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onsemi 1.5KE9.1A
- Part No.:
- 1.5KE9.1A
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1.5KE9.1A.pdf
- Description:
- TVS DIODE 7.78VWM 13.4VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:5,577
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Product details
Overview
1.5KE9.1A 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 7.78 V working peak reverse voltage (VRWM), 9.1 V nominal breakdown voltage (VBR) at 1 mA test current, and clamps to 13.4 V at 112 A peak pulse current (IPP), making it suitable for DC power rail protection in industrial power supplies and communication interfaces.
For engineers reviewing the 1.5KE9.1A datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin over operating voltage, clamping voltage vs. IC absolute maximum ratings, surge current capability under 1 ms pulses, and UL 497B recognition for isolated loop circuit compliance.
Technical Context
The 1.5KE9.1A operates as a Zener-based avalanche clamp with fast <1 ns response time and low dynamic impedance. Its unidirectional polarity requires cathode connection to the protected line and anode to ground, enabling precise overvoltage limiting without forward conduction during normal operation.
It is rated for 1500 W nonrepetitive peak pulse power per 1 ms waveform (Figure 5), with thermal resistance of 20 °C/W junction-to-lead and steady-state power dissipation derated from 5.0 W at 75 °C lead temperature. The device meets Class 3 ESD immunity (>16 kV HBM) and UL 497B certification for isolated loop protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 7.78 V - Maximum continuous reverse voltage before clamping begins; must exceed system DC operating voltage. |
| VBR @ IT = 1 mA | 9.1 V (nominal), 8.65–9.55 V range - Avalanche breakdown threshold defining turn-on precision. |
| VC @ IPP = 112 A | 13.4 V - Clamped voltage during full-rated surge; determines maximum stress on downstream ICs. |
| IPP | 112 A - Peak pulse current capability under 1 ms 8.3 ms half-sine waveform; defines surge energy handling. |
| IR @ VRWM | 50 µA max - Reverse leakage at working voltage; ensures minimal standby power loss and signal integrity. |
| Response Time | <1 ns - Enables suppression before transient energy couples into protected circuitry. |
| UL Recognition | UL 497B QVGQ2 - Certified for use in isolated loop telecom and industrial interface protection. |
Pinout & Package
Package: Axial lead, Surmetic plastic case (Case 41A), Pb-free, cathode indicated by band. Dimensions: A = 8.5–9.5 mm length, B = 4.8–5.3 mm diameter, D = 0.96–1.06 mm lead diameter.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground plane; establishes clamping reference and carries full surge return current. |
| Cathode | Protected line terminal | Connected to line being protected (e.g., +12 V rail); avalanche conduction occurs when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Handles high-energy transients (e.g., IEC 61000-4-5 Level 4 surges) without failure. |
| UL 497B certification | Validated for safety-critical isolated loop protection in telecom and process control systems. |
| ESD rating >16 kV HBM | Provides robust handling during board assembly and field service without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.47) | Minimizes overvoltage margin required between protected IC's absolute max rating and VBR. |
| Thermal resistance 20 °C/W | Enables reliable heat dissipation through leads into PCB copper, supporting repeated surge events. |
Applications
| Industrial Power Supply Protection | RS-485/422 Interface Protection |
|---|---|
Use Scenario: Protecting +5 V, +12 V, or +24 V DC rails in programmable logic controllers (PLCs) and motor drives against load dump and inductive kickback. IC Role / Device Role: Unidirectional TVS clamp placed between rail and ground to limit transient overvoltage. Use Value: Prevents latch-up or permanent damage to microcontrollers and gate drivers by clamping to 13.4 V while absorbing 112 A surges. | Use Scenario: Safeguarding differential data lines in factory automation networks exposed to ground potential differences and EFT bursts. IC Role / Device Role: Line-to-ground TVS on each RS-485 bus line (A and B) referenced to local ground. Use Value: Maintains signal integrity under IEC 61000-4-4 EFT (4 kV) and IEC 61000-4-5 surge (2 kV) while meeting UL 497B isolation requirements. |
| Medical Equipment Input Protection | AC-DC Adapter Secondary-Side Clamp |
Use Scenario: Shielding patient-connected monitoring equipment inputs from electrostatic discharge and defibrillator-induced transients. IC Role / Device Role: Primary overvoltage clamp on analog front-end supply rails prior to ADC and op-amp stages. Use Value: Ensures compliance with IEC 60601-1-2 immunity requirements via sub-1 ns response and certified UL 497B isolation barrier support. | Use Scenario: Clamping secondary-side DC output of wall adapters against surge coupling from primary-side transients or lightning-induced common-mode noise. IC Role / Device Role: Output rail TVS connected between +VOUT and GND to limit post-regulator overvoltage. Use Value: Limits worst-case output overshoot to 13.4 V during 1 ms surges, protecting downstream USB peripherals and charging ICs. |
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 | Lower peak power (600 W), smaller SMB package, 9.0 V VBR, 14.4 V VC @ 41.7 A | Targeted for space-constrained PCBs; insufficient for 1500 W surge requirements | Select only if surge energy is ≤600 W and layout area is critical; verify clamping margin with downstream IC ratings. |
| 1.5KE9.1CA | Bi-directional variant; same VRWM, VBR, VC, and power rating but symmetric clamping for AC lines | Required for AC-coupled signals or bidirectional data lines where reverse polarity transients occur | Choose 1.5KE9.1CA only when protecting balanced or AC-signaled paths; 1.5KE9.1A is optimal for DC rail clamping. |
Compared with SMBJ9.0A and 1.5KE9.1CA, the 1.5KE9.1A provides higher surge energy handling in axial-leaded form factor and unidirectional clamping optimized for DC power rails-making it preferred for industrial power supply and interface protection where 1500 W pulse capability and UL 497B certification are mandatory.
Availability
1.5KE9.1A is available at Aetrix Electronics and suitable for industrial power supply protection, RS-485 interface hardening, medical equipment input safeguarding, and AC-DC adapter secondary-side clamping requiring stable component supply across long production lifecycles.
Supply support for 1.5KE9.1A 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, sensor, and discrete devices for automotive, industrial, and communications markets.
The 1.5KE9.1A belongs to the 1.5KE Series Mosorb TVS family, engineered for high-reliability transient suppression in harsh environments-designed specifically to meet UL 497B, IEC 61000-4-2/4/5, and AEC-Q200 requirements for industrial and medical systems.
FAQ
What is the working peak reverse voltage (VRWM) of the 1.5KE9.1A?
The 1.5KE9.1A has a working peak reverse voltage (VRWM) of 7.78 V, meaning it remains in high-impedance blocking mode up to this DC or continuous peak voltage. This value ensures compatibility with 5 V or 9 V systems where a safety margin above nominal rail voltage is required before clamping initiates. Exceeding VRWM triggers avalanche conduction, so proper selection requires VRWM ≥ maximum steady-state line voltage.
How does the 1.5KE9.1A differ from the bi-directional 1.5KE9.1CA?
The 1.5KE9.1A is unidirectional and clamps only in reverse bias, with anode grounded and cathode on the protected line. In contrast, the 1.5KE9.1CA provides symmetrical clamping for both polarities, making it suitable for AC signals or bidirectional data lines. Both share identical VRWM, VBR, VC, and 1500 W rating, but the 1.5KE9.1A is optimized for DC rail protection where reverse conduction is not needed.
Is the 1.5KE9.1A UL 497B certified?
Yes, the 1.5KE9.1A is UL 497B recognized under file #E210057 for protector classification (QVGQ2). This certification validates its suitability for isolated loop circuit protection in telecommunications and industrial control systems, covering tests including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance-exceeding basic flammability-only recognition offered by many competitors.
What is the maximum clamping voltage (VC) of the 1.5KE9.1A under surge conditions?
The 1.5KE9.1A clamps to a maximum of 13.4 V when subjected to its rated 112 A peak pulse current (IPP), measured using the standard 1 ms exponential waveform per Figure 5. This VC value defines the upper voltage limit imposed on protected circuitry during surge events and must be compared directly against the absolute maximum ratings of downstream ICs to ensure safe operation.
Can the 1.5KE9.1A be used in surface-mount designs?
No, the 1.5KE9.1A is an axial-leaded through-hole device in Case 41A package and is not compatible with surface-mount assembly. For SMT alternatives, consider the SMBJ9.0A (600 W) or SMCJ9.0A (1500 W) families-but note these differ in package, thermal path, and mechanical mounting. The 1.5KE9.1A requires lead-forming and wave or hand soldering with maximum 260 °C for 10 seconds at 1/16 inch from case.
1.5KE9.1A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-201AD, Axial
- Series:
- Mosorb™
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
1.5KE9.1A FAQ
1.How can I place an order for 1.5KE9.1A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE9.1A 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 1.5KE9.1A reliable?
The price and inventory of 1.5KE9.1A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE9.1A is usually 5 days.
3.What payment methods are accepted for 1.5KE9.1A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE9.1A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE9.1A?
1.5KE9.1A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE9.1A 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 1.5KE9.1A?
For technical support, including 1.5KE9.1A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE9.1A requirements.
6.How does Aetrix verify that 1.5KE9.1A is sourced from the original manufacturer or authorized distributors?
All 1.5KE9.1A 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 1.5KE9.1A meets industry standards.
7.What is the process for return or replacement of 1.5KE9.1A?
All 1.5KE9.1A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE9.1A, 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 1.5KE9.1A part is unused and in its original packaging.
Return procedure for 1.5KE9.1A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE9.1A 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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