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Vishay General Semiconductor - Diodes Division 1.5KE43CAHE3/51
- Part No.:
- 1.5KE43CAHE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE43CAHE3/51.pdf
- Description:
- TVS DIODE 36.8VWM 59.3VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:4,227
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Product details
Overview
1.5KE43CAHE3/51 from Vishay General Semiconductor is a bi-directional Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 43 V breakdown voltage (VBR min/max: 40.9–45.2 V), 36.8 V stand-off voltage (VWM), 59.3 V clamping voltage (VC) at 25.3 A peak pulse current, 1500 W peak pulse power (10/1000 µs), and AEC-Q101 qualification - deployed to safeguard MOSFETs, ICs, and sensor interfaces against lightning-induced surges and inductive switching transients.
For engineers reviewing the 1.5KE43CAHE3/51 datasheet, 1.5KE43CAHE3/51 pinout, 1.5KE43CAHE3/51 application, or 1.5KE43CAHE3/51 equivalent, this part delivers verified bi-directional clamping performance with RoHS-compliant, AEC-Q101-qualified construction, low incremental surge resistance, and fast sub-nanosecond response - critical for automotive powertrain modules, industrial PLC I/O protection, and telecom line interface circuits requiring high-reliability transient immunity.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, with identical electrical characteristics in forward and reverse directions. Its glass-passivated junction enables stable 1500 W peak pulse power handling under 10/1000 µs waveform conditions and supports repetitive surge duty cycles up to 0.01 %.
The device exhibits a temperature coefficient of VBR of +0.101 %/°C, ensuring predictable voltage drift over operating range (–55 °C to +175 °C), and maintains low leakage (<1 µA at VWM) while delivering tight clamping (VC/VBR ratio ≈ 1.41) for precise overvoltage limiting in sensitive analog and digital circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 40.9 V / 45.2 V - guaranteed breakdown threshold ensures reliable triggering before downstream component damage |
| VWM | 36.8 V - maximum continuous working voltage; system must operate below this to avoid leakage or premature conduction |
| VC @ IPPM | 59.3 V at 25.3 A - clamped voltage during 1500 W transient; defines worst-case stress on protected circuitry |
| PPPM | 1500 W - peak pulse power rating per 10/1000 µs waveform; determines surge energy absorption capability |
| IPPM | 25.3 A - peak pulse current corresponding to VC; used to size series impedance and verify PCB trace survival |
| TJ max. | +175 °C - maximum junction temperature; enables operation in under-hood automotive and high-ambient industrial environments |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
Package: Case Style 1.5KE - axial-leaded, molded epoxy body meeting UL 94 V-0 flammability rating; matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. Bi-directional polarity: no marking on device body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional transient conduction path | No polarity distinction; either lead serves as input/output for bidirectional surge suppression |
| Leads (2) | Thermal and electrical interface | Provide mechanical mounting and heat dissipation path; RθJL = 15.4 °C/W enables effective lead-based thermal management |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Ensures long-term stability and low parameter drift under thermal cycling and humidity exposure |
| 1500 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-line) without derating in standard layouts |
| Sub-nanosecond response time | Clamps transients within 1 ns - faster than MOVs or polymer-based protectors, preserving signal integrity |
| AEC-Q101 qualification | Validated for automotive power electronics including engine control units and battery management systems |
| RoHS-compliant HE3 suffix | Meets JESD 201 Class 2 whisker resistance; suitable for high-reliability solder reflow and wave processes |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V power rails in engine control units (ECUs) against load dump and alternator ripple. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed across supply rail to shunt surge energy to ground before reaching microcontroller or gate drivers. Use Value: Withstands 1500 W pulses and operates up to +175 °C, enabling direct placement near high-temperature power stages without thermal derating. |
Use Scenario: Shielding 4–20 mA current loop inputs in programmable logic controllers (PLCs) from field-induced surges. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA at 36.8 V) bi-directional TVS placed across loop terminals to suppress ±1 kV EFT bursts. Use Value: Tight VC of 59.3 V ensures analog front-end ICs remain within absolute maximum ratings during transient events. |
| Telecom Line Card Surge Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Safeguarding Ethernet PHY or RS-485 transceivers on outdoor telecom base station line cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on differential pair inputs, coordinated with secondary GDT or polymer devices for staged protection. Use Value: Symmetrical clamping and 0.101 %/°C VBR TC ensure consistent protection margin across –40 °C to +85 °C operating range. |
Use Scenario: Suppressing inductive kickback from brushed DC motors in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Across-motor terminals to clamp back-EMF spikes during commutation and switch-off events. Use Value: 25.3 A IPPM rating handles typical motor turn-off currents; glass passivation prevents degradation under repeated surge stress. |
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 | Lower PPPM (600 W), smaller SMB package (vs. axial 1.5KE), higher VC (70.1 V) | Better suited for space-constrained PCBs but requires derating for >600 W surge events | Select when board area is limited and peak surge energy is ≤600 W; verify thermal relief for sustained pulses |
| 1.5SMC43CA | Same PPPM (1500 W), SMC package (surface-mount), slightly higher VC (61.3 V), same VBR range | Enables automated assembly and improved high-frequency impedance vs. axial leads | Choose for reflow-compatible designs needing identical power rating and AEC-Q101 compliance in SMT format |
Compared with 1.5KE43CAHE3/51, SMBJ43CA trades surge capacity and thermal mass for compactness, while 1.5SMC43CA retains full 1500 W capability in surface-mount form - making it ideal for new designs prioritizing automation and layout density without sacrificing protection level.
Availability
1.5KE43CAHE3/51 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom line card surge suppression, and consumer appliance motor drive protection requiring stable component supply and AEC-Q101 assurance.
Supply support for 1.5KE43CAHE3/51 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in high-reliability diodes, rectifiers, and protection devices for demanding industrial and automotive applications.
The 1.5KE family was engineered specifically for high-energy transient suppression in harsh environments, emphasizing robustness, repeatable clamping, and qualification to automotive and industrial reliability standards.
FAQ
What is the clamping voltage of the 1.5KE43CAHE3/51 under maximum rated surge current?
The 1.5KE43CAHE3/51 has a maximum clamping voltage (VC) of 59.3 V at its rated peak pulse current (IPPM) of 25.3 A, measured using a 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during a full 1500 W transient event and is critical for verifying that downstream components remain within their absolute maximum voltage ratings. The 1.5KE43CAHE3/51 achieves this with minimal overshoot due to its fast sub-nanosecond response.
Is the 1.5KE43CAHE3/51 suitable for automotive applications?
Yes, the 1.5KE43CAHE3/51 is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units, body electronics, and power distribution modules. Its operating junction temperature range of –55 °C to +175 °C, combined with JEDEC-compliant thermal resistance (RθJL = 15.4 °C/W), ensures reliable performance under hood and under-chassis conditions. The HE3 suffix confirms compliance with JESD 201 Class 2 whisker resistance for automotive solder processes.
How does the bi-directional configuration of the 1.5KE43CAHE3/51 affect its circuit implementation?
The 1.5KE43CAHE3/51 is inherently bi-directional, meaning it provides symmetrical clamping in both polarities without cathode/anode orientation constraints - no color band marking is present. This allows direct placement across AC-coupled signal lines, differential buses (e.g., RS-485), or ungrounded power rails where polarity reversal or common-mode surges may occur. Its design eliminates the need for polarity-aware layout or redundant uni-directional devices in such topologies.
What is the maximum steady-state power dissipation of the 1.5KE43CAHE3/51?
The 1.5KE43CAHE3/51 has a maximum steady-state power dissipation (PD) of 6.5 W when mounted on an infinite heatsink at lead temperature (TL) = 75 °C. This rating applies only to continuous DC or low-duty-cycle conditions - not transient suppression. In normal operation, leakage current remains ≤1 µA at 36.8 V, resulting in negligible steady-state power loss. The 1.5KE43CAHE3/51 is intended for infrequent surge events, not continuous power handling.
Does the 1.5KE43CAHE3/51 require external series impedance for optimal protection?
Yes, the 1.5KE43CAHE3/51 should be used with a series current-limiting element (e.g., resistor, PTC, or ferrite bead) to manage let-through energy and prevent thermal runaway during prolonged overvoltage. While the device clamps rapidly at 59.3 V, sustained overvoltage above VWM (36.8 V) increases leakage and power dissipation. Proper coordination ensures the 1.5KE43CAHE3/51 operates within its safe operating area and avoids failure during extended fault conditions.
1.5KE43CAHE3/51 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Bulk
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE43CAHE3/51 FAQ
1.How can I place an order for 1.5KE43CAHE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE43CAHE3/51 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 1.5KE43CAHE3/51 reliable?
The price and inventory of 1.5KE43CAHE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE43CAHE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE43CAHE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE43CAHE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE43CAHE3/51?
1.5KE43CAHE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE43CAHE3/51 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 1.5KE43CAHE3/51?
For technical support, including 1.5KE43CAHE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE43CAHE3/51 requirements.
6.How does Aetrix verify that 1.5KE43CAHE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE43CAHE3/51 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 1.5KE43CAHE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE43CAHE3/51?
All 1.5KE43CAHE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE43CAHE3/51, 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 1.5KE43CAHE3/51 part is unused and in its original packaging.
Return procedure for 1.5KE43CAHE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE43CAHE3/51 Tags
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Diodes Incorporated
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