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onsemi 1.5KE91ARL4
- Part No.:
- 1.5KE91ARL4
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1.5KE91ARL4.pdf
- Description:
- TVS DIODE 77.8VWM 125VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,674
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Product details
Overview
1.5KE91ARL4 from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel clamping protection of sensitive electronics against ESD, lightning surges, and inductive switching transients. It features a 77.8 V working peak reverse voltage (VRWM), 91 V nominal breakdown voltage (VBR), 125 V maximum clamping voltage (VC) at 12 A peak pulse current (IPP), and sub-nanosecond response time - deployed in power supplies, industrial controls, and medical equipment input stages.
For engineers reviewing the 1.5KE91ARL4 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, VRWM alignment with DC bus voltage, surge current capability under 1 ms pulse, and UL 497B recognition for isolated loop circuit compliance.
Technical Context
This device operates as a silicon avalanche diode in reverse-biased breakdown mode, triggered only during overvoltage events exceeding its VBR threshold. Its low dynamic impedance (<1 Ω typical near IPP) ensures stable clamping, while its thermally robust Surmetic axial package (Case 41A) supports 20 °C/W junction-to-lead thermal resistance and 260 °C soldering tolerance.
The 1.5KE91ARL4 complies with Class 3 ESD immunity (>16 kV HBM) and UL 497B for isolated loop protection. Its unidirectional polarity (cathode band marked) mandates correct orientation in DC-coupled circuits, and its 1 ms non-repetitive 1500 W pulse rating requires external series impedance (e.g., fuse or resistor) to limit duty-cycle stress and sustain reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1 ms - sustains single high-energy surges without failure in telecom or industrial power rails |
| Working Peak Reverse Voltage | 77.8 V - sets maximum continuous DC operating voltage before leakage exceeds 5 µA |
| Breakdown Voltage | 91 V (nominal) @ 1 mA test current - defines precise turn-on threshold for transient suppression |
| Clamping Voltage | 125 V @ 12 A IPP - limits voltage seen by downstream ICs during worst-case surge |
| Response Time | <1 ns - enables protection of fast-edge digital interfaces and microcontroller I/O pins |
| ESD Rating | Class 3 (>16 kV HBM) - meets IEC 61000-4-2 Level 4 system-level ESD requirements |
| UL Recognition | UL 497B QVGQ2 - certified for use in isolated communication loops and safety-critical signal paths |
Pinout & Package
1.5KE91ARL4 uses 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″ from case body. Mounting position is unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; forms return path during clamping |
| Cathode | High-side transient sensing terminal | Connected to protected line (e.g., +12 V rail); conducts when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W surge rating | Enables single-device protection of 24–48 V industrial power inputs against 10/1000 µs lightning surges per IEC 61000-4-5 |
| 77.8 V VRWM | Allows direct placement across 72 V DC systems (e.g., PoE++ PSE, battery-backed controllers) with 7.5% headroom |
| 125 V VC @ 12 A | Provides ≥15% margin below 150 V-rated MOSFET gate oxide limits and 140 V-rated DC-DC controller inputs |
| UL 497B certification | Validates suitability for telecom line interface protection without additional isolation components |
| Pb-free axial package | Meets RoHS Directive 2011/65/EU and supports wave/solder reflow assembly with standard profiles |
Applications
| Industrial Power Supply Input Protection | Medical Equipment ESD Shielding |
|---|---|
Use Scenario: 48 V DC input stage of programmable logic controller (PLC) power module exposed to load dump and relay coil flyback. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input rail and chassis ground, activated within <1 ns to limit transient overshoot. Use Value: Clamps 1500 W surges to ≤125 V, preventing damage to upstream rectifier diodes and downstream buck controller ICs rated for 140 V max. | Use Scenario: Front-panel USB and RS-232 ports on diagnostic imaging console subject to operator ESD events. IC Role / Device Role / Timing Role: Board-level TVS on each signal line, referenced to local ground plane, absorbing >16 kV HBM discharges. Use Value: Prevents latch-up and gate oxide rupture in level translators and UART transceivers by limiting voltage excursion to 125 V for <1 ms. |
| Telecom Isolated Loop Interface | Automotive Body Control Module (BCM) Input |
Use Scenario: 24 V analog current loop (4–20 mA) interface in building automation gateway connected to field sensors. IC Role / Device Role / Timing Role: UL 497B-certified TVS across loop terminals to suppress induced surges from nearby AC wiring or lightning coupling. Use Value: Maintains loop integrity during 1 kV/500 A surge tests while meeting safety isolation requirements for Class 2 circuits. | Use Scenario: 12 V switched ignition input to BCM microcontroller GPIO monitoring door lock actuator status. IC Role / Device Role / Timing Role: Primary overvoltage clamp on vehicle battery-supplied input, oriented cathode-to-rail to block reverse polarity faults. Use Value: Survives ISO 7637-2 Pulse 1 (−150 V/50 ms) and Pulse 3a (−100 V/150 ns) without degradation, ensuring functional safety compliance. |
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 | Lower peak power (600 W), SMC package, 90 V VRWM, 129 V VC @ 4.7 A | Better suited for space-constrained PCBs; lower surge capacity limits use to secondary-side or low-energy signal lines | Select SMBJ90A when board area is critical and surge threat level is ≤600 W (e.g., USB data lines) |
| 1.5KE91A | Same electrical specs, but in bulk-packaged axial lead (not tape-and-reel); identical Case 41A mechanicals | No functional difference; differs only in packaging format and reel compatibility for automated assembly | Choose 1.5KE91A for manual prototyping or low-volume hand-soldered builds where tape-and-reel is unnecessary |
Compared with SMBJ90A and 1.5KE91A, the 1.5KE91ARL4 delivers full 1500 W surge handling in Pb-free tape-and-reel format optimized for high-volume SMT-compatible axial insertion, making it the preferred choice for production-grade industrial power input protection where both energy rating and assembly efficiency matter.
Availability
1.5KE91ARL4 is available at Aetrix Electronics and suitable for industrial power supply input protection, medical equipment ESD shielding, and telecom isolated loop interface applications requiring stable component supply, long-term lifecycle support, and UL-certified reliability.
Supply support for 1.5KE91ARL4 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 (now part of onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The 1.5KE91ARL4 belongs to the 1.5KE Series Mosorb TVS family, engineered specifically for high-reliability, high-energy transient suppression in harsh electromagnetic environments - targeting applications where UL recognition, surge robustness, and thermal stability are mandatory.
FAQ
What is the clamping voltage of the 1.5KE91ARL4 and how does it protect downstream components?
The 1.5KE91ARL4 has a maximum clamping voltage (VC) of 125 V at 12 A peak pulse current (IPP). This means that during a transient event, the device limits the voltage across protected circuitry to no more than 125 V - well below the 140–150 V absolute maximum ratings of many power management ICs and MOSFETs. By doing so, the 1.5KE91ARL4 prevents overvoltage stress, gate oxide rupture, and thermal runaway in sensitive downstream components such as DC-DC controllers and microcontrollers.
Is the 1.5KE91ARL4 compatible with lead-free soldering processes?
Yes, the 1.5KE91ARL4 is a Pb-free device in the Surmetic axial package (Case 41A) and is qualified for lead-free soldering. Its leads withstand 260 °C for 10 seconds at 1/16 inch from the case body, fully compliant with J-STD-020 moisture sensitivity and IPC/JEDEC reflow standards. The 1.5KE91ARL4 may be processed using standard wave or selective soldering profiles without risk of package cracking or solder joint voiding.
Does the 1.5KE91ARL4 meet UL 497B certification, and what does that mean for my design?
Yes, the 1.5KE91ARL4 is UL 497B recognized (File #E210057, Category QVGQ2) for protector applications in isolated loop circuits. This certification validates performance under strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge testing - confirming suitability for safety-critical telecom, building automation, and industrial control interfaces without requiring additional isolation components or third-party safety review.
How does the 1.5KE91ARL4 differ from the 1.5KE91A variant?
The 1.5KE91ARL4 and 1.5KE91A share identical electrical specifications, thermal characteristics, and mechanical dimensions (Case 41A). The sole difference is packaging: the "RL4" suffix denotes tape-and-reel delivery (1500 units per reel), optimized for automated axial insertion equipment, whereas the "A" suffix indicates bulk box packaging (500 units per box) intended for manual assembly or low-volume prototyping. Both are Pb-free and UL-recognized.
Can the 1.5KE91ARL4 be used in bidirectional protection configurations?
No - the 1.5KE91ARL4 is strictly unidirectional and must be installed with correct polarity (cathode to the protected line, anode to ground). For bidirectional surge protection (e.g., AC lines or differential data buses), a dedicated bidirectional TVS like the 1.5KE91CA or SMAJ90CA is required. Using two 1.5KE91ARL4 devices in anti-parallel is not recommended due to mismatched VBR tolerances and undefined clamping behavior during negative transients.
1.5KE91ARL4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-201AD, Axial
- Series:
- Mosorb™
- 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:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
1.5KE91ARL4 FAQ
1.How can I place an order for 1.5KE91ARL4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE91ARL4 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 1.5KE91ARL4 reliable?
The price and inventory of 1.5KE91ARL4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE91ARL4 is usually 5 days.
3.What payment methods are accepted for 1.5KE91ARL4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE91ARL4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE91ARL4?
1.5KE91ARL4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE91ARL4 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 1.5KE91ARL4?
For technical support, including 1.5KE91ARL4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE91ARL4 requirements.
6.How does Aetrix verify that 1.5KE91ARL4 is sourced from the original manufacturer or authorized distributors?
All 1.5KE91ARL4 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 1.5KE91ARL4 meets industry standards.
7.What is the process for return or replacement of 1.5KE91ARL4?
All 1.5KE91ARL4 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE91ARL4, 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 1.5KE91ARL4 part is unused and in its original packaging.
Return procedure for 1.5KE91ARL4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE91ARL4 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
-
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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