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Vishay General Semiconductor - Diodes Division 1.5KE51-E3/73
- Part No.:
- 1.5KE51-E3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE51-E3/73.pdf
- Description:
- TVS DIODE 41.3VWM 73.5VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:9,986
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Product details
Overview
1.5KE51-E3/73 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection in power rails and signal lines. It features a 48.5 V to 53.6 V breakdown voltage (VBR) at 1 mA, 43.6 V standoff voltage (VWM), 70.1 V clamping voltage (VC) at 21.4 A peak pulse current, and 1500 W peak pulse power rating with a 10/1000 µs waveform - used to safeguard MOSFETs, ICs, and sensor interfaces against lightning-induced surges and inductive switching transients.
For engineers reviewing the 1.5KE51-E3/73 datasheet, 1.5KE51-E3/73 pinout, 1.5KE51-E3/73 application, or 1.5KE51-E3/73 equivalent, this part delivers verified transient suppression performance in commercial-grade, through-hole mounted designs requiring robust ESD and surge immunity per IEC 61000-4-2/4-5, with RoHS-compliant matte tin-plated leads and UL 94 V-0 molded epoxy packaging.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches into low-impedance conduction to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at VWM), while the 10/1000 µs waveform rating reflects standardized surge immunity testing per R.E.A. and IEC standards.
Thermal design is supported by a junction-to-lead thermal resistance of 15.4 °C/W and maximum operating junction temperature of +175 °C. The device exhibits a temperature coefficient of VBR of +0.102 %/°C, enabling predictable voltage drift across industrial temperature ranges without external compensation.
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 reliable overvoltage triggering |
| VWM | 43.6 V - maximum continuous reverse working voltage before leakage rises above 1 µA |
| VC @ IPPM | 70.1 V at 21.4 A - clamping voltage during full 1500 W surge, limiting stress on protected ICs |
| PPPM | 1500 W - peak pulse power handling capability with 10/1000 µs waveform, validated for lightning surge immunity |
| IFSM | 200 A - non-repetitive forward surge current rating (8.3 ms half-sine), supporting high-energy transient events |
| TJ max. | +175 °C - enables operation in under-hood automotive and industrial power supply environments |
| RθJL | 15.4 °C/W - low junction-to-lead thermal resistance supports reliable heat dissipation without heatsink |
Pinout & Package
Package: Case Style 1.5KE - axial-leaded, molded epoxy body meeting UL 94 V-0 flammability rating; leads are matte tin plated, solderable per J-STD-002 and JESD 22-B102; E3 suffix indicates RoHS compliance and JESD 201 Class 1A whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode | Avalanche clamping terminal | Marked with color band; connected to protected line (e.g., 48 V rail or signal input) to clamp overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress |
| 1500 W peak pulse power (10/1000 µs) | Validated for IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-earth) in properly filtered systems |
| Clamping ratio (VC/VBR) ≈ 1.45 | Low incremental surge resistance enables tighter voltage control during fast transients |
| Response time ≤ 1 ns | Faster than MOVs or GDTs - protects sensitive CMOS inputs before damage occurs |
| Operating TJ range: –55 °C to +175 °C | Supports deployment in engine control units, industrial motor drives, and outdoor telecom equipment |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate drivers and microcontroller I/O pins from inductive kickback during relay or solenoid switching in PLCs and VFDs. IC Role / Device Role / Timing Role: Shunt clamping element placed directly across DC bus or signal line to limit transient voltage to safe levels within nanoseconds. Use Value: Prevents latch-up and permanent damage to 3.3 V/5 V logic interfaces exposed to >100 V switching spikes in 24 V control systems. |
Use Scenario: Input protection for LIN bus transceivers and sensor signal conditioning circuits in door modules and lighting controllers. IC Role / Device Role / Timing Role: Unidirectional TVS connected between LIN line and ground to suppress load dump and ISO 7637-2 Pulse 1/2a transients. Use Value: Maintains signal integrity below 70 V clamping level while surviving repetitive 1500 W surges per AEC-Q101 qualification requirements. |
| Telecom Power Supplies | Consumer Appliance Control Boards |
Use Scenario: Secondary-side overvoltage protection on +48 V DC distribution rails feeding PoE injectors and remote radio units. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after DC-DC converter output to clamp surges induced by cable coupling or hot-plug events. Use Value: Limits voltage excursion to 70.1 V during 10/1000 µs surges, preventing overstress of downstream 50 V-rated capacitors and regulators. |
Use Scenario: Surge protection for microcontroller reset lines and front-panel button inputs in washing machines and HVAC controllers. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA at 43.6 V) TVS placed between MCU pin and chassis ground to absorb ESD and contact discharge. Use Value: Enables CE-compliant EN 61000-4-2 (±8 kV contact) immunity without degrading standby current or causing false resets. |
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 | Surface-mount SMB package (vs. axial 1.5KE); same VBR range (48.5–53.6 V), but lower PPPM = 600 W | Used where PCB space is constrained and surge energy is limited to <600 W (e.g., low-power IoT nodes) | Select SMBJ51A only if layout allows SMT placement and system-level surge testing confirms 600 W sufficiency. |
| 1.5KE51A-E3/54 | Same die and electrical specs; differs only in packaging - 54-tape-and-reel vs. 73-bulk packaging format | No functional difference; choice depends solely on production assembly method (auto-placement vs. manual/hand-solder) | Choose 1.5KE51A-E3/54 for automated pick-and-place; 1.5KE51-E3/73 remains optimal for prototyping and low-volume hand assembly. |
Compared with SMBJ51A, the 1.5KE51-E3/73 provides 2.5× higher surge power handling and superior thermal dissipation via axial leads, making it suitable for high-energy industrial transients; versus 1.5KE51A-E3/54, it offers identical protection performance with optimized packaging for manual or selective soldering workflows.
Availability
1.5KE51-E3/73 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body electronics, telecom power supplies, and consumer appliance control boards requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1.5KE51-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, 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 industrial automation, transportation, and infrastructure applications where failure resilience is critical.
FAQ
What is the exact breakdown voltage range for 1.5KE51-E3/73?
The 1.5KE51-E3/73 has a guaranteed breakdown voltage (VBR) range of 48.5 V to 53.6 V at a test current of 1 mA, as specified in Vishay's official datasheet document 88301. This tolerance ensures consistent clamping behavior across production lots and supports reliable overvoltage detection in 48 V system designs. The 1.5KE51-E3/73 maintains this specification under standard test conditions (TA = 25 °C).
Is 1.5KE51-E3/73 RoHS compliant and lead-free?
Yes, the 1.5KE51-E3/73 carries the "E3" suffix, which explicitly denotes RoHS compliance per EU Directive 2011/65/EU and JESD 201 Class 1A whisker resistance. Its matte tin-plated leads meet J-STD-002 solderability requirements, and the molded epoxy case complies with UL 94 V-0. No lead or other restricted substances exceed threshold limits defined in Vishay's material declaration.
Can 1.5KE51-E3/73 be used in bidirectional configurations?
No - the 1.5KE51-E3/73 is a unidirectional TVS diode, identified by the "A" suffix (not "CA"). Bidirectional variants such as 1.5KE51CA exist but are electrically and mechanically distinct. Using 1.5KE51-E3/73 in bidirectional applications would result in forward conduction during negative transients, potentially damaging the device or failing to protect the circuit.
What is the maximum clamping voltage of 1.5KE51-E3/73 under surge conditions?
The maximum clamping voltage (VC) of the 1.5KE51-E3/73 is 70.1 V at a peak pulse current (IPPM) of 21.4 A, measured with a 10/1000 µs waveform. This value represents the upper bound of voltage seen by protected components during worst-case surge events and is critical for ensuring downstream ICs rated for ≤75 V remain within safe operating limits.
Does 1.5KE51-E3/73 meet AEC-Q101 qualification?
No - the 1.5KE51-E3/73 is a commercial-grade part (E3 suffix). AEC-Q101 qualified versions carry the "HE3" suffix (e.g., 1.5KE51AHE3_B). While the 1.5KE51-E3/73 shares the same silicon die and core electrical specs, it lacks the extended stress testing and lot traceability required for automotive under-hood applications per AEC-Q101 Rev D.
1.5KE51-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:
- 1
- Bidirectional Channels:
- -
- 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
1.5KE51-E3/73 FAQ
1.How can I place an order for 1.5KE51-E3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE51-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 1.5KE51-E3/73 reliable?
The price and inventory of 1.5KE51-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 1.5KE51-E3/73 is usually 5 days.
3.What payment methods are accepted for 1.5KE51-E3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE51-E3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE51-E3/73?
1.5KE51-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE51-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 1.5KE51-E3/73?
For technical support, including 1.5KE51-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE51-E3/73 requirements.
6.How does Aetrix verify that 1.5KE51-E3/73 is sourced from the original manufacturer or authorized distributors?
All 1.5KE51-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 1.5KE51-E3/73 meets industry standards.
7.What is the process for return or replacement of 1.5KE51-E3/73?
All 1.5KE51-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE51-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 1.5KE51-E3/73 part is unused and in its original packaging.
Return procedure for 1.5KE51-E3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE51-E3/73 Tags
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