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Vishay General Semiconductor - Diodes Division 1.5KE91AHE3/51
- Part No.:
- 1.5KE91AHE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE91AHE3/51.pdf
- Description:
- TVS DIODE 77.8VWM 125VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:2,303
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Product details
Overview
1.5KE91AHE3/51 from Vishay General Semiconductor is a uni-directional transient voltage suppressor (TVS) diode designed for primary overvoltage protection of DC power rails and signal lines. It features a 86.5 V minimum breakdown voltage (VBR), 77.8 V maximum stand-off voltage (VWM), 125 V clamping voltage (VC) at 12 A peak pulse current, 1500 W peak pulse power rating (10/1000 µs), and AEC-Q101 qualification for automotive-grade reliability in engine control units and body electronics.
For engineers reviewing the 1.5KE91AHE3/51 datasheet, 1.5KE91AHE3/51 pinout, 1.5KE91AHE3/51 application, or 1.5KE91AHE3/51 equivalent, this part serves as a high-energy, fast-response (≤1 ns) clamping device for protecting MOSFETs, microcontrollers, and sensor interfaces against lightning-induced surges, inductive switching transients, and ESD events in harsh industrial and automotive environments.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector with a glass-passivated silicon junction, enabling sub-nanosecond response to transients. Its uni-directional polarity-marked by a cathode band-ensures asymmetric conduction: low-impedance clamping during reverse overvoltage while blocking forward current up to 3.5 V at 100 A.
The device is rated for 1500 W peak pulse power (10/1000 µs waveform), derated linearly above 25 °C ambient per JEDEC curves, and supports 200 A non-repetitive forward surge current (8.3 ms half-sine). Thermal resistance is 15.4 °C/W junction-to-lead, enabling direct PCB trace heat sinking without external heatsinks in moderate-duty applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 86.5 V / 95.5 V at 1 mA test current - defines precise clamping onset threshold under standardized conditions |
| VWM | 77.8 V maximum - ensures reliable blocking of normal operating voltage with ≥10 % margin below VBR min |
| VC @ IPPM | 125 V at 12 A - limits worst-case transient voltage seen by downstream ICs during full-rated surge |
| PPPM | 1500 W (10/1000 µs) - delivers robust protection against lightning surges (IEC 61000-4-5 Level 4) and load dump |
| IFSM | 200 A (8.3 ms half-sine) - withstands high-current inductive kickback without bond wire failure |
| TJ max | +175 °C - enables operation in under-hood automotive locations and high-ambient industrial enclosures |
| AEC-Q101 | Qualified - validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD HBM/MM |
Pinout & Package
Package: Case Style 1.5KE - axial-leaded, molded epoxy body (UL 94 V-0), matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified (HE3 suffix). Dimensions: 5.3 mm diameter × 9.5 mm length, lead spacing 9.5 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path); conducts only during forward surge events |
| Cathode | Reverse-biased clamping terminal | Marked with color band; connected to protected line (e.g., +12 V rail); initiates clamping when VAK exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| 1500 W peak pulse power (10/1000 µs) | Provides single-event protection against IEC 61000-4-5 4 kV/2 Ω surge waveforms without degradation |
| Sub-nanosecond response time | Clamps transients before sensitive ICs experience damaging overvoltage-critical for MCU I/O and CAN bus protection |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, chassis, and ADAS modules requiring zero-failure field performance |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, reducing stress on downstream capacitors and regulators |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Digital Input Module |
|---|---|
Use Scenario: Protecting 12 V supply rail from alternator load dump and relay coil flyback in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Shunt clamping TVS placed directly at microcontroller power input, activated within <1 ns of overvoltage event. Use Value: Limits rail voltage to ≤125 V during 100 V/100 ms load dump, preventing brownout reset and gate oxide damage in power management ICs. |
Use Scenario: Safeguarding 24 V digital input circuits from field-wiring induced surges in factory automation PLCs. IC Role / Device Role / Timing Role: Primary protection element upstream of optocoupler input stage, absorbing energy before signal conditioning circuitry. Use Value: Withstands repeated 1 kV/500 A surges (IEC 61000-4-5) without parameter shift, ensuring >10-year field life in dusty, high-vibration environments. |
| Telecom Remote Radio Head (RRH) | Consumer Appliance Motor Drive Board |
Use Scenario: Shielding RS-485 communication lines and DC bias rails from lightning-induced surges on outdoor telecom tower cabling. IC Role / Device Role / Timing Role: Bi-directional-capable variant not used; this uni-directional part protects positive supply rail feeding RF power amplifiers. Use Value: Clamps 4 kV ring wave transients to safe levels (<130 V), preserving GaN FET gate integrity and maintaining 24/7 uptime in 5G infrastructure. |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Mounted across motor terminals to clamp inductive kickback before it reaches MCU GPIOs and H-bridge drivers. Use Value: Absorbs 1500 W pulses without failure, eliminating false resets and extending motor driver IC lifetime beyond 15,000 cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90A | Lower PPPM (600 W), smaller SMB package (surface-mount), VC = 123 V @ 4.9 A | Better suited for space-constrained PCBs with lower surge energy requirements (IEC 61000-4-2/4-4) | Select SMBJ90A when board area is limited and peak surge current remains ≤5 A; not suitable for load dump or IEC 61000-4-5 Level 4. |
| 1.5KE91CA | Bi-directional version (same VBR/VC specs), symmetric clamping for AC-coupled or floating signal lines | Required for differential data lines (e.g., RS-485, CAN FD) where polarity reversal occurs during transients | Choose 1.5KE91CA only when protecting bidirectional signals; 1.5KE91AHE3/51 remains optimal for unidirectional DC rails due to tighter VWM margin and lower leakage. |
Compared with SMBJ90A, 1.5KE91AHE3/51 delivers 2.5× higher surge energy handling and axial-leaded mechanical robustness for high-vibration environments; versus 1.5KE91CA, it offers superior DC rail blocking margin and lower reverse leakage-making it the preferred choice for automotive power supply protection.
Availability
1.5KE91AHE3/51 is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, telecom remote radio heads, and consumer appliance motor drive boards requiring stable component supply across multi-year production cycles.
Supply support for 1.5KE91AHE3/51 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 optoelectronics for automotive, industrial, and computing markets.
The 1.5KE series was engineered specifically for high-energy transient suppression in demanding DC power systems, balancing clamping precision, surge endurance, and AEC-Q101 compliance for mission-critical automotive electronics.
FAQ
What is the clamping voltage of the 1.5KE91AHE3/51 under full-rated surge current?
The 1.5KE91AHE3/51 exhibits a maximum clamping voltage (VC) of 125 V when subjected to its rated 12 A peak pulse current (IPPM) using the standard 10/1000 µs waveform. This value is measured per JEDEC test conditions and guarantees that downstream components see no more than 125 V during worst-case transient events, provided layout minimizes parasitic inductance.
Is the 1.5KE91AHE3/51 suitable for automotive under-hood applications?
Yes, the 1.5KE91AHE3/51 is AEC-Q101 qualified and rated for operation from –55 °C to +175 °C junction temperature. Its glass-passivated junction, robust epoxy molding (UL 94 V-0), and 200 A surge capability make it appropriate for engine control units, transmission control modules, and other under-hood systems exposed to thermal cycling, vibration, and high-energy transients.
How does the 1.5KE91AHE3/51 differ from the standard 1.5KE91A part?
The 1.5KE91AHE3/51 differs from the base 1.5KE91A by its HE3 suffix: it is RoHS-compliant and AEC-Q101 qualified, whereas the standard 1.5KE91A (E3 suffix) is RoHS-compliant but commercial-grade only. The HE3 variant undergoes additional stress testing-including high-temperature operating life and temperature cycling-to meet automotive reliability standards.
Can the 1.5KE91AHE3/51 be used in parallel to increase surge handling capacity?
No-parallel connection of 1.5KE91AHE3/51 devices is not recommended due to VBR tolerance mismatch (±5 %), which causes uneven current sharing and potential thermal runaway. For higher energy handling, use a single higher-rated device (e.g., 1.5KE100A) or implement staged protection with upstream current-limiting resistors and downstream low-capacitance TVS arrays.
What is the maximum reverse leakage current of the 1.5KE91AHE3/51 at its stand-off voltage?
At its maximum stand-off voltage (VWM) of 77.8 V and ambient temperature of 25 °C, the 1.5KE91AHE3/51 exhibits a maximum reverse leakage current (ID) of 1.0 µA. This ultra-low leakage ensures minimal power loss in always-on automotive modules and preserves battery life in infotainment and telematics systems.
1.5KE91AHE3/51 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):
- 77.8V
- Voltage - Breakdown (Min):
- 86.5V
- Voltage - Clamping (Max) @ Ipp:
- 125V
- Current - Peak Pulse (10/1000µs):
- 12A
- 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
1.5KE91AHE3/51 FAQ
1.How can I place an order for 1.5KE91AHE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE91AHE3/51 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 1.5KE91AHE3/51 reliable?
The price and inventory of 1.5KE91AHE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE91AHE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE91AHE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE91AHE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE91AHE3/51?
1.5KE91AHE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE91AHE3/51 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 1.5KE91AHE3/51?
For technical support, including 1.5KE91AHE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE91AHE3/51 requirements.
6.How does Aetrix verify that 1.5KE91AHE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE91AHE3/51 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 1.5KE91AHE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE91AHE3/51?
All 1.5KE91AHE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE91AHE3/51, 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 1.5KE91AHE3/51 part is unused and in its original packaging.
Return procedure for 1.5KE91AHE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE91AHE3/51 Tags
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