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Diodes Incorporated 1.5KE27CA-T
- Part No.:
- 1.5KE27CA-T
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE27CA-T.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:6,121
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Product details
Overview
1.5KE27CA-T from Diodes Incorporated is a bidirectional transient voltage suppressor (TVS) diode in DO-201 package, designed for high-energy surge protection in DC power lines and signal interfaces. It delivers 1500W peak pulse power dissipation at 1.0ms, clamps transients to ≤37.5V at 40A peak pulse current, and maintains a 23.1–28.4V breakdown voltage range with ±5% tolerance at 1mA test current.
For engineers reviewing the 1.5KE27CA-T datasheet, 1.5KE27CA-T pinout, 1.5KE27CA-T application, or 1.5KE27CA-T equivalent, key selection criteria include clamping voltage margin relative to protected IC VMAX, standoff voltage compatibility with system operating voltage, thermal derating above +25°C, and axial lead mechanical integration in legacy PCB layouts.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling robust ESD and lightning-induced surge suppression without polarity sensitivity. Its glass-passivated junction ensures stable leakage (<5μA @ 23.1V) and repeatable breakdown behavior over temperature (−55°C to +175°C).
The device uses a single-junction avalanche structure optimized for fast response (<1.0ns), low dynamic impedance, and minimal capacitance-critical for protecting high-speed analog inputs and automotive power rails where overshoot must be limited below 37.5V under 40A 8/20μs surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500W at 1.0ms - sustains single high-energy surges without failure in industrial power supplies |
| Breakdown Voltage (VBR) | 25.7V min / 28.4V max @ 1mA - defines reliable conduction onset for overvoltage events |
| Clamping Voltage (VC) | 37.5V @ 40A IPP - maximum voltage seen by downstream circuit during worst-case surge |
| Reverse Standoff (VRWM) | 23.1V - maximum continuous DC voltage before leakage exceeds 5μA; sets safe operating margin |
| Leakage Current | ≤5μA @ 23.1V - negligible standby power loss and no false triggering in low-power systems |
| Operating Temperature | −55°C to +175°C - supports under-hood automotive and industrial environments without derating |
Pinout & Package
Package: DO-201 axial-leaded through-hole package with transfer-molded epoxy body (UL 94V-0), 1.12g mass, and tin-finished leads solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during negative transients | One end of symmetrical junction; no cathode marking on bidirectional variant |
| Cathode | Current entry point during positive transients | Other end of symmetrical junction; device marked with type number only (no band) |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints |
| Glass-passivated die | Ensures long-term stability of VBR and leakage under thermal cycling and humidity stress |
| 1500W peak pulse rating | Meets IEC 61000-4-5 Level 4 (4kV line-to-line) surge immunity requirements |
| Axial lead form factor | Supports manual rework, wave soldering, and mechanical strain relief in high-vibration environments |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 12V battery rail in engine control units exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of LDOs and microcontrollers. Use Value: Limits transients to ≤37.5V, preserving 40V-rated input stages while surviving 1500W pulses without degradation. |
Use Scenario: Analog sensor inputs (4–20mA, 0–10V) in factory-floor controllers subject to EFT and surge coupling. IC Role / Device Role / Timing Role: Front-end transient absorber before precision op-amps and ADC drivers. Use Value: Sub-1ns response prevents latch-up in instrumentation amplifiers; low leakage avoids signal offset errors. |
| DC Power Supply Input Stage | Telecom Line Interface |
Use Scenario: Secondary-side 24V DC output of industrial SMPS feeding motor drives and HMI panels. IC Role / Device Role / Timing Role: Bulk surge limiter parallel to bulk capacitor, coordinated with MOV and fuse. Use Value: Clamps 8/20μs surges to 37.5V before they propagate to downstream regulators, reducing need for oversized capacitors. |
Use Scenario: Low-voltage data lines (RS-485, CAN) entering building infrastructure with external cable exposure. IC Role / Device Role / Timing Role: Bidirectional shunt protector on differential pair, referenced to local ground. Use Value: Symmetric clamping preserves common-mode rejection ratio; 23.1V standoff avoids interference with 24V bias networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA | Lower 600W peak power; SMC package; 24V standoff; 38.9V clamping @ 15.4A | Suitable for space-constrained PCBs but requires higher IPP derating for same surge energy | Select when board area is critical and surge threat level is ≤Level 3 (2kV) |
| 1.5SMC27CA | Same 1500W rating and 27V nominal; SMC surface-mount package; identical VRWM/VC specs | Replaces 1.5KE27CA-T in automated assembly; lacks axial lead mechanical robustness | Choose for high-volume SMT production where manual rework is not required |
Compared with SMBJ24CA and 1.5SMC27CA, the 1.5KE27CA-T provides superior mechanical reliability in vibration-prone environments due to its axial leads and higher surge endurance margin, while maintaining identical electrical protection thresholds for 24V systems.
Availability
1.5KE27CA-T is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, and DC power supply input stage applications requiring stable component supply and long-lifecycle support.
Supply support for 1.5KE27CA-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 product qualification to AEC-Q101 for automotive-grade components.
The 1.5KE series belongs to Diodes' transient voltage suppressor portfolio, engineered specifically for high-reliability surge protection in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What does the "CA" suffix indicate in 1.5KE27CA-T?
The "CA" suffix denotes a bidirectional configuration: the device clamps overvoltage transients of either polarity symmetrically, with no cathode marking on the DO-201 body. This differs from unidirectional "A" variants, which feature a cathode band and conduct only in reverse bias.
Is 1.5KE27CA-T compliant with RoHS and halogen-free standards?
Yes. The device carries a lead-free finish compliant with EU RoHS directives 2002/95/EC, 2011/65/EU, and 2015/863/EU, and is classified as "Green" - containing <900ppm bromine, <900ppm chlorine, and <1000ppm antimony compounds per Diodes' definition.
Can 1.5KE27CA-T replace 1.5KE27A-T in an existing design?
No - 1.5KE27A-T is unidirectional and will not protect against negative-going transients. Substitution requires verifying system polarity, revising layout for bidirectional symmetry, and confirming that the 23.1V standoff voltage remains compatible with the protected circuit's minimum operating voltage.
What is the maximum steady-state power dissipation for 1.5KE27CA-T?
The device is rated for 5.0W steady-state power dissipation at a lead temperature (TL) of 75°C with 9.5mm lead lengths. Derating is required above +25°C ambient; the thermal resistance from junction to leads is approximately 15°C/W, limiting continuous DC power to <100mW at room temperature.
1.5KE27CA-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):
- 23.1V
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 37.5V
- Current - Peak Pulse (10/1000µs):
- 40A
- 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
1.5KE27CA-T FAQ
1.How can I place an order for 1.5KE27CA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE27CA-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 1.5KE27CA-T reliable?
The price and inventory of 1.5KE27CA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE27CA-T is usually 5 days.
3.What payment methods are accepted for 1.5KE27CA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE27CA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE27CA-T?
1.5KE27CA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE27CA-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 1.5KE27CA-T?
For technical support, including 1.5KE27CA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE27CA-T requirements.
6.How does Aetrix verify that 1.5KE27CA-T is sourced from the original manufacturer or authorized distributors?
All 1.5KE27CA-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 1.5KE27CA-T meets industry standards.
7.What is the process for return or replacement of 1.5KE27CA-T?
All 1.5KE27CA-T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE27CA-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 1.5KE27CA-T part is unused and in its original packaging.
Return procedure for 1.5KE27CA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE27CA-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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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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