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onsemi 1.5KE91ARL4G
- Part No.:
- 1.5KE91ARL4G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1.5KE91ARL4G.pdf
- Description:
- TVS DIODE 77.8VWM 125VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:108,000
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Product details
Overview
1.5KE91ARL4G from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel clamping protection of sensitive electronics. It features a 77.8 V working peak reverse voltage (VRWM), 91 V nominal breakdown voltage (VBR), and clamps to ≤125 V at 12 A peak pulse current (IPP), making it suitable for protecting power supplies and industrial control interfaces against ESD and lightning-induced surges.
For engineers reviewing the 1.5KE91ARL4G datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin over operating voltage, clamping ratio (VC/VBR ≈ 1.37), low zener impedance, sub-1 ns response time, and UL 497B recognition for isolated loop circuit protection.
Technical Context
This TVS operates in avalanche breakdown mode with tightly controlled VBR tolerance (±5% typical), exhibiting low dynamic impedance (<1 Ω) during transient events. Its thermal resistance (RJL = 20 °C/W) and 175 °C maximum junction temperature support robust surge handling under repeated 1 ms pulses.
The device uses a Surmetic axial-leaded plastic package (Case 41A) with cathode polarity band marking and Pb-free construction. It delivers Class 3 ESD immunity (>16 kV HBM) and meets UL 497B requirements for telecom and process control isolation barriers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1 ms - sustains single high-energy transients without failure |
| Working Peak Reverse Voltage | 77.8 V - sets minimum DC/continuous operating voltage threshold before leakage rises |
| Breakdown Voltage | 91 V ±5% @ 1 mA - defines precise avalanche onset for predictable clamping |
| Clamping Voltage | ≤125 V @ 12 A IPP - limits protected circuit voltage during worst-case surge |
| Leakage Current | <5 µA @ 77.8 V - ensures negligible standby power loss in high-impedance circuits |
| Response Time | <1 ns - enables suppression before downstream ICs experience overstress |
| ESD Rating | Class 3 (>16 kV HBM) - exceeds IEC 61000-4-2 Level 4 for system-level ESD robustness |
Pinout & Package
1.5KE91ARL4G is housed in an axial-leaded Surmetic plastic package (Case 41A), with cathode identified by a colored band. Leads are tin-plated, solderable at 260 °C for 10 seconds at 1/16 inch from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection in unidirectional clamp configuration | Connected to ground or common reference; completes conduction path during reverse surge |
| Cathode | High-side connection with polarity band marking | Connected to protected line; blocks normal operation but avalanches during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Validated for isolated loop circuit protection in telecom and industrial interfaces |
| Low Clamping Ratio | VC/VBR ≈ 1.37 ensures minimal overvoltage stress on downstream CMOS/MOS ICs |
| Pb-Free Construction | RoHS-compliant Surmetic package with fully solderable, corrosion-resistant leads |
| Thermal Robustness | RJL = 20 °C/W enables reliable 1500 W pulse dissipation with short lead heatsinking |
Applications
| Industrial Power Supply Protection | Telecom Line Interface |
|---|---|
Use Scenario: Protecting 48 V DC input rails in programmable logic controllers against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed across input terminals to shunt surge energy to ground. Use Value: Limits transient voltage to ≤125 V, preventing damage to upstream DC-DC converters and microcontrollers rated for 36–60 V operation. | Use Scenario: Safeguarding RS-485 transceivers connected to long outdoor cables exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on differential bus lines, referenced to isolated ground. Use Value: UL 497B certification confirms suitability for isolated loop protection, ensuring compliance in safety-critical telecom infrastructure. |
| Medical Equipment Input Stage | Process Control Signal Conditioning |
Use Scenario: Shielding analog front-end inputs of patient monitoring devices from ESD events during clinical handling. IC Role / Device Role / Timing Role: Low-leakage (≤5 µA) TVS on signal lines to preserve accuracy while enabling fast transient response. Use Value: Sub-1 ns response and Class 3 HBM rating prevent latch-up or parametric shift in precision op-amps and ADCs. | Use Scenario: Protecting 4–20 mA current loop receivers in factory automation systems from ground potential differences and cable coupling. IC Role / Device Role / Timing Role: Bidirectional protection not required; unidirectional 1.5KE91ARL4G used on positive rail with proper biasing. Use Value: 77.8 V VRWM provides sufficient margin above 24 V loop supply, minimizing false triggering during normal operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1.5KE91A | Same electrical specs; axial lead, bulk-packaged (500 units/box) instead of tape-and-reel | No difference in circuit function; differs only in packaging format and moisture sensitivity | Select 1.5KE91A for manual assembly or low-volume prototyping where reel handling is unnecessary |
| SMBJ90A | Surface-mount SMB package; 90 V VBR, 1000 W PPK, lower IPP (10.3 A), higher VRWM (77.5 V) | Requires PCB redesign; better suited for space-constrained designs with automated placement | Choose SMBJ90A when board area is limited and SMT assembly is standard; verify thermal pad layout for 1000 W pulse handling |
Compared with 1.5KE91ARL4G, the 1.5KE91A offers identical protection performance in through-hole form but lacks tape-and-reel convenience for high-volume production, while SMBJ90A trades 500 W peak power and axial mounting for compact SMT integration-requiring layout changes and derating for equivalent surge capability.
Availability
1.5KE91ARL4G is available at Aetrix Electronics and suitable for industrial power supplies, telecom line interfaces, medical equipment inputs, and process control signal conditioning requiring stable component supply and UL-recognized surge protection.
Supply support for 1.5KE91ARL4G 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
ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensors, and discrete devices for automotive, industrial, and communications markets.
The 1.5KE91ARL4G belongs to the 1.5KE series of Mosorb Zener TVS diodes, engineered for cost-effective, high-reliability transient suppression in high-energy surge environments such as power supplies and industrial controls.
FAQ
What is the clamping voltage of the 1.5KE91ARL4G at its rated peak pulse current?
The 1.5KE91ARL4G clamps to a maximum of 125 V at its specified peak pulse current of 12 A (IPP), as defined in the ON Semiconductor datasheet under Electrical Characteristics. This VC value ensures downstream components see limited overvoltage during standardized 1 ms transient events. The 1.5KE91ARL4G maintains this clamping performance across its qualified temperature range and is validated per JEDEC test conditions.
Is the 1.5KE91ARL4G RoHS compliant and lead-free?
Yes, the 1.5KE91ARL4G is Pb-free and RoHS compliant, indicated by the "G" suffix in its part number per ON Semiconductor's packaging nomenclature. Its Surmetic axial package uses lead-free terminations and complies with J-STD-609 Category 1 moisture sensitivity level. The 1.5KE91ARL4G meets all applicable EU RoHS directives and is suitable for environmentally regulated industrial and medical applications.
How does the 1.5KE91ARL4G differ from bidirectional TVS diodes?
The 1.5KE91ARL4G is unidirectional and functions like a Zener diode-blocking forward current and clamping only reverse overvoltages above its breakdown voltage. Unlike bidirectional types, it cannot suppress symmetrical AC transients. The 1.5KE91ARL4G is optimized for DC-biased lines such as power rails or single-polarity signal paths where polarity is fixed and reverse surge risk dominates.
What is the maximum steady-state power dissipation for the 1.5KE91ARL4G?
The 1.5KE91ARL4G has a steady-state power dissipation (PD) rating of 5.0 W at lead temperature (TL) ≤75 °C, derating linearly above that point at 20 mW/°C. This rating applies only to continuous DC or low-frequency conditions-not transient surges-and assumes 3/8-inch lead length. The 1.5KE91ARL4G is not intended for sustained power dissipation; its primary function is pulsed surge suppression.
Does the 1.5KE91ARL4G have UL 497B recognition?
Yes, the 1.5KE91ARL4G carries UL 497B recognition (File #E210057, QVGQ2 category) for isolated loop circuit protection, as confirmed in the official ON Semiconductor datasheet. This certification covers dielectric withstand, endurance conditioning, and strike voltage breakdown testing-validating its use in safety-critical telecom and industrial isolation barriers. The 1.5KE91ARL4G is explicitly included in the UL-recognized 1.5KE6.8A–1.5KE250A family.
1.5KE91ARL4G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-201AD, Axial
- Series:
- Mosorb™
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
1.5KE91ARL4G FAQ
1.How can I place an order for 1.5KE91ARL4G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE91ARL4G 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 1.5KE91ARL4G reliable?
The price and inventory of 1.5KE91ARL4G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE91ARL4G is usually 5 days.
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Once your 1.5KE91ARL4G 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 1.5KE91ARL4G?
For technical support, including 1.5KE91ARL4G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE91ARL4G requirements.
6.How does Aetrix verify that 1.5KE91ARL4G is sourced from the original manufacturer or authorized distributors?
All 1.5KE91ARL4G 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 1.5KE91ARL4G meets industry standards.
7.What is the process for return or replacement of 1.5KE91ARL4G?
All 1.5KE91ARL4G units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE91ARL4G, 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 1.5KE91ARL4G part is unused and in its original packaging.
Return procedure for 1.5KE91ARL4G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE91ARL4G Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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