My Inquiry
My Account
Vishay General Semiconductor - Diodes Division 1.5KE91CAHE3/51
- Part No.:
- 1.5KE91CAHE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE91CAHE3/51.pdf
- Description:
- TVS DIODE 77.8VWM 125VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:9,309
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1.5KE91CAHE3/51 from Vishay General Semiconductor is a bi-directional Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 91 V breakdown voltage (VBR = 86.5–95.5 V at 1 mA), 1500 W peak pulse power (10/1000 µs), clamping voltage of 125 V at 12 A, ±10% VBR tolerance, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the 1.5KE91CAHE3/51 datasheet, 1.5KE91CAHE3/51 pinout, 1.5KE91CAHE3/51 application, or 1.5KE91CAHE3/51 equivalent, this device serves as a critical front-end protection component against lightning-induced surges, inductive switching transients, and ESD events in automotive sensor interfaces, industrial I/O modules, and telecom line cards - where fast response (<1 ns), low clamping ratio, and stable high-temperature operation up to 175 °C are required.
Technical Context
This bi-directional TVS operates symmetrically in both polarities with identical electrical characteristics - no cathode marking, no polarity dependency. Its glass-passivated junction enables stable VBR drift (±0.106 %/°C) and low incremental surge resistance, supporting consistent clamping performance across temperature and repeated transient events.
The device uses a DO-201AD package with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102, rated for solder dip at 275 °C (10 s), and meets UL 94 V-0 flammability. The HE3 suffix confirms RoHS compliance and AEC-Q101 qualification per revision A (1.5KE91CAHE3_A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VBR | 86.5–95.5 V at 1 mA - defines precise clamping onset threshold for bidirectional surge suppression |
| Stand-off Voltage VWM | 77.8 V - maximum continuous working voltage before leakage exceeds 1 µA; ensures no false triggering during normal operation |
| Clamping Voltage VC | 125 V at 12 A (10/1000 µs) - limits transient voltage seen by downstream ICs to safe levels |
| Peak Pulse Power PPPM | 1500 W - sustains high-energy transients (e.g., ISO 7637-2 Pulse 5a) without failure |
| Operating Temperature | –55 °C to +175 °C - supports under-hood automotive and industrial environments without derating |
| Leakage Current ID | ≤1 µA at 77.8 V - negligible standby power loss and minimal impact on high-impedance circuits |
| Response Time | <1 ns - clamps before sensitive components experience damaging overvoltage |
Pinout & Package
Package: DO-201AD (Case Style 1.5KE), axial-leaded, molded epoxy body meeting UL 94 V-0. Bi-directional configuration has no polarity marking - terminals are functionally interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (either lead) | Transient current path | Bi-directional conduction - either terminal serves as anode or cathode depending on transient polarity; no PCB orientation constraint |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity stress |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive applications including engine control, ADAS sensors, and infotainment power rails |
| 1500 W peak pulse rating (10/1000 µs) | Withstands high-energy load-dump and lightning-surge waveforms without degradation |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes voltage overshoot across protected circuitry, reducing risk of latch-up or gate oxide damage |
| Matte tin-plated leads | Guarantees reliable solderability per J-STD-002 and eliminates whisker growth risk (JESD 201 Class 2) |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed directly at connector entry point, operating in bi-directional mode to suppress both positive and negative transients. Use Value: Prevents permanent damage to 5 V or 3.3 V interface ICs by limiting transient voltage to ≤125 V while maintaining <1 µA leakage at 77.8 V nominal supply. |
Use Scenario: Safeguarding digital input/output channels on programmable logic controllers exposed to inductive kickback from solenoids and motors. IC Role / Device Role / Timing Role: Standalone transient suppressor mounted across field-side terminals, absorbing repetitive 1500 W surges without thermal runaway. Use Value: Enables >100,000 surge cycles at rated power due to low RθJL (15.4 °C/W) and 175 °C max junction temperature. |
| Telecom Line Interface | Power Supply Input Stage |
Use Scenario: Front-end protection for DSL or Ethernet PHY interfaces subjected to lightning-induced surges on outdoor copper lines. IC Role / Device Role / Timing Role: First-line defense in series with common-mode chokes, clamping differential and common-mode transients simultaneously. Use Value: Sub-1 ns response time ensures clamping occurs before transients propagate into transformer-coupled circuitry, preserving signal integrity. |
Use Scenario: DC input rail protection in AC/DC adapters and industrial power supplies against AC line surges and switching transients. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor input, shunting surge energy away from rectifier and controller ICs. Use Value: 1500 W rating handles IEC 61000-4-5 Level 4 (4 kV) surges; 77.8 V VWM allows use with 72 V nominal DC systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90CA | Lower PPPM (600 W), smaller SMB package (vs. DO-201AD), higher VC/VBR ratio (1.37) | Better suited for space-constrained PCBs; less robust for high-energy automotive load dump | Select when board area is critical and surge energy is limited to IEC 61000-4-5 Level 2 (1 kV) |
| 1.5SMC91CA | Same PPPM (1500 W) and VBR, but SMC package (DO-214AB); slightly higher VC (127 V) | Surface-mount alternative enabling automated assembly; lower thermal resistance to PCB than axial DO-201AD | Choose for reflow-compatible designs requiring same clamping performance and AEC-Q101 qualification |
Compared with SMBJ90CA and 1.5SMC91CA, the 1.5KE91CAHE3/51 offers superior thermal dissipation via axial leads and proven ruggedness in high-reliability automotive harness environments - making it preferred where mechanical robustness, manual repairability, and legacy through-hole compatibility are design priorities.
Availability
1.5KE91CAHE3/51 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O protection, telecom line interfaces, and DC power supply input stages requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1.5KE91CAHE3/51 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 family was engineered specifically for high-energy transient suppression in harsh environments - delivering consistent clamping performance, AEC-Q101 validation, and robust packaging for under-hood and factory-floor applications.
FAQ
What is the exact breakdown voltage range for 1.5KE91CAHE3/51?
The 1.5KE91CAHE3/51 has a guaranteed breakdown voltage (VBR) range of 86.5 V to 95.5 V at a test current of 1 mA, per Vishay Document 88301. This ±5% tolerance ensures predictable clamping onset across production lots and temperature extremes, critical for protecting 72 V nominal systems where overvoltage margin must be tightly controlled. The bi-directional symmetry means this range applies identically in both polarities.
Is 1.5KE91CAHE3/51 qualified for automotive applications?
Yes, the HE3 suffix on 1.5KE91CAHE3/51 explicitly denotes AEC-Q101 qualification per revision A, verified for automotive use per Vishay's documentation. It is rated for operation from –55 °C to +175 °C, passes JESD 201 Class 2 whisker testing, and supports solder reflow and dip processes used in automotive module manufacturing - making 1.5KE91CAHE3/51 suitable for engine control units, ADAS camera modules, and body electronics.
How does the clamping voltage of 1.5KE91CAHE3/51 compare to its breakdown voltage?
The 1.5KE91CAHE3/51 clamps to 125 V at 12 A (10/1000 µs waveform), yielding a clamping ratio (VC/VBR) of approximately 1.31 - calculated using the nominal VBR midpoint (91 V). This low ratio reflects efficient energy absorption and minimal voltage overshoot, directly protecting downstream 100 V-rated MOSFETs or 3.3 V/5 V logic interfaces without requiring additional series impedance.
What package type does 1.5KE91CAHE3/51 use, and what are its key mechanical properties?
The 1.5KE91CAHE3/51 uses the DO-201AD axial package (Case Style 1.5KE), featuring a molded epoxy body rated UL 94 V-0, matte tin-plated leads compliant to J-STD-002, and a maximum solder dip tolerance of 275 °C for 10 seconds. Its 0.375" (9.5 mm) lead length and 15.4 °C/W junction-to-lead thermal resistance enable effective heat dissipation in through-hole mounting configurations.
Does 1.5KE91CAHE3/51 require polarity-aware PCB layout?
No - the "CA" suffix indicates bi-directional functionality, and the 1.5KE91CAHE3/51 has no polarity marking or cathode band. Either lead functions as anode or cathode depending on transient polarity, eliminating orientation constraints during placement. This simplifies assembly and avoids misorientation failures common with uni-directional TVS devices.
1.5KE91CAHE3/51 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:
- -
- Bidirectional Channels:
- 1
- 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
1.5KE91CAHE3/51 FAQ
1.How can I place an order for 1.5KE91CAHE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE91CAHE3/51 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 1.5KE91CAHE3/51 reliable?
The price and inventory of 1.5KE91CAHE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE91CAHE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE91CAHE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE91CAHE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE91CAHE3/51?
1.5KE91CAHE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE91CAHE3/51 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 1.5KE91CAHE3/51?
For technical support, including 1.5KE91CAHE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE91CAHE3/51 requirements.
6.How does Aetrix verify that 1.5KE91CAHE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE91CAHE3/51 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 1.5KE91CAHE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE91CAHE3/51?
All 1.5KE91CAHE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE91CAHE3/51, 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 1.5KE91CAHE3/51 part is unused and in its original packaging.
Return procedure for 1.5KE91CAHE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE91CAHE3/51 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
