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Littelfuse Inc. 1.5KE39CA-B
- Part No.:
- 1.5KE39CA-B
- Manufacturer:
- Littelfuse Inc.
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE39CA-B.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:4,395
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Product details
Overview
1.5KE39CA-B from Diodes Incorporated is a bidirectional 1500W transient voltage suppressor (TVS) diode in DO-201 package, designed for primary-level overvoltage protection in DC power rails and signal lines. It features a 33.3V reverse standoff voltage, 37.1–41.0V breakdown range at 1mA, 53.9V clamping voltage at 28A peak pulse current, and operates from –55°C to +175°C.
For engineers reviewing the 1.5KE39CA-B datasheet, 1.5KE39CA-B pinout, 1.5KE39CA-B application, or 1.5KE39CA-B equivalent, key selection criteria include clamping ratio (VC/VRWM ≈ 1.62), unidirectional vs. bidirectional polarity, DO-201 axial lead mechanical compatibility, and compliance with IEC 61000-4-2 Level 4 ESD immunity requirements.
Technical Context
This bidirectional TVS diode uses glass-passivated silicon junctions to achieve fast response time (<1.0 ps) and stable clamping under repetitive surge events. Its symmetrical avalanche structure enables equal clamping in both polarities, making it suitable for AC-coupled or floating signal paths where polarity reversal may occur.
The device is rated for 1500W peak pulse power (10/1000μs waveform), 5.0W steady-state dissipation at 75°C lead temperature, and exhibits low voltage temperature coefficient (+0.100%/°C), ensuring predictable performance across automotive and industrial ambient ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W - Sustains 10/1000μs surges up to 28A without failure |
| Reverse Standoff Voltage (VRWM) | 33.3 V - Maximum continuous DC or RMS voltage before significant leakage |
| Breakdown Voltage (VBR) | 37.1–41.0 V @ 1mA - Confirmed avalanche initiation window for reliable triggering |
| Clamping Voltage (VC) | 53.9 V @ 28A - Limits transient voltage seen by downstream circuitry |
| Leakage Current (IR) | 5.0 μA @ 33.3V - Ensures minimal standby power loss and signal integrity |
| Operating Temperature | –55°C to +175°C - Validated for under-hood automotive and high-temp industrial use |
Pinout & Package
Package: DO-201 axial-leaded through-hole package with transfer-molded epoxy body (UL 94V-0), 1.12g mass, and tin-finished leads solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (Bidirectional) | Reversible avalanche terminals | No polarity marking; symmetric conduction enables AC line protection without orientation constraints |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Enhances long-term reliability and moisture resistance versus epoxy-only passivation |
| Bidirectional configuration | Eliminates need for polarity-aware PCB layout in differential or AC-coupled interfaces |
| RoHS-compliant, halogen-free "Green" design | Meets EU Directive 2015/863/EU with Br+Cl <1500 ppm and Sb <1000 ppm |
| Fast response time | Sub-nanosecond turn-on ensures clamping before sensitive ICs experience overstress |
Applications
| Automotive Power Supply Protection | Industrial PLC Input Protection |
|---|---|
|
Use Scenario: 12V battery rail in engine control units exposed to load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: Primary clamping device placed upstream of DC-DC converters and microcontrollers. Use Value: Clamps 53.9V at 28A to protect 36V-rated input stages while surviving repeated 1500W pulses. |
Use Scenario: 24V digital input modules receiving signals from field sensors in factory automation environments. IC Role / Device Role / Timing Role: Bidirectional surge limiter on isolated digital inputs subject to induced lightning surges (IEC 61000-4-5). Use Value: Symmetric clamping prevents false triggering during polarity-reversal faults and maintains >10kV ESD immunity. |
| Telecom Line Interface Protection | Renewable Energy Inverter DC Link |
|
Use Scenario: RS-485 transceiver bus lines in outdoor base stations subjected to induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Secondary-level TVS placed after gas discharge tube (GDT) front-end for fine clamping. Use Value: Low clamping ratio (1.62× VRWM) limits voltage stress on ±12V transceiver I/O pins during combined GDT-TVSS coordination. |
Use Scenario: DC link between PV array and MPPT controller in solar inverters operating at elevated ambient temperatures. IC Role / Device Role / Timing Role: Overvoltage clamp on 400–600V DC bus during rapid string disconnection or grid fault recovery. Use Value: Extended temperature range (–55°C to +175°C) supports operation inside sealed, thermally constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36CA | Lower peak power (600W), smaller SMB package, 36V VRWM, 58.1V VC @ 10.3A | Preferred for space-constrained PCBs with lower surge energy requirements (IEC 61000-4-2 only) | Select when board area is critical and surge threat level is Class 3 or below |
| 1.5SMC39CA | Same 1500W rating and 33.3V VRWM, but SMC (DO-214AB) surface-mount package, 53.3V VC @ 28.1A | Used where automated assembly and higher vibration resistance are required | Choose for reflow-soldered designs needing identical electrical performance in SMT format |
Compared with 1.5KE39CA-B, SMBJ36CA trades surge robustness for compactness, while 1.5SMC39CA delivers identical clamping behavior in a surface-mount form factor-enabling direct functional replacement where mounting method permits.
Availability
1.5KE39CA-B is available at Aetrix Electronics and suitable for automotive power systems, industrial PLC inputs, telecom line interfaces, and renewable energy inverter DC links requiring stable component supply and legacy-compatible axial-leaded TVS protection.
Supply support for 1.5KE39CA-B 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
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal devices, with manufacturing certified to IATF 16949 and quality systems aligned with AEC-Q200 standards.
This part belongs to the 1.5KE series of high-power axial TVS diodes, engineered specifically for robust overvoltage protection in harsh-environment applications including automotive, industrial, and infrastructure systems.
FAQ
What does the "-B" suffix indicate in 1.5KE39CA-B?
The "-B" suffix denotes bulk packaging: 1,000 pieces per bulk carrier. This contrasts with "-T", which indicates 1,000-piece 13-inch tape-and-reel packaging. The "C" in "39CA" confirms bidirectional polarity, and "A" indicates standard tolerance (±5% on VBR).
Is 1.5KE39CA-B compliant with AEC-Q200?
No-1.5KE39CA-B is not AEC-Q200 qualified. While Diodes offers AEC-Q200 versions in the same 1.5KE family (e.g., 1.5KE39CAQ-B), this specific part number is intended for industrial and commercial applications. Automotive-grade variants require explicit Q200 qualification notation and PPAP documentation.
How does the clamping voltage of 53.9V relate to system-level protection design?
The 53.9V clamping voltage defines the maximum instantaneous voltage imposed on protected circuitry during a 28A 10/1000μs surge. Designers must ensure all downstream components-including MOSFETs, regulators, and interface ICs-have absolute maximum ratings exceeding 53.9V, with margin for tolerance and temperature drift.
Can 1.5KE39CA-B replace unidirectional 1.5KE39A-B in existing designs?
No-direct substitution is not recommended. The bidirectional 1.5KE39CA-B conducts in both directions, whereas the unidirectional 1.5KE39A-B blocks reverse current. Replacing A with CA may cause unintended conduction paths, increased leakage, or failure to clamp correctly in DC-biased circuits.
1.5KE39CA-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Littelfuse Inc.
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- 1.5KE
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 53.9V
- Current - Peak Pulse (10/1000µs):
- 28.2A
- 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:
- DO-201
1.5KE39CA-B FAQ
1.How can I place an order for 1.5KE39CA-B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE39CA-B 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 1.5KE39CA-B reliable?
The price and inventory of 1.5KE39CA-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE39CA-B is usually 5 days.
3.What payment methods are accepted for 1.5KE39CA-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE39CA-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE39CA-B?
1.5KE39CA-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE39CA-B 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 1.5KE39CA-B?
For technical support, including 1.5KE39CA-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE39CA-B requirements.
6.How does Aetrix verify that 1.5KE39CA-B is sourced from the original manufacturer or authorized distributors?
All 1.5KE39CA-B 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 1.5KE39CA-B meets industry standards.
7.What is the process for return or replacement of 1.5KE39CA-B?
All 1.5KE39CA-B units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE39CA-B, 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 1.5KE39CA-B part is unused and in its original packaging.
Return procedure for 1.5KE39CA-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE39CA-B Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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