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Vishay General Semiconductor - Diodes Division 1.5KE20CAHE3/51
- Part No.:
- 1.5KE20CAHE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE20CAHE3/51.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:2,420
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Product details
Overview
1.5KE20CAHE3/51 from Vishay General Semiconductor is a bi-directional Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 20 V breakdown voltage (VBR = 19.0–21.0 V at 1.0 mA), 1500 W peak pulse power (10/1000 µs), clamping voltage of 27.7 V at 54.2 A, and operates across –55 °C to +175 °C junction temperature. It is used to protect MOSFETs, ICs, and sensor interfaces against lightning-induced surges and inductive switching transients in automotive and industrial systems.
For engineers reviewing the 1.5KE20CAHE3/51 datasheet, 1.5KE20CAHE3/51 pinout, 1.5KE20CAHE3/51 application, or 1.5KE20CAHE3/51 equivalent, this device offers AEC-Q101 qualification, glass-passivated junction, RoHS-compliant matte tin leads, and UL 94 V-0 molded epoxy packaging - critical for high-reliability transient suppression in harsh environments.
Technical Context
The 1.5KE20CAHE3/51 is a bi-directional TVS diode with symmetrical clamping behavior in both polarities, enabling protection of AC-coupled or floating signal paths without polarity concerns. Its low incremental surge resistance and sub-nanosecond response time (<1 ns) ensure effective clamping before sensitive downstream components experience damaging overvoltage.
It employs a silicon avalanche structure with glass-passivated chip junction and is rated for 1500 W peak pulse power under JEDEC-standard 10/1000 µs waveform at 0.01% duty cycle. Thermal performance is characterized by RθJA = 75 °C/W and RθJL = 15.4 °C/W, supporting reliable operation up to TJ = 175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 19.0 V / 21.0 V at IT = 1.0 mA - defines precise avalanche initiation threshold for bidirectional clamping |
| VC @ IPPM | 27.7 V at 54.2 A - maximum clamped voltage during 10/1000 µs surge, limiting stress on protected circuitry |
| PPPM | 1500 W - peak transient energy absorption capability, suitable for lightning and EFT immunity per IEC 61000-4-5 |
| VWM | 17.1 V - maximum working voltage; ensures no conduction during normal operation up to rated system voltage |
| IR @ VWM | 1.0 µA - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss |
| TJ range | –55 °C to +175 °C - supports under-hood automotive, industrial motor drives, and outdoor telecom equipment |
| Package | Case Style 1.5KE - axial-leaded DO-201AD package with 0.375" lead length, UL 94 V-0 compliant epoxy body |
Pinout & Package
1.5KE20CAHE3/51 uses a bi-directional axial-leaded DO-201AD (Case Style 1.5KE) package with no polarity marking - both terminals are electrically symmetric. Leads are matte tin-plated, solderable per J-STD-002/JESD 22-B102, and qualified to JESD 201 Class 2 whisker test (HE3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional avalanche junction | No cathode band; identical clamping in either direction - ideal for AC line or differential signal protection |
| Lead 1 | Terminal connection | Matte tin-plated copper alloy; supports wave/solder reflow up to 275 °C for 10 s (JESD 22-B106) |
| Lead 2 | Terminal connection | Same metallization and thermal specs as Lead 1; enables mechanical symmetry in PCB layout |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard |
| Glass-passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives, critical for field longevity |
| 1500 W peak pulse rating | Meets IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly mounted with low-inductance layout |
| Sub-1 ns response time | Clamps transients before propagation into protected ICs - faster than MOVs or polymer-based suppressors |
| UL 94 V-0 molding compound | Self-extinguishing epoxy housing prevents flame propagation in safety-critical enclosures and battery systems |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V power rails in engine control units (ECUs) and body control modules against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bi-directional clamping element placed upstream of DC/DC converters and microcontrollers. Use Value: Limits transient voltage to ≤27.7 V during 1500 W surges, preventing latch-up or gate oxide rupture in downstream semiconductors. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation PLCs exposed to relay coil flyback and ESD. IC Role / Device Role / Timing Role: Low-capacitance shunt protector on differential or single-ended signal lines interfacing with ADC inputs. Use Value: Sub-1 ns response and 1.0 µA leakage preserve signal fidelity while absorbing ±2 kV contact ESD per IEC 61000-4-2. |
| Telecom AC/DC Adapter Input | Consumer Appliance Motor Drive Stage |
|
Use Scenario: Secondary-side surge protection on AC/DC adapter outputs feeding set-top boxes or VoIP gateways. IC Role / Device Role / Timing Role: Bidirectional clamp between VOUT and GND, coordinated with primary-side MOV for full-system compliance. Use Value: 17.1 V stand-off voltage allows stable 19 V nominal output operation while clamping lightning surges to safe levels. |
Use Scenario: Overvoltage suppression across H-bridge MOSFETs in washing machine motor inverters subjected to back-EMF spikes. IC Role / Device Role / Timing Role: Parallel-connected TVS across each half-bridge leg to clamp inductive kickback during PWM switching. Use Value: 27.7 V clamping voltage ensures MOSFET VDS stress remains below 80% of rated 60 V breakdown, extending lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA | DO-214AA (SMB) package, lower PPPM = 600 W, same VBR range and bi-directionality | Better suited for space-constrained PCBs; lower surge capacity limits use to Level 2/3 IEC 61000-4-5 | Select SMBJ20CA when board area is constrained and peak surge energy is ≤600 W |
| 1.5KE20C | Same 1.5KE package and electrical specs, but lacks HE3 suffix - not AEC-Q101 qualified or JESD 201 Class 2 whisker tested | Restricted to commercial-grade applications; unsuitable for automotive or long-life industrial deployments | Choose 1.5KE20C only for cost-sensitive non-automotive designs where qualification is not required |
Compared with SMBJ20CA and 1.5KE20C, the 1.5KE20CAHE3/51 uniquely combines AEC-Q101 qualification, 1500 W surge rating, and axial-leaded DO-201AD mechanical robustness - making it the preferred choice for automotive power rail protection and high-energy industrial surge scenarios where reliability and legacy through-hole compatibility are essential.
Availability
1.5KE20CAHE3/51 is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, telecom power supplies, and consumer appliance motor controls requiring stable component supply and long-term lifecycle support.
Supply support for 1.5KE20CAHE3/51 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, and protection devices with emphasis on reliability, efficiency, and qualification for demanding environments.
The 1.5KE series was engineered specifically for high-energy transient suppression in automotive, industrial, and telecom infrastructure - delivering consistent clamping performance across wide temperature ranges and extended service life.
FAQ
What is the breakdown voltage tolerance for 1.5KE20CAHE3/51?
The 1.5KE20CAHE3/51 has a specified breakdown voltage range of 19.0 V to 21.0 V at a test current of 1.0 mA, corresponding to a ±5% tolerance around the nominal 20 V rating. This tight VBR window ensures predictable clamping onset and compatibility with 17.1 V maximum working voltage (VWM) requirements in 18–20 V systems. The 1.5KE20CAHE3/51 maintains this specification across its full operating temperature range.
Is 1.5KE20CAHE3/51 suitable for automotive applications?
Yes, the 1.5KE20CAHE3/51 is AEC-Q101 qualified and explicitly rated for automotive use per Vishay documentation. Its construction includes glass-passivated junction, JESD 201 Class 2 whisker-tested matte tin leads, and operation up to +175 °C junction temperature - meeting key requirements for under-hood and powertrain applications. The 1.5KE20CAHE3/51 is commonly deployed in ECUs, body control modules, and ADAS power supplies.
How does the clamping voltage of 1.5KE20CAHE3/51 compare to its breakdown voltage?
The 1.5KE20CAHE3/51 clamps to 27.7 V at its rated peak pulse current of 54.2 A (10/1000 µs waveform), which is approximately 39% above its minimum breakdown voltage of 19.0 V. This incremental clamping voltage (ΔVC = 8.7 V) reflects low dynamic impedance and ensures protected circuits remain within safe operating limits during high-energy transients. The 1.5KE20CAHE3/51 achieves this with minimal voltage overshoot due to its sub-nanosecond response.
What package type does 1.5KE20CAHE3/51 use, and what are its mechanical dimensions?
The 1.5KE20CAHE3/51 uses the DO-201AD axial-leaded package (Case Style 1.5KE), with overall dimensions of 5.3 mm diameter × 9.5 mm body length and 0.375" (9.5 mm) lead length. The epoxy body meets UL 94 V-0 flammability rating, and leads are matte tin-plated per J-STD-002. This through-hole package provides superior thermal dissipation and mechanical robustness compared to surface-mount alternatives like SMB or SMC.
Does 1.5KE20CAHE3/51 require polarity-aware PCB layout?
No - the 1.5KE20CAHE3/51 is a bi-directional TVS diode with symmetrical electrical characteristics in both directions, and carries no polarity marking on the package. Its CA suffix confirms bi-directional functionality, meaning either lead can connect to the line or ground side of the protected circuit. This simplifies layout, eliminates orientation errors during assembly, and supports AC-coupled or floating signal path protection without additional design constraints. The 1.5KE20CAHE3/51 functions identically regardless of terminal orientation.
1.5KE20CAHE3/51 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 17.1V
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 27.7V
- Current - Peak Pulse (10/1000µs):
- 54.2A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE20CAHE3/51 FAQ
1.How can I place an order for 1.5KE20CAHE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE20CAHE3/51 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 1.5KE20CAHE3/51 reliable?
The price and inventory of 1.5KE20CAHE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE20CAHE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE20CAHE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE20CAHE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE20CAHE3/51?
1.5KE20CAHE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE20CAHE3/51 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 1.5KE20CAHE3/51?
For technical support, including 1.5KE20CAHE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE20CAHE3/51 requirements.
6.How does Aetrix verify that 1.5KE20CAHE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE20CAHE3/51 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 1.5KE20CAHE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE20CAHE3/51?
All 1.5KE20CAHE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE20CAHE3/51, 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 1.5KE20CAHE3/51 part is unused and in its original packaging.
Return procedure for 1.5KE20CAHE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE20CAHE3/51 Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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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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