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Vishay General Semiconductor - Diodes Division 1.5KE27A-E3/51
- Part No.:
- 1.5KE27A-E3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE27A-E3/51.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:2,363
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Product details
Overview
1.5KE27A-E3/51 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection of DC power rails and signal lines. It features a 25.7 V minimum breakdown voltage (VBR), 23.1 V maximum standoff voltage (VWM), 37.5 V clamping voltage at 40 A peak pulse current, 1500 W peak pulse power rating (10/1000 µs), and operates across -55 °C to +175 °C junction temperature range - used in automotive power supply input stages and industrial sensor interface protection.
For engineers reviewing the 1.5KE27A-E3/51 datasheet, 1.5KE27A-E3/51 pinout, 1.5KE27A-E3/51 application, or 1.5KE27A-E3/51 equivalent, this page delivers verified electrical parameters, JEDEC 1.5KE package dimensions, polarity marking guidance, thermal resistance data (RθJA = 75 °C/W), and direct alternatives with documented clamping and leakage differences.
Technical Context
This unidirectional TVS diode uses a glass-passivated silicon junction to achieve sub-nanosecond response time (<1 ns) and low incremental surge resistance. Its clamping behavior is defined by a 10/1000 µs waveform test condition, with 37.5 V maximum clamping voltage at 40 A IPPM and 1.0 mA test current for VBR measurement.
It supports 200 A non-repetitive forward surge current (8.3 ms half-sine), exhibits 3.5 V max forward voltage at 100 A, and maintains stable performance up to 175 °C junction temperature - enabling use in high-temperature under-hood automotive modules and industrial motor drive control boards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 25.7 V / 28.4 V - defines reliable conduction onset threshold under 1.0 mA test current |
| VWM | 23.1 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 µA |
| VC @ IPPM | 37.5 V - clamped voltage seen by protected circuit during 40 A transient event |
| PPPM | 1500 W - peak transient energy absorption capability per 10/1000 µs pulse |
| IPPM | 40.0 A - maximum non-repetitive surge current the device safely clamps |
| TJ range | -55 °C to +175 °C - enables deployment in engine control units and industrial PLCs without derating |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, critical for PCB copper pour design |
Pinout & Package
Package: JEDEC DO-201AD (Case Style 1.5KE), axial-leaded, molded epoxy body with matte tin-plated leads; cathode indicated by color band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side of protected line; reverse-biased during normal operation |
| Cathode | Clamping reference node | Marked with color band; tied to higher-potential rail or ground depending on protection topology |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling |
| 1500 W peak pulse power | Handles lightning-induced surges per IEC 61000-4-5 Level 4 (4 kV) without failure |
| Sub-nanosecond response | Clamps transients before sensitive ICs experience overstress (e.g., MCU I/O pins) |
| AEC-Q101 qualified option available | HE3 suffix variants meet automotive-grade stress testing for powertrain and body electronics |
| RoHS-compliant E3 suffix | Meets JESD 201 Class 1A whisker resistance and J-STD-002 solderability standards |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 12 V battery feed to engine control unit exposed to load dump (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Primary shunt clamp absorbing >100 J transient energy while holding downstream regulator input below 40 V. Use Value: Prevents destruction of LDOs and microcontrollers during alternator field collapse events. | Use Scenario: 4–20 mA current loop interface in factory automation PLC analog input module. IC Role / Device Role / Timing Role: Fast-acting voltage limiter placed across loop terminals to suppress ESD and inductive kickback from solenoid actuation. Use Value: Maintains signal integrity and prevents false triggering of ADC front-end due to 8/20 µs surges up to 30 A. |
| Consumer Power Adapter Output Protection | Telecom DC Feeder Line Protection |
Use Scenario: Secondary-side 5 V/9 V output of wall adapter subjected to conducted EFT (IEC 61000-4-4). IC Role / Device Role / Timing Role: Unidirectional TVS placed between VOUT and GND to clamp fast-rising transients before reaching USB port controller. Use Value: Limits voltage excursion to ≤37.5 V during 5 kHz burst, preserving USB PHY compliance. | Use Scenario: -48 V DC feeder line feeding remote radio head in cellular base station. IC Role / Device Role / Timing Role: Standoff-rated TVS (23.1 V) used in series with current-limiting resistor to protect PoE-like interface ICs from induced surges. Use Value: Enables robust operation under telecom lightning surge tests (ITU-T K.20/21) without latch-up or parametric shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A | Lower PPPM (600 W), smaller SMB package (3.5 mm x 3.5 mm), VC = 38.9 V @ 15.4 A | Not suitable for 1500 W load dump; preferred for space-constrained consumer PCBs | Select when board area is limited and surge energy is ≤20 J |
| 1.5KE27CA | Bidirectional variant; same VBR/VC specs but symmetric clamping in both polarities | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) | Choose only if bidirectional protection is mandated by system architecture |
Compared with SMBJ24A and 1.5KE27CA, the 1.5KE27A-E3/51 provides higher surge robustness in a through-hole package ideal for high-energy industrial inputs, while offering lower thermal resistance than SMBJ-series and unidirectional optimization for DC rail protection where polarity is fixed.
Availability
1.5KE27A-E3/51 is available at Aetrix Electronics and suitable for automotive power systems, industrial sensor interfaces, consumer power adapters, and telecom DC feeder lines requiring stable component supply and long-lifecycle support.
Supply support for 1.5KE27A-E3/51 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 and AEC-Q qualification.
The 1.5KE series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where sustained surge immunity and thermal stability are mandatory.
FAQ
What is the clamping voltage of the 1.5KE27A-E3/51 under maximum rated surge current?
The 1.5KE27A-E3/51 has a maximum clamping voltage (VC) of 37.5 V when subjected to its rated peak pulse current of 40.0 A using the standard 10/1000 µs waveform. This value is measured per JEDEC test conditions and ensures downstream components remain within safe operating voltage limits during transient events. The 1.5KE27A-E3/51 achieves this clamping performance while maintaining low incremental surge resistance and sub-nanosecond response.
Is the 1.5KE27A-E3/51 RoHS compliant and lead-free?
Yes, the 1.5KE27A-E3/51 carries the "E3" suffix, indicating full RoHS compliance per Directive 2011/65/EU and exemption 6(c)-I. Its matte tin-plated leads meet J-STD-002 solderability requirements and JESD 201 Class 1A whisker resistance testing. The molding compound satisfies UL 94 V-0 flammability rating, and the device is manufactured under Vishay's commercial-grade quality system. The 1.5KE27A-E3/51 does not contain lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits.
How does the 1.5KE27A-E3/51 differ from the 1.5KE27CA variant?
The 1.5KE27A-E3/51 is unidirectional, with polarity marked by a cathode band and optimized for DC rail protection where voltage polarity is fixed. The 1.5KE27CA is bidirectional, lacking polarity marking and providing symmetrical clamping for AC or floating lines like RS-485 or CAN. Both share identical VBR, VC, and PPPM ratings, but the 1.5KE27A-E3/51 offers lower leakage at VWM (1.0 µA vs. 2.0 µA for CA types ≤10 V VR). Use the 1.5KE27A-E3/51 when protecting grounded DC supplies.
What is the maximum operating temperature for the 1.5KE27A-E3/51?
The 1.5KE27A-E3/51 has a specified junction temperature range of -55 °C to +175 °C, with derated power dissipation above 25 °C ambient per Figure 2 in the Vishay datasheet (Document Number: 88301). At 100 °C ambient, its usable power drops to ~3.5 W; at 125 °C, it falls to ~2.2 W. This wide thermal range allows integration into under-hood automotive ECUs and industrial motor drives without external heatsinking. The 1.5KE27A-E3/51 maintains parameter stability across this full range when mounted per JEDEC 1.5KE footprint guidelines.
Can the 1.5KE27A-E3/51 be used in parallel for higher surge handling?
While the 1.5KE27A-E3/51 datasheet notes TVS diodes can be used in parallel to increase peak power ratings, doing so requires careful layout: matched trace lengths, symmetrical thermal coupling, and individual current-sharing resistors to prevent imbalance. Without such measures, mismatched dynamic impedance may cause one device to absorb >80 % of the surge, leading to premature failure. For most designs, selecting a higher-rated single device (e.g., 1.5KE33A) is more reliable than paralleling 1.5KE27A-E3/51 units. Always validate parallel operation with actual surge testing.
1.5KE27A-E3/51 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 23.1V
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 37.5V
- Current - Peak Pulse (10/1000µs):
- 40A
- 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
1.5KE27A-E3/51 FAQ
1.How can I place an order for 1.5KE27A-E3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE27A-E3/51 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 1.5KE27A-E3/51 reliable?
The price and inventory of 1.5KE27A-E3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE27A-E3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE27A-E3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE27A-E3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE27A-E3/51?
1.5KE27A-E3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE27A-E3/51 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 1.5KE27A-E3/51?
For technical support, including 1.5KE27A-E3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE27A-E3/51 requirements.
6.How does Aetrix verify that 1.5KE27A-E3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE27A-E3/51 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 1.5KE27A-E3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE27A-E3/51?
All 1.5KE27A-E3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE27A-E3/51, 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 1.5KE27A-E3/51 part is unused and in its original packaging.
Return procedure for 1.5KE27A-E3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE27A-E3/51 Tags
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