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Littelfuse Inc. 1.5KE350A-B
- Part No.:
- 1.5KE350A-B
- Manufacturer:
- Littelfuse Inc.
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE350A-B.pdf
- Description:
- TVS DIODE 300VWM 482VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:4,447
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Product details
Overview
1.5KE350A-B from Diodes Incorporated is a unidirectional 1500W transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power lines and signal interfaces. It features a 300V reverse standoff voltage (VRWM), 332–368V breakdown range (VBR), 482V clamping voltage (VC) at 4.0A peak pulse current, and DO-201 axial package. Used in industrial power supplies to absorb lightning-induced surges on 277V AC-derived DC rails.
For engineers reviewing the 1.5KE350A-B datasheet, 1.5KE350A-B pinout, 1.5KE350A-B application, or 1.5KE350A-B equivalent, key selection criteria include clamping ratio (VC/VBR ≈ 1.45), temperature coefficient of VBR (+0.110%/°C), unidirectional polarity marking (cathode band), and compliance with IEC 61000-4-5 Level 4 surge immunity requirements.
Technical Context
This TVS operates as a voltage-clamped shunt protector: under normal bias it presents <5μA leakage at VRWM = 300V; during transients exceeding VBR (min 332V), it avalanches rapidly (<1ns response) to clamp the line at ≤482V. Its glass-passivated junction ensures stable breakdown and low capacitance for high-speed surge suppression.
The device is rated for 1500W peak pulse power (10/1000μs waveform), derated above +25°C ambient, with steady-state dissipation of 5.0W at TL = 75°C. It supports 200A non-repetitive forward surge current and operates from –55°C to +175°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500W (10/1000μs waveform; defines maximum transient energy absorption capability) |
| Reverse Standoff Voltage | 300V (maximum continuous DC or RMS voltage before significant leakage begins) |
| Breakdown Voltage Range | 332–368V (VBR tested at 1mA; ensures reliable avalanche initiation across process variation) |
| Clamping Voltage | 482V at 4.0A IPP (maximum voltage seen by protected circuit during specified surge) |
| Leakage Current | ≤5.0μA at VRWM = 300V (low standby power loss and minimal loading on source) |
| Operating Temperature | –55°C to +175°C (enables use in under-hood automotive or industrial environments) |
| VBR Tempco | +0.110%/°C (predictable voltage drift with temperature; critical for precision clamping) |
Pinout & Package
Package: DO-201 axial leaded epoxy package (25.4mm length, 4.8–5.21mm diameter), UL 94V-0 rated, with tin-plated leads solderable per MIL-STD-202 Method 208. Marked with part number and cathode band for unidirectional polarity identification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or return path; establishes reference for clamping action |
| Cathode | High-side surge input terminal | Connected to protected line; avalanche conduction occurs from cathode to anode during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| 1500W peak pulse rating | Supports IEC 61000-4-5 4kV/2Ω combination wave testing without failure |
| Fast response time | <1ns turn-on enables protection of downstream MOSFETs and ICs against ESD and lightning surges |
| RoHS-compliant & halogen-free | Meets EU Directive 2015/863/EU with Br+Cl <1500ppm and Sb <1000ppm for green manufacturing |
| DO-201 mechanical robustness | 1.12g mass and axial lead geometry provide vibration resistance and secure PCB mounting in industrial controls |
Applications
| AC/DC Power Supply Input Protection | Industrial Motor Drive DC Bus Clamping |
|---|---|
|
Use Scenario: 277V AC-fed industrial LED driver with rectified DC bus exposed to utility switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between +DC bus and chassis ground to clamp positive-going surges. Use Value: Limits transient voltage to ≤482V, preventing damage to 600V-rated bulk capacitors and PFC controller ICs. |
Use Scenario: 400V DC bus in variable-frequency drive feeding 3-phase induction motor. IC Role / Device Role / Timing Role: Primary surge absorber on main DC link, triggered by IGBT commutation spikes or load dump events. Use Value: Absorbs up to 1500W for 1ms, suppressing voltage overshoot that could exceed IGBT blocking rating. |
| Telecom Central Office Power Feeds | Railway Signaling Interface Protection |
|
Use Scenario: –48V DC telecom power distribution board subject to induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Unidirectional clamping device on feed line to protect upstream DC-DC converters and monitoring ICs. Use Value: Maintains <5μA leakage at nominal –48V, ensuring no impact on battery backup runtime while clamping to safe levels. |
Use Scenario: 110V DC signaling interface between trackside sensors and interlocking control unit. IC Role / Device Role / Timing Role: Line-to-ground TVS on each signal pair to meet EN 50121-4 rail EMC immunity requirements. Use Value: Withstands repeated 1kV/500Ω surges per IEC 61000-4-5, preserving signal integrity in safety-critical systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ350A | Same VRWM (350V), lower PPK (600W), smaller SMB package (surface-mount) | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 | Select when board space is constrained and surge threat level is ≤1kV/42Ω |
| 1.5SMC350A | Same VRWM and PPK, but SMC package (larger than DO-201, higher thermal mass) | Better thermal dissipation for repetitive surges; requires larger PCB footprint | Prefer for high-duty-cycle industrial environments where DO-201 lead thermal resistance is limiting |
Compared with SMBJ350A and 1.5SMC350A, the 1.5KE350A-B delivers identical clamping performance in a legacy axial package optimized for through-hole mounting and high-reliability manual assembly-making it ideal for field-replaceable modules and ruggedized power entry designs.
Availability
1.5KE350A-B is available at Aetrix Electronics and suitable for industrial power supplies, railway signaling interfaces, and telecom central office equipment requiring stable component supply and long-lifecycle support.
Supply support for 1.5KE350A-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 design centers in Asia, Europe, and the US and manufacturing in IATF 16949-certified facilities.
The 1.5KE series targets high-energy transient suppression in industrial, telecom, and transportation infrastructure, emphasizing robustness, wide operating temperature range, and compliance with international surge immunity standards.
FAQ
What is the polarity configuration of the 1.5KE350A-B?
The "A" suffix denotes unidirectional operation, and the "-B" suffix indicates bulk packaging. The device has a cathode band marking on the body; the cathode must be connected to the protected line and the anode to ground. Bidirectional variants use the "C" suffix (e.g., 1.5KE350CA).
Can the 1.5KE350A-B be used in automotive applications?
While not AEC-Q200 qualified, the 1.5KE350A-B operates from –55°C to +175°C and meets RoHS/halogen-free requirements. For automotive use, Diodes recommends contacting their sales team for PPAP-capable, IATF 16949-manufactured alternatives with formal qualification.
How does the clamping voltage relate to system protection margin?
With VC = 482V at IPP = 4.0A, the device limits transient voltage to 482V - 38% above its 300V standoff rating. This provides 118V headroom below a typical 600V-rated MOSFET's absolute maximum drain-source voltage, enabling reliable protection without overstressing downstream components.
Is the DO-201 package compatible with automated through-hole insertion?
Yes - the DO-201 axial package has standardized 9.5mm lead length and 0.96–1.06mm lead diameter, meeting IPC-7351 guidelines for automated insertion. Its 1.12g mass and epoxy body ensure stability during wave soldering and post-assembly handling.
1.5KE350A-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 300V
- Voltage - Breakdown (Min):
- 332V
- Voltage - Clamping (Max) @ Ipp:
- 482V
- Current - Peak Pulse (10/1000µs):
- 3.2A
- 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
1.5KE350A-B FAQ
1.How can I place an order for 1.5KE350A-B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE350A-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 1.5KE350A-B reliable?
The price and inventory of 1.5KE350A-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE350A-B is usually 5 days.
3.What payment methods are accepted for 1.5KE350A-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE350A-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE350A-B?
1.5KE350A-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE350A-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 1.5KE350A-B?
For technical support, including 1.5KE350A-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE350A-B requirements.
6.How does Aetrix verify that 1.5KE350A-B is sourced from the original manufacturer or authorized distributors?
All 1.5KE350A-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 1.5KE350A-B meets industry standards.
7.What is the process for return or replacement of 1.5KE350A-B?
All 1.5KE350A-B units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE350A-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 1.5KE350A-B part is unused and in its original packaging.
Return procedure for 1.5KE350A-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE350A-B Tags
-
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.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
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