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Vishay General Semiconductor - Diodes Division 1.5KE91A-E3/51
- Part No.:
- 1.5KE91A-E3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE91A-E3/51.pdf
- Description:
- TVS DIODE 77.8VWM 125VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:5,193
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Product details
Overview
1.5KE91A-E3/51 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary-side overvoltage protection in power rails and signal lines. It features a 86.5 V to 95.5 V breakdown voltage (VBR), 77.8 V stand-off voltage (VWM), 125 V clamping voltage (VC) at 12.0 A peak pulse current, 1500 W peak pulse power (10/1000 µs), and operates from –55 °C to +175 °C - deployed in automotive power supply input stages and industrial I/O protection.
For engineers reviewing the 1.5KE91A-E3/51 datasheet, 1.5KE91A-E3/51 pinout, 1.5KE91A-E3/51 application, or 1.5KE91A-E3/51 equivalent, this page delivers verified electrical parameters, JEDEC 1.5KE package details, clamping behavior under surge conditions, thermal resistance (RθJA = 75 °C/W), and direct alternative part comparisons for ESD and lightning transient suppression design.
Technical Context
This unidirectional TVS diode uses a glass-passivated silicon junction optimized for fast response (<1 ns) and low incremental surge resistance. Its clamping action limits transient voltages before sensitive downstream components - such as microcontrollers, MOSFET gate drivers, or CAN transceivers - experience overstress.
Rated for 1500 W peak pulse power with 10/1000 µs waveform and derated above 25 °C ambient, it supports repetitive surge events at ≤0.01% duty cycle. The device exhibits 3.5 V forward voltage at 100 A (per spec note for VBR ≤ 220 V), and meets JESD 22-B106 solderability standards with matte tin-plated leads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 86.5 V / 95.5 V - ensures reliable conduction onset above normal operating rail (e.g., 72 V nominal DC bus) while avoiding false triggering |
| VWM | 77.8 V - maximum continuous reverse working voltage; defines safe operating margin below breakdown |
| VC @ IPPM | 125 V at 12.0 A - clamped voltage seen by protected circuit during full-rated 1500 W transient event |
| PPPM | 1500 W - peak surge power handling capability per 10/1000 µs standard waveform (IEC 61000-4-5) |
| IPPM | 12.0 A - peak pulse current corresponding to VC = 125 V; used to size series impedance for current limiting |
| TJ max. | +175 °C - enables use in under-hood automotive environments and high-temperature industrial enclosures |
| RθJA | 75 °C/W - thermal resistance from junction to ambient; informs heatsinking requirements for sustained surge duty |
Pinout & Package
Package: JEDEC DO-201AD (Case Style 1.5KE), axial leaded, molded epoxy body with UL 94 V-0 rating. Cathode indicated by color band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-voltage reference; completes conduction path during reverse-biased transient |
| Cathode | High-side connection point | Connected to protected line (e.g., 48 V rail); blocks normal operation but conducts when VAK exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable, repeatable breakdown characteristics and long-term reliability under thermal cycling |
| 1500 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-ground) without external crowbar |
| Clamping voltage ≤125 V at 12 A | Provides defined overvoltage ceiling for 72–96 V systems, protecting downstream 100 V-rated MOSFETs or regulators |
| Response time <1 ns | Acts before induced transients propagate through PCB traces or IC input structures |
| RoHS-compliant E3 suffix | Meets JESD 201 Class 1A whisker resistance; suitable for commercial and industrial reflow/solder dip assembly |
Applications
| Automotive Power Input Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: 24 V/48 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role: Primary clamping element placed between power rail and ground, upstream of DC/DC converter input. Use Value: Limits transient voltage to ≤125 V, preventing damage to 100 V input-rated buck controllers and gate drivers. |
Use Scenario: 24 V digital input modules receiving signals from field sensors in factory automation. IC Role / Device Role: Standoff protector on dry-contact or PNP/NPN input channels subject to wiring-induced surges. Use Value: Absorbs 1500 W surges without degradation, maintaining <1 µA leakage at 77.8 V to avoid false logic detection. |
| Telecom Line Card Surge Protection | Motor Drive Gate Driver Supply Clamp |
Use Scenario: -48 V DC power feed to remote radio units in cellular base stations. IC Role / Device Role: Secondary protection stage after gas discharge tube (GDT), suppressing residual ringwave energy. Use Value: Fast sub-nanosecond response captures overshoot missed by slower GDTs, reducing clamp voltage stress on DC/DC isolators. |
Use Scenario: 15 V isolated gate drive supply for 650 V SiC MOSFETs in servo inverters. IC Role / Device Role: Rail clamp on gate driver VDD pin to suppress Miller-induced spikes during high dV/dt switching. Use Value: Clamps transients to 125 V within 1 ns, preventing unintended turn-on or oxide stress in gate oxide layers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90A | Lower PPPM (600 W), smaller SMB package (vs. DO-201AD), VC = 129 V @ 4.7 A | Better suited for space-constrained PCBs with lower-energy transients (IEC 61000-4-2 ESD only) | Select SMBJ90A when board area is critical and surge energy does not exceed 600 W; verify thermal performance in confined layouts. |
| 1.5KE91CA | Bidirectional variant; same VBR, VC, and PPPM, but symmetric clamping for AC-coupled or floating lines | Required for differential signal lines (e.g., RS-485, CAN bus) where polarity reversal occurs | Choose 1.5KE91CA only when protecting bidirectional or AC-signaled paths; unidirectional 1.5KE91A-E3/51 is optimal for DC rails with defined polarity. |
Compared with SMBJ90A, 1.5KE91A-E3/51 delivers 2.5× higher surge power handling and superior thermal dissipation in high-reliability 24–96 V systems; versus 1.5KE91CA, it offers lower capacitance and avoids unnecessary bidirectional conduction in grounded DC applications.
Availability
1.5KE91A-E3/51 is available at Aetrix Electronics and suitable for automotive power distribution units, industrial programmable logic controller (PLC) I/O modules, telecom line cards, and motor drive gate driver protection requiring stable component supply across extended production lifecycles.
Supply support for 1.5KE91A-E3/51 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 diodes, rectifiers, and protection devices with emphasis on reliability, ruggedness, and AEC-Q101 qualification.
The 1.5KE series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure modes must be mitigated without compromising long-term stability.
FAQ
What is the breakdown voltage tolerance for 1.5KE91A-E3/51?
The 1.5KE91A-E3/51 has a specified breakdown voltage range of 86.5 V to 95.5 V at 1.0 mA test current (IT). This ±5% tolerance ensures consistent clamping onset across production lots while allowing margin for system-level voltage variation and temperature drift.
Is 1.5KE91A-E3/51 RoHS compliant and lead-free?
Yes, the "E3" suffix in 1.5KE91A-E3/51 indicates full RoHS compliance per Directive 2011/65/EU, with matte tin-plated leads meeting J-STD-002 and JESD 22-B102 solderability standards and JESD 201 Class 1A whisker resistance testing.
Can 1.5KE91A-E3/51 be used in automotive applications?
Yes - while the base 1.5KE91A-E3/51 is commercial grade, its 175 °C maximum junction temperature, robust glass-passivated junction, and compatibility with AEC-Q101-qualified variants (e.g., 1.5KE91AHE3_B) make it suitable for under-dash and engine bay applications when thermally managed per derating curves.
What is the clamping voltage of 1.5KE91A-E3/51 at rated surge current?
The 1.5KE91A-E3/51 clamps to a maximum of 125 V at its rated peak pulse current of 12.0 A (10/1000 µs waveform). This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during worst-case surge events.
How does the thermal resistance of 1.5KE91A-E3/51 affect layout design?
With RθJA = 75 °C/W, 1.5KE91A-E3/51 requires adequate copper pour and thermal vias if subjected to repeated surges. For single-event protection, minimal copper suffices; for repetitive duty, PCB land pattern should emulate the 0.375" lead length condition referenced in Fig. 5 of the datasheet.
1.5KE91A-E3/51 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE91A-E3/51 FAQ
1.How can I place an order for 1.5KE91A-E3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE91A-E3/51 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 1.5KE91A-E3/51 reliable?
The price and inventory of 1.5KE91A-E3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE91A-E3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE91A-E3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE91A-E3/51 transactions.
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Once your 1.5KE91A-E3/51 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 1.5KE91A-E3/51?
For technical support, including 1.5KE91A-E3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE91A-E3/51 requirements.
6.How does Aetrix verify that 1.5KE91A-E3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE91A-E3/51 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 1.5KE91A-E3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE91A-E3/51?
All 1.5KE91A-E3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE91A-E3/51, 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 1.5KE91A-E3/51 part is unused and in its original packaging.
Return procedure for 1.5KE91A-E3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE91A-E3/51 Tags
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