compliance | UL 497B recognized (QVGQ2), RoHS-compliant, halogen-free (M3 suffix), JESD201 Class 2 whisker resistant |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads; polarity-unmarked for bidirectional operation; meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (either polarity) | One of two symmetrical terminals; no fixed polarity-functions as cathode or anode depending on instantaneous voltage polarity |
| Cathode | Transient current exit (either polarity) | Second symmetrical terminal; identical physical and electrical role to Anode in bidirectional configuration |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), and floating sensors without external polarity management |
| 1500 W peak pulse power | Withstands high-energy transients from ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 Level 4 surges |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during clamping-critical for protecting 3.3 V or 5 V logic interfaces |
| AEC-Q101 qualified option | Available in HM3 variant-validates reliability for automotive powertrain and body electronics applications |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking, reducing manufacturing overhead |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines (e.g., 0–10 V, 4–20 mA) of engine control unit (ECU) sensors from load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS placed at connector interface to shunt surge energy before it reaches precision DACs or op-amps. Use Value: Clamps transients to ≤59.3 V while maintaining <1 µA leakage at 36.8 V, ensuring signal integrity and long-term stability in harsh automotive environments. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers against ESD and field-wiring induced surges. IC Role / Device Role / Timing Role: Primary front-end protection on 24 V DC inputs, positioned ahead of optocouplers and level-shifters. Use Value: 1500 W surge rating and 75 °C/W thermal resistance enable reliable operation in unventilated control cabinets with ambient temperatures up to 85 °C. |
| Telecom Line Interface | Consumer Power Adapter Output |
Use Scenario: Protecting Ethernet PHY magnetics and PoE injectors from lightning-induced common-mode surges on twisted-pair lines. IC Role / Device Role / Timing Role: Bidirectional TVS across differential pairs (e.g., TX+/TX−) to suppress mode conversion and maintain signal symmetry. Use Value: Symmetrical VBR tolerance (±5%) and low capacitance (<100 pF at 0 V) preserve 100BASE-TX signal integrity up to 100 MHz. |
Use Scenario: Secondary-side overvoltage suppression on 12 V/19 V outputs of wall-mounted AC/DC adapters used in laptops and monitors. IC Role / Device Role / Timing Role: Final-stage clamp preventing fault propagation from regulator failure or capacitor short into connected devices. Use Value: Fast response (<1 ns) and low VC/VBR ratio ensure downstream USB-C PD controllers and display drivers remain within absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43CA | Lower peak power (600 W), same VBR range and SMC-equivalent SMB (DO-214AA) package | Not suitable for IEC 61000-4-5 Level 4; limited to lower-energy surges in consumer-grade equipment | Select when board space is constrained and surge threat level is ≤Level 3; verify layout thermal relief for 600 W dissipation |
| 1.5KE43CA | Higher power (1500 W), axial-leaded DO-201AE package; slower thermal response due to leadframe construction | Requires through-hole assembly; unsuitable for automated SMT lines or high-density PCBs | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required |
Compared with SMBJ43CA and 1.5KE43CA, the 1.5SMC43CA-M3/9AT uniquely combines 1500 W SMT capability, bidirectional symmetry, halogen-free compliance, and MSL Level 1 process compatibility-making it optimal for high-reliability automotive and industrial production.
Availability
1.5SMC43CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer power adapter outputs requiring stable component supply and full traceability.
Supply support for 1.5SMC43CA-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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The 1.5SMC Series was engineered for high-power, surface-mount transient suppression in demanding environments-including automotive, industrial automation, and telecommunications-where compact size, repeatable clamping, and AEC-Q101 validation are mandatory.
FAQ
What does the "CA" suffix indicate in 1.5SMC43CA-M3/9AT?
The "CA" suffix in 1.5SMC43CA-M3/9AT denotes a bidirectional configuration-meaning the device provides symmetrical transient voltage suppression for both positive and negative polarity surges. Unlike unidirectional variants (e.g., 1.5SMC43A), the 1.5SMC43CA-M3/9AT has no polarity marking and functions identically regardless of voltage polarity applied across its terminals.
Is 1.5SMC43CA-M3/9AT AEC-Q101 qualified?
The base 1.5SMC43CA-M3/9AT is halogen-free and RoHS-compliant but not AEC-Q101 qualified. For automotive applications requiring AEC-Q101 validation, the equivalent part is 1.5SMC43CAHM3_A/I (or HM3_B/I for higher voltage grades), which carries the HM3 suffix and explicit AEC-Q101 qualification per Vishay documentation.
What is the maximum clamping voltage of 1.5SMC43CA-M3/9AT under surge conditions?
The 1.5SMC43CA-M3/9AT clamps to a maximum of 59.3 V when subjected to its rated peak pulse current of 25.3 A (10/1000 µs waveform). This value is guaranteed per Vishay's datasheet and represents the upper limit of voltage seen by protected circuitry during worst-case transient events.
Can 1.5SMC43CA-M3/9AT be used in place of a unidirectional TVS like 1.5SMC43A?
No-1.5SMC43CA-M3/9AT is strictly bidirectional and must not replace unidirectional types such as 1.5SMC43A in circuits requiring forward conduction (e.g., DC power rail protection with polarity-sensitive biasing). Substitution would compromise protection integrity and may cause unintended conduction during normal operation.
What PCB pad layout is required for optimal thermal performance of 1.5SMC43CA-M3/9AT?
Vishay specifies a minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad area per terminal for 1.5SMC43CA-M3/9AT to achieve rated 1500 W pulse power and 75 °C/W thermal resistance. Reduced pad area will increase junction temperature and require significant derating of peak pulse current per Figure 2 in the datasheet.
1.5SMC43CA-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 36.8V
- Voltage - Breakdown (Min):
- 40.9V
- Voltage - Clamping (Max) @ Ipp:
- 59.3V
- Current - Peak Pulse (10/1000µs):
- 25.3A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
1.5SMC43CA-M3/9AT FAQ
1.How can I place an order for 1.5SMC43CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC43CA-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 1.5SMC43CA-M3/9AT reliable?
The price and inventory of 1.5SMC43CA-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 1.5SMC43CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC43CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC43CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC43CA-M3/9AT?
1.5SMC43CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC43CA-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 1.5SMC43CA-M3/9AT?
For technical support, including 1.5SMC43CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC43CA-M3/9AT requirements.
6.How does Aetrix verify that 1.5SMC43CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC43CA-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 1.5SMC43CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC43CA-M3/9AT?
All 1.5SMC43CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC43CA-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 1.5SMC43CA-M3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC43CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC43CA-M3/9AT Tags
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