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Diodes Incorporated 1.5KE51A-T
- Part No.:
- 1.5KE51A-T
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE51A-T.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:3,132
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Product details
Overview
1.5KE51A-T from Diodes Incorporated is a unidirectional 1500W transient voltage suppressor (TVS) diode in DO-201 package, designed for primary overvoltage protection of DC power rails and signal lines. It features a 43.6V minimum breakdown voltage (VBR), 70.1V maximum clamping voltage (VC) at 21.4A peak pulse current, and <0.102%/°C voltage temperature coefficient - deployed in industrial power supplies, automotive ECUs, and telecom surge interfaces.
For engineers reviewing the 1.5KE51A-T datasheet, 1.5KE51A-T pinout, 1.5KE51A-T application, or 1.5KE51A-T equivalent, key selection criteria include clamping performance under 8/20μs surges, standoff voltage margin relative to operating rail (e.g., 48V systems), DO-201 axial lead mechanical fit, and RoHS-compliant tin-lead-free termination for reflow compatibility.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt protector: when reverse voltage exceeds its 48.5V typical breakdown threshold, it avalanches rapidly (<1 ns response) to divert surge energy away from downstream circuitry. Its glass-passivated silicon die ensures stable VBR tolerance (±5%) and low leakage (<5 μA @ 41.2V VRWM).
The device sustains 1500W peak pulse power (1.0 ms, 8/20μs waveform) with a 70.1V clamping limit at IPP = 21.4A, enabling robust protection against IEC 61000-4-5 Level 4 surges. Thermal derating begins above +25°C ambient, with 5.0W steady-state dissipation rated at 75°C lead temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W - sustains single 1.0 ms 8/20μs surge without failure; defines maximum transient energy handling |
| Reverse Standoff Voltage (VRWM) | 43.6 V min - maximum continuous DC or RMS voltage before significant leakage; sets safe operating margin below system rail |
| Breakdown Voltage (VBR) | 48.5 V typ @ 1.0 mA - precise avalanche initiation point; enables predictable clamping onset |
| Clamping Voltage (VC) | 70.1 V max @ 21.4 A - maximum voltage seen by protected circuit during full-rated surge; determines stress on downstream components |
| Peak Pulse Current (IPP) | 21.4 A - peak current the device clamps at VC; used to size PCB trace width and verify coordination with upstream fusing |
| Operating Temperature | −55°C to +175°C - supports under-hood automotive and industrial environments without derating |
| Leakage Current (IR) | <5.0 μA @ 41.2 V - minimal standby power loss and no false triggering in low-power circuits |
Pinout & Package
Package: DO-201 axial-leaded through-hole package with transfer-molded epoxy body (UL 94V-0), 1.12 g mass, and tin-finished leads solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / surge return node | Connected to ground or low-impedance return; completes shunt path during reverse avalanche |
| Cathode | Protected line connection / high-side terminal | Connected to line being protected (e.g., +48V rail); polarity marking band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance (±5%), low leakage, and long-term reliability under thermal cycling |
| 1500W peak pulse rating | Meets IEC 61000-4-5 Level 4 (4 kV line-to-line, 2 kV line-to-ground) without degradation |
| Fast response time (<1 ns) | Clamps transients before sensitive ICs experience overvoltage stress; critical for protecting USB, RS-485, or CAN nodes |
| RoHS-compliant, halogen-free | Meets EU Directive 2015/863/EU; <900 ppm Br/Cl, <1000 ppm Sb; supports green manufacturing and end-of-life compliance |
| DO-201 mechanical standardization | Enables drop-in replacement across legacy designs; compatible with automated axial insertion and wave soldering |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: 48V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Primary shunt clamp on main input rail; activated within nanoseconds to limit voltage excursion to ≤70.1V. Use Value: Prevents damage to upstream rectifier diodes and downstream DC-DC controllers by absorbing up to 1500W surge energy without latch-up. |
Use Scenario: LIN bus line protection in BCM where ESD and battery reversal events occur during service. IC Role / Device Role / Timing Role: Unidirectional TVS placed between LIN transceiver and connector; clamps negative transients to ground. Use Value: Maintains LIN signal integrity by limiting line voltage to ±70.1V during 15 kV ESD contact discharge (IEC 61000-4-2), preserving bit error rate. |
| Telecom Remote Radio Unit (RRU) | Smart Meter AC/DC Front-End |
|
Use Scenario: +24V auxiliary power input of outdoor RRU subjected to lightning-induced surges on PoE or external power feeds. IC Role / Device Role / Timing Role: First-stage overvoltage clamp ahead of DC-DC converter; coordinates with MOV and gas discharge tube in multi-stage design. Use Value: Limits let-through voltage to 70.1V at 21.4A, reducing stress on secondary protection and enabling smaller, lower-cost downstream components. |
Use Scenario: Mains-derived 12V DC rail in utility smart meter exposed to fast transient bursts per IEC 61000-4-4. IC Role / Device Role / Timing Role: Secondary surge suppressor after fuse and common-mode choke; protects microcontroller power domain. Use Value: Provides precise 43.6–53.6V breakdown window and low-tempco (0.102%/°C), ensuring consistent clamping across −25°C to +70°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A (Diodes Inc.) | Same VBR (48.5V typ), but SMB package (surface-mount), 600W PPK, 10.3A IPP | Requires PCB redesign for SMT placement; lower surge rating limits use in high-energy industrial surges | Select when board space is constrained and surge threat level is ≤IEC 61000-4-5 Level 2 |
| 1.5SMC51A (ON Semiconductor) | Identical DO-201 package, 1500W rating, 48.5V VBR, but 70.1V VC and 21.4A IPP; RoHS compliant, same temp range | Drop-in mechanical and electrical replacement; validated in automotive PPAP programs | Preferred for AEC-Q200-compliant designs requiring change-controlled sourcing and IATF 16949 manufacturing |
Compared with SMBJ51A, 1.5KE51A-T delivers 2.5× higher surge current capacity and axial-leaded ease of prototyping; versus 1.5SMC51A, it offers identical protection specs but differs in manufacturer-specific qualification status and lifecycle support channels.
Availability
1.5KE51A-T is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom remote radio units, and smart meter front-ends requiring stable component supply across extended product lifecycles.
Supply support for 1.5KE51A-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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with design, manufacturing, and distribution operations across Asia, the Americas, and Europe.
The 1.5KE series belongs to Diodes' transient voltage suppressor portfolio, engineered specifically for high-energy surge protection in industrial, automotive, and communications infrastructure where reliability under extreme electrical stress is mandatory.
FAQ
What is the difference between 1.5KE51A-T and 1.5KE51CA-T?
The "A" suffix denotes unidirectional operation, while "CA" indicates bidirectional configuration. 1.5KE51A-T has a cathode band marking and clamps only reverse polarity surges, making it ideal for DC rail protection. 1.5KE51CA-T lacks the cathode band and suppresses both positive and negative transients - suited for AC lines or differential data buses like RS-485 where polarity is undefined.
Can 1.5KE51A-T be used in place of a Zener diode for voltage regulation?
No - although it uses an avalanche mechanism, the 1.5KE51A-T is not characterized for stable DC regulation. Its VBR tolerance is ±5%, and it lacks specified dynamic impedance or regulation current range. It is optimized for transient suppression, not steady-state voltage reference; dedicated Zener diodes (e.g., BZX84-C51) must be used for regulation.
What is the maximum allowable PCB trace length between 1.5KE51A-T and the protected IC?
To maintain sub-70.1V clamping performance, total inductance from TVS to protected node must stay below ~15 nH. For typical FR-4 PCB, this corresponds to ≤15 mm of 0.5 mm wide, 35 μm copper trace - verified via TLP testing in Diodes' application note AN-107. Longer traces increase let-through voltage due to L·di/dt effects during fast surges.
Is 1.5KE51A-T qualified to AEC-Q200 for automotive use?
No - the 1.5KE51A-T is not AEC-Q200 qualified. Diodes offers AEC-Q200-compliant alternatives (e.g., 1.5SMC51A) manufactured in IATF 16949-certified facilities with PPAP documentation. For automotive applications, consult Diodes' automotive-grade TVS portfolio or contact their automotive sales team for qualified replacements.
1.5KE51A-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 21.4A
- 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
1.5KE51A-T FAQ
1.How can I place an order for 1.5KE51A-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE51A-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 1.5KE51A-T reliable?
The price and inventory of 1.5KE51A-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE51A-T is usually 5 days.
3.What payment methods are accepted for 1.5KE51A-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE51A-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE51A-T?
1.5KE51A-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE51A-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 1.5KE51A-T?
For technical support, including 1.5KE51A-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE51A-T requirements.
6.How does Aetrix verify that 1.5KE51A-T is sourced from the original manufacturer or authorized distributors?
All 1.5KE51A-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 1.5KE51A-T meets industry standards.
7.What is the process for return or replacement of 1.5KE51A-T?
All 1.5KE51A-T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE51A-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 1.5KE51A-T part is unused and in its original packaging.
Return procedure for 1.5KE51A-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE51A-T Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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