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Vishay General Semiconductor - Diodes Division 1.5KE51A-E3/73
- Part No.:
- 1.5KE51A-E3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE51A-E3/73.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:6,851
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Product details
Overview
1.5KE51A-E3/73 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 48.5 V minimum breakdown voltage (VBR), 43.6 V maximum standoff voltage (VWM), 70.1 V clamping voltage (VC) at 21.4 A peak pulse current, 1500 W peak pulse power rating (10/1000 µs), and operates across –55 °C to +175 °C junction temperature range.
For engineers reviewing the 1.5KE51A-E3/73 datasheet, 1.5KE51A-E3/73 pinout, 1.5KE51A-E3/73 application, or 1.5KE51A-E3/73 equivalent, this device serves as a robust, glass-passivated, RoHS-compliant surge protector for automotive power supplies, industrial sensor interfaces, and telecom line cards where fast clamping (<1 ns), low incremental surge resistance, and AEC-Q101–qualified reliability are required.
Technical Context
This unidirectional TVS diode uses a silicon avalanche junction structure with glass passivation to achieve stable, repeatable breakdown behavior under transient stress. Its 10/1000 µs waveform response delivers 1500 W peak pulse power dissipation while maintaining a tight 48.5–53.6 V VBR window at 1 mA test current and 70.1 V clamping limit at rated IPPM.
The device exhibits a 0.102 %/°C temperature coefficient of VBR, enabling predictable voltage drift over temperature, and supports 200 A non-repetitive forward surge current (8.3 ms half-sine). Its thermal resistance (junction-to-lead) is 15.4 °C/W, supporting reliable operation without heatsinking in moderate-duty-cycle applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V at 1 mA - defines precise avalanche initiation threshold for accurate 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 - clamped voltage during 1500 W transient, limiting downstream component stress |
| PPPM | 1500 W (10/1000 µs) - peak surge energy handling capacity for lightning and inductive switching events |
| IFSM | 200 A (8.3 ms half-sine) - withstands high-current surges without bond-wire failure |
| TJ Range | –55 °C to +175 °C - enables deployment in under-hood automotive, industrial motor drives, and outdoor telecom equipment |
| Package | Case Style 1.5KE - axial-leaded DO-201AD package with matte tin-plated leads, UL 94 V-0 molding compound |
Pinout & Package
1.5KE51A-E3/73 is housed in a DO-201AD (Case Style 1.5KE) axial-leaded package. The cathode is marked by a color band on the body; the anode is the unmarked end. Leads are matte tin-plated and solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry point in forward bias; connected to system ground or low-side reference | Provides low-impedance path to shunt surge current to ground when reverse voltage exceeds VBR |
| Cathode (banded end) | Current exit point in forward bias; connected to protected line or supply rail | Acts as the high-impedance input terminal until clamping threshold is reached; determines polarity of protection |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term stability of VBR and low leakage (<1 μA at VWM) across temperature and lifetime |
| 1500 W peak pulse power (10/1000 µs) | Handles severe transients such as ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 Combination Wave (1.2/50 µs + 8/20 µs) |
| Clamping response time <1 ns | Engages before sensitive ICs (e.g., microcontrollers, CAN transceivers) experience damaging overvoltage |
| RoHS-compliant, commercial-grade E3 suffix | Meets JESD 201 Class 1A whisker resistance and UL 94 V-0 flammability for industrial and consumer PCBs |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for 3.3 V/5 V logic |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump transients up to 120 V and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary clamping element placed between battery rail and DC-DC converter input. Use Value: Limits voltage to ≤70.1 V during 1500 W surges, preventing damage to downstream regulators and MCU power pins. | Use Scenario: Shielding 4–20 mA current-loop transmitters and analog sensor outputs from ESD and field-induced surges. IC Role / Device Role / Timing Role: Unidirectional shunt protector on signal line referenced to local ground. Use Value: Clamps transients within 1 ns while adding <1 pF capacitance, preserving signal integrity in 100 kHz bandwidth systems. |
| Telecom Line Card Surge Protection | Consumer Power Adapter Input Stage |
Use Scenario: Safeguarding AC/DC front-end rectifiers and PFC controllers in outdoor DSLAM and base station power modules. IC Role / Device Role / Timing Role: Secondary overvoltage clamp after MOV, absorbing residual energy not diverted by coarse protection. Use Value: Provides precise 43.6 V standoff and 70.1 V clamping to protect 600 V-rated MOSFETs and bridge rectifiers from repetitive surges. | Use Scenario: Overvoltage suppression on secondary-side 5 V/12 V DC outputs of wall adapters exposed to user-induced plug/unplug transients. IC Role / Device Role / Timing Role: Final-stage TVS on regulated output rail, placed adjacent to connector or USB port. Use Value: Withstands 200 A surge (8.3 ms) and maintains <1 μA leakage at 43.6 V, ensuring no standby power penalty or false trips. |
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 | DO-214AA package; lower 600 W PPPM; 51.0–56.4 V VBR; 8.5 mm × 6.2 mm footprint vs. axial 1.5KE's 5.3 mm diameter | Better suited for space-constrained PCBs; less effective for high-energy load dump events | Select SMBJ51A only if board area is critical and surge energy remains ≤600 W |
| 1.5KE51CA | Bidirectional variant; same VBR range but symmetric clamping in both polarities; requires no polarity awareness during placement | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where reverse polarity surges occur | Choose 1.5KE51CA when protecting bidirectional data lines; 1.5KE51A-E3/73 is optimal for DC rails with defined polarity |
Compared with SMBJ51A and 1.5KE51CA, the 1.5KE51A-E3/73 delivers higher surge robustness (1500 W vs. 600 W) and axial-leaded mechanical reliability for through-hole power applications, while offering tighter VBR tolerance than many SMD alternatives-making it preferred for automotive and industrial DC power protection where energy handling and thermal mass matter.
Availability
1.5KE51A-E3/73 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom infrastructure requiring stable component supply, long-lifecycle support, and traceable RoHS-compliant sourcing.
Supply support for 1.5KE51A-E3/73 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 handling, and automotive qualification.
The 1.5KE series was engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness, thermal stability, and AEC-Q101 compliance are mandatory design requirements.
FAQ
What is the breakdown voltage range of the 1.5KE51A-E3/73?
The 1.5KE51A-E3/73 has a guaranteed breakdown voltage (VBR) range of 48.5 V to 53.6 V at 1 mA test current, measured per JEDEC standard. This tight tolerance ensures consistent clamping behavior across production lots and supports reliable overvoltage detection in 48 V nominal systems. The value is confirmed in Vishay's official datasheet document 88301, revision 09-Aug-2022.
Is the 1.5KE51A-E3/73 RoHS compliant and lead-free?
Yes, the 1.5KE51A-E3/73 carries the "E3" suffix, indicating full RoHS compliance and commercial-grade qualification. Its matte tin-plated leads meet J-STD-002 solderability standards and JESD 201 Class 1A whisker resistance testing. The epoxy molding compound satisfies UL 94 V-0 flammability requirements, and no lead or hazardous substances exceed EU RoHS limits.
What is the maximum clamping voltage of the 1.5KE51A-E3/73 under surge conditions?
The 1.5KE51A-E3/73 clamps to a maximum of 70.1 V when subjected to its rated peak pulse current of 21.4 A (10/1000 µs waveform). This clamping voltage is measured across the device terminals during transient conduction and defines the upper voltage limit imposed on protected circuitry-critical for ensuring compatibility with 60 V-rated MOSFETs and 5 V/12 V system rails.
Can the 1.5KE51A-E3/73 be used in automotive applications?
The 1.5KE51A-E3/73 is qualified for commercial-grade operation from –55 °C to +175 °C and meets key automotive reliability requirements including solder dip endurance (275 °C for 10 s) and JESD 201 whisker resistance. While the E3 suffix denotes commercial grade, AEC-Q101–qualified variants (e.g., 1.5KE51AHE3_B) exist. For production automotive use, confirm qualification status per part number and consult Vishay's automotive product documentation.
How does the 1.5KE51A-E3/73 differ from the bidirectional 1.5KE51CA?
The 1.5KE51A-E3/73 is unidirectional, with a cathode band marking and asymmetric conduction-blocking forward current above ~3.5 V while clamping reverse surges above 48.5 V. In contrast, 1.5KE51CA provides symmetrical clamping in both directions, making it suitable for AC or floating lines. Both share identical VBR, VC, and PPPM, but polarity handling and PCB layout requirements differ fundamentally.
1.5KE51A-E3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Box (TB)
- Product Status:
- Active
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE51A-E3/73 FAQ
1.How can I place an order for 1.5KE51A-E3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE51A-E3/73 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 1.5KE51A-E3/73 reliable?
The price and inventory of 1.5KE51A-E3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE51A-E3/73 is usually 5 days.
3.What payment methods are accepted for 1.5KE51A-E3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE51A-E3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE51A-E3/73?
1.5KE51A-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE51A-E3/73 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 1.5KE51A-E3/73?
For technical support, including 1.5KE51A-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE51A-E3/73 requirements.
6.How does Aetrix verify that 1.5KE51A-E3/73 is sourced from the original manufacturer or authorized distributors?
All 1.5KE51A-E3/73 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 1.5KE51A-E3/73 meets industry standards.
7.What is the process for return or replacement of 1.5KE51A-E3/73?
All 1.5KE51A-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE51A-E3/73, 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 1.5KE51A-E3/73 part is unused and in its original packaging.
Return procedure for 1.5KE51A-E3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE51A-E3/73 Tags
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