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Vishay General Semiconductor - Diodes Division 1.5KE24AHE3/51
- Part No.:
- 1.5KE24AHE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE24AHE3/51.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:3,732
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Product details
Overview
1.5KE24AHE3/51 from Vishay General Semiconductor is a uni-directional Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 22.8 V minimum breakdown voltage (VBR), 20.5 V maximum stand-off voltage (VWM), 33.2 V clamping voltage (VC) at 45.2 A peak pulse current, 1500 W peak pulse power rating (10/1000 µs), and AEC-Q101 qualification - enabling use in automotive engine control units and industrial power supplies.
For engineers reviewing the 1.5KE24AHE3/51 datasheet, 1.5KE24AHE3/51 pinout, 1.5KE24AHE3/51 application, or 1.5KE24AHE3/51 equivalent, this page delivers verified electrical parameters, JEDEC-standard 1.5KE package dimensions, clamping behavior under transient stress, thermal derating curves, and direct alternatives with documented differences in breakdown tolerance, leakage, and automotive qualification status.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR (22.8–25.2 V), it avalanches to limit transient energy across protected circuit nodes. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance (<0.7 Ω typical), critical for fast suppression of 10/1000 µs surges.
It supports uni-directional polarity only (cathode marked), with 1.0 mA test current (IT), 1.0 µA max reverse leakage at VWM, and 3.5 V max forward voltage at 100 A. Thermal resistance is 15.4 °C/W junction-to-lead, enabling reliable operation up to 175 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 22.8 V / 25.2 V - defines precise avalanche initiation window; ensures reliable triggering before downstream IC damage threshold. |
| VWM | 20.5 V - maximum continuous reverse operating voltage; must exceed system DC rail (e.g., 18 V nominal) with margin. |
| VC @ IPPM | 33.2 V at 45.2 A - clamped voltage during 1500 W transient; determines worst-case stress on protected load. |
| PPPM | 1500 W (10/1000 µs) - peak surge handling capacity; validates suitability for IEC 61000-4-5 Level 4 (4 kV) line transients. |
| IFSM | 200 A (8.3 ms half-sine) - surge current robustness for repetitive inductive switching events like relay coil de-energization. |
| TJ max | +175 °C - extended thermal range enables placement near hot components (e.g., MOSFETs, inductors) without derating. |
| AEC-Q101 | Qualified - certified for automotive applications including powertrain and body electronics per stress-test requirements. |
Pinout & Package
Package: JEDEC DO-201AD (Case Style 1.5KE), axial-leaded, molded epoxy body meeting UL 94 V-0. Leads are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, with E3 suffix indicating RoHS compliance and HE3 denoting AEC-Q101 qualification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node (e.g., GND or return path); conducts during positive transients when used in reverse-biased configuration. |
| Cathode | Avalanche clamping terminal | Marked end (band); connected to protected line (e.g., +12 V rail); conducts reverse current during overvoltage events to clamp voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance (±5 %) and long-term reliability under thermal cycling and humidity exposure. |
| 1500 W peak pulse power (10/1000 µs) | Supports high-energy surge standards (IEC 61000-4-5) without degradation after repeated 4 kV strikes. |
| AEC-Q101 qualification | Validates performance across -55 °C to +175 °C, vibration, mechanical shock, and HTRB stress for automotive deployment. |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes let-through voltage during clamping - critical for protecting 24 V logic interfaces and CAN transceivers. |
| Matte tin leads, JESD 201 Class 2 whisker-tested | Enables lead-free reflow assembly and eliminates tin whisker risk in high-reliability industrial control systems. |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
|
Use Scenario: Suppressing load-dump transients (up to 35 V, 100 ms) on 24 V battery-fed ECUs in commercial vehicles. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between battery rail and regulator input, responding in <1 ns to clamp voltage below 35 V. Use Value: Prevents destruction of LDOs and microcontrollers during alternator regulation failure, validated per ISO 7637-2 Pulse 5a. |
Use Scenario: Protecting 24 V digital input channels of programmable logic controllers against field-wiring induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on dry-contact inputs exposed to inductive kickback from solenoid valves and motor starters. Use Value: Limits input voltage to ≤33.2 V during 1 kV/0.5 µs transients, ensuring signal integrity and eliminating false triggering of optocouplers. |
| DC Motor Drive Gate Protection | Telecom Power Supply Clamp |
|
Use Scenario: Safeguarding gate drivers and bootstrap circuits in 24 V H-bridge motor controllers from shoot-through-induced voltage spikes. IC Role / Device Role / Timing Role: Fast-acting clamp across high-side FET source-to-drain, activated within nanoseconds of dv/dt exceeding dV/dt immunity. Use Value: Maintains gate oxide integrity by limiting transient overshoot to 33.2 V, preventing unintended turn-on and cross-conduction failures. |
Use Scenario: Secondary-stage clamping on 24 V telecom rectifier outputs subjected to lightning-induced surges on AC mains feeders. IC Role / Device Role / Timing Role: Final-line defense after MOV-based primary protection, absorbing residual energy that bypasses upstream stages. Use Value: Delivers precise 33.2 V clamping with <1 ns response, preserving PoE controller ICs and Ethernet PHYs downstream of bulk filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A | Lower PPPM (600 W), smaller SMB package (vs. DO-201AD), VC = 38.9 V at 15.4 A - higher clamping voltage and lower surge capacity. | Best suited for space-constrained PCBs with moderate surge exposure (IEC 61000-4-4 Level 3), not recommended for automotive load-dump. | Select 1.5KE24AHE3/51 when 1500 W surge handling and AEC-Q101 qualification are mandatory; choose SMBJ24A only for cost-sensitive consumer-grade 24 V systems. |
| 1.5KE24CA | Bi-directional variant (no polarity marking), identical VBR/VC/PPPM, but rated for ±24 V symmetric clamping - unsuitable for DC rail protection requiring unidirectional blocking. | Used in AC-coupled signal lines (e.g., RS-485, CAN FD differential pairs) where bidirectional transients occur; cannot replace 1.5KE24AHE3/51 in DC power applications. | Use 1.5KE24AHE3/51 for 24 V DC supply protection; select 1.5KE24CA only when protecting balanced differential buses subject to bipolar surges. |
Compared with SMBJ24A and 1.5KE24CA, the 1.5KE24AHE3/51 uniquely combines 1500 W surge capability, AEC-Q101 qualification, and uni-directional 20.5 V stand-off in a rugged DO-201AD package - making it the only option among the three qualified for automotive 24 V power rail protection per ISO 16750-2.
Availability
1.5KE24AHE3/51 is available at Aetrix Electronics and suitable for automotive power management, industrial PLC input conditioning, and DC motor drive gate protection requiring stable component supply and full traceability.
Supply support for 1.5KE24AHE3/51 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, MOSFETs, and passive components for automotive, industrial, and computing markets.
The 1.5KE series was engineered specifically for high-energy transient suppression in harsh environments, emphasizing robustness, tight VBR tolerance, and AEC-Q101 compliance for under-hood and factory-floor applications.
FAQ
What is the breakdown voltage tolerance for 1.5KE24AHE3/51?
The 1.5KE24AHE3/51 has a guaranteed breakdown voltage range of 22.8 V to 25.2 V at 1.0 mA test current (IT), corresponding to a ±5 % tolerance around the nominal 24 V rating. This tight tolerance ensures predictable clamping onset across production lots and temperature extremes from –55 °C to +175 °C.
Is 1.5KE24AHE3/51 suitable for protecting a 24 V CAN bus transceiver?
Yes - the 1.5KE24AHE3/51 is appropriate for CAN bus protection when placed on the VCC supply line of the transceiver. Its 20.5 V stand-off voltage provides margin above 24 V nominal rails, and its 33.2 V clamping voltage stays well below the 40 V absolute maximum rating of most CAN transceivers (e.g., TJA1042, SN65HVD230). It must be paired with signal-line TVS devices for differential pair protection.
Does 1.5KE24AHE3/51 require a heatsink for continuous operation?
No heatsink is required for normal operation because the 1.5KE24AHE3/51 is rated for 6.5 W power dissipation on an infinite heatsink at 75 °C lead temperature, and its typical junction-to-lead thermal resistance is only 15.4 °C/W. In standard PCB mounting with 0.375" (9.5 mm) lead length, it safely handles ambient temperatures up to +125 °C without derating under steady-state conditions.
How does the HE3 suffix affect the 1.5KE24AHE3/51 specification?
The HE3 suffix on 1.5KE24AHE3/51 indicates RoHS compliance plus AEC-Q101 qualification - distinguishing it from commercial-grade E3 variants. This means the device has passed accelerated stress tests including temperature cycling, high-temperature reverse bias, and unbiased highly accelerated stress testing (uHAST), confirming suitability for automotive powertrain and chassis applications.
Can 1.5KE24AHE3/51 be used in parallel to increase surge current handling?
Parallel connection of 1.5KE24AHE3/51 devices is not recommended due to mismatch in VBR tolerance (±5 %) and dynamic impedance, which causes uneven current sharing and potential thermal runaway. For higher surge ratings, Vishay specifies series/parallel configurations only with matched lots and external balancing resistors - consult Application Note AN934 for validated methods.
1.5KE24AHE3/51 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20.5V
- Voltage - Breakdown (Min):
- 22.8V
- Voltage - Clamping (Max) @ Ipp:
- 33.2V
- Current - Peak Pulse (10/1000µs):
- 45.2A
- 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
1.5KE24AHE3/51 FAQ
1.How can I place an order for 1.5KE24AHE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE24AHE3/51 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 1.5KE24AHE3/51 reliable?
The price and inventory of 1.5KE24AHE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE24AHE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE24AHE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE24AHE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE24AHE3/51?
1.5KE24AHE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE24AHE3/51 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 1.5KE24AHE3/51?
For technical support, including 1.5KE24AHE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE24AHE3/51 requirements.
6.How does Aetrix verify that 1.5KE24AHE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE24AHE3/51 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 1.5KE24AHE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE24AHE3/51?
All 1.5KE24AHE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE24AHE3/51, 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 1.5KE24AHE3/51 part is unused and in its original packaging.
Return procedure for 1.5KE24AHE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE24AHE3/51 Tags
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