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Vishay General Semiconductor - Diodes Division 1.5KE9.1A-E3/51
- Part No.:
- 1.5KE9.1A-E3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE9.1A-E3/51.pdf
- Description:
- TVS DIODE 7.78VWM 13.4VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:9,046
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Product details
Overview
1.5KE9.1A-E3/51 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 9.1 V nominal breakdown voltage (VBR = 8.65–9.55 V at IT = 1.0 mA), 13.4 V maximum clamping voltage (VC) at 112 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - used to safeguard MOSFETs, ICs, and sensor interfaces against inductive switching transients and ESD.
For engineers reviewing the 1.5KE9.1A-E3/51 datasheet, 1.5KE9.1A-E3/51 pinout, 1.5KE9.1A-E3/51 application, or 1.5KE9.1A-E3/51 equivalent, this part delivers verified unidirectional clamping performance, RoHS-compliant matte tin-plated leads, JEDEC-standard 1.5KE package, and commercial-grade reliability for industrial and automotive subsystems requiring robust surge immunity without bidirectional symmetry.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds its breakdown threshold, it avalanches rapidly (<1 ns response) to divert transient energy away from downstream circuitry. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling consistent clamping under repetitive 10/1000 µs surges at 0.01% duty cycle.
The device supports unidirectional polarity only (cathode marked by color band), with 7.78 V maximum stand-off voltage (VWM) and 50 µA max reverse leakage at VWM. Thermal design is enabled by RθJA = 75 °C/W and RθJL = 15.4 °C/W, allowing effective heat dissipation through PCB copper or lead-frame conduction in high-reliability power supply inputs and I/O protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 8.65 V / 9.55 V at 1.0 mA test current - defines precise avalanche onset for reliable overvoltage triggering |
| VWM | 7.78 V - maximum continuous reverse operating voltage before leakage exceeds 50 µA |
| VC @ IPPM | 13.4 V at 112 A peak pulse - clamping voltage limiting stress on protected ICs during 10/1000 µs transients |
| PPPM | 1500 W - peak pulse power handling capacity per single 10/1000 µs surge event |
| IPPM | 112 A - maximum non-repetitive surge current the device safely clamps without failure |
| TJ range | –55 °C to +175 °C - extended junction temperature capability for under-hood or industrial environments |
| Package | JEDEC 1.5KE molded epoxy case - industry-standard axial-leaded TO-204AA outline with UL 94 V-0 flammability rating |
Pinout & Package
1.5KE9.1A-E3/51 uses a 2-terminal axial-leaded package (Case Style 1.5KE, TO-204AA). The cathode is identified by a color band; the anode is unmarked. Leads are matte tin-plated and solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node in unidirectional clamp configuration |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 12 V rail or sensor output); color band marks this end |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR drift <0.1%/°C and long-term parameter consistency across thermal cycling |
| 1500 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-ground) in single-device configurations |
| Ultra-fast response time (<1 ns) | Clamps transients before sensitive CMOS inputs or gate drivers experience damaging overvoltage |
| RoHS-compliant E3 suffix | Meets JESD 201 Class 1A whisker resistance and UL 94 V-0 flammability for safety-critical PCBs |
| 175 °C max junction temperature | Enables operation in engine control units, motor drives, and industrial PLCs without derating at full power |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery-fed ECUs exposed to load-dump transients up to 35 V and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional shunt clamping element placed between power rail and chassis ground. Use Value: Limits rail voltage to ≤13.4 V during 112 A surges, preventing damage to 16 V-rated LDOs and microcontrollers. |
Use Scenario: 4–20 mA current-loop sensors in factory automation subject to cable-induced lightning surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on sensor output line before analog front-end amplifier. Use Value: Clamps induced transients within 1 ns while maintaining <50 µA leakage at 7.78 V, preserving loop accuracy. |
| DC-DC Converter Input Protection | Consumer Power Adapter Surge Suppression |
Use Scenario: 24 V input to isolated flyback converter in PoE-powered equipment. IC Role / Device Role / Timing Role: First-stage transient suppressor upstream of input filter capacitor and rectifier. Use Value: Absorbs 1500 W surge energy without degradation, enabling compliance with EN 61000-4-5. |
Use Scenario: Secondary-side 5 V/9 V USB-C adapter outputs exposed to ESD and plug-in surges. IC Role / Device Role / Timing Role: Final-line TVS on regulated output before connector pins. Use Value: Provides 13.4 V clamping ceiling to protect connected devices' USB PHYs and voltage regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ9.0A | Lower PPPM (600 W), smaller SMB package (surface-mount), VC = 14.4 V @ 41.7 A | Better suited for space-constrained PCBs; insufficient for 1500 W IEC 61000-4-5 Level 4 testing | Select when board area is critical and surge requirements are ≤600 W (e.g., secondary-side consumer electronics) |
| 1.5KE9.1CA | Bidirectional variant (no polarity marking), same VBR/VC/PPPM, but rated only up to 220 V VBR max in CA series | Required for AC-coupled or floating signal lines where polarity reversal occurs (e.g., RS-485 bus) | Choose only if bidirectional clamping is mandatory; otherwise 1.5KE9.1A-E3/51 offers superior cost and layout simplicity for DC rails |
Compared with SMBJ9.0A, 1.5KE9.1A-E3/51 delivers 2.5× higher surge power handling in a through-hole package ideal for high-energy industrial transients; versus 1.5KE9.1CA, it provides lower leakage and simpler polarity-aware placement for fixed-polarity DC systems.
Availability
1.5KE9.1A-E3/51 is available at Aetrix Electronics and suitable for automotive power distribution modules, industrial sensor nodes, DC-DC converter inputs, and consumer power adapter outputs requiring stable component supply across multi-year production cycles.
Supply support for 1.5KE9.1A-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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The 1.5KE series was engineered specifically for high-energy transient suppression in harsh-environment power systems, emphasizing ruggedness, repeatable clamping, and long-term stability under thermal and electrical stress.
FAQ
What is the breakdown voltage tolerance of 1.5KE9.1A-E3/51?
The 1.5KE9.1A-E3/51 has a specified breakdown voltage range of 8.65 V to 9.55 V at 1.0 mA test current, representing ±5% tolerance around the nominal 9.1 V rating. This tight VBR window ensures predictable triggering in overvoltage protection circuits without premature conduction or delayed clamping. All units are 100% tested to this specification per Vishay Document 88301.
Is 1.5KE9.1A-E3/51 suitable for automotive applications?
Yes, 1.5KE9.1A-E3/51 meets commercial-grade requirements and is widely deployed in automotive subsystems such as body control modules and infotainment power supplies. While the AEC-Q101 qualified variant is designated 1.5KE9.1AHE3_B, the E3/51 version shares identical electrical characteristics, glass-passivated junction, and 175 °C TJ rating - making it appropriate for non-safety-critical automotive use with proper system-level validation.
How does the clamping voltage of 1.5KE9.1A-E3/51 compare to its breakdown voltage?
The 1.5KE9.1A-E3/51 clamps at 13.4 V when subjected to its rated 112 A peak pulse current (10/1000 µs), which is approximately 40% above its minimum breakdown voltage of 8.65 V. This VC–VBR margin ensures protected ICs see minimal overvoltage stress while maintaining sufficient headroom to avoid false triggering during normal operation at 7.78 V stand-off.
Can 1.5KE9.1A-E3/51 be used in parallel for higher surge current handling?
Yes, multiple 1.5KE9.1A-E3/51 devices can be paralleled to increase total surge current capacity, provided they are matched for VBR (within ±1 V) and mounted with symmetrical thermal paths. Vishay's application notes confirm this technique for extending IEC 61000-4-5 compliance beyond 112 A, though individual device derating and PCB layout balance must be verified per system-level testing.
What is the lead finish and soldering compatibility of 1.5KE9.1A-E3/51?
The 1.5KE9.1A-E3/51 features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, supporting both wave and reflow soldering. It passes JESD 201 Class 1A whisker testing and tolerates solder dip at 275 °C for up to 10 seconds. The E3 suffix confirms full RoHS compliance and suitability for lead-free assembly processes without compromising bond strength or intermetallic formation.
1.5KE9.1A-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):
- 7.78V
- Voltage - Breakdown (Min):
- 8.65V
- Voltage - Clamping (Max) @ Ipp:
- 13.4V
- Current - Peak Pulse (10/1000µs):
- 112A
- 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
1.5KE9.1A-E3/51 FAQ
1.How can I place an order for 1.5KE9.1A-E3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE9.1A-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 1.5KE9.1A-E3/51 reliable?
The price and inventory of 1.5KE9.1A-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 1.5KE9.1A-E3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE9.1A-E3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE9.1A-E3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE9.1A-E3/51?
1.5KE9.1A-E3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE9.1A-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 1.5KE9.1A-E3/51?
For technical support, including 1.5KE9.1A-E3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE9.1A-E3/51 requirements.
6.How does Aetrix verify that 1.5KE9.1A-E3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE9.1A-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 1.5KE9.1A-E3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE9.1A-E3/51?
All 1.5KE9.1A-E3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE9.1A-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 1.5KE9.1A-E3/51 part is unused and in its original packaging.
Return procedure for 1.5KE9.1A-E3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE9.1A-E3/51 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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