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Vishay General Semiconductor - Diodes Division 1.5KE91A/54
- Part No.:
- 1.5KE91A/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE91A/54.pdf
- Description:
- TVS DIODE 77.8VWM 125VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:2,358
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Product details
Overview
1.5KE91A from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary-side overvoltage protection in DC power rails and signal lines. It features a 86.5 V to 95.5 V breakdown voltage (VBR), 77.8 V maximum working voltage (VWM), 125 V clamping voltage (VC) at 12.0 A peak pulse current, 1500 W peak pulse power (10/1000 µs), and operates across -55 °C to +175 °C junction temperature range - used in automotive power supply input stages and industrial sensor interface protection.
For engineers reviewing the 1.5KE91A datasheet, 1.5KE91A pinout, 1.5KE91A application, or 1.5KE91A equivalent, this page delivers verified electrical parameters, JEDEC-standard 1.5KE package dimensions, polarity marking convention, clamping performance under transient stress, and direct alternative options with documented parameter differences.
Technical Context
The 1.5KE91A employs a glass-passivated silicon junction optimized for fast response (<1 ns) and low incremental surge resistance. Its unidirectional configuration uses a cathode-band-marked axial leaded package, enabling straightforward series connection on positive-rail protection paths.
It delivers 1500 W peak pulse power handling per 10/1000 µs waveform with 0.01% duty cycle, derated linearly above 25 °C ambient per Fig. 2, and maintains stable clamping up to 175 °C junction temperature. The device exhibits 0.106 %/°C temperature coefficient of VBR, ensuring predictable voltage threshold drift across operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 86.5 V to 95.5 V at 1.0 mA test current - defines reliable conduction onset under ESD/lightning transients |
| VWM | 77.8 V maximum - ensures no leakage or false triggering during normal 72 V nominal rail operation |
| VC @ IPPM | 125 V at 12.0 A - limits downstream IC voltage stress to safe levels during 1500 W surge events |
| PPPM | 1500 W (10/1000 µs) - supports robust protection against IEC 61000-4-5 Level 4 surges |
| IFSM | 200 A (8.3 ms half-sine) - withstands repetitive motor-switching or relay-coil turn-off spikes |
| TJ max. | +175 °C - enables use in under-hood automotive environments without thermal derating penalties |
| RθJA | 75 °C/W - informs heatsink-free PCB layout with ≥1 in² copper pour for sustained 6.5 W dissipation |
Pinout & Package
Package: Axial-leaded, molded epoxy case (JEDEC Case Style 1.5KE), RoHS-compliant matte tin-plated leads, UL 94 V-0 rated molding compound. Cathode identified by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to system ground or low-side reference; carries full surge current during clamping |
| Cathode | Protected circuit node connection | Connected to line being protected (e.g., 72 V battery rail); marked with color band |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable long-term leakage performance (<1 µA at VWM) and high reliability in humid environments |
| 1500 W peak pulse power | Meets IEC 61000-4-5 surge immunity requirements for industrial and automotive power inputs |
| Sub-nanosecond response time | Clamps transients before sensitive downstream components (e.g., MCU IO, CAN transceivers) experience overstress |
| AEC-Q101 qualified option available | 1.5KE91AHE3_B variant certified for automotive under-hood applications per stress test protocol |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes protective voltage margin overhead, allowing tighter design margins for 100 V-rated components |
Applications
| Automotive Battery Rail Protection | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Protects 12 V/24 V/48 V vehicle battery feed against load dump (ISO 16750-2) and jump-start surges. IC Role / Device Role / Timing Role: Primary shunt clamp on main power entry point; activates within <1 ns to divert >100 A transients. Use Value: Limits rail voltage to ≤125 V during 1500 W pulses, preventing damage to PMICs and microcontrollers downstream. |
Use Scenario: Shields 4–20 mA current loop inputs in programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and local ground; absorbs inductive kickback from solenoid actuators. Use Value: Maintains analog accuracy by suppressing transients before they reach precision op-amps and ADC front-ends. |
| Telecom Power Supply Input | Motor Drive DC Bus Protection |
Use Scenario: Safeguards AC/DC converter outputs in telecom rectifiers exposed to lightning-induced surges on distribution lines. IC Role / Device Role / Timing Role: Standoff-rated TVS on +48 V output rail; clamps fast-rising transients from coupled AC mains noise. Use Value: Ensures uninterrupted operation by limiting voltage excursions below 125 V, preserving MOSFET gate oxide integrity. |
Use Scenario: Protects IGBT gate drivers and bus capacitors in variable-frequency drives from commutation spikes. IC Role / Device Role / Timing Role: Unidirectional suppressor mounted across DC link capacitor terminals; conducts reverse recovery energy. Use Value: Reduces risk of gate driver latch-up by clamping negative-going transients to ≤125 V during high-dI/dt switching. |
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 (vs. axial 1.5KE), VC = 129 V @ 4.7 A | Better suited for space-constrained PCBs; insufficient for IEC 61000-4-5 Level 4 compliance | Select when board area is critical and surge threat level is limited to IEC 61000-4-2/ESD only |
| 1.5KE91CA | Bidirectional variant; same VBR, VC, and PPPM; no polarity marking; symmetric clamping | Required for AC-coupled or floating signal lines where polarity reversal may occur | Choose only if protecting bidirectional interfaces (e.g., RS-485, CAN bus) without DC bias |
Compared with 1.5KE91A, SMBJ90A offers compactness but sacrifices surge rating and thermal mass, while 1.5KE91CA provides symmetrical protection at identical power handling - neither is pin-compatible due to differing package formats and terminal configurations.
Availability
1.5KE91A is available at Aetrix Electronics and suitable for automotive battery management systems, industrial PLC analog input modules, and telecom power supply designs requiring stable component supply with traceable sourcing and lifecycle continuity.
Supply support for 1.5KE91A 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 demanding industrial and automotive applications.
The 1.5KE series was engineered specifically for high-energy transient suppression in harsh environments, targeting applications where failure modes include lightning-induced surges, inductive switching spikes, and load dump events.
FAQ
What is the clamping voltage of the 1.5KE91A under maximum surge conditions?
The 1.5KE91A clamps to 125 V at its rated peak pulse current of 12.0 A (10/1000 µs waveform). This value is measured per JEDEC standard test conditions and represents the maximum voltage seen downstream during a full 1500 W transient event. Designers must ensure all protected components have voltage ratings exceeding 125 V to maintain functional safety with the 1.5KE91A in circuit.
Is the 1.5KE91A suitable for automotive applications?
Yes - the 1.5KE91A has an AEC-Q101 qualified variant (1.5KE91AHE3_B) explicitly tested for automotive under-hood use. The base 1.5KE91A operates from -55 °C to +175 °C and handles 200 A non-repetitive forward surge current, making it appropriate for battery rail protection in vehicles. Always verify qualification status via the specific suffix when sourcing for automotive programs.
How does the 1.5KE91A differ from the 1.5KE91CA?
The 1.5KE91A is unidirectional with cathode-band marking and asymmetric conduction (conducts only in reverse bias), while the 1.5KE91CA is bidirectional with no polarity marking and symmetric clamping in both directions. Both share identical VBR, VC, and PPPM, but the CA version is required for AC-coupled or floating lines like RS-485 or CAN bus where voltage polarity reverses.
What is the maximum working voltage (VWM) for the 1.5KE91A?
The 1.5KE91A has a maximum steady-state working voltage (VWM) of 77.8 V. This means it remains in high-impedance state with leakage <1 µA up to 77.8 V, making it compatible with 72 V nominal battery systems. Exceeding VWM risks premature conduction and accelerated degradation during continuous operation.
Does the 1.5KE91A require a heatsink for standard operation?
No - the 1.5KE91A is rated for 6.5 W power dissipation on an infinite heatsink at 75 °C lead temperature, but typical transient suppression is non-continuous. For single-event surge protection, no heatsink is needed. However, for repetitive surge scenarios (>0.01% duty cycle), PCB copper area ≥1 in² (2 oz) is recommended to manage thermal rise and sustain reliability over lifetime.
1.5KE91A/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- 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/54 FAQ
1.How can I place an order for 1.5KE91A/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE91A/54 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of 1.5KE91A/54 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/54 is usually 5 days.
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6.How does Aetrix verify that 1.5KE91A/54 is sourced from the original manufacturer or authorized distributors?
All 1.5KE91A/54 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/54 meets industry standards.
7.What is the process for return or replacement of 1.5KE91A/54?
All 1.5KE91A/54 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE91A/54, 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/54 part is unused and in its original packaging.
Return procedure for 1.5KE91A/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE91A/54 Tags
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