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Diodes Incorporated 1.5KE91A-T
- Part No.:
- 1.5KE91A-T
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE91A-T.pdf
- Description:
- TVS DIODE 77.8VWM 125VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:7,319
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Product details
Overview
1.5KE91A-T from Diodes Incorporated is a unidirectional 1500W transient voltage suppressor (TVS) diode in DO-201 package, designed for primary overvoltage protection of DC power rails and signal lines. It features a 77.8V reverse standoff voltage, 86.5V minimum breakdown voltage at 1mA test current, 125V maximum clamping voltage at 12A peak pulse current, and operates across –55°C to +175°C. Used in industrial power supplies and automotive ECUs to absorb lightning-induced surges.
For engineers reviewing the 1.5KE91A-T datasheet, 1.5KE91A-T pinout, 1.5KE91A-T application, or 1.5KE91A-T equivalent, this page delivers verified electrical parameters, DO-201 terminal mapping, clamping performance under 1.0ms 8/20μs surge waveforms, thermal derating curves, and RoHS-compliant lead finish details essential for ESD/surge co-design and IEC 61000-4-5 compliance validation.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped crowbar device: it remains high-impedance below 77.8V VRWM, then avalanches sharply at ≥86.5V VBR to limit transient energy. Its glass-passivated junction ensures stable leakage (<5μA at 77.8V) and repeatable clamping at 125V VC under 12A IPP.
The DO-201 axial package supports 5.0W steady-state dissipation at TL=75°C with 9.5mm lead length, and its 1.12g mass enables mechanical stability in high-vibration environments. Fast response time (<1.0ps) and low dynamic impedance ensure effective suppression of sub-nanosecond EFT bursts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500W at 1.0ms non-repetitive pulse - sustains single lightning surge events per IEC 61000-4-5 Level 4 without failure |
| Reverse Standoff Voltage | 77.8V - maximum continuous DC operating voltage before leakage exceeds 5μA; sets system rail margin |
| Breakdown Voltage | 86.5V min @ 1mA - guaranteed avalanche initiation threshold for reliable clamping onset |
| Clamping Voltage | 125V max @ 12A IPP - limits downstream circuit stress during worst-case 8/20μs transients |
| Operating Temperature | –55°C to +175°C - qualified for under-hood automotive and industrial motor drive environments |
| Leakage Current | ≤5.0μA @ 77.8V - negligible standby power loss in always-on systems |
| Package | DO-201 - axial-leaded, epoxy-molded, UL 94V-0 rated housing enabling manual or wave soldering |
Pinout & Package
DO-201 package: axial-leaded, cylindrical glass-passivated epoxy body, 25.4mm overall length, 5.0mm diameter, tin-plated leads solderable per MIL-STD-202 Method 208. Cathode identified by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or lowest potential point; defines clamping reference plane |
| Cathode | Protected line input | Connected to line being protected (e.g., 48V rail); avalanche conduction occurs cathode-to-anode |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Ensures stable VBR tolerance (±5%) and low leakage drift over temperature and lifetime |
| 1500W peak pulse rating | Supports IEC 61000-4-5 4kV/2Ω combination wave testing without degradation |
| RoHS-compliant lead finish | Tin-plated axial leads compatible with Pb-free reflow and wave soldering processes |
| –55°C to +175°C operation | Validated for engine control units, inverters, and industrial PLCs exposed to extreme ambient conditions |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 48V DC input stage of programmable logic controller power supply subjected to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary clamping element placed between input rail and ground, responding within <1ns to suppress >100V transients. Use Value: Limits voltage seen by upstream rectifier and downstream DC-DC controller to ≤125V, preventing MOSFET gate oxide rupture and IC latch-up. |
Use Scenario: LIN bus line protection in door module electronics exposed to ESD and battery reversal events. IC Role / Device Role / Timing Role: Unidirectional shunt protector tied between LIN line and chassis ground, conducting only during positive overvoltage. Use Value: Clamps fast-rising ESD events (IEC 61000-4-2 ±8kV contact) to <125V while maintaining <5μA leakage during normal 12V operation. |
| Telecom Remote Radio Unit (RRU) DC Feed | Renewable Energy Inverter DC Link |
Use Scenario: 24V/48V DC power feed to outdoor 5G remote radio unit, subject to induced lightning surges on long cable runs. IC Role / Device Role / Timing Role: First-line transient suppressor mounted at enclosure entry point, coordinated with secondary MOV/GDT stages. Use Value: Absorbs initial 1500W surge energy within 1ms, reducing residual voltage to downstream filtering components and enabling compact PCB layout. |
Use Scenario: DC link protection in solar string inverters where PV array transients couple into 600–1000V DC bus. IC Role / Device Role / Timing Role: Secondary clamping device across DC bus capacitors, triggered after primary MOV clamping to handle residual overshoot. Use Value: Provides precise 125V clamping ceiling for auxiliary control circuitry referenced to DC bus midpoint, avoiding overvoltage damage to gate drivers. |
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 (Diodes Inc.) | 600W rating, SMB surface-mount package, 90V standoff, 123V clamping at 4.9A IPP | Lower power handling; suited for board-level secondary protection rather than primary surge arrest | Select when space-constrained layouts require SMT mounting and peak surge energy is ≤600W |
| 1N6289 (ON Semiconductor) | 1500W rating, DO-201 package, 85.5V standoff, 117V clamping at 12.8A IPP, same thermal specs | Near-identical clamping performance but tighter VBR tolerance (±3% vs ±5%) and AEC-Q101 qualification | Prefer for automotive applications requiring PPAP documentation and IATF 16949 traceability |
Compared with 1.5KE91A-T, SMBJ90A offers smaller footprint but reduced surge capacity, while 1N6289 matches power and package but adds automotive qualification and tighter VBR control-making it suitable for safety-critical vehicle subsystems where process consistency is mandated.
Availability
1.5KE91A-T is available at Aetrix Electronics and suitable for industrial power supplies, automotive electronic control units, and telecom remote radio units requiring stable component supply and long-term obsolescence management.
Supply support for 1.5KE91A-T 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
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design centers across Asia, Europe, and the US and manufacturing in IATF 16949-certified facilities.
The 1.5KE series belongs to Diodes' transient voltage suppressor product line, engineered specifically for robust, high-energy surge protection in harsh-environment applications including automotive, industrial automation, and infrastructure equipment.
FAQ
What is the maximum clamping voltage of the 1.5KE91A-T under standard test conditions?
The 1.5KE91A-T exhibits a maximum clamping voltage (VC) of 125V when subjected to a 12A peak pulse current (IPP) with a 1.0ms exponential waveform. This value is measured per industry-standard JEDEC test methods and guarantees upper-bound voltage stress on protected circuits during surge events.
Is the 1.5KE91A-T suitable for automotive applications?
The 1.5KE91A-T meets RoHS and halogen-free requirements and operates from –55°C to +175°C, but it is not AEC-Q101 qualified. For automotive use, Diodes recommends the functionally equivalent 1N6289 or contact their automotive team for PPAP-capable alternatives with full change control documentation.
How does the DO-201 package affect thermal performance compared to SMD TVS diodes?
The DO-201's axial leads and 5.0W steady-state power rating at TL=75°C provide superior heat dissipation versus most SMD packages (e.g., SMA/SMB), especially in high-ambient-temperature environments. Its 9.5mm lead length allows direct heatsinking via lead bending or chassis mounting, unlike surface-mount variants limited by PCB copper area.
Can the 1.5KE91A-T be used in bidirectional configurations?
No-the "A" suffix denotes unidirectional operation only. For bidirectional protection at the same voltage rating, use the 1.5KE91CA variant, which has identical standoff and clamping characteristics but symmetrical avalanche behavior for AC or dual-polarity DC lines.
1.5KE91A-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- DO-201
1.5KE91A-T FAQ
1.How can I place an order for 1.5KE91A-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE91A-T 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-T reliable?
The price and inventory of 1.5KE91A-T 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-T is usually 5 days.
3.What payment methods are accepted for 1.5KE91A-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE91A-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE91A-T?
1.5KE91A-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE91A-T 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-T?
For technical support, including 1.5KE91A-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE91A-T requirements.
6.How does Aetrix verify that 1.5KE91A-T is sourced from the original manufacturer or authorized distributors?
All 1.5KE91A-T 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-T meets industry standards.
7.What is the process for return or replacement of 1.5KE91A-T?
All 1.5KE91A-T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE91A-T, 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-T part is unused and in its original packaging.
Return procedure for 1.5KE91A-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE91A-T Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
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D5V0H1B2LP-7B
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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DESD5V0U1BB-7
Diodes Incorporated
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Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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