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Diodes Incorporated 1.5KE39CA-T
- Part No.:
- 1.5KE39CA-T
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE39CA-T.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:5,777
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Product details
Overview
1.5KE39CA-T from Diodes Incorporated is a bidirectional 1500W transient voltage suppressor (TVS) diode in DO-201 package, designed for clamping fast-rising ESD and surge transients on power and signal lines. It features a 33.3V reverse standoff voltage, 37.1–41.0V breakdown range at 1mA, 53.9V max clamping voltage at 28A peak pulse current, and operates from –55°C to +175°C - used in automotive power rail protection and industrial I/O interface surge suppression.
For engineers reviewing the 1.5KE39CA-T datasheet, 1.5KE39CA-T pinout, 1.5KE39CA-T application, or 1.5KE39CA-T equivalent, key selection criteria include clamping voltage margin relative to system operating voltage, unidirectional vs. bidirectional polarity requirements, DO-201 axial lead mechanical fit, and compliance with AEC-Q200 stress testing for automotive-grade reliability.
Technical Context
This bidirectional TVS diode functions as a voltage-clamped shunt protector: under normal operation it presents high impedance (>1MΩ at VRWM), but switches to low-impedance conduction within <1ns when transient voltage exceeds VBR, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable leakage and repeatable breakdown behavior across temperature.
The device uses an avalanche breakdown mechanism with a temperature coefficient of +0.100%/°C for VBR, enabling predictable clamping rise over temperature. Its 1.12g DO-201 package supports axial mounting and meets UL 94V-0 flammability rating, with tin-plated leads compliant to MIL-STD-202 Method 208 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500W at 1.0ms 10/1000μs waveform - sustains single high-energy surges without failure |
| Reverse Standoff Voltage (VRWM) | 33.3V - maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 37.1–41.0V @ 1mA - guaranteed avalanche initiation window for reliable clamping onset |
| Max Clamping Voltage (VC) | 53.9V @ 28A IPP - limits protected node voltage during worst-case 1.5kW transient |
| Leakage Current (IR) | ≤5.0μA @ 33.3V - negligible standby power loss and minimal impact on high-impedance circuits |
| Operating Temperature | –55°C to +175°C - qualified for under-hood automotive and industrial environments |
| Package | DO-201 axial lead - standardized through-hole footprint with 9.5mm lead length for 75°C thermal derating |
Pinout & Package
1.5KE39CA-T is a two-terminal bidirectional TVS diode in DO-201 package: no polarity marking required; symmetric terminals enable installation without orientation concern. The package is transfer-molded epoxy with UL 94V-0 rating, 1.12g mass, and axial leads suitable for wave or hand soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Surge current path | Both terminals function identically; bidirectional clamping occurs regardless of voltage polarity |
| Lead (anode side) | Mechanical & thermal interface | Axial lead provides mechanical anchoring and conducts heat to PCB copper during surge dissipation |
| Lead (cathode side) | Mechanical & thermal interface | Identical to anode-side lead; symmetry simplifies layout and eliminates orientation errors |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Ensures stable VBR and low IR over lifetime and temperature cycling, critical for long-term field reliability |
| Bidirectional configuration | Protects AC-coupled or floating lines (e.g., RS-485, CAN, sensor bridges) without polarity constraints |
| 1500W peak pulse rating | Withstands IEC 61000-4-5 Level 4 (4kV/2Ω) surges with margin, reducing need for cascaded protection |
| RoHS-compliant & halogen-free | Meets EU Directive 2015/863/EU with Br+Cl <1500ppm and Sb <1000ppm - supports green manufacturing mandates |
| Fast response time | <1ns turn-on enables clamping before sensitive ICs experience overstress - verified per JEDEC JESD22-A114 |
Applications
| Automotive Power Rail Protection | Industrial RS-485 Interface |
|---|---|
|
Use Scenario: 12V battery line in engine control unit exposed to load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: Primary shunt clamp limiting rail voltage to ≤54V during 100ms, 120V surges. Use Value: Prevents MOSFET gate oxide rupture and microcontroller brownout by holding rail below 55V for >95% of surge duration. |
Use Scenario: Termination point of RS-485 bus in factory automation PLC exposed to EFT (IEC 61000-4-4) and lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional clamping element across differential pair (A/B) referenced to ground. Use Value: Maintains signal integrity by limiting common-mode transients to <60V while preserving DC bias and data eye opening. |
| AC-DC Adapter Input Stage | Smart Meter Sensor Inputs |
|
Use Scenario: Across bridge rectifier output in Class II isolated AC-DC adapter subjected to surge immunity testing (IEC 61000-4-5). IC Role / Device Role / Timing Role: Secondary-side overvoltage clamp absorbing energy from transformer leakage inductance spikes. Use Value: Eliminates need for snubber RC network by dissipating >1.2J per event without degradation over 1000+ cycles. |
Use Scenario: Protection of analog front-end inputs (e.g., current shunt, thermistor) in utility smart meters installed outdoors. IC Role / Device Role / Timing Role: Low-leakage (<5μA) shunt limiter placed before precision ADC input stage. Use Value: Preserves measurement accuracy (±0.1% gain error) while surviving 8kV contact ESD per IEC 61000-4-2 without calibration drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36CA | 600W rating, SMB package, 36V VRWM, 58.1V VC @ 10.3A - lower power, surface-mount | Preferred for space-constrained PCBs where DO-201 axial leads are impractical | Select when board area is limited and surge threat level is ≤IEC 61000-4-5 Level 3 (2kV) |
| 1.5SMC39CA | 1500W rating, SMC package, identical 33.3V VRWM and 53.9V VC - same electrical performance, different footprint | Used where automated pick-and-place and reflow assembly replace through-hole processes | Choose for high-volume production requiring SMT compatibility without compromising clamping performance |
Compared with SMBJ36CA, 1.5KE39CA-T delivers 2.5× higher surge energy handling in a through-hole format; versus 1.5SMC39CA, it trades SMT efficiency for superior mechanical robustness and thermal mass in high-vibration environments.
Availability
1.5KE39CA-T is available at Aetrix Electronics and suitable for automotive power rail protection, industrial RS-485 interface hardening, and AC-DC adapter input stage surge suppression requiring stable component supply across extended product lifecycles.
Supply support for 1.5KE39CA-T 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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The 1.5KE series targets high-reliability transient suppression in automotive, industrial, and consumer power systems - engineered for robustness under repetitive surge stress and wide-temperature operation.
FAQ
Is 1.5KE39CA-T suitable for automotive AEC-Q200 qualification?
No - while Diodes offers AEC-Q200-qualified variants in the same 1.5KE family (e.g., 1.5KE39CAQ), the -T suffix denotes tape-and-reel packaging only and does not imply automotive qualification. This part is standard industrial grade; AEC-Q200 compliance requires explicit part number suffix "Q" and PPAP documentation.
What is the difference between 1.5KE39A and 1.5KE39CA?
1.5KE39A is unidirectional (cathode-banded), clamping only positive transients relative to cathode; 1.5KE39CA is bidirectional, with symmetrical clamping for both polarities. Both share identical VRWM (33.3V), VBR (37.1–41.0V), and VC (53.9V), but CA version lacks cathode marking and supports AC-coupled applications.
Can 1.5KE39CA-T be used in parallel for higher surge current handling?
No - TVS diodes exhibit negative temperature coefficient and mismatched VBR, causing current hogging and thermal runaway when paralleled. For higher current, select a single higher-rated device (e.g., 3KP36CA) or implement staged protection with upstream current-limiting resistors or PTCs.
Does the DO-201 package support automated through-hole insertion?
Yes - the DO-201 axial lead configuration is compatible with standard wave soldering and selective soldering equipment. Lead spacing (25.4mm nominal) and diameter (0.96–1.06mm) meet IPC-7351B through-hole land pattern guidelines, and the 1.12g mass ensures stable placement during conveyor handling.
1.5KE39CA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 28A
- 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-T FAQ
1.How can I place an order for 1.5KE39CA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE39CA-T 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-T reliable?
The price and inventory of 1.5KE39CA-T 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-T is usually 5 days.
3.What payment methods are accepted for 1.5KE39CA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE39CA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE39CA-T?
1.5KE39CA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE39CA-T 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-T?
For technical support, including 1.5KE39CA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE39CA-T requirements.
6.How does Aetrix verify that 1.5KE39CA-T is sourced from the original manufacturer or authorized distributors?
All 1.5KE39CA-T 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-T meets industry standards.
7.What is the process for return or replacement of 1.5KE39CA-T?
All 1.5KE39CA-T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE39CA-T, 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-T part is unused and in its original packaging.
Return procedure for 1.5KE39CA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE39CA-T Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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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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