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Vishay General Semiconductor - Diodes Division 1.5KE51C-E3/73
- Part No.:
- 1.5KE51C-E3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE51C-E3/73.pdf
- Description:
- TVS DIODE 41.3VWM 73.5VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:7,371
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Product details
Overview
1.5KE51C-E3/73 from Vishay General Semiconductor is a bidirectional 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), 1500 W peak pulse power (10/1000 µs), clamping voltage of 70.1 V at 21.4 A, and operates across –55 °C to +175 °C. It is used to protect MOSFETs, ICs, and sensor interfaces against lightning-induced surges and inductive switching transients in industrial and automotive systems.
For engineers reviewing the 1.5KE51C-E3/73 datasheet, 1.5KE51C-E3/73 pinout, 1.5KE51C-E3/73 application, or 1.5KE51C-E3/73 equivalent, this device delivers verified bidirectional clamping performance with UL 94 V-0 molded epoxy packaging, RoHS-compliant matte tin leads, and JESD 201 Class 1A whisker resistance - critical for high-reliability board-level surge protection design.
Technical Context
This TVS diode employs a glass-passivated silicon junction optimized for sub-nanosecond response (<1 ns), enabling effective suppression of fast-rising transients such as ESD and lightning surges. Its bidirectional architecture provides symmetrical clamping in both polarities without polarity marking, supporting AC-coupled or floating signal line protection.
It is rated for 1500 W peak pulse power under 10/1000 µs waveform with 0.01% duty cycle, and exhibits low incremental surge resistance - key for minimizing let-through voltage during high-current events. Thermal resistance is specified at RθJA = 75 °C/W and RθJL = 15.4 °C/W, confirming suitability for lead-mounted PCB applications without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V at 1 mA - defines precise clamping onset threshold for bidirectional surge events |
| VC @ IPPM | 70.1 V at 21.4 A - maximum let-through voltage during full-rated 1500 W transient |
| PPPM | 1500 W (10/1000 µs) - enables protection against severe lightning and load-dump surges |
| VWM | 43.6 V - maximum continuous working voltage before leakage exceeds 1 µA |
| ID @ VWM | ≤1 µA - ensures negligible standby power loss and no interference with normal circuit operation |
| TJ range | –55 °C to +175 °C - supports deployment in under-hood automotive and industrial environments |
| Package | Case Style 1.5KE - axial-leaded DO-201AD package with 0.375" (9.5 mm) lead length, UL 94 V-0 compliant |
Pinout & Package
1.5KE51C-E3/73 uses the standard DO-201AD axial package (Case Style 1.5KE), with unmarked leads indicating bidirectional symmetry - no cathode/anode designation. Leads are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, and qualified to JESD 201 Class 1A for whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional current path | Either lead serves as input/output - enables placement across AC lines or floating nodes without orientation concern |
| Leads (2) | Thermal and electrical interface | 0.375" (9.5 mm) length optimized for through-hole mounting; RθJL = 15.4 °C/W enables direct heat conduction to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| 1500 W peak pulse rating | Withstands IEC 61000-4-5 Level 4 (4 kV) surges without degradation when properly mounted |
| Sub-1 ns response time | Clamps transients before sensitive downstream components experience damaging overvoltage |
| UL 94 V-0 epoxy molding | Provides flame-retardant mechanical encapsulation essential for industrial and automotive safety compliance |
| RoHS-compliant & JESD 201 Class 1A | Meets environmental regulations and mitigates tin whisker risk in high-reliability long-life deployments |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protecting gate drivers and current-sense amplifiers from inductive kickback during relay or solenoid switching in PLCs and VFDs. IC Role / Device Role: Bidirectional clamping element placed across DC bus or signal inputs to limit transient excursions to safe levels. Use Value: Prevents latch-up or permanent damage to 5 V/12 V logic interfaces and MOSFET gate oxides during repetitive 100–500 V switching spikes. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins against battery dump and load-switching noise in door modules and lighting ECUs. IC Role / Device Role: Primary surge suppressor on 12 V supply rails and bidirectional data lines, operating within AEC-Q101-qualified environment. Use Value: Maintains system uptime by absorbing 1500 W transients while holding clamped voltage below 70.1 V - well below 80 V ABS MAX ratings of common automotive ICs. |
| Telecom Power Feeds | Consumer Sensor Hubs |
Use Scenario: Shielding PoE-powered Ethernet ports and AC/DC adapter outputs from lightning-induced surges on outdoor cabling. IC Role / Device Role: First-line defense on primary-side DC rails and secondary-side isolated interfaces in telecom power supplies. Use Value: Delivers repeatable 1500 W clamping performance with <1 µA leakage at 43.6 V, preserving efficiency and meeting IEC 61000-4-5 surge immunity requirements. |
Use Scenario: Securing I²C and analog sensor inputs (e.g., temperature, motion) in smart home hubs exposed to ESD and EFT events. IC Role / Device Role: Low-capacitance (typ. <100 pF), fast-response TVS placed directly at connector entry points. Use Value: Clamps 8 kV contact ESD pulses to <70.1 V within nanoseconds - preventing data corruption and reset events in 3.3 V microcontroller peripherals. |
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 | DO-214AA package (SMB), 600 W PPPM, same VBR (48.5–53.6 V), lower IPPM (32.4 A) | Surface-mount only; lower power handling limits use to moderate-surge environments | Select when space-constrained PCB layout requires SMT and surge threat level is ≤600 W |
| 1.5KE51A-E3/73 | Unidirectional version; identical VBR, VC, and PPPM, but marked cathode band and asymmetric clamping | Requires correct polarity orientation; unsuitable for AC or floating nodes | Choose only for DC rail protection where polarity is fixed and reverse conduction must be blocked |
Compared with 1.5KE51C-E3/73, SMBJ51CA offers compact SMT integration at reduced surge capacity, while 1.5KE51A-E3/73 trades bidirectional flexibility for unidirectional blocking - making the C-suffix version uniquely suited for universal placement across AC-coupled, differential, or floating signal paths without orientation constraints.
Availability
1.5KE51C-E3/73 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power feeds, and consumer sensor hubs requiring stable component supply and long-lifecycle support.
Supply support for 1.5KE51C-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 high-reliability diodes, MOSFETs, and passive components for demanding industrial, automotive, and computing applications.
The 1.5KE series was engineered specifically for high-energy transient suppression in harsh environments - delivering consistent 1500 W clamping performance with extended temperature range and robust packaging for mission-critical protection.
FAQ
What does the "C" suffix in 1.5KE51C-E3/73 indicate?
The "C" suffix in 1.5KE51C-E3/73 denotes bidirectional configuration - meaning the device clamps symmetrically in both polarities, with no cathode marking and identical VBR and VC characteristics for positive and negative transients. This makes 1.5KE51C-E3/73 ideal for AC lines, differential signals, or any floating node where polarity cannot be guaranteed during surge events.
Is 1.5KE51C-E3/73 RoHS compliant and lead-free?
Yes, 1.5KE51C-E3/73 is RoHS compliant and lead-free. The "E3" suffix confirms compliance with EU RoHS Directive 2011/65/EU, and its matte tin-plated leads meet J-STD-002 solderability standards. It also passes JESD 201 Class 1A whisker testing, ensuring reliability in long-life applications without tin whisker growth risk.
What is the maximum clamping voltage of 1.5KE51C-E3/73 under full-rated surge current?
The maximum clamping voltage (VC) of 1.5KE51C-E3/73 is 70.1 V at 21.4 A peak pulse current (IPPM), measured under the standardized 10/1000 µs waveform. This value represents the highest voltage that will appear across protected circuitry during a full 1500 W transient event - a critical parameter for verifying compatibility with downstream IC absolute maximum ratings.
Can 1.5KE51C-E3/73 be used in automotive applications?
Yes, 1.5KE51C-E3/73 is suitable for automotive applications, particularly in non-safety-critical modules like body control units and infotainment power rails. While the base 1.5KE51C-E3/73 is commercial-grade, AEC-Q101-qualified variants (e.g., 1.5KE51C-HE3_B) exist in the same family - verify part number suffix and qualification status per design requirements before deployment in automotive systems.
How does the thermal resistance of 1.5KE51C-E3/73 affect PCB layout?
1.5KE51C-E3/73 has RθJL = 15.4 °C/W (junction-to-lead) and RθJA = 75 °C/W (junction-to-ambient), indicating efficient heat transfer through its axial leads. For optimal thermal performance, mount with ≥9.5 mm lead length and connect leads to ≥1 cm² copper pour - avoiding excessive trace length or narrow traces that impede conduction. No heatsink is required for single-event surge duty.
1.5KE51C-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 41.3V
- Voltage - Breakdown (Min):
- 45.9V
- Voltage - Clamping (Max) @ Ipp:
- 73.5V
- Current - Peak Pulse (10/1000µs):
- 20.4A
- 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
1.5KE51C-E3/73 FAQ
1.How can I place an order for 1.5KE51C-E3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE51C-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 1.5KE51C-E3/73 reliable?
The price and inventory of 1.5KE51C-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 1.5KE51C-E3/73 is usually 5 days.
3.What payment methods are accepted for 1.5KE51C-E3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE51C-E3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE51C-E3/73?
1.5KE51C-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE51C-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 1.5KE51C-E3/73?
For technical support, including 1.5KE51C-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE51C-E3/73 requirements.
6.How does Aetrix verify that 1.5KE51C-E3/73 is sourced from the original manufacturer or authorized distributors?
All 1.5KE51C-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 1.5KE51C-E3/73 meets industry standards.
7.What is the process for return or replacement of 1.5KE51C-E3/73?
All 1.5KE51C-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE51C-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 1.5KE51C-E3/73 part is unused and in its original packaging.
Return procedure for 1.5KE51C-E3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE51C-E3/73 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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