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Taiwan Semiconductor Corporation 1.5KE56
- Part No.:
- 1.5KE56
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE56.pdf
- Description:
- 1500W, 56.1V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:9,272
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Product details
Overview
1.5KE56 from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and signal paths. It features a 56V nominal breakdown voltage (VBR min/max: 50.4V–61.6V), 1500W peak pulse power rating at 10/1000μs, clamping voltage of 80.5V at 19A peak current, and DO-201 axial package - used in automotive power supply rail protection against ISO 7637-2 pulses.
For engineers reviewing the 1.5KE56 datasheet, 1.5KE56 pinout, 1.5KE56 application, or 1.5KE56 equivalent, key selection criteria include its unidirectional polarity, 45.4V working stand-off voltage (VWM), <1μA leakage above 10V, 175°C max junction temperature, and AEC-Q101 qualification availability - critical for automotive ECU and industrial control interface hardening.
Technical Context
The 1.5KE56 operates as a silicon avalanche diode with fast response time (<1.0ps from 0V to VBR), low dynamic impedance, and stable clamping under repetitive transients. Its unidirectional configuration enables asymmetric protection on positive-rail circuits without reverse conduction path requirements.
It complies with ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms and meets UL 94V-0 flammability standards. The device is rated for 200A non-repetitive forward surge current (IFSM) and exhibits a temperature coefficient of VBR at 0.103%/°C - enabling predictable voltage drift across automotive temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Voltage | 56V - defines primary clamping threshold for overvoltage events in 48V/56V system rails. |
| Breakdown Voltage (VBR) | 50.4V–61.6V @ IT = 1.0mA - ensures reliable avalanche initiation within tight tolerance for consistent protection onset. |
| Working Stand-off Voltage (VWM) | 45.4V - maximum continuous DC voltage the device blocks without significant leakage, allowing safe operation below 56V nominal. |
| Peak Pulse Power (PPK) | 1500W @ 10/1000μs - sustains high-energy surges typical of load dump or inductive switching in automotive environments. |
| Clamping Voltage (VC) | 80.5V @ IPP = 19A - limits downstream voltage stress during surge, protecting 80V-rated ICs and MOSFETs. |
| Junction Temperature Range | −55°C to +175°C - supports under-hood deployment and industrial ambient extremes without derating loss. |
| Leakage Current (ID) | <1μA @ VWM - minimizes standby power loss and avoids false triggering in low-power sensor interfaces. |
Pinout & Package
Package: DO-201 axial leaded package with cathode band marking; RoHS-compliant, halogen-free molding compound; pure tin-plated leads per J-STD-002; weight ≈ 0.090g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or return path; forms avalanche conduction path when cathode-to-anode voltage exceeds VBR. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., battery rail); carries full surge current during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification option | Available in H-suffix variants (e.g., 1.5KE56H) for automotive-grade reliability validation including temperature cycling and HTRB. |
| Fast response time | <1.0ps rise-to-VBR - intercepts nanosecond-scale ESD and EFT transients before sensitive circuitry reacts. |
| Low dynamic impedance | Ensures minimal voltage overshoot during high-di/dt surges, maintaining clamping accuracy under real-world pulse shapes. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) - covers full automotive EMC immunity scope. |
| UL 94V-0 flammability | Prevents fire propagation in high-energy fault conditions, satisfying safety-critical enclosure and wiring harness requirements. |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting 48V/56V battery-fed ECUs from load dump transients up to 120V and 100ms duration per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp overvoltage before it reaches regulator ICs. Use Value: Limits peak voltage to ≤80.5V, preventing damage to 100V-input buck controllers and preserving system uptime during alternator regulation faults. |
Use Scenario: Shielding 24V digital input modules in programmable logic controllers from inductive kickback generated by solenoid valve switching. IC Role / Device Role / Timing Role: Front-end surge suppression on dry-contact inputs, absorbing 1500W transients before signal conditioning op-amps and microcontroller GPIOs. Use Value: Enables robust 10kV ESD and 1kV EFT immunity per IEC 61000-4-2/4-4, reducing field failure rates in factory automation environments. |
| LED Driver Overvoltage Clamp | Telecom Line Interface Protection |
|
Use Scenario: Safeguarding constant-current LED drivers in street lighting systems exposed to lightning-induced surges on long outdoor cable runs. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to shunt surge energy away from high-voltage MOSFETs and current-sense resistors. Use Value: Clamps 10/1000μs surges to 80.5V while dissipating 1500W, preventing catastrophic failure of 60V-rated driver ICs and extending luminaire service life. |
Use Scenario: Protecting RS-485 transceivers in building management systems connected to externally routed data cables susceptible to induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS on VCC rail and signal lines to absorb common-mode transients before they couple into differential receivers. Use Value: Maintains <1μA leakage at 45.4V VWM, avoiding interference with 3.3V/5V logic thresholds while delivering 1500W surge handling per line. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ56A | DO-214AA (SMB) package, 600W rating, lower clamping voltage (93.6V @ 6.4A), bidirectional standard variant available. | Better suited for PCB space-constrained designs but requires layout revision due to different footprint and lower surge capacity. | Select SMBJ56A only when board area is limited and 600W surge margin suffices; not drop-in for 1.5KE56's DO-201 mechanical mounting or 1500W requirement. |
| 1N6289A | Same manufacturer, same DO-201 package, tighter VBR tolerance (53.2–58.8V), identical 1500W rating and 77.0V clamping at 20A. | Functionally interchangeable in all 1.5KE56 applications; preferred where tighter voltage binning improves system-level margin. | 1N6289A is a direct JEDEC-registered variant of 1.5KE56 with enhanced VBR consistency - ideal for high-volume automotive production requiring tighter parametric control. |
Compared with 1.5KE56, SMBJ56A offers smaller footprint but sacrifices 60% surge power handling and requires PCB redesign, whereas 1N6289A delivers identical protection performance with improved VBR consistency - making it the optimal upgrade path without layout change.
Availability
1.5KE56 is available at Aetrix Electronics and suitable for automotive ECU power rail protection, industrial PLC I/O hardening, and LED driver overvoltage clamping requiring stable component supply across extended production lifecycles.
Supply support for 1.5KE56 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global automotive, industrial, and consumer markets since 1979.
The 1.5KE series was developed specifically for high-reliability transient suppression in harsh environments - emphasizing AEC-Q101 qualification, ISO 7637-2 compliance, and robust DO-201 packaging for under-hood and factory-floor deployment.
FAQ
What is the polarity configuration of the 1.5KE56?
The 1.5KE56 is a unidirectional TVS diode, meaning it conducts only when the cathode voltage exceeds the anode by ≥50.4V. Its polarity is marked by a cathode band on the DO-201 body, and it must be installed with cathode toward the protected line and anode to ground - unlike bidirectional variants such as 1.5KE56CA which protect both polarities.
Does the 1.5KE56 meet automotive qualification standards?
The base 1.5KE56 is not AEC-Q101 qualified, but its H-suffix variant (1.5KE56H) is fully AEC-Q101 certified for automotive use. This includes stress testing for temperature cycling, high-temperature reverse bias, and humidity bias - confirming reliability for engine control units, body electronics, and ADAS power domains.
What is the maximum clamping voltage of the 1.5KE56 under surge conditions?
The 1.5KE56 clamps to a maximum of 80.5V when subjected to its rated 19A peak impulse current (IPP) under the standard 10/1000μs waveform. This value is guaranteed across temperature and lifetime, ensuring downstream components rated for ≥85V remain within safe operating limits during surge events.
Can the 1.5KE56 replace the 1.5KE56A in existing designs?
Yes, the 1.5KE56 can replace the 1.5KE56A in most applications, but with reduced VBR tolerance (50.4–61.6V vs. 53.2–58.8V) and higher clamping voltage (80.5V vs. 77.0V). Use 1.5KE56 only where wider voltage spread and 3.5V higher clamping are acceptable - otherwise, 1.5KE56A provides tighter design margins.
What is the thermal derating behavior of the 1.5KE56 above 25°C ambient?
The 1.5KE56's peak pulse power rating decreases linearly above 25°C ambient per Figure 2 in the datasheet: at 75°C, it retains ~80% of 1500W (≈1200W); at 125°C, ~50% (≈750W). Derating is based on junction temperature limit of 175°C and assumes no heatsink - forced-air or copper pad cooling extends usable power range.
1.5KE56 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- 1.5KE
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 45.4V
- Voltage - Breakdown (Min):
- 50.4V
- Voltage - Clamping (Max) @ Ipp:
- 80.5V
- Current - Peak Pulse (10/1000µs):
- 19A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201
1.5KE56 FAQ
1.How can I place an order for 1.5KE56 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE56 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 1.5KE56 reliable?
The price and inventory of 1.5KE56 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE56 is usually 5 days.
3.What payment methods are accepted for 1.5KE56?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE56 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE56?
1.5KE56 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE56 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 1.5KE56?
For technical support, including 1.5KE56 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE56 requirements.
6.How does Aetrix verify that 1.5KE56 is sourced from the original manufacturer or authorized distributors?
All 1.5KE56 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 1.5KE56 meets industry standards.
7.What is the process for return or replacement of 1.5KE56?
All 1.5KE56 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE56, 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 1.5KE56 part is unused and in its original packaging.
Return procedure for 1.5KE56:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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