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Vishay General Semiconductor - Diodes Division 1.5SMC51AHE3/9AT
- Part No.:
- 1.5SMC51AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC51AHE3/9AT.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:3,466
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Product details
Overview
1.5SMC51AHE3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 51 V breakdown voltage (VBR = 48.5–53.6 V at 1 mA), 43.6 V stand-off voltage (VWM), and 70.1 V maximum clamping voltage (VC) at 21.4 A peak pulse current. It delivers 1500 W peak pulse power (10/1000 μs waveform), operates from −65 °C to +150 °C, and is AEC-Q101 qualified for automotive applications.
For engineers reviewing the 1.5SMC51AHE3/9AT datasheet, 1.5SMC51AHE3/9AT pinout, 1.5SMC51AHE3/9AT application, or 1.5SMC51AHE3/9AT equivalent, this device serves as a robust, RoHS-compliant, matte-tin-plated TVS for protecting sensitive ICs, MOSFETs, and sensor signal lines against lightning-induced transients and inductive switching surges in automotive, industrial, and telecom systems.
Technical Context
The 1.5SMC51AHE3/9AT employs a glass-passivated silicon junction optimized for fast response (<1 ps typical) and low incremental surge resistance, enabling precise clamping during transient events. Its unidirectional polarity features a cathode band marking and supports repetitive surge duty cycles up to 0.01 %.
Thermally, it exhibits RθJA = 75 °C/W (junction-to-ambient, on recommended 8.0 mm × 8.0 mm copper pads) and RθJL = 15 °C/W (junction-to-leads), allowing reliable operation under sustained 6.5 W power dissipation at 50 °C ambient. It meets MSL Level 1 per J-STD-020 with 260 °C reflow peak temperature tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V at 1 mA - defines precise reverse breakdown threshold for reliable overvoltage triggering |
| VWM | 43.6 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA |
| VC @ IPPM | 70.1 V at 21.4 A - clamping voltage limiting protected circuit stress during 1500 W transient |
| PPPM | 1500 W (10/1000 μs waveform) - peak surge energy handling capacity for lightning and ESD immunity |
| IFSM | 200 A (8.3 ms half-sine) - forward surge rating confirming robustness against inrush or fault currents |
| TJ max | +150 °C - enables deployment in under-hood automotive and high-temperature industrial environments |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential rail in unidirectional TVS configuration |
| Cathode (marked with band) | Reverse-biased clamping terminal | Connected to protected line (e.g., CAN_H, USB_VBUS, sensor output); conducts during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables single-device protection against IEC 61000-4-5 Level 4 (4 kV surge) without cascading components |
| Glass-passivated junction | Ensures stable VBR and low leakage (<1 μA at VWM) across temperature and lifetime |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body electronics, and ADAS sensor interfaces |
| MSL Level 1 moisture sensitivity | Allows direct placement into standard SMT reflow without baking, reducing manufacturing overhead |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage overshoot on protected ICs, preserving signal integrity and latch-up margin |
Applications
| Automotive Power Supply Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-supplied ECUs from load dump (ISO 16750-2) and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND, clamping surges above 43.6 V. Use Value: Withstands 1500 W pulses and maintains <1 μA leakage at 43.6 V, preventing false resets and ensuring ASIL-B functional safety compliance. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors in PLC modules from field-wiring induced surges. IC Role / Device Role / Timing Role: TVS connected across sensor output and ground, activated within <1 ps to limit voltage to ≤70.1 V. Use Value: Low VC and 21.4 A IPPM ensure downstream op-amps and ADCs remain undamaged during 1 kV/500 A transients. |
| Telecom Interface Protection | Consumer Device USB Port Protection |
|
Use Scenario: Safeguarding RS-485 transceivers in base station backhaul links exposed to lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Paired unidirectional TVS devices on A/B lines referenced to GND, leveraging 70.1 V clamping. Use Value: AEC-Q101 qualification and 1500 W rating meet Telcordia GR-1089-CORE requirements for outdoor telecom equipment. |
Use Scenario: Adding secondary overvoltage protection on USB VBUS lines in smart home hubs after primary fuse and polyfuse. IC Role / Device Role / Timing Role: Clamping diode between VBUS and GND, triggered only during >43.6 V faults (e.g., charger misconnection). Use Value: 43.6 V VWM avoids interference with 5 V ±5 % USB spec while clamping to 70.1 V to protect USB controller ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A-E3/52T | Same VBR range (48.5–53.6 V) but SMB package (DO-214AA); lower PPPM = 600 W | Limited to lower-energy surges (IEC 61000-4-5 Level 2); unsuitable for automotive load dump | Select when board space is constrained and surge threat level is moderate (e.g., indoor consumer ports) |
| 1.5KE51A | Through-hole DO-201AE package; identical electrical specs but no AEC-Q101 qualification or MSL Level 1 rating | Not suitable for automated SMT assembly or automotive under-hood use; requires wave soldering | Choose only for legacy through-hole designs or cost-sensitive non-automotive industrial controls |
Compared with SMBJ51A-E3/52T and 1.5KE51A, the 1.5SMC51AHE3/9AT uniquely combines AEC-Q101 qualification, 1500 W surge rating, SMC surface-mount compatibility, and MSL Level 1 process readiness-making it the only option qualified for high-reliability automotive and automated industrial production.
Availability
1.5SMC51AHE3/9AT is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom interface modules, and consumer USB power delivery systems requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant surge protection.
Supply support for 1.5SMC51AHE3/9AT 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, 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 harsh environments-targeting automotive, industrial, and telecom systems where compact size, high surge capability, and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of the 1.5SMC51AHE3/9AT at its rated peak pulse current?
The 1.5SMC51AHE3/9AT has a maximum clamping voltage (VC) of 70.1 V at its rated peak pulse current (IPPM) of 21.4 A, measured using the standard 10/1000 μs double-exponential waveform. This value ensures protected circuits experience minimal overvoltage stress during transient events, directly supporting design margins for 5 V, 12 V, and 24 V systems.
Is the 1.5SMC51AHE3/9AT suitable for automotive applications?
Yes, the 1.5SMC51AHE3/9AT is AEC-Q101 qualified and carries the "HE3" suffix denoting RoHS-compliant, automotive-grade construction. It is specifically validated for under-hood and body electronics applications-including engine control units, ADAS camera modules, and infotainment power supplies-where temperature cycling, humidity resistance, and surge immunity are critical.
What does the "9AT" suffix indicate in 1.5SMC51AHE3/9AT?
The "9AT" suffix denotes packaging: 13-inch diameter plastic tape and reel with 3500 units per reel. This format supports high-volume automated SMT placement and is compatible with industry-standard pick-and-place equipment, distinguishing it from the "57T" variant (7-inch reel, 850 units).
How does the 1.5SMC51AHE3/9AT differ from bidirectional TVS diodes like 1.5SMC51CA?
The 1.5SMC51AHE3/9AT is unidirectional and features a cathode band marking; it conducts only in reverse bias above VBR. In contrast, 1.5SMC51CA is bidirectional with symmetrical clamping in both polarities and no polarity marking. Use 1.5SMC51AHE3/9AT for DC power rail protection and 1.5SMC51CA for AC-coupled or differential signal lines like RS-485.
What is the thermal resistance of the 1.5SMC51AHE3/9AT, and how does it affect PCB layout?
The 1.5SMC51AHE3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To maintain safe junction temperatures under 6.5 W continuous dissipation, designers must provide adequate copper area and avoid excessive trace length-especially for the cathode connection, which carries surge current.
1.5SMC51AHE3/9AT 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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
1.5SMC51AHE3/9AT FAQ
1.How can I place an order for 1.5SMC51AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC51AHE3/9AT 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 1.5SMC51AHE3/9AT reliable?
The price and inventory of 1.5SMC51AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC51AHE3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC51AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC51AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC51AHE3/9AT?
1.5SMC51AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC51AHE3/9AT 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 1.5SMC51AHE3/9AT?
For technical support, including 1.5SMC51AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC51AHE3/9AT requirements.
6.How does Aetrix verify that 1.5SMC51AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC51AHE3/9AT 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 1.5SMC51AHE3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC51AHE3/9AT?
All 1.5SMC51AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC51AHE3/9AT, 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 1.5SMC51AHE3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC51AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC51AHE3/9AT Tags
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