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onsemi 1.5KE43CARL4
- Part No.:
- 1.5KE43CARL4
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
1.5KE43CARL4.pdf
- Description:
- TRANS VOLTAGE SUPPRESSOR DIODE
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
1.5KE43CARL4 from ON Semiconductor is a bidirectional 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 36.8 V working peak reverse voltage (VRWM), 43 V nominal breakdown voltage (VBR), 59.3 V maximum clamping voltage (VC) at 25.3 A peak pulse current (IPP), and sub-1 ns response time - deployed in power supplies, industrial controls, and medical equipment input stages.
For engineers reviewing the 1.5KE43CARL4 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system DC bus voltage, VC margin relative to IC absolute maximum ratings, UL 497B certification for isolated loop protection, and axial lead (Case 41A) thermal derating above 75°C.
Technical Context
This device operates as a voltage-clamping Zener-based TVS in bidirectional configuration, enabling symmetric surge suppression on AC lines or ungrounded differential signals. Its low zener impedance and fast avalanche turn-on (<1 ns) ensure minimal overshoot during transient events up to 1500 W (1 ms pulse), with thermal resistance of 20°C/W junction-to-lead supporting sustained operation under pulsed stress.
Designed for axial-leaded through-hole mounting, it uses Surmetic plastic encapsulation with void-free molding and corrosion-resistant leads rated for 230°C soldering (10 s at 1/16″ from case). Polarity is non-directional - the cathode band does not indicate polarity - simplifying layout in AC-coupled or floating applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1 ms - withstands high-energy lightning-induced surges per IEC 61000-4-5 Level 4 without failure |
| Working Peak Reverse Voltage | 36.8 V - sets minimum operating voltage threshold; must exceed circuit's continuous DC or peak AC voltage |
| Clamping Voltage | 59.3 V @ 25.3 A IPP - defines maximum voltage seen by protected IC during worst-case transient |
| Breakdown Voltage | 43 V (nominal) @ 1 mA IT - precise Zener conduction onset ensures predictable clamping activation |
| Leakage Current | <5 μA @ 36.8 V - negligible standby power loss and no signal integrity impact in high-impedance circuits |
| Response Time | <1 ns - limits voltage overshoot before clamping engages, critical for protecting fast CMOS/MOS inputs |
| ESD Rating | Class 3 (>16 kV HBM) - exceeds IEC 61000-4-2 requirements for system-level ESD immunity |
Pinout & Package
1.5KE43CARL4 is housed in an axial-leaded Surmetic plastic package (Case 41A), with two electrically identical terminals. The device is bidirectional: both leads are functionally interchangeable, and the cathode band serves only as a mechanical orientation marker - not polarity indication.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (marked) | Bidirectional Zener junction terminal | No functional polarity - either lead may connect to line or return; cathode band is non-functional marking |
| Unmarked Lead | Bidirectional Zener junction terminal | Electrically identical to marked lead; enables flexible PCB layout without orientation constraints |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Qualified for isolated loop circuit protection - meets rigorous strike voltage, endurance, and dielectric withstand tests required for telecom and industrial safety compliance |
| Low Clamping Ratio | VC/VBR = 59.3/43 ≈ 1.38 - tight voltage control minimizes overvoltage stress on downstream ICs during surge events |
| Thermal Robustness | RJL = 20°C/W - enables reliable heat dissipation into PCB copper or chassis when mounted with 3/8″ lead length |
| High Surge Current Capacity | IPP = 25.3 A - supports repeated exposure to 10/1000 μs transients in harsh industrial environments |
| Corrosion-Resistant Leads | Readily solderable finish - ensures long-term reliability in humid or chemically aggressive operating conditions |
Applications
| AC Power Input Protection | Industrial PLC Analog I/O |
|---|---|
Use Scenario: Protecting AC-DC converter front-end against lightning-induced surges on 24–48 VAC control lines. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across line-to-line or line-to-ground, absorbing energy before rectifier or controller ICs. Use Value: 59.3 V clamping ensures MOSFET gate drivers and bridge rectifiers remain below their 60–65 V absolute max ratings during 1 kV/0.5 kA surges. | Use Scenario: Safeguarding 4–20 mA current loop inputs in programmable logic controllers exposed to field wiring transients. IC Role / Device Role / Timing Role: Parallel-connected TVS on analog input terminals, referenced to isolated ground to prevent latch-up in precision ADCs and op-amps. Use Value: UL 497B recognition validates suitability for safety-critical isolated loop protection, while <1 ns response prevents transient-induced data corruption. |
| Medical Equipment Power Rails | Telecom Line Interface |
Use Scenario: Shielding internal 24 V DC power distribution rails in diagnostic imaging systems from ESD and load dump events. IC Role / Device Role / Timing Role: Localized clamping device placed near power entry points and sensitive subsystems (e.g., FPGA power domains). Use Value: 36.8 V VRWM aligns precisely with 24 V nominal rail + 50% tolerance, avoiding false triggering while maintaining robust 25.3 A surge capacity. | Use Scenario: Protecting RS-485 transceiver terminals in base station backhaul links subjected to induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Differential-mode TVS across A/B bus lines, leveraging bidirectional symmetry to handle polarity-reversing transients. Use Value: Symmetric clamping (±59.3 V) preserves common-mode range integrity and prevents receiver saturation during asymmetric surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43CA | Surface-mount SMB package; lower 600 W peak power; same 43 V VBR and ~60 V VC | Requires PCB redesign for SMT placement; unsuitable for high-current through-hole legacy designs | Select when board space is constrained and surge duty is moderate (IEC 61000-4-5 Level 2) |
| 1.5KE43A | Unidirectional variant; same package and power rating but clamps only in reverse direction | Requires external series diode for AC line protection; not suitable for floating or bidirectional signal paths | Select only for DC-biased circuits where forward conduction must be blocked |
Compared with SMBJ43CA and 1.5KE43A, the 1.5KE43CARL4 provides higher surge robustness (1500 W vs. 600 W) and true bidirectional clamping without polarity constraints - making it optimal for AC mains interfaces, isolated analog channels, and legacy through-hole industrial designs requiring UL 497B validation.
Availability
1.5KE43CARL4 is available at Aetrix Electronics and suitable for industrial automation, medical power systems, and telecom infrastructure requiring stable component supply with full traceability and lifecycle continuity.
Supply support for 1.5KE43CARL4 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 cloud power applications.
The 1.5KExxCA series was engineered specifically for high-reliability transient suppression in harsh environments - emphasizing UL-certified isolation, axial-leaded thermal performance, and consistent clamping across wide temperature ranges.
FAQ
What is the clamping voltage of the 1.5KE43CARL4 under maximum surge conditions?
The 1.5KE43CARL4 has a maximum clamping voltage (VC) of 59.3 V at its rated peak pulse current (IPP) of 25.3 A, measured using the standard 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within their absolute maximum ratings. The 1.5KE43CARL4 maintains this clamping performance due to its low dynamic impedance and thermally stable Zener structure.
Is the 1.5KE43CARL4 suitable for AC line protection?
Yes, the 1.5KE43CARL4 is explicitly designed for AC line protection due to its bidirectional architecture - it clamps symmetrically in both polarities without requiring external diodes. With a 36.8 V working peak reverse voltage (VRWM), it safely operates on 24–32 VAC RMS lines (e.g., 24 VAC control circuits), and its UL 497B recognition validates use in isolated loop protection per safety standards. The 1.5KE43CARL4's axial lead package also supports robust mechanical mounting in panel-mounted power supplies and industrial enclosures.
Does the cathode band on the 1.5KE43CARL4 indicate polarity?
No, the cathode band on the 1.5KE43CARL4 is a non-functional mechanical orientation marker and does not indicate electrical polarity. As a bidirectional TVS, the device exhibits identical Zener characteristics in both directions - both leads are electrically interchangeable. This design eliminates orientation errors during manual assembly and simplifies routing in AC-coupled or floating signal paths. The 1.5KE43CARL4's datasheet explicitly states "Polarity: Cathode band does not imply polarity," confirming its true bidirectional behavior.
How does the 1.5KE43CARL4 compare to the 1.5KE43CA in terms of packaging and reel format?
The 1.5KE43CARL4 differs from the base 1.5KE43CA solely in packaging format: "RL4" denotes tape-and-reel packaging (1500 units per reel), while standard 1.5KE43CA is supplied in 500-unit boxes. Electrically and thermally, the 1.5KE43CARL4 is identical - same Case 41A axial package, identical VRWM (36.8 V), VBR (43 V), VC (59.3 V), and surge ratings. The 1.5KE43CARL4 is optimized for automated SMT-compatible pick-and-place despite being a through-hole device, supporting high-volume manufacturing without compromising performance.
What thermal derating applies to the 1.5KE43CARL4 at elevated ambient temperatures?
The 1.5KE43CARL4's steady-state power dissipation (PD) is rated at 5.0 W at TL ≤ 75°C with 3/8″ lead length, derating linearly at 20 mW/°C above that temperature. Its junction-to-lead thermal resistance (RJL) is 20°C/W, meaning a 1 W power dissipation raises the junction temperature 20°C above lead temperature. For pulsed operation, peak power remains 1500 W at TA = 25°C but must be reduced per Figure 1's derating curve - e.g., to ~1100 W at TA = 70°C. These thermal limits directly impact reliability in enclosed industrial enclosures, and the 1.5KE43CARL4's datasheet provides explicit curves for both steady-state and transient derating.
1.5KE43CARL4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- -
- Unidirectional Channels:
- -
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- -
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- -
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
1.5KE43CARL4 FAQ
1.How can I place an order for 1.5KE43CARL4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE43CARL4 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 1.5KE43CARL4 reliable?
The price and inventory of 1.5KE43CARL4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE43CARL4 is usually 5 days.
3.What payment methods are accepted for 1.5KE43CARL4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE43CARL4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE43CARL4?
1.5KE43CARL4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE43CARL4 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 1.5KE43CARL4?
For technical support, including 1.5KE43CARL4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE43CARL4 requirements.
6.How does Aetrix verify that 1.5KE43CARL4 is sourced from the original manufacturer or authorized distributors?
All 1.5KE43CARL4 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 1.5KE43CARL4 meets industry standards.
7.What is the process for return or replacement of 1.5KE43CARL4?
All 1.5KE43CARL4 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE43CARL4, 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 1.5KE43CARL4 part is unused and in its original packaging.
Return procedure for 1.5KE43CARL4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE43CARL4 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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