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Vishay General Semiconductor - Diodes Division 1.5KE9.1AHE3/51
- Part No.:
- 1.5KE9.1AHE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE9.1AHE3/51.pdf
- Description:
- TVS DIODE 7.78VWM 13.4VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:2,237
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Product details
Overview
1.5KE9.1AHE3/51 from Vishay General Semiconductor is a uni-directional Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection of DC power rails and signal lines. It features a 9.1 V breakdown voltage (VBR = 8.65–9.55 V at IT = 1.0 mA), 7.78 V maximum working voltage (VWM), 13.4 V clamping voltage (VC) at 112 A peak pulse current, 1500 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the 1.5KE9.1AHE3/51 datasheet, 1.5KE9.1AHE3/51 pinout, 1.5KE9.1AHE3/51 application, or 1.5KE9.1AHE3/51 equivalent, this device serves as a robust, fast-response (≤1 ns), glass-passivated TVS for protecting sensitive MOSFETs, microcontrollers, and sensor interfaces against inductive switching transients and ESD in automotive body electronics and industrial control systems.
Technical Context
This uni-directional TVS operates by avalanche breakdown to clamp transient voltages above its VBR threshold while maintaining low leakage (<50 µA at VWM). Its 1500 W peak pulse power rating is defined under standardized 10/1000 µs waveform conditions with 0.01% duty cycle, and it exhibits a temperature coefficient of +0.068 %/°C for VBR.
The device uses a molded epoxy case (Case Style 1.5KE) with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102, and meets UL 94 V-0 flammability rating. The HE3 suffix denotes RoHS compliance and AEC-Q101 qualification-confirmed for 1.5KE6.8AHE3_A through 1.5KE220AHE3_A variants per datasheet note (2).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 8.65 V / 9.55 V at IT = 1.0 mA - defines precise avalanche onset range for reliable clamping initiation |
| VWM | 7.78 V - maximum continuous reverse operating voltage before significant leakage begins |
| VC @ IPPM | 13.4 V at 112 A - clamped voltage during worst-case 1500 W transient, limiting stress on downstream ICs |
| IPPM | 112 A - peak surge current capability under 10/1000 µs waveform, enabling protection against high-energy transients |
| PPPM | 1500 W - standardized peak pulse power handling, critical for automotive load-dump and ISO 7637-2 compliance |
| TJ max. | +175 °C - extended junction temperature rating supports under-hood automotive deployment |
| AEC-Q101 | Qualified - validated for automotive electronic modules requiring zero-failure reliability in harsh environments |
Pinout & Package
Package: Case Style 1.5KE - axial-leaded, molded epoxy body (0.375" lead length), UL 94 V-0 rated, 0.968 g unit weight. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in uni-directional configuration |
| Cathode | Avalanche clamping terminal | Marked with color band; connected to protected line (e.g., 12 V rail or signal input) to shunt transients to ground |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable, repeatable avalanche characteristics and long-term reliability under thermal cycling |
| 1500 W peak pulse power (10/1000 µs) | Supports robust protection against ISO 7637-2 Pulse 1, 2a, 3a/b, and load-dump surges in 12 V automotive systems |
| ≤1 ns response time | Clamps transients before they propagate into sensitive logic or analog circuitry, preventing latch-up or gate oxide damage |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive applications including body control modules, lighting drivers, and sensor interfaces |
| Low incremental surge resistance | Minimizes VC overshoot during high di/dt events, improving clamping precision and system margin |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting microcontroller GPIO and CAN transceiver power rails from load-dump and inductive kickback in door module ECUs. IC Role / Device Role / Timing Role: Uni-directional TVS placed between 12 V supply and ground, clamping transients before they reach LDOs and MCU VCC pins. Use Value: Limits clamped voltage to 13.4 V during 112 A surges, ensuring downstream 16 V-rated components remain within safe operating area. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Primary protection device mounted at connector entry point, shunting energy directly to chassis ground. Use Value: Withstands repetitive 1500 W pulses at 0.01% duty cycle, enabling reliable operation in factory automation environments with frequent switching events. |
| Consumer Appliance Motor Drive | Automotive LED Headlamp Driver |
Use Scenario: Shielding MCU-based motor control circuits in washing machines and HVAC blowers from brush-commutator arcing and relay bounce. IC Role / Device Role / Timing Role: DC bus TVS on H-bridge supply rail, triggered only during abnormal overvoltage events-not during normal PWM operation. Use Value: 7.78 V VWM ensures no conduction during nominal 6–9 V DC operation, eliminating standby power loss or false triggering. |
Use Scenario: Protecting constant-current LED driver ICs and external FET gates from battery reverse polarity and jump-start transients. IC Role / Device Role / Timing Role: Uni-directional suppressor on input stage, oriented to block reverse voltage while clamping positive surges. Use Value: AEC-Q101 qualification and 175 °C TJ max. ensure uninterrupted operation in sealed headlamp housings with ambient temperatures up to +125 °C. |
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), VBR = 10.0–11.1 V, VC = 14.4 V @ 41.7 A | Designed for PCB space-constrained designs; lacks AEC-Q101 qualification in standard grade | Select when board area is limited and automotive qualification is not required; verify thermal derating for 1500 W-level threats. |
| 1.5KE9.1A-E3/54 | Same electrical specs and 1.5KE package, but commercial-grade (E3 suffix only); no AEC-Q101 validation | Approved for industrial/commercial use only; not certified for automotive production | Choose for cost-sensitive non-automotive applications where full AEC-Q101 traceability is unnecessary. |
Compared with 1.5KE9.1AHE3/51, SMBJ9.0A trades peak power and qualification for compactness, while 1.5KE9.1A-E3/54 retains identical form-factor and performance but omits automotive reliability validation-making the HE3/51 uniquely suited for Tier-1 automotive BOMs requiring auditable AEC-Q101 compliance.
Availability
1.5KE9.1AHE3/51 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input stages, and consumer appliance motor control systems requiring stable component supply, AEC-Q101 traceability, and 1500 W transient immunity.
Supply support for 1.5KE9.1AHE3/51 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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The 1.5KE series was engineered specifically for high-energy transient suppression in automotive and industrial power systems, delivering standardized 1500 W pulse handling in a rugged axial-leaded package optimized for manual and wave-solder assembly.
FAQ
What is the breakdown voltage tolerance of the 1.5KE9.1AHE3/51?
The 1.5KE9.1AHE3/51 has a specified breakdown voltage range of 8.65 V to 9.55 V at test current IT = 1.0 mA, representing ±5% tolerance around the nominal 9.1 V rating. This tight VBR window ensures consistent clamping behavior across production lots and supports predictable system-level overvoltage margining in designs using the 1.5KE9.1AHE3/51.
Is the 1.5KE9.1AHE3/51 suitable for bi-directional transient protection?
No-the 1.5KE9.1AHE3/51 is strictly a uni-directional TVS diode, as indicated by the "A" suffix and confirmed by its cathode-band marking and forward voltage specification (VF = 3.5 V at 100 A). For bi-directional protection, Vishay offers the 1.5KE9.1CA variant; using the 1.5KE9.1AHE3/51 in AC or floating applications risks permanent failure due to forward conduction during negative half-cycles.
What does the "HE3/51" suffix mean in 1.5KE9.1AHE3/51?
The "HE3" suffix denotes RoHS-compliant construction and AEC-Q101 qualification per Vishay's documentation (note 2, page 3), while "/51" specifies the packaging option: 13" diameter paper tape and reel with 51 units per reel segment. This distinguishes it from alternate reels (e.g., /54 = 1400 units/reel) and confirms full automotive-grade traceability for the 1.5KE9.1AHE3/51.
How does the 1.5KE9.1AHE3/51 compare to standard Zener diodes for surge protection?
Unlike general-purpose Zeners, the 1.5KE9.1AHE3/51 is engineered for high-energy transient suppression: it delivers 1500 W peak pulse power (vs. typically <5 W for Zeners), sub-nanosecond response, and robust surge current handling (112 A). Its glass-passivated junction and thermal design sustain repeated transients without parameter drift-making the 1.5KE9.1AHE3/51 appropriate for surge protection, whereas Zeners are unsuited for such duty cycles.
Can the 1.5KE9.1AHE3/51 be used in parallel to increase power handling?
Yes-Vishay explicitly states in the Application Notes that TVS diodes like the 1.5KE9.1AHE3/51 can be used in parallel to increase peak power ratings. However, matching VBR (within 5%) and using symmetrical PCB layout with equal trace inductance is essential to ensure current sharing; mismatched units may cause one 1.5KE9.1AHE3/51 to absorb disproportionate energy and fail prematurely.
1.5KE9.1AHE3/51 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE9.1AHE3/51 FAQ
1.How can I place an order for 1.5KE9.1AHE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE9.1AHE3/51 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 1.5KE9.1AHE3/51 reliable?
The price and inventory of 1.5KE9.1AHE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE9.1AHE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE9.1AHE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE9.1AHE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE9.1AHE3/51?
1.5KE9.1AHE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE9.1AHE3/51 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 1.5KE9.1AHE3/51?
For technical support, including 1.5KE9.1AHE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE9.1AHE3/51 requirements.
6.How does Aetrix verify that 1.5KE9.1AHE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE9.1AHE3/51 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 1.5KE9.1AHE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE9.1AHE3/51?
All 1.5KE9.1AHE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE9.1AHE3/51, 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 1.5KE9.1AHE3/51 part is unused and in its original packaging.
Return procedure for 1.5KE9.1AHE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE9.1AHE3/51 Tags
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