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Diodes Incorporated 1.5KE43CA-T
- Part No.:
- 1.5KE43CA-T
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE43CA-T.pdf
- Description:
- TVS DIODE 36.8VWM 59.3VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:7,065
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Product details
Overview
1.5KE43CA-T from Diodes Incorporated is a bidirectional 1500W transient voltage suppressor (TVS) diode in DO-201 package, designed for overvoltage protection of DC power rails and signal lines. It features a 36.8V reverse standoff voltage, 40.9V minimum breakdown voltage at 1mA test current, 59.3V maximum clamping voltage at 25.3A peak pulse current, and operates across –55°C to +175°C.
For engineers reviewing the 1.5KE43CA-T datasheet, 1.5KE43CA-T pinout, 1.5KE43CA-T application, or 1.5KE43CA-T equivalent, this device serves as a robust, RoHS-compliant, halogen-free surge protector for automotive power systems, industrial I/O interfaces, and telecom line cards where fast response (<1ns), low clamping ratio (1.45× VRWM), and high surge immunity are required.
Technical Context
This bidirectional TVS diode uses glass-passivated silicon junctions to achieve sub-nanosecond response time and stable clamping under repetitive 8.3ms half-sine surges up to 200A forward surge current. Its symmetrical avalanche structure enables identical clamping in both polarities without external polarity management.
The device is rated for 1500W peak pulse power (tP = 1.0ms), with a temperature coefficient of VBR at +0.101%/°C and 5.0W steady-state dissipation at TL = 75°C. Axial leads meet MIL-STD-202 solderability requirements and support through-hole mounting on high-reliability PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500W at 1.0ms pulse - sustains IEEE C62.41-compliant surge events without degradation |
| Reverse Standoff Voltage (VRWM) | 36.8V - maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 40.9V min @ 1mA - precise avalanche initiation threshold for predictable clamping onset |
| Clamping Voltage (VC) | 59.3V max @ 25.3A - limits protected circuit voltage during worst-case surge |
| Peak Pulse Current (IPP) | 25.3A - maximum non-repetitive surge current the device can safely divert |
| Operating Temperature | –55°C to +175°C - supports under-hood automotive and industrial environments |
| Leakage Current (IR) | 5.0μA max @ 36.8V - ensures minimal standby power loss in always-on systems |
Pinout & Package
Package: DO-201 axial-leaded, transfer-molded epoxy housing (UL 94V-0), 1.12g weight, moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Current entry terminal in forward bias | Connected to lower-potential side of protected node; forms symmetrical clamp path with Cathode |
| Cathode (Lead 2) | Current exit terminal in forward bias | Connected to higher-potential side; bidirectional operation means either lead may serve as reference depending on transient polarity |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Enables stable, low-noise avalanche behavior and long-term reliability under thermal cycling |
| Bidirectional configuration (suffix "C") | Eliminates need for polarity-aware layout; protects AC-coupled or floating nodes without external diodes |
| RoHS-compliant, halogen- and antimony-free | Meets automotive and industrial environmental compliance (Br+Cl <1500ppm, Sb <1000ppm) |
| Fast response time | Sub-nanosecond turn-on ensures clamping occurs before downstream ICs experience overstress |
| Axial lead solderability | MIL-STD-202 Method 208 qualified - supports automated through-hole assembly and rework |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting 24V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed directly across input terminals of power management ICs. Use Value: Clamps 120V/100ms transients to ≤59.3V within nanoseconds, preventing damage to LDOs and microcontrollers. |
Use Scenario: Shielding 24V digital input modules from field-wiring induced surges (IEC 61000-4-5 Level 3). IC Role / Device Role / Timing Role: Front-end surge absorber ahead of optocoupler or Schmitt-trigger input stages. Use Value: Absorbs 1kV/500A ring-wave surges without latch-up, preserving signal integrity and system uptime. |
| Telecom Line Interface | Medical Equipment Power Entry |
|
Use Scenario: Safeguarding RS-485 transceivers connected to outdoor cabling exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Common-mode TVS on differential pair, referenced to chassis ground. Use Value: Limits common-mode voltage excursion to <60V, maintaining transceiver common-mode range and avoiding data corruption. |
Use Scenario: Secondary-level protection on AC/DC adapter outputs feeding sensitive analog front-ends in diagnostic imaging systems. IC Role / Device Role / Timing Role: Final-stage rail clamp after primary MOV and fuse, ensuring clean 5V/12V supply to ADCs and sensors. Use Value: Provides low-leakage (<5μA), high-temperature-stable clamping critical for low-drift medical signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43CA | 600W rating, SMB surface-mount package, 64.5V clamping at 9.3A | Lower power handling; suited for space-constrained PCBs but not for 1500W surge events | Select when board area is limited and surge energy is ≤600W; verify thermal pad layout for sustained dissipation |
| 1.5SMC43CA | Same 1500W rating, SMC package, 64.5V clamping at 23.4A, 1.5x larger footprint than DO-201 | Higher thermal mass; better for repeated surges but requires more PCB real estate | Prefer for high-cycle industrial environments where DO-201 lead fatigue is a concern |
Compared with SMBJ43CA and 1.5SMC43CA, the 1.5KE43CA-T delivers identical 1500W surge capability in a legacy axial form factor optimized for manual assembly, high-voltage creepage, and mechanical robustness-making it ideal for prototyping, repair, and high-reliability through-hole designs where lead integrity matters.
Availability
1.5KE43CA-T is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, and telecom line interface applications requiring stable component supply and long-lifecycle support.
Supply support for 1.5KE43CA-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, serving automotive, industrial, computing, and consumer markets with high-reliability components.
The 1.5KE series targets high-energy transient suppression in harsh environments, emphasizing rugged packaging, wide temperature operation, and AEC-Q200-aligned manufacturing-designed specifically for mission-critical overvoltage protection in automotive and industrial systems.
FAQ
Is 1.5KE43CA-T still in active production?
No-1.5KE43CA-T is marked obsolete per Diodes Incorporated's DS21503 Rev. 12 (May 2023). However, Aetrix Electronics maintains legacy inventory and offers cross-support guidance for migration to functionally aligned alternatives like 1.5SMC43CA or SMBJ43CA with verified clamping and thermal performance.
What does the "C" suffix indicate in 1.5KE43CA-T?
The "C" denotes bidirectional configuration: the device clamps symmetrically for both positive and negative transients, eliminating polarity dependence. This differs from unidirectional variants (e.g., 1.5KE43A-T), which require correct anode/cathode orientation relative to ground.
Can 1.5KE43CA-T replace 1.5KE43A-T in existing designs?
Only if the circuit is inherently symmetrical or referenced to floating grounds. Unidirectional 1.5KE43A-T provides clamping only from cathode to anode; substituting the bidirectional version introduces conduction in reverse bias, potentially disrupting bias networks or causing unintended current paths in DC-coupled circuits.
What is the significance of the "-T" suffix in the part number?
The "-T" indicates tape-and-reel packaging: 1,000 units per 13-inch reel, optimized for automated pick-and-place assembly. This contrasts with "-B" (bulk packaging), which is intended for manual or semi-automated insertion processes.
1.5KE43CA-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):
- 36.8V
- Voltage - Breakdown (Min):
- 40.9V
- Voltage - Clamping (Max) @ Ipp:
- 59.3V
- Current - Peak Pulse (10/1000µs):
- 25.3A
- 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
1.5KE43CA-T FAQ
1.How can I place an order for 1.5KE43CA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE43CA-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 1.5KE43CA-T reliable?
The price and inventory of 1.5KE43CA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE43CA-T is usually 5 days.
3.What payment methods are accepted for 1.5KE43CA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE43CA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE43CA-T?
1.5KE43CA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE43CA-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 1.5KE43CA-T?
For technical support, including 1.5KE43CA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE43CA-T requirements.
6.How does Aetrix verify that 1.5KE43CA-T is sourced from the original manufacturer or authorized distributors?
All 1.5KE43CA-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 1.5KE43CA-T meets industry standards.
7.What is the process for return or replacement of 1.5KE43CA-T?
All 1.5KE43CA-T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE43CA-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 1.5KE43CA-T part is unused and in its original packaging.
Return procedure for 1.5KE43CA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE43CA-T Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
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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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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