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ISL8842AMBZ Equivalent & Substitute Parts
Part Overview
The ISL8842AMBZ is an offline switch controller manufactured by Renesas Electronics Corporation, designed for boost and flyback converter topologies operating up to 2MHz. This active product is widely used in power management applications requiring non-isolated offline switching control with current limiting fault protection. The part is RoHS3 compliant and currently in stock with 608 units available.
Equivalent and substitute parts are identified based on matching electrical characteristics, package compatibility, and functional topology support. Substitutes enable design flexibility, supply chain alternatives, and performance optimization within the same application class.
Substiute Parts
Key Parameters
| Parameter | ISL8842AMBZ |
|---|---|
| Manufacturer | Renesas Electronics Corporation |
| Category | Power Management (PMIC) |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Topology | Boost, Flyback |
| Voltage - Supply (Vcc/Vdd) | 8.8V ~ 30V |
| Frequency - Switching | Up to 2MHz |
| Duty Cycle | 96% |
| Fault Protection | Current Limiting |
| Control Features | Frequency Control |
| Operating Temperature | -55°C ~ 125°C (TA) |
| Output Isolation | Non-Isolated |
| RoHS Status | RoHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) |
| Product Status | Active |
Substitute Part Grouping Explanation
Substitute parts for the ISL8842AMBZ are qualified based on the following critical parameters:
Package Compatibility: All substitutes must use 8-SOIC (0.154", 3.90mm Width) surface mount packaging to ensure PCB layout compatibility without redesign.
Topology Support: Substitutes must support boost and/or flyback converter topologies, as these define the primary application class.
Voltage Supply Range: The supply voltage range (8.8V ~ 30V for ISL8842AMBZ) establishes the operating envelope. Substitutes with overlapping or wider ranges are compatible.
Duty Cycle: Maximum duty cycle of 96% is a critical design parameter. Substitutes must meet or exceed this specification.
Switching Frequency: Operating frequency up to 2MHz defines the switching performance class. Substitutes with equal or higher frequency capability are acceptable.
Fault Protection & Control Features: Current limiting and frequency control are functional requirements that substitutes must provide.
Temperature Range: Operating temperature -55°C ~ 125°C establishes the thermal operating class. Substitutes with equal or wider ranges are acceptable.
Compliance & Status: All substitutes must be active products with RoHS3 compliance to meet regulatory requirements.
Parameter Comparison
| Parameter | ISL8842AMBZ | MIC38C43AYM | MIC38HC42YM | MIC38HC42YM-TR | MIC38HC43YM | MIC38HC43YM-TR | UC1842AMDREP | UC1843AMDREP | UC1844AMDREP | UC1845AMDREP |
|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Renesas | Microchip | Microchip | Microchip | Microchip | Microchip | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package / Case | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Topology | Boost, Flyback | Buck, Boost, Flyback, Forward | Boost, Buck, Flyback, Forward | Boost, Buck, Flyback, Forward | Buck, Boost, Flyback, Forward | Buck, Boost, Flyback, Forward | Boost, Flyback | Boost, Flyback | Boost, Flyback | Boost, Flyback |
| Voltage - Supply (Vcc/Vdd) | 8.8V ~ 30V | 7.6V ~ 20V | 9V ~ 20V | 9V ~ 20V | 7.6V ~ 20V | 7.6V ~ 20V | 10V ~ 30V | 7.9V ~ 30V | 10V ~ 30V | 7.9V ~ 30V |
| Duty Cycle (Max) | 96% | 96% | 96% | 96% | 96% | 96% | — | — | — | — |
| Frequency - Switching | Up to 2MHz | 500kHz | 500kHz | 500kHz | — | — | — | — | — | — |
| Operating Temperature | -55°C ~ 125°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 150°C (TJ) | -40°C ~ 150°C (TJ) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -55°C ~ 125°C (TA) | -55°C ~ 125°C (TA) | -55°C ~ 125°C (TA) | -55°C ~ 125°C (TA) |
| RoHS Status | RoHS3 Compliant | RoHS3 Compliant | RoHS3 Compliant | RoHS3 Compliant | RoHS3 Compliant | RoHS3 Compliant | RoHS3 Compliant | RoHS3 Compliant | RoHS3 Compliant | RoHS3 Compliant |
| Product Status | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
Microchip MIC38HC42YM / MIC38HC42YM-TR Series: These parts support boost, buck, flyback, and forward topologies with isolated output capability. The MIC38HC42YM-TR variant offers tape & reel packaging with 3432 units in stock. Operating temperature extends to 150°C (TJ), exceeding ISL8842AMBZ specifications. Supply voltage range 9V ~ 20V is narrower than the main part but covers standard offline applications. Switching frequency is 500kHz, lower than ISL8842AMBZ's 2MHz capability.
Microchip MIC38HC43YM / MIC38HC43YM-TR Series: These controllers support buck, boost, flyback, and forward topologies with positive, isolation-capable output configuration. The MIC38HC43YM variant has 35400 units in stock. Supply voltage range 7.6V ~ 20V overlaps with ISL8842AMBZ. Operating temperature -40°C ~ 85°C is narrower than the main part. Switching frequency is not specified in available data.
Microchip MIC38C43AYM: This part supports multiple topologies (buck, boost, flyback, forward) with step-up/step-down capability. Supply voltage 7.6V ~ 20V and duty cycle 96% match key parameters. Operating temperature -40°C ~ 85°C is narrower than ISL8842AMBZ. Switching frequency 500kHz is lower than the main part's 2MHz.
Texas Instruments UC1842AMDREP / UC1843AMDREP / UC1844AMDREP / UC1845AMDREP Series: These PWM controllers support boost and flyback topologies. UC1842AMDREP and UC1844AMDREP specify 10V ~ 30V supply voltage; UC1843AMDREP and UC1845AMDREP specify 7.9V ~ 30V, matching or exceeding ISL8842AMBZ's 8.8V ~ 30V range. All operate at -55°C ~ 125°C, matching the main part's temperature range. Current supply is 11 mA. Switching frequency and duty cycle specifications are not provided in available data.
All substitute parts are active products with RoHS3 compliance and REACH unaffected status, meeting regulatory requirements equivalent to ISL8842AMBZ.
Frequently Asked Questions (FAQ)
Q: Can I directly replace ISL8842AMBZ with any of these substitutes without PCB modification?
A: Yes, all listed substitutes use 8-SOIC (0.154", 3.90mm Width) surface mount packaging, ensuring pin-compatible footprints. However, verify pinout assignments and control signal requirements in device datasheets before implementation, as functional pin definitions may differ between manufacturers.
Q: Which substitute has the closest operating temperature range to ISL8842AMBZ?
A: The Texas Instruments UC1842AMDREP, UC1843AMDREP, UC1844AMDREP, and UC1845AMDREP series all operate at -55°C ~ 125°C (TA), exactly matching ISL8842AMBZ. The Microchip MIC38HC42YM and MIC38HC42YM-TR extend to 150°C (TJ), providing wider thermal capability.
Q: What is the key difference between Microchip MIC38HC42YM and MIC38HC43YM?
A: MIC38HC42YM is an offline switch with internal switch capability and isolated output. MIC38HC43YM is a regulator controller with transistor driver output and isolation-capable configuration. Both support multiple topologies and 96% duty cycle, but differ in output type and internal architecture.
Q: Are there supply voltage compatibility concerns when substituting?
A: ISL8842AMBZ operates at 8.8V ~ 30V. Most Microchip substitutes specify 7.6V ~ 20V or 9V ~ 20V, which is narrower. Texas Instruments UC1843AMDREP and UC1845AMDREP specify 7.9V ~ 30V, providing better overlap. Verify your application's supply voltage falls within the substitute's specified range.
Q: Which substitute offers the highest switching frequency capability?
A: ISL8842AMBZ operates up to 2MHz. Microchip MIC38HC42YM, MIC38HC42YM-TR, and MIC38C43AYM specify 500kHz. Texas Instruments UC series do not provide switching frequency specifications in available data. For high-frequency applications, ISL8842AMBZ remains the specified choice.
Q: What packaging options are available for substitutes?
A: Microchip MIC38HC42YM is available in Tube packaging; MIC38HC42YM-TR is Tape & Reel (TR). Microchip MIC38HC43YM is Tube; MIC38HC43YM-TR is Cut Tape (CT) & Digi-Reel®. Texas Instruments UC series are Cut Tape (CT) & Digi-Reel® packaging. All maintain 8-SOIC form factor compatibility.
Q: Do all substitutes support both boost and flyback topologies?
A: ISL8842AMBZ supports boost and flyback. All listed Microchip substitutes support boost, flyback, and additional topologies (buck, forward). Texas Instruments UC series support boost and flyback. All substitutes meet or exceed the topology requirements of ISL8842AMBZ.
Q: Which substitute has the largest current inventory?
A: Microchip MIC38HC43YM has 35400 units in stock, the highest availability among all substitutes. MIC38HC42YM-TR has 3432 units. ISL8842AMBZ has 608 units available.
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