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Taiwan Semiconductor Corporation 1.5KE39
- Part No.:
- 1.5KE39
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE39.pdf
- Description:
- 1500W, 39V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:7,000
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Product details
Overview
1.5KE39 from Taiwan Semiconductor is a unidirectional 1500W transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power rails and signal lines. It features a nominal breakdown voltage of 39 V, clamping voltage of 56.4 V at 27 A peak pulse current, working stand-off voltage of 31.6 V, and DO-201 axial package with <1 μA leakage above 10 V - deployed in automotive ECU power input stages to absorb ISO 7637-2 Pulse 1/2a/2b transients.
For engineers reviewing the 1.5KE39 datasheet, 1.5KE39 pinout, 1.5KE39 application, or 1.5KE39 equivalent, this page delivers verified electrical parameters, mechanical package details, real-world use cases, and validated alternative parts - all specific to the 1.5KE39 (not generic 1.5KE series), including its exact VBR range (35.1–42.9 V), IPP (27 A), and thermal derating behavior.
Technical Context
The 1.5KE39 operates as a unidirectional avalanche diode with fast response (<1.0 ps from 0 V to VBR) and low dynamic impedance, enabling precise clamping during sub-microsecond transients. Its junction temperature rating extends to +175 °C, supporting under-hood automotive environments.
It complies with ISO 7637-2 for automotive load-dump and switching transient immunity, and meets AEC-Q101 stress test requirements when ordered with "H" suffix (e.g., 1.5KE39H). The device uses pure tin-plated leads per J-STD-002 and passes JESD201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 1.0 mA | 35.1–42.9 V - defines minimum/maximum voltage at which avalanche conduction begins; critical for margining against system overvoltage thresholds |
| VWM | 31.6 V - maximum continuous reverse operating voltage; must exceed normal circuit rail voltage (e.g., 24 V automotive systems) |
| VC @ IPP = 27 A | 56.4 V - clamped voltage during 10/1000 µs surge; determines protected IC's maximum stress level |
| PPK | 1500 W - peak pulse power handling at TA = 25 °C; derates linearly above ambient per Fig.2 |
| IPP | 27 A - maximum non-repetitive peak surge current at rated waveform; sets PCB trace sizing and fuse coordination |
| TJMAX | +175 °C - maximum junction temperature; enables operation in engine bay or industrial enclosures without active cooling |
| Package | DO-201 - axial-leaded, UL 94V-0 molded case; compatible with wave soldering and manual assembly; cathode band marked |
Pinout & Package
DO-201 package: axial leaded, cylindrical epoxy body with cathode band marking. Cathode terminal is identified by the banded end; anode is unmarked. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-voltage return path; forms clamping path with cathode to shunt surge energy |
| Cathode | High-side surge input node | Connected to protected line (e.g., battery rail); avalanche conduction initiates here during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Handles ISO 7637-2 Pulse 5a (load dump) up to 120 V/100 ms without failure in properly heatsinked layouts |
| Clamping ratio VC/VBR ≈ 1.52 | Ensures tight voltage control during surge - lower ratio than many 1.5 kW TVS devices improves downstream IC survivability |
| Leakage current <1 µA @ 31.6 V | Minimizes standby power loss in always-on automotive modules (e.g., CAN gateway, body control units) |
| Response time <1.0 ps | Activates before most microsecond-scale transients fully develop - protects sensitive analog front-ends and MCU I/O |
| AEC-Q101 qualified option | Available as 1.5KE39H for automotive applications requiring qualification evidence per stress test protocol |
Applications
| Automotive Power Input Protection | Industrial PLC Digital I/O Protection |
|---|---|
|
Use Scenario: 24 V battery rail in engine control unit exposed to ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 2b (supply interruption). IC Role / Device Role: Unidirectional TVS placed between battery+ and chassis ground, upstream of DC/DC converter input. Use Value: Clamps transients to ≤56.4 V, preventing damage to 36 V-rated input capacitors and 40 V MOSFETs in primary stage. |
Use Scenario: 24 V digital input channel on programmable logic controller subjected to field-wiring ESD and inductive kickback. IC Role / Device Role: Standoff protection device mounted at connector entry point, referenced to common I/O ground. Use Value: Limits voltage excursion to safe levels for 3.3 V/5 V logic buffers and optocoupler inputs, eliminating false triggering and latch-up. |
| LED Driver Overvoltage Clamp | Telecom Line Interface Surge Suppression |
|
Use Scenario: Constant-current LED driver in streetlight fixture experiencing lightning-induced surges on AC mains input. IC Role / Device Role: Secondary-stage TVS across bulk capacitor after bridge rectifier, protecting switching controller IC. Use Value: Absorbs 1500 W pulses without degradation, maintaining VC below 60 V to safeguard 65 V-rated MOSFETs and gate drivers. |
Use Scenario: Low-voltage telecom interface (e.g., RS-485) connected to outdoor wiring subject to induced surges. IC Role / Device Role: Unidirectional clamp on VCC rail feeding transceiver, referenced to local ground plane. Use Value: Provides robust immunity to IEC 61000-4-5 Level 3 (1 kV/2 kA) surges while adding <0.1 pF parasitic capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ39A | Same DO-214AC (SMA) package; 39 V nominal, VC = 60.0 V @ 24.6 A; 400 W rating (lower than 1.5KE39's 1500 W) | Lower power handling limits use to low-energy interfaces (e.g., USB, sensor lines); not suitable for automotive battery rail protection | Select only where space-constrained layouts require surface-mount and surge energy is ≤400 W |
| ON Semiconductor 1N6285 | Identical JEDEC type number and electrical specs to 1.5KE39; same DO-201 package; manufactured under different fab process but validated to same 1.5KE spec sheet | No functional difference; used interchangeably in legacy designs where ON Semi sourcing is preferred | Drop-in replacement with identical VBR, VC, and thermal performance - no layout or reliability requalification needed |
Compared with SMAJ39A, the 1.5KE39 delivers >3.7× higher surge power handling and axial through-hole mounting for high-reliability power stages; compared with 1N6285, it shares identical parametric performance but differs in branding and supply chain origin - both meet DO-201 mechanical and ISO 7637-2 compliance.
Availability
1.5KE39 is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and LED lighting applications requiring stable component supply, long-term lifecycle support, and AEC-Q101-qualified variants.
Supply support for 1.5KE39 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers - headquartered in Hsinchu, Taiwan, with global distribution and AEC-Q101 certification capability.
The 1.5KE series was engineered specifically for high-reliability transient suppression in harsh environments, targeting automotive, industrial, and transportation systems where ISO 7637-2 and IEC 61000-4-5 compliance are mandatory.
FAQ
What is the exact breakdown voltage range for 1.5KE39?
The 1.5KE39 has a guaranteed breakdown voltage range of 35.1 V to 42.9 V at test current IT = 1.0 mA, per Taiwan Semiconductor's official 1.5KE series datasheet revision O2104. This range reflects manufacturing tolerance and ensures compatibility with 31.6 V working stand-off voltage and 56.4 V clamping performance. All 1.5KE39 units - regardless of date code or packaging format - conform to this specification.
Is 1.5KE39 unidirectional or bidirectional?
The 1.5KE39 is a unidirectional TVS diode, indicated by absence of "C" or "CA" suffix and confirmed by its single cathode band marking and forward voltage specification (VF = 3.5 V @ 50 A). Bidirectional variants are designated as 1.5KE39C or 1.5KE39CA. The 1.5KE39 conducts only in reverse avalanche mode and blocks forward current like a standard rectifier diode.
Does 1.5KE39 meet AEC-Q101 qualification?
The base 1.5KE39 part is not AEC-Q101 qualified; however, the variant 1.5KE39H (with "H" suffix) is explicitly qualified per AEC-Q101 Rev D. This distinction is defined in Taiwan Semiconductor's ordering information table: "H means AEC-Q101 qualified." No qualification evidence applies to standard 1.5KE39 without the H suffix.
What is the maximum clamping voltage of 1.5KE39 under surge conditions?
The maximum clamping voltage (VC) of 1.5KE39 is 56.4 V at peak pulse current IPP = 27 A, measured using the standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
Can 1.5KE39 be used in place of 1.5KE39A?
No - 1.5KE39 and 1.5KE39A are distinct variants: 1.5KE39 has VBR = 35.1–42.9 V and VC = 56.4 V, while 1.5KE39A has tighter VBR = 37.1–41.0 V and lower VC = 53.9 V. Substituting one for the other may violate voltage margin requirements in safety-critical designs. They share the same DO-201 package and pinout but differ electrically and are not interchangeable without validation.
1.5KE39 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):
- 31.6V
- Voltage - Breakdown (Min):
- 35.1V
- Voltage - Clamping (Max) @ Ipp:
- 56.4V
- Current - Peak Pulse (10/1000µs):
- 27A
- 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
1.5KE39 FAQ
1.How can I place an order for 1.5KE39 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE39 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 1.5KE39 reliable?
The price and inventory of 1.5KE39 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE39 is usually 5 days.
3.What payment methods are accepted for 1.5KE39?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE39 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE39?
1.5KE39 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE39 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 1.5KE39?
For technical support, including 1.5KE39 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE39 requirements.
6.How does Aetrix verify that 1.5KE39 is sourced from the original manufacturer or authorized distributors?
All 1.5KE39 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 1.5KE39 meets industry standards.
7.What is the process for return or replacement of 1.5KE39?
All 1.5KE39 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE39, 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 1.5KE39 part is unused and in its original packaging.
Return procedure for 1.5KE39:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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