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Vishay General Semiconductor - Diodes Division 1.5KE91A-E3/54
- Part No.:
- 1.5KE91A-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE91A-E3/54.pdf
- Description:
- TVS DIODE 77.8VWM 125VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:1,390
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Product details
Overview
1.5KE91A-E3/54 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary 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 standoff voltage (VWM), 125 V clamping voltage at 12 A peak pulse current, 1500 W peak pulse power rating (10/1000 µs), and operates across -55 °C to +175 °C junction temperature range - used to safeguard MOSFETs, ICs, and sensor interfaces against lightning-induced surges and inductive switching transients.
For engineers reviewing the 1.5KE91A-E3/54 datasheet, 1.5KE91A-E3/54 pinout, 1.5KE91A-E3/54 application, or 1.5KE91A-E3/54 equivalent, this device is selected for high-energy transient suppression where fast response (<1 ns), low clamping ratio (VC/VBR ≈ 1.37), and robust 200 A surge capability (IFSM) are required in automotive, industrial, and telecom power supply designs.
Technical Context
This unidirectional TVS diode employs a glass-passivated silicon junction optimized for rapid avalanche breakdown under transient overvoltage conditions. Its clamping behavior is defined by a low incremental surge resistance and tightly controlled VBR tolerance (±5 %), ensuring predictable protection thresholds across temperature.
The device delivers 1500 W peak pulse power handling with a 10/1000 µs waveform at 0.01 % duty cycle, supported by thermal resistance of 15.4 °C/W (junction-to-lead) and 75 °C/W (junction-to-ambient). It exhibits 1.0 µA max reverse leakage at VWM, and forward voltage of 3.5 V at 100 A per JEDEC standard.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 86.5 V / 95.5 V - defines precise avalanche initiation window for reliable overvoltage triggering |
| VWM | 77.8 V - maximum continuous DC or RMS operating voltage before leakage exceeds 1.0 µA |
| VC @ IPPM | 125 V at 12.0 A - clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 1500 W - peak transient energy absorption capacity without failure |
| IFSM | 200 A - non-repetitive forward surge current rating (8.3 ms half-sine), critical for input-stage protection |
| Junction Temp Range | -55 °C to +175 °C - enables deployment in under-hood automotive and industrial environments |
| Package | DO-201AD (Case Style 1.5KE) - axial-leaded, epoxy-molded package rated UL 94 V-0 |
Pinout & Package
Package: DO-201AD (Case Style 1.5KE), axial-leaded, molded epoxy body with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102. Cathode indicated by color band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction or clamping in reverse-biased mode | Connected to protected circuit ground or low-side return path; determines polarity-sensitive placement |
| Cathode | Current exit point; marked with color band | Connected to line/voltage rail being protected; establishes unidirectional clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR and low leakage over lifetime and temperature cycling |
| 1500 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-earth) in properly designed circuits |
| Clamping voltage ratio (VC/VBR) ≈ 1.37 | Minimizes overvoltage overshoot during fast transients, reducing risk to downstream ICs |
| Response time < 1 ns | Engages before most semiconductor damage mechanisms initiate, enabling true pre-failure protection |
| AEC-Q101 qualification option (HE3 suffix) | Validates reliability for automotive powertrain and body electronics applications |
Applications
| Automotive Power Supply Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 12 V/24 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Primary clamping element placed at power entry, shunting surge current away from LDOs and microcontrollers. Use Value: Withstands 125 V clamping at 12 A and 1500 W peak power, preventing latch-up or gate oxide rupture in downstream FETs and regulators. |
Use Scenario: Analog/digital I/O modules in factory automation systems subject to relay coil flyback and ESD events. IC Role / Device Role / Timing Role: Unidirectional TVS on 24 V sensor supply rail and discrete input lines to suppress inductive kick and contact bounce spikes. Use Value: 77.8 V VWM ensures no leakage interference during normal operation; 1.0 µA max ID preserves signal integrity in high-impedance sensing paths. |
| Telecom DC Power Feeds | Consumer Appliance Motor Drive Protection |
Use Scenario: Central office equipment powered via -48 V DC distribution, vulnerable to lightning-induced surges on long copper runs. IC Role / Device Role / Timing Role: First-stage protector on -48 V input before DC/DC converters and line cards. Use Value: 175 °C max junction temperature and UL 94 V-0 epoxy enable safe operation in enclosed telecom cabinets with limited airflow. |
Use Scenario: Brushed DC motor control boards in washing machines or HVAC blowers experiencing commutation spikes. IC Role / Device Role / Timing Role: Parallel-mounted across motor terminals to clamp back-EMF transients exceeding 100 V. Use Value: 200 A IFSM rating handles repetitive 8.3 ms surges from motor switching, extending board lifetime versus Zener-based alternatives. |
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 | DO-214AA package; lower PPPM (600 W); VBR = 100–111 V; VC = 146 V @ 4.1 A | Compact surface-mount alternative for space-constrained PCBs; unsuitable for >1 kA surge requirements | Select SMBJ90A only when board area is critical and peak surge energy remains ≤600 W. |
| 1.5KE91CA | Bidirectional variant; same VBR range (86.5–95.5 V); symmetric clamping in both polarities; no cathode marking | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal may occur | Choose 1.5KE91CA instead of 1.5KE91A-E3/54 only when bidirectional protection is mandated by interface standard or circuit topology. |
Compared with SMBJ90A, 1.5KE91A-E3/54 delivers 2.5× higher surge power handling and axial-leaded robustness for through-hole power rail protection; compared with 1.5KE91CA, it provides lower cost and simpler layout for DC-only applications where polarity is fixed and cathode orientation is controlled.
Availability
1.5KE91A-E3/54 is available at Aetrix Electronics and suitable for automotive power supply protection, industrial PLC input conditioning, and telecom DC feed protection requiring stable component supply, RoHS-compliant sourcing, and traceable lot documentation.
Supply support for 1.5KE91A-E3/54 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, power handling, and automotive-grade qualification.
The 1.5KE series was engineered for high-energy transient suppression in harsh environments, targeting design-in across automotive, industrial, and infrastructure power systems where robustness and consistency are non-negotiable.
FAQ
What is the breakdown voltage tolerance for 1.5KE91A-E3/54?
The 1.5KE91A-E3/54 has a specified breakdown voltage (VBR) range of 86.5 V to 95.5 V at 1.0 mA test current, representing a ±5 % tolerance around the nominal 91 V rating. This tight tolerance ensures consistent clamping behavior across production lots and supports precise overvoltage margining in safety-critical designs.
Is 1.5KE91A-E3/54 RoHS compliant and lead-free?
Yes, the "E3" suffix in 1.5KE91A-E3/54 indicates full RoHS compliance per EU Directive 2011/65/EU, with matte tin-plated leads and lead-free solderability verified per J-STD-002 and JESD 22-B102. The device also passes JESD 201 Class 1A whisker testing, confirming long-term interconnect reliability.
Can 1.5KE91A-E3/54 be used in bidirectional signal protection?
No - 1.5KE91A-E3/54 is strictly unidirectional and must be oriented with its cathode toward the protected line. For bidirectional protection (e.g., RS-485, CAN, or AC-coupled sensors), the 1.5KE91CA variant is required. Using 1.5KE91A-E3/54 in reverse-biased AC applications risks catastrophic failure due to lack of reverse avalanche capability.
What is the maximum clamping voltage of 1.5KE91A-E3/54 under surge conditions?
The maximum clamping voltage (VC) of 1.5KE91A-E3/54 is 125 V at 12.0 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is guaranteed per datasheet Table 1 and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
Does 1.5KE91A-E3/54 meet AEC-Q101 for automotive use?
The base 1.5KE91A-E3/54 is commercial-grade; however, the AEC-Q101 qualified version is designated 1.5KE91AHE3_B (with revision code 'B'). That variant undergoes stress testing per AEC-Q101 Rev D and is approved for automotive powertrain and chassis applications - 1.5KE91A-E3/54 itself is not AEC-Q101 certified.
1.5KE91A-E3/54 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:
- Active
- 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-E3/54 FAQ
1.How can I place an order for 1.5KE91A-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE91A-E3/54 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-E3/54 reliable?
The price and inventory of 1.5KE91A-E3/54 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-E3/54 is usually 5 days.
3.What payment methods are accepted for 1.5KE91A-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE91A-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE91A-E3/54?
1.5KE91A-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE91A-E3/54 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-E3/54?
For technical support, including 1.5KE91A-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE91A-E3/54 requirements.
6.How does Aetrix verify that 1.5KE91A-E3/54 is sourced from the original manufacturer or authorized distributors?
All 1.5KE91A-E3/54 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-E3/54 meets industry standards.
7.What is the process for return or replacement of 1.5KE91A-E3/54?
All 1.5KE91A-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE91A-E3/54, 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-E3/54 part is unused and in its original packaging.
Return procedure for 1.5KE91A-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE91A-E3/54 Tags
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