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Vishay General Semiconductor - Diodes Division 1.5SMC51CA-E3/9AT
- Part No.:
- 1.5SMC51CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC51CA-E3/9AT.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:6,605
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Product details
Overview
1.5SMC51CA-E3/9AT 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 51 V breakdown voltage (VBR = 48.5–53.6 V at 1 mA), 70.1 V maximum clamping voltage (VC) at 21.4 A peak pulse current, and 1500 W peak pulse power capability with a 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection circuits.
For engineers reviewing the 1.5SMC51CA-E3/9AT datasheet, 1.5SMC51CA-E3/9AT pinout, 1.5SMC51CA-E3/9AT application, or 1.5SMC51CA-E3/9AT equivalent, this device delivers verified bidirectional clamping performance, RoHS-compliant SMC (DO-214AB) packaging, AEC-Q101 qualification readiness (via HE3/HM3 variants), and stable thermal derating up to 150 °C junction temperature.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical electrical characteristics in forward and reverse directions - enabling single-device protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures low leakage (<1 µA at 43.6 V stand-off) and fast response time (<1.0 ps typical), critical for suppressing ESD and lightning-induced transients.
The device uses a low-inductance SMC (DO-214AB) package mounted on 8.0 mm × 8.0 mm copper pads, achieving 15 °C/W junction-to-lead thermal resistance and supporting repetitive surge duty cycles up to 0.01 %. It meets MSL Level 1 per J-STD-020 and withstands 200 A peak forward surge (8.3 ms half-sine) in unidirectional configurations - though 1.5SMC51CA-E3/9AT itself is bidirectional and lacks polarity marking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 48.5–53.6 V at 1 mA test current - defines precise voltage threshold where clamping initiates under transient stress |
| Stand-off Voltage (VWM) | 43.6 V maximum - ensures reliable non-conduction during normal circuit operation up to rated DC/AC working voltage |
| Clamping Voltage (VC) | 70.1 V at 21.4 A IPPM - limits peak voltage seen by protected ICs during 10/1000 µs surges, preserving downstream component integrity |
| Peak Pulse Power (PPPM) | 1500 W - sustains high-energy transients (e.g., ISO 7637-2 Pulse 5a) without failure when properly heatsinked |
| Junction Temperature Range | −65 to +150 °C - supports operation in under-hood automotive, industrial control, and outdoor telecom environments |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 3.2 mm height and 7.75 mm body length, compatible with automated pick-and-place |
| RoHS Compliance | E3 suffix - lead-free matte tin-plated terminals, compliant with EU RoHS Directive 2011/65/EU and JESD201 Class 2 whisker resistance |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads; no polarity marking for bidirectional configuration; terminals solderable per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional terminal pair | No functional distinction - either terminal serves as anode or cathode depending on instantaneous polarity of transient event |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Enables protection against severe automotive load-dump and lightning-induced surges without cascading failure |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage stress on protected MOSFETs or microcontrollers during clamping events |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life before reflow - eliminates baking requirements and simplifies SMT manufacturing |
| Glass-passivated junction | Ensures stable leakage current (<1 µA at VWM) and long-term reliability under thermal cycling and humidity exposure |
| AEC-Q101 qualification path | HE3/HM3 variants available - supports direct migration to automotive-grade production without redesign |
Applications
| Automotive Sensor Interface Protection | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from ISO 7637-2 pulses and ESD events in engine control units. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential signal pairs or supply rails to limit transient excursions before they reach sensitive ASIC inputs. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V sensor signal conditioners while maintaining signal fidelity due to low capacitance (<100 pF at 0 V). |
Use Scenario: Safeguarding 4–20 mA current loop receivers and ±10 V analog input stages in programmable logic controllers exposed to field wiring transients. IC Role / Device Role / Timing Role: Primary overvoltage suppression element installed at connector entry points to shunt induced surges away from precision op-amps and ADC drivers. Use Value: Maintains measurement accuracy by clamping transients below 70.1 V without adding series impedance or distorting low-frequency analog signals. |
| Telecom Line Card Surge Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Shielding Ethernet PHYs, DSL line drivers, and POTS interface ICs from lightning-induced surges entering via external cabling in network equipment. IC Role / Device Role / Timing Role: First-line defense TVS mounted adjacent to RJ-45 jacks or line transformers to absorb common-mode and differential-mode energy. Use Value: Achieves UL 497B recognition (QVGQ2 file E136766) and meets IEC 61000-4-5 Level 4 immunity requirements with minimal PCB footprint. |
Use Scenario: Suppressing inductive kickback from brushed DC motors and solenoids in washing machines, HVAC actuators, and power tools. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor across motor terminals or H-bridge outputs to clamp flyback voltages during PWM switching. Use Value: Extends MOSFET lifetime by limiting VDS spikes to ≤70.1 V, eliminating need for larger, costlier snubbers or higher-voltage-rated switches. |
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 pulse power (600 W), same VBR range and SMC-compatible SMB (DO-214AA) package | Reduced surge handling margin; suitable only for lower-energy transients (e.g., IEC 61000-4-2 ESD, not lightning) | Select when board space is constrained and surge threat level is limited to Class 3 ESD or low-duty-cycle switching noise |
| 1.5KE51CA | Higher package profile (DO-201AE), through-hole mounting, identical 1500 W rating and 51 V VBR | Not suitable for automated SMT assembly; requires wave solder or hand-soldering; better heat dissipation in high-ambient environments | Choose for legacy through-hole designs or high-reliability industrial systems where manual assembly and thermal mass outweigh SMT benefits |
Compared with SMBJ51CA and 1.5KE51CA, the 1.5SMC51CA-E3/9AT uniquely balances high-energy surge capability (1500 W), compact SMT compatibility, and automotive-grade process readiness - making it optimal for new designs targeting AEC-Q101 compliance and dense PCB layouts.
Availability
1.5SMC51CA-E3/9AT is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecommunications infrastructure requiring stable component supply, consistent RoHS compliance, and full traceability across production lots.
Supply support for 1.5SMC51CA-E3/9AT 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 transient suppression in space-constrained surface-mount applications - targeting automotive, industrial, and telecom markets where robustness, repeatability, and qualification readiness are mandatory.
FAQ
What is the clamping voltage of the 1.5SMC51CA-E3/9AT under a 10/1000 µs surge?
The 1.5SMC51CA-E3/9AT exhibits a maximum clamping voltage (VC) of 70.1 V when subjected to its rated peak pulse current of 21.4 A using the standard 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88303 and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the 1.5SMC51CA-E3/9AT suitable for automotive applications?
The 1.5SMC51CA-E3/9AT itself is RoHS-compliant and manufactured to commercial-grade specifications (E3 suffix), but it belongs to the AEC-Q101-qualified 1.5SMC family. Automotive-grade variants such as 1.5SMC51CAHE3_A are available with full qualification documentation. Engineers may use 1.5SMC51CA-E3/9AT in pre-qualification prototyping or non-safety-critical modules, provided final production shifts to HE3/HM3 suffix parts.
How does the bidirectional design of the 1.5SMC51CA-E3/9AT affect circuit layout?
The 1.5SMC51CA-E3/9AT has no polarity marking and functions identically in both directions, simplifying PCB layout for AC-coupled or differential signal lines like RS-485, CAN, or audio paths. Unlike unidirectional TVS diodes, it eliminates orientation errors during placement and avoids the need for dual-device solutions - reducing BOM count and board area while ensuring symmetrical protection.
What is the thermal resistance of the 1.5SMC51CA-E3/9AT, and how does it impact power handling?
The 1.5SMC51CA-E3/9AT has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W and junction-to-ambient (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads. These values directly govern steady-state power dissipation (6.5 W at TA = 50 °C) and transient thermal response - underscoring the necessity of adequate pad copper area to sustain repetitive surge events without exceeding 150 °C junction temperature.
Does the 1.5SMC51CA-E3/9AT meet UL safety standards?
Yes - the 1.5SMC51CA-E3/9AT carries Underwriters Laboratories recognition under file E136766 for both unidirectional and bidirectional configurations, complying with UL 497B for protectors. This certification validates its suitability for use in primary and secondary circuit protection across consumer, industrial, and telecom end-equipment where regulatory safety approval is required.
1.5SMC51CA-E3/9AT 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-E3/9AT FAQ
1.How can I place an order for 1.5SMC51CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC51CA-E3/9AT 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-E3/9AT reliable?
The price and inventory of 1.5SMC51CA-E3/9AT 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-E3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC51CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC51CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC51CA-E3/9AT?
1.5SMC51CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC51CA-E3/9AT 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-E3/9AT?
For technical support, including 1.5SMC51CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC51CA-E3/9AT requirements.
6.How does Aetrix verify that 1.5SMC51CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC51CA-E3/9AT 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-E3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC51CA-E3/9AT?
All 1.5SMC51CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC51CA-E3/9AT, 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-E3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC51CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC51CA-E3/9AT Tags
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