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Vishay General Semiconductor - Diodes Division 1.5KA9.1AHE3/51
- Part No.:
- 1.5KA9.1AHE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KA9.1AHE3/51.pdf
- Description:
- TVS DIODE 7.78VWM 13.4VC 1.5KA
- Quantity:
- Payment:
- Shipping:
Inventory:3,082
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Product details
Overview
1.5KA9.1AHE3/51 from Vishay General Semiconductor is an automotive-grade unidirectional transient voltage suppressor (TVS) diode designed for high-energy surge protection in power and signal lines. It delivers 1500 W peak pulse power (10/1000 µs), clamps at 13.4 V under 112 A peak pulse current, and operates up to +185 °C junction temperature - deployed in automotive sensor interface circuits exposed to load dump and inductive switching transients.
For engineers reviewing the 1.5KA9.1AHE3/51 datasheet, 1.5KA9.1AHE3/51 pinout, 1.5KA9.1AHE3/51 application, or 1.5KA9.1AHE3/51 equivalent, key selection criteria include breakdown voltage tolerance (8.65–9.55 V), clamping performance at rated IPPM, AEC-Q101 qualification status, thermal derating above 25 °C, and RoHS-compliant HE3 packaging with JESD201 Class 2 whisker resistance.
Technical Context
This TVS diode employs Vishay's patented PAR® construction for stable clamping under repetitive surge stress and maintains low incremental surge resistance (<0.1 Ω typical) to minimize voltage overshoot during fast transients. Its unidirectional polarity and 1.0 mA test current ensure precise standoff voltage definition at 7.78 V.
Rated for operation from –65 °C to +185 °C, it supports automotive under-hood environments and complies with ANSI/IEEE C62.35 surge waveform standards. The device uses a molded epoxy case (UL 94 V-0) with matte tin-plated leads solderable per J-STD-002 and JESD22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 1500 W - sustains automotive ISO 7637-2 Pulse 5a load dump surges without failure |
| Breakdown Voltage VBR | 8.65–9.55 V at 1.0 mA - ensures reliable triggering before downstream IC damage threshold |
| Clamping Voltage VC | 13.4 V at 112 A - limits protected circuit voltage to safe level during full-rated surge |
| Standoff Voltage VWM | 7.78 V - provides margin below system nominal 8–9 V rail while blocking leakage |
| Max Reverse Leakage ID | 50 µA at VWM, 150 °C - enables low-power sensor bias integrity over full temp range |
| Junction Temperature Range | –65 °C to +185 °C - qualified for engine control unit (ECU) and transmission control module locations |
| AEC-Q101 Qualified | Yes - validated for automotive reliability including HTGB, HTRB, and temperature cycling |
Pinout & Package
Package: Case Style 1.5KA - axial-leaded DO-201AD molded epoxy package (1.0" min. lead length, 0.210" body diameter). Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge return path | Connected to ground or low-impedance reference; carries full IPPM during clamping |
| Cathode | Protected line connection | Connected to line being protected (e.g., sensor supply); voltage referenced to anode during conduction |
Key Features
| Feature | Design Value |
|---|---|
| Patented PAR® construction | Enables consistent VBR stability across 1000+ surge events without parameter drift |
| 1500 W peak pulse rating (10/1000 µs) | Meets ISO 7637-2 Pulse 5a requirements for 12 V automotive systems |
| HE3 suffix packaging | RoHS-compliant, AEC-Q101 qualified, and JESD201 Class 2 whisker resistant |
| Low clamping ratio (VC/VBR ≈ 1.40) | Minimizes overvoltage stress on downstream MOSFETs or analog front-ends |
| 185 °C max junction temperature | Supports placement near heat sources (e.g., power converters) without derating penalties |
Applications
| Automotive Sensor Protection | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Protecting Hall-effect and crankshaft position sensors from inductive kickback during solenoid actuation. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between sensor VCC and ground, triggered within <1 ns of transient onset. Use Value: Prevents latch-up or gate oxide rupture in sensor ASICs by limiting voltage to ≤13.4 V during 100 A transients. |
Use Scenario: Safeguarding ECU microcontroller power rails against battery load dump (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Primary surge suppression device on 12 V input, operating in avalanche breakdown mode. Use Value: Absorbs 1500 W surge energy without degradation, maintaining system uptime and avoiding fuse blowout. |
| Industrial Motor Drive Feedback Lines | Telecom DC Power Interface |
Use Scenario: Shielding encoder and resolver feedback signals from commutation noise in BLDC inverters. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ < 100 pF) placed differential-mode across signal pair. Use Value: Clamps transients to 13.4 V while preserving signal integrity up to 1 MHz due to fast response and minimal parasitic loading. |
Use Scenario: Protecting PoE-powered equipment DC inputs from lightning-induced surges on outdoor telecom lines. IC Role / Device Role / Timing Role: Secondary-level TVS on 48 V DC input, coordinated with upstream GDT or MOV. Use Value: Provides precise 7.78 V standoff and 13.4 V clamping to avoid brownout during surge recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ9.0A-E3/52 | Lower PPPM (600 W), smaller SMB package (lower thermal mass), VBR = 10.0–11.1 V | Better suited for space-constrained PCBs with lower surge exposure (e.g., infotainment USB ports) | Select when board area is critical and surge threat level is ≤600 W; verify thermal relief for continuous power dissipation. |
| 1.5KE9.1A | Same VBR range but non-automotive grade; no AEC-Q101 qualification; PD = 5.0 W (vs. 6.5 W) | Acceptable for industrial/commercial power supplies where automotive reliability not mandated | Choose for cost-sensitive non-automotive designs; avoid in safety-critical vehicle subsystems requiring AEC-Q101 traceability. |
Compared with 1.5KA9.1AHE3/51, SMBJ9.0A-E3/52 trades surge robustness for footprint reduction, while 1.5KE9.1A sacrifices automotive qualification and thermal capability for broader commercial availability - making 1.5KA9.1AHE3/51 the only option meeting full AEC-Q101, 1500 W, and 185 °C requirements in its voltage class.
Availability
1.5KA9.1AHE3/51 is available at Aetrix Electronics and suitable for automotive sensor interfaces, engine control units, industrial motor feedback systems, and telecom DC power inputs requiring stable component supply across extended temperature and high-reliability operational life.
Supply support for 1.5KA9.1AHE3/51 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 high-reliability diodes, MOSFETs, and passive components for demanding industrial and automotive applications.
The 1.5KA series was engineered specifically for AEC-Q101-compliant transient suppression in harsh automotive environments, emphasizing thermal resilience, surge consistency, and long-term parametric stability under cyclic stress.
FAQ
What is the exact breakdown voltage range for the 1.5KA9.1AHE3/51?
The 1.5KA9.1AHE3/51 has a guaranteed breakdown voltage (VBR) range of 8.65 V to 9.55 V at 1.0 mA test current, measured per ANSI/IEEE C62.35. This tight tolerance ensures predictable turn-on behavior in automotive 9 V nominal systems and avoids false triggering during normal voltage ripple.
Is the 1.5KA9.1AHE3/51 qualified to AEC-Q101 standards?
Yes, the 1.5KA9.1AHE3/51 is explicitly AEC-Q101 qualified, as confirmed in the Vishay document 88300 revision 20-Oct-08, Note (1). This qualification covers HTGB, HTRB, temperature cycling, and mechanical shock testing - validating its use in automotive powertrain and chassis modules.
What does the HE3 suffix indicate on the 1.5KA9.1AHE3/51?
The HE3 suffix on the 1.5KA9.1AHE3/51 denotes RoHS-compliant, high-reliability automotive-grade construction: matte tin-plated leads compliant with J-STD-002 and JESD22-B102, and passing JESD201 Class 2 whisker testing - essential for long-life solder joint integrity in vibration-prone automotive assemblies.
How does the clamping voltage of the 1.5KA9.1AHE3/51 compare to its breakdown voltage?
The 1.5KA9.1AHE3/51 clamps at 13.4 V when subjected to its rated 112 A peak pulse current (10/1000 µs), yielding a clamping ratio (VC/VBR) of approximately 1.40. This low ratio reflects efficient avalanche conduction and minimizes overvoltage stress on protected ICs compared to higher-ratio alternatives.
Can the 1.5KA9.1AHE3/51 be used in bidirectional configurations?
No, the 1.5KA9.1AHE3/51 is unidirectional only, as stated in the Vishay datasheet features section. Its cathode-band marking and internal structure support conduction from cathode to anode only. For bidirectional protection, a separate device such as the 1.5KAS9.0A must be selected.
1.5KA9.1AHE3/51 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- PAR®
- 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:
- -65°C ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KA
1.5KA9.1AHE3/51 FAQ
1.How can I place an order for 1.5KA9.1AHE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KA9.1AHE3/51 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 1.5KA9.1AHE3/51 reliable?
The price and inventory of 1.5KA9.1AHE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KA9.1AHE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KA9.1AHE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KA9.1AHE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KA9.1AHE3/51?
1.5KA9.1AHE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KA9.1AHE3/51 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 1.5KA9.1AHE3/51?
For technical support, including 1.5KA9.1AHE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KA9.1AHE3/51 requirements.
6.How does Aetrix verify that 1.5KA9.1AHE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KA9.1AHE3/51 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 1.5KA9.1AHE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KA9.1AHE3/51?
All 1.5KA9.1AHE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KA9.1AHE3/51, 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 1.5KA9.1AHE3/51 part is unused and in its original packaging.
Return procedure for 1.5KA9.1AHE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KA9.1AHE3/51 Tags
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