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Vishay General Semiconductor - Diodes Division 1.5SMC51CA-M3/9AT
- Part No.:
- 1.5SMC51CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC51CA-M3/9AT.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC SMC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
1.5SMC51CA-M3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), with 51 V breakdown voltage (VBR = 48.5–53.6 V at IT = 1.0 mA), 43.6 V stand-off voltage (VWM), and 70.1 V maximum clamping voltage (VC) at 21.4 A peak pulse current - deployed for ESD and surge protection on automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the 1.5SMC51CA-M3/9AT datasheet, 1.5SMC51CA-M3/9AT pinout, 1.5SMC51CA-M3/9AT application, or 1.5SMC51CA-M3/9AT equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, SMC package mechanical data, thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification status, and RoHS-compliant halogen-free construction per JESD201 Class 2 whisker testing.
Technical Context
The 1.5SMC51CA-M3/9AT operates as a bidirectional avalanche diode, symmetrically clamping transient overvoltages in both polarities without polarity marking. Its glass-passivated junction enables fast response time (<1 ns) and low incremental surge resistance, critical for protecting sensitive analog front-ends against lightning-induced surges and inductive switching spikes.
Designed for surface-mount assembly on 8.0 mm × 8.0 mm copper pads, it sustains 1500 W peak pulse power under 10/1000 μs waveform at 0.01% duty cycle, with derating above TA = 25 °C per Fig. 2 and junction temperature range of –65 °C to +150 °C. It meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 1500 W - supports robust surge immunity per IEC 61000-4-5 Level 4 (4 kV) when properly mounted. |
| Stand-off Voltage VWM | 43.6 V - defines maximum continuous reverse operating voltage before leakage exceeds 1.0 μA. |
| Breakdown Voltage VBR | 48.5–53.6 V at 1.0 mA - ensures reliable avalanche conduction onset within tight tolerance band. |
| Clamping Voltage VC | 70.1 V at 21.4 A - limits transient voltage seen by protected IC to safe level during surge event. |
| Package | SMC (DO-214AB) - industry-standard 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height. |
| Junction-to-Ambient Thermal Resistance | RθJA = 75 °C/W - determines steady-state power dissipation limit (6.5 W at TA = 50 °C). |
| Operating Temperature Range | –65 °C to +150 °C - qualified for under-hood automotive and industrial environments. |
Pinout & Package
Package: SMC (DO-214AB), bidirectional device with no polarity marking; terminals are matte tin-plated leads, solderable per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional terminal pair | Either terminal serves as anode or cathode depending on transient polarity; no functional distinction required in layout. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power rating | Enables compliance with IEC 61000-4-5 surge immunity requirements up to 4 kV in standard PCB layouts. |
| Glass passivated chip junction | Ensures stable avalanche characteristics, low leakage (<1.0 μA at VWM), and long-term reliability under repeated transients. |
| Halogen-free, RoHS-compliant (M3 suffix) | Fulfills environmental compliance for automotive and industrial OEMs requiring JESD201 Class 2 whisker resistance. |
| AEC-Q101 qualified option available | Supports automotive-grade deployment; note: 1.5SMC51CA-M3/9AT itself is commercial-grade M3, not HE3/HM3 - AEC-Q101 requires suffix HE3 or HM3. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking, simplifying SMT production flow. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector entry point to shunt surge energy before reaching signal conditioning circuitry. Use Value: Limits transient voltage to ≤70.1 V during 21.4 A surge, preserving integrity of 5 V or 3.3 V rail-tied op-amps and ADC inputs. |
Use Scenario: Safeguarding 24 V digital input modules in programmable logic controllers against field-wiring induced surges and ground bounce. IC Role / Device Role / Timing Role: Parallel-connected TVS across input terminals to clamp fast-rising transients (tr < 1 ns) before optocoupler or Schmitt trigger input stage. Use Value: Maintains system uptime by preventing latch-up or permanent damage to microcontroller GPIOs during factory-floor ESD events. |
| Telecom Line Interface Protection | Consumer Appliance Motor Control |
Use Scenario: Shielding RS-485/RS-232 transceivers in base station backhaul equipment from lightning-induced common-mode surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Paired bidirectional TVS devices on differential lines to suppress asymmetric and symmetric transients without distorting signal integrity. Use Value: Delivers 1500 W surge handling while maintaining low capacitance (<100 pF at 0 V), minimizing signal attenuation at 10 Mbps rates. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machines and HVAC blowers that couple into MCU power rails and sensor traces. IC Role / Device Role / Timing Role: Mounted near motor driver IC output pins to clamp inductive kickback (L·di/dt) before it propagates into logic supply domains. Use Value: Prevents brownout resets and flash corruption in 32-bit MCUs by limiting rail sag and noise injection during motor startup/stall conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA | Lower peak power (600 W), same VBR/VC, SMB (DO-214AA) package (smaller footprint, higher RθJA = 90 °C/W) | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 without derating. | Select when board space is constrained and surge threat level is ≤2 kV. |
| 1.5KE51CA | Higher peak power (1500 W), axial-leaded DO-15 package, slower thermal response, not SMT-compatible | Requires through-hole assembly; incompatible with automated pick-and-place and reflow processes. | Choose only for legacy through-hole designs or prototyping where SMT is unavailable. |
Compared with SMBJ51CA and 1.5KE51CA, the 1.5SMC51CA-M3/9AT uniquely balances high surge capability (1500 W), SMT manufacturability, and thermal performance (RθJA = 75 °C/W) in a compact DO-214AB outline - making it optimal for volume automotive and industrial PCBs requiring AEC-Q101-ready scalability.
Availability
1.5SMC51CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, telecom line interface shielding, and consumer appliance motor control requiring stable component supply across multi-year production cycles.
Supply support for 1.5SMC51CA-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, TVS, MOSFETs, and optoelectronics with emphasis on reliability, power efficiency, and automotive-grade qualification.
The 1.5SMC Series targets high-energy transient suppression in space-constrained SMT applications, designed specifically for robust protection of automotive, industrial, and telecom systems against ESD, lightning, and inductive switching events.
FAQ
What does the "CA" suffix indicate in 1.5SMC51CA-M3/9AT?
The "CA" suffix in 1.5SMC51CA-M3/9AT denotes a bidirectional configuration - meaning the device provides symmetrical transient voltage clamping in both forward and reverse directions, with no polarity marking required. This distinguishes it from unidirectional variants (e.g., 1.5SMC51A), which feature a cathode band and conduct only in one direction. The 1.5SMC51CA-M3/9AT is therefore ideal for AC-coupled or differential signal lines where polarity reversal may occur.
Is 1.5SMC51CA-M3/9AT AEC-Q101 qualified?
No, the 1.5SMC51CA-M3/9AT is not AEC-Q101 qualified. It carries the M3 suffix, indicating halogen-free, RoHS-compliant commercial-grade construction. For AEC-Q101 qualification, Vishay specifies suffixes HE3 (RoHS-compliant, AEC-Q101) or HM3 (halogen-free, RoHS-compliant, AEC-Q101); examples include 1.5SMC51CAHE3_A/9AT. Always verify qualification status via the full ordering code and Vishay's official documentation before automotive use.
What is the maximum clamping voltage of 1.5SMC51CA-M3/9AT and at what current is it specified?
The maximum clamping voltage (VC) of the 1.5SMC51CA-M3/9AT is 70.1 V, measured at a peak pulse current (IPPM) of 21.4 A under the standardized 10/1000 μs double-exponential waveform. This value represents the upper bound of voltage the device allows across its terminals during a surge event, directly determining the stress imposed on downstream components like transceivers or microcontrollers.
How does the SMC (DO-214AB) package of 1.5SMC51CA-M3/9AT compare thermally to SMB (DO-214AA)?
The SMC (DO-214AB) package used by 1.5SMC51CA-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads, versus ~90 °C/W for the smaller SMB (DO-214AA) package. This 17% lower thermal resistance enables higher sustained power dissipation and improved reliability under repetitive surge conditions - a key advantage in thermally demanding automotive and industrial applications.
Can 1.5SMC51CA-M3/9AT be used in place of a unidirectional TVS like 1.5SMC51A?
No - the 1.5SMC51CA-M3/9AT is bidirectional and lacks polarity marking, while 1.5SMC51A is unidirectional with a defined cathode band. Substituting them requires verifying circuit topology: bidirectional use is mandatory for AC signals or differential buses (e.g., RS-485), whereas unidirectional devices are required for DC rail protection where reverse conduction must be blocked. Using 1.5SMC51CA-M3/9AT in a unidirectional design may cause unintended conduction or fail to meet leakage specifications.
1.5SMC51CA-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):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 21.4A
- 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)
1.5SMC51CA-M3/9AT FAQ
1.How can I place an order for 1.5SMC51CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC51CA-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 1.5SMC51CA-M3/9AT reliable?
The price and inventory of 1.5SMC51CA-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 1.5SMC51CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC51CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC51CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC51CA-M3/9AT?
1.5SMC51CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC51CA-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 1.5SMC51CA-M3/9AT?
For technical support, including 1.5SMC51CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC51CA-M3/9AT requirements.
6.How does Aetrix verify that 1.5SMC51CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC51CA-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 1.5SMC51CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC51CA-M3/9AT?
All 1.5SMC51CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC51CA-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 1.5SMC51CA-M3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC51CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC51CA-M3/9AT Tags
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