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Diodes Incorporated 1.5KE51CA-T
- Part No.:
- 1.5KE51CA-T
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE51CA-T.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:3,610
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Product details
Overview
1.5KE51CA-T from Diodes Incorporated is a bidirectional 1500W transient voltage suppressor (TVS) diode in DO-201 package, designed for high-energy surge protection on DC power rails and signal lines. It features a 43.6V reverse standoff voltage, 48.5–53.6V breakdown range at 1mA, 70.1V max clamping voltage at 21.4A peak pulse current, and operates from –55°C to +175°C.
For engineers reviewing the 1.5KE51CA-T datasheet, 1.5KE51CA-T pinout, 1.5KE51CA-T application, or 1.5KE51CA-T equivalent, this device is selected for robust overvoltage protection in automotive power systems, industrial I/O interfaces, and telecom line cards where fast response (<1 ns), low leakage (<5 µA @ 43.6V), and stable temperature coefficient (0.102%/°C) are critical.
Technical Context
This bidirectional TVS diode uses a glass-passivated silicon junction to achieve symmetrical clamping behavior in both polarities, enabling protection of AC-coupled or floating circuits without polarity constraints. Its 1500W peak pulse power rating (1ms exponential decay) supports IEC 61000-4-5 Level 4 surge immunity compliance.
The device exhibits excellent clamping ratio (VC/VBR ≈ 1.45) and low dynamic impedance (~3.3 Ω), ensuring minimal let-through voltage during transients. Its axial-leaded DO-201 package provides mechanical robustness and thermal path suitability for PCB-mounted surge suppression with 5.0W steady-state dissipation at TL = 75°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W - Withstands 1ms 8/20µs surges up to 21.4A without failure |
| Reverse Standoff Voltage | 43.6 V - Maximum continuous DC or RMS voltage before significant leakage |
| Breakdown Voltage Range | 48.5–53.6 V @ 1mA - Confirmed conduction onset window for reliable triggering |
| Max Clamping Voltage | 70.1 V @ 21.4A - Upper limit of voltage seen by protected circuit during worst-case surge |
| Leakage Current | <5 µA @ 43.6V - Negligible standby power loss and no false triggering in low-power systems |
| Operating Temperature | –55°C to +175°C - Validated performance across automotive under-hood and industrial ambient extremes |
| Temp Coefficient | 0.102 %/°C - Predictable VBR drift enables accurate margining in wide-temperature designs |
Pinout & Package
Package: DO-201 axial-leaded epoxy package (25.4 mm length, 4.8–5.21 mm diameter), UL 94V-0 rated, moisture sensitivity level 1, tin-plated leads solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bidirectional terminals | No polarity marking required; symmetric clamping in either direction |
| Lead 1 / Lead 2 | Current path terminals | Axial leads provide mechanical strain relief and direct PCB trace routing for low-inductance placement |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Enhanced reliability and long-term stability under repeated surge stress |
| Bidirectional clamping symmetry | Enables single-device protection of AC signals or ungrounded buses without polarity concerns |
| Fast response time (<1 ns) | Clamps transients before sensitive downstream ICs experience damaging overvoltage |
| RoHS-compliant, halogen-free "Green" design | Meets environmental compliance requirements for automotive and industrial end equipment |
| 1.12 g mass, axial lead form factor | Compatible with standard through-hole assembly and manual rework; minimal board space footprint |
Applications
| Automotive Power Distribution | Industrial PLC Analog Inputs |
|---|---|
Use Scenario: Protecting 12V/24V battery-fed ECUs against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converters and microcontrollers. Use Value: Limits transient voltage to ≤70.1V, preventing latch-up or gate oxide damage in 3.3V/5V logic domains. |
Use Scenario: Safeguarding 4–20mA current loop receivers from field-wiring induced surges. IC Role / Device Role / Timing Role: Bidirectional shunt protector across input terminals of precision op-amp front-ends. Use Value: Maintains signal integrity below 1 LSB error by clamping <100ns transients before ADC sampling. |
| Telecom Line Interface Cards | Renewable Energy Inverter Control Boards |
Use Scenario: Shielding Ethernet PHYs and PoE controllers from lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Secondary-level TVS on isolated data lines after primary gas discharge tube (GDT) stage. Use Value: Provides sub-100V clamping with <5 µA leakage, preserving Ethernet link integrity and EMI performance. |
Use Scenario: Guarding MCU GPIOs and gate drivers in solar inverter control units exposed to grid switching transients. IC Role / Device Role / Timing Role: Localized clamping at microcontroller I/O pins and isolated gate driver inputs. Use Value: Ensures functional safety by limiting transient energy to <1 mJ per event, avoiding firmware reset or brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA | 600W rating, SMC package, lower 51V clamping (83.5V), 17.5A IPP | Lower power handling; suited for space-constrained PCBs with moderate surge exposure | Select when board area is limited and IEC 61000-4-5 Level 3 (1kV/42Ω) suffices |
| 1.5SMC51CA | Same 1500W rating but SMC surface-mount package; identical electrical specs | Requires reflow-compatible layout; eliminates axial lead hole drilling and wave-solder process | Choose for automated SMT production and improved vibration resistance in mobile equipment |
Compared with 1.5KE51CA-T, SMBJ51CA offers smaller size but reduced surge capacity, while 1.5SMC51CA delivers identical protection in a surface-mount format-enabling trade-offs between manufacturability, board space, and mechanical ruggedness.
Availability
1.5KE51CA-T is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC analog inputs, and telecom line interface cards requiring stable component supply and long-lifecycle support.
Supply support for 1.5KE51CA-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 manufacturing certified to IATF 16949 and quality systems aligned to AEC-Q200 for passive components.
This part belongs to the 1.5KE series of high-power axial TVS diodes, engineered specifically for demanding surge environments in automotive, industrial, and infrastructure applications where reliability under repetitive transient stress is mandatory.
FAQ
Is 1.5KE51CA-T RoHS and REACH compliant?
Yes. The 1.5KE51CA-T meets EU Directive 2011/65/EU (RoHS 2) and 2015/863/EU (RoHS 3), with lead-free finish and halogen/antimony content below defined thresholds (<900 ppm Br, <900 ppm Cl, <1000 ppm Sb). Full compliance documentation is available via Diodes Incorporated's quality portal.
What is the maximum operating temperature for continuous use?
The device is rated for continuous operation from –55°C to +175°C junction temperature. At ambient temperatures above +75°C, derating applies: steady-state power dissipation drops linearly from 5.0W at TL = 75°C to zero at +175°C, per the thermal resistance curve in DS21503 Rev. 12.
Can 1.5KE51CA-T replace unidirectional 1.5KE51A-T in existing designs?
No. The 'C' suffix denotes bidirectional construction; 1.5KE51A-T is unidirectional with cathode band marking and asymmetric clamping. Substitution requires verifying circuit polarity, grounding scheme, and transient directionality-especially in DC-biased rails where reverse conduction could cause malfunction.
Does this part meet AEC-Q200 qualification for automotive use?
While manufactured in IATF 16949-certified facilities and commonly used in automotive applications, the 1.5KE51CA-T itself is not individually AEC-Q200 qualified. For AEC-Q200-compliant alternatives, Diodes offers the P6SMBJ51CA-Q series-contact Aetrix Electronics for qualified drop-in replacements.
1.5KE51CA-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):
- 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
1.5KE51CA-T FAQ
1.How can I place an order for 1.5KE51CA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE51CA-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 1.5KE51CA-T reliable?
The price and inventory of 1.5KE51CA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE51CA-T is usually 5 days.
3.What payment methods are accepted for 1.5KE51CA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE51CA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE51CA-T?
1.5KE51CA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE51CA-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 1.5KE51CA-T?
For technical support, including 1.5KE51CA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE51CA-T requirements.
6.How does Aetrix verify that 1.5KE51CA-T is sourced from the original manufacturer or authorized distributors?
All 1.5KE51CA-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 1.5KE51CA-T meets industry standards.
7.What is the process for return or replacement of 1.5KE51CA-T?
All 1.5KE51CA-T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE51CA-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 1.5KE51CA-T part is unused and in its original packaging.
Return procedure for 1.5KE51CA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE51CA-T Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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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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DESD5V0U1BB-7
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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