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Vishay General Semiconductor - Diodes Division 1.5KE27-E3/73
- Part No.:
- 1.5KE27-E3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE27-E3/73.pdf
- Description:
- TVS DIODE 21.8VWM 39.1VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:8,185
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Product details
Overview
1.5KE27-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 25.7 V to 28.4 V breakdown voltage (VBR) at 1 mA, 23.1 V maximum standoff voltage (VWM), 37.5 V clamping voltage (VC) at 40.0 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - used to safeguard MOSFETs, ICs, and sensor interfaces against lightning-induced transients and inductive switching surges.
For engineers reviewing the 1.5KE27-E3/73 datasheet, 1.5KE27-E3/73 pinout, 1.5KE27-E3/73 application, or 1.5KE27-E3/73 equivalent, this device delivers verified clamping performance, RoHS-compliant matte tin-plated leads, JEDEC-standard Case Style 1.5KE packaging, and thermal robustness up to 175 °C junction temperature - critical for automotive, industrial power supply, and telecom interface protection design.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when transient voltage exceeds VBR, it avalanches into low-impedance conduction, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance.
It responds in <1 ns to transients and sustains 200 A non-repetitive forward surge current (IFSM) per 8.3 ms half-sine wave. Thermal resistance is 15.4 °C/W (junction-to-lead), enabling effective heat dissipation through PCB copper pours or lead-frame conduction without external heatsinking under typical surge duty cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 25.7 V / 28.4 V at 1 mA - defines precise avalanche initiation threshold for reliable overvoltage detection |
| VWM | 23.1 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VC @ IPPM | 37.5 V at 40.0 A - clamped voltage during 10/1000 µs surge, limiting stress on protected ICs |
| PPPM | 1500 W - peak transient power handling capability, sufficient for IEC 61000-4-5 Level 4 surges |
| IFSM | 200 A - single-pulse forward surge rating, supporting high-energy inductive load switching events |
| TJ max | 175 °C - enables operation in under-hood automotive or industrial ambient environments |
| Package | Case Style 1.5KE - axial-leaded DO-201AD package, 0.375" lead length, UL 94 V-0 molded epoxy body |
Pinout & Package
1.5KE27-E3/73 uses the standard DO-201AD (Case Style 1.5KE) axial-leaded package. The cathode is marked by a color band on the body; polarity must be observed during PCB placement to ensure correct shunt clamping direction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or lowest potential rail; completes clamping path during reverse transient |
| Cathode | High-side transient input node | Connected to protected line (e.g., 24 V rail or RS-485 bus); avalanche conduction initiates here |
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 power (10/1000 µs) | Supports robust protection against IEC 61000-4-5 combination wave surges without derating at 25 °C |
| Clamping ratio (VC/VBR) ≈ 1.42 | Indicates efficient low-voltage overshoot control - critical for 3.3 V/5 V logic-level IC protection |
| Response time < 1 ns | Enables protection of fast-switching MOSFET gates and high-speed data lines before damage occurs |
| RoHS-compliant matte tin plating | Meets J-STD-002 solderability requirements and JESD 201 Class 1A whisker resistance |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 24 V digital input channels from relay coil flyback and ESD events in factory automation cabinets. IC Role / Device Role / Timing Role: Shunt clamping element placed between field input and optocoupler input, conducting only during transients >23.1 V. Use Value: Limits voltage seen by optocoupler LED to ≤37.5 V, preventing premature degradation and ensuring >100,000-cycle reliability. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller GPIOs from load dump and jump-start surges in vehicle door modules. IC Role / Device Role / Timing Role: Unidirectional TVS connected from LIN line to chassis ground, clamping negative transients and positive spikes above VWM. Use Value: Withstands 200 A surge pulses and maintains clamping below 40 V - preserving signal integrity and avoiding bus lockup. |
| Telecom Power Supply Input | Consumer Appliance Motor Drive |
Use Scenario: Secondary-side DC input protection for PoE-powered network switches exposed to induced lightning surges on Ethernet cabling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 48 V DC input rail upstream of DC/DC converters and PHY ICs. Use Value: 1500 W rating absorbs full IEC 61000-4-5 2 Ω/12 Ω surge energy; 37.5 V clamping prevents converter latch-up. |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in smart vacuum cleaners and power tools. IC Role / Device Role / Timing Role: Mounted across motor terminals to clamp inductive kickback during PWM commutation. Use Value: Fast <1 ns response captures initial voltage spike; 200 A IFSM handles repeated 10–50 ms motor stall currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A | DO-214AA package (SMB), 24 V VWM, 38.9 V VC @ 38.8 A, 600 W PPPM | Lower power rating and surface-mount format - suited for space-constrained PCBs but requires layout revision | Select SMBJ24A only if board area is limited and surge energy is ≤600 W; verify thermal relief for SMB footprint. |
| 1.5KE27A-E3/54 | Same electrical specs and DO-201AD package; differs only in tape-and-reel packaging (1400 pcs/reel vs. 750 pcs/reel for /73) | No functional or application difference - identical protection performance and mounting | Choose 1.5KE27A-E3/54 for high-volume automated assembly; 1.5KE27-E3/73 suits lower-batch prototyping or repair stock. |
Compared with SMBJ24A, 1.5KE27-E3/73 provides 2.5× higher surge power margin and axial-leaded ease of manual replacement; versus 1.5KE27A-E3/54, it offers identical protection with optimized reel quantity for mid-volume builds - making it ideal for industrial field-service and mixed-production scenarios.
Availability
1.5KE27-E3/73 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive BCM circuits, and telecom power supply input stages requiring stable component supply, long-lifecycle support, and traceable RoHS-compliant sourcing.
Supply support for 1.5KE27-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, precision, and automotive-grade qualification.
The 1.5KE series was engineered for high-energy transient suppression in harsh environments - targeting industrial controls, automotive subsystems, and infrastructure equipment where failure resilience is mission-critical.
FAQ
What is the breakdown voltage range of the 1.5KE27-E3/73?
The 1.5KE27-E3/73 has a guaranteed breakdown voltage (VBR) range of 25.7 V to 28.4 V at a test current of 1 mA, measured per JEDEC standard. This tight tolerance ensures consistent clamping behavior across production lots and supports precise overvoltage threshold design in 24 V systems where margin above nominal rail is critical.
Is the 1.5KE27-E3/73 suitable for automotive applications?
Yes - the 1.5KE27-E3/73 meets commercial-grade specifications and is widely deployed in non-safety-critical automotive subsystems such as body control modules and infotainment power supplies. While not AEC-Q101 qualified itself, its 175 °C max junction temperature and robust surge ratings align with under-dash environmental demands; for Q101 compliance, specify 1.5KE27AHE3_B instead.
How does the clamping voltage of 1.5KE27-E3/73 compare to its standoff voltage?
The 1.5KE27-E3/73 has a maximum standoff voltage (VWM) of 23.1 V and a clamping voltage (VC) of 37.5 V at 40.0 A. This 14.4 V differential represents the controlled voltage overshoot during surge events - a key design parameter that determines whether downstream components like 3.3 V or 5 V logic remain within absolute maximum ratings.
Can the 1.5KE27-E3/73 be used in bidirectional configurations?
No - the 1.5KE27-E3/73 is a unidirectional TVS diode, identifiable by its cathode band marking. Bidirectional variants require the "CA" suffix (e.g., 1.5KE27CA). Using 1.5KE27-E3/73 in AC or symmetrical transient environments would leave one polarity unprotected; always match polarity type to system grounding and signal swing requirements.
What is the thermal resistance profile of the 1.5KE27-E3/73?
The 1.5KE27-E3/73 has a typical junction-to-lead thermal resistance (RθJL) of 15.4 °C/W and junction-to-ambient (RθJA) of 75 °C/W. In practice, this means that with 1.5KE27-E3/73 mounted on a standard FR-4 PCB with 1 oz copper and moderate copper pour, it can dissipate short-duration surges without exceeding 175 °C junction temperature - no heatsink required for typical IEC 61000-4-5 events.
1.5KE27-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):
- 21.8V
- Voltage - Breakdown (Min):
- 24.3V
- Voltage - Clamping (Max) @ Ipp:
- 39.1V
- Current - Peak Pulse (10/1000µs):
- 38.4A
- 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
1.5KE27-E3/73 FAQ
1.How can I place an order for 1.5KE27-E3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE27-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 1.5KE27-E3/73 reliable?
The price and inventory of 1.5KE27-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 1.5KE27-E3/73 is usually 5 days.
3.What payment methods are accepted for 1.5KE27-E3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE27-E3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE27-E3/73?
1.5KE27-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE27-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 1.5KE27-E3/73?
For technical support, including 1.5KE27-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE27-E3/73 requirements.
6.How does Aetrix verify that 1.5KE27-E3/73 is sourced from the original manufacturer or authorized distributors?
All 1.5KE27-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 1.5KE27-E3/73 meets industry standards.
7.What is the process for return or replacement of 1.5KE27-E3/73?
All 1.5KE27-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE27-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 1.5KE27-E3/73 part is unused and in its original packaging.
Return procedure for 1.5KE27-E3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE27-E3/73 Tags
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