ISL8841AMBZ Equivalent & Substitute Parts

Part Overview

The ISL8841AMBZ is a Boost/Flyback Regulator Controller manufactured by Renesas Electronics Corporation, designed for step-up and step-up/step-down DC-DC conversion applications with isolation capability. This 8-SOIC surface mount IC operates across a 9V to 30V supply range with switching frequencies up to 2MHz and a maximum duty cycle of 48%. The part is currently active in production with 1031 units in stock and carries full RoHS3 compliance.

Substitute parts are necessary when the ISL8841AMBZ becomes unavailable, when alternative packaging formats are required, or when design flexibility demands controller options with comparable electrical and mechanical specifications within the same topology class.

Key Parameters

Parameter	ISL8841AMBZ
Manufacturer	Renesas Electronics Corporation
Category	Power Management (PMIC)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Topology	Boost, Flyback
Function	Step-Up, Step-Up/Step-Down
Output Configuration	Positive, Isolation Capable
Voltage - Supply (Vcc/Vdd)	9V ~ 30V
Frequency - Switching	Up to 2MHz
Duty Cycle (Max)	48%
Operating Temperature	-55°C ~ 125°C (TJ)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the ISL8841AMBZ is determined by the following critical parameters:

Primary Substitution Criteria:

Package / Case: 8-SOIC (0.154", 3.90mm Width) — mechanical and electrical compatibility
Topology: Boost, Flyback — functional equivalence for converter design
Function: Step-Up, Step-Up/Step-Down — output voltage conversion capability
Output Configuration: Positive, Isolation Capable — isolation and polarity requirements
Voltage - Supply Range: Minimum 9V to 30V overlap — operating envelope compatibility
Mounting Type: Surface Mount — assembly process compatibility

Substitute parts are grouped into two categories based on supply voltage compatibility:

Category A (Full Voltage Range Compatibility: 9V ~ 30V or 10V ~ 30V): UC1842AMDREP, UC1844AMDREP, UC2842ADM, UC2844AD8, UC2844AD8TR, UC3842AD8, UC3842AD8TR

Category B (Lower Voltage Range: 7.6V ~ 30V or 7.9V ~ 30V): UC1843AMDREP, UC1845AMDREP, UC2845ADM

All substitute parts maintain 8-SOIC packaging, surface mount configuration, RoHS3 compliance, and MSL Level 1 rating.

Parameter Comparison

Part Number	Manufacturer	Package / Case	Topology	Function	Voltage - Supply	Frequency - Switching	Duty Cycle (Max)	Operating Temperature	Product Status
ISL8841AMBZ	Renesas	8-SOIC	Boost, Flyback	Step-Up, Step-Up/Step-Down	9V ~ 30V	Up to 2MHz	48%	-55°C ~ 125°C (TJ)	Active
UC1842AMDREP	Texas Instruments	8-SOIC	Boost, Flyback	Step-Up, Step-Up/Step-Down	10V ~ 30V	—	—	-55°C ~ 125°C (TA)	Active
UC1843AMDREP	Texas Instruments	8-SOIC	Boost, Flyback	Step-Up, Step-Up/Step-Down	7.9V ~ 30V	—	—	-55°C ~ 125°C (TA)	Active
UC1844AMDREP	Texas Instruments	8-SOIC	Boost, Flyback	Step-Up, Step-Up/Step-Down	10V ~ 30V	—	—	-55°C ~ 125°C (TA)	Active
UC1845AMDREP	Texas Instruments	8-SOIC	Boost, Flyback	Step-Up, Step-Up/Step-Down	7.9V ~ 30V	—	—	-55°C ~ 125°C (TA)	Active
UC2842ADM	Microchip Technology	8-SOIC	Boost, Buck, Flyback, Forward	Step-Up, Step-Down	10V ~ 30V	Up to 500kHz	96%	-40°C ~ 85°C (TA)	Discontinued at DiGi Electronics
UC2844AD8	Texas Instruments	8-SOIC	Boost, Buck, Flyback, Forward	Step-Up, Step-Down	10V ~ 30V	—	—	-40°C ~ 85°C (TA)	Last Time Buy
UC2844AD8TR	Texas Instruments	8-SOIC	Boost, Buck, Flyback, Forward	Step-Up, Step-Down	10V ~ 30V	—	—	-40°C ~ 85°C (TA)	Active
UC2845ADM	Microchip Technology	8-SOIC	Boost, Buck, Flyback, Forward	Step-Up, Step-Down	7.6V ~ 30V	Up to 500kHz	48%	-40°C ~ 85°C (TA)	Obsolete
UC3842AD8	Texas Instruments	8-SOIC	Boost, Buck, Flyback, Forward	Step-Up, Step-Down	10V ~ 30V	—	—	0°C ~ 70°C (TA)	Last Time Buy
UC3842AD8TR	Texas Instruments	8-SOIC	Boost, Buck, Flyback, Forward	Step-Up, Step-Down	10V ~ 30V	—	—	0°C ~ 70°C (TA)	Active

Engineering Selection Recommendations

Recommended Primary Substitutes (Active Status):

UC1842AMDREP and UC1844AMDREP from Texas Instruments are the preferred substitutes. Both maintain active product status, 8-SOIC packaging, RoHS3 compliance, and MSL Level 1 rating. These parts support the 10V ~ 30V supply range, which overlaps the ISL8841AMBZ operating envelope above 10V. Texas Instruments' UCx84xA series provides established supply chain availability with 2744 and 1301 units respectively in current inventory.

UC2844AD8TR represents an alternative with active status and the highest inventory availability (59202 units). This part operates within the 10V ~ 30V range and maintains full RoHS3 and MSL Level 1 compliance.

Secondary Substitutes (Limited Availability):

UC2842ADM (Microchip Technology) is discontinued at DiGi Electronics but remains available with 2977 units in stock. This part extends topology support to include Buck and Forward configurations while maintaining 10V ~ 30V supply compatibility and 48% maximum duty cycle alignment with the ISL8841AMBZ.

UC2845ADM (Microchip Technology) is obsolete but available with 4908 units in inventory. This part supports the lower 7.6V ~ 30V supply range and maintains 48% maximum duty cycle specification.

Not Recommended:

UC3842AD8 and UC3842AD8TR carry "Last Time Buy" or reduced operating temperature specifications (0°C ~ 70°C), limiting their suitability for applications requiring the ISL8841AMBZ's extended -55°C ~ 125°C temperature range.

UC2844AD8 is designated "Last Time Buy" status and should be avoided for new designs.

Frequently Asked Questions (FAQ)

Q: Can UC1842AMDREP directly replace ISL8841AMBZ in all applications?

A: UC1842AMDREP is mechanically and functionally compatible within the 10V ~ 30V supply overlap. Applications operating below 10V require verification of circuit behavior at the lower supply threshold. Both parts maintain identical 8-SOIC packaging, RoHS3 compliance, and MSL Level 1 rating.

Q: What is the difference between UC1842AMDREP and UC1844AMDREP?

A: Both parts are Texas Instruments PWM controllers in 8-SOIC packaging with 10V ~ 30V supply range and active product status. UC1842AMDREP is supplied in Tape & Reel format with 2744 units in stock. UC1844AMDREP is supplied in Cut Tape & Digi-Reel format with 1301 units in stock. Selection depends on packaging and quantity requirements.

Q: Why is UC2845ADM listed as obsolete?

A: UC2845ADM is marked obsolete by the manufacturer but remains available through inventory channels with 4908 units in stock. This part supports the extended 7.6V ~ 30V supply range and 48% duty cycle specification. Use is acceptable for applications where supply continuity is not critical.

Q: Does UC2844AD8TR support the full -55°C ~ 125°C temperature range?

A: UC2844AD8TR operates across -40°C ~ 85°C (TA), which is narrower than the ISL8841AMBZ specification of -55°C ~ 125°C (TJ). Applications requiring extended temperature operation must confirm circuit performance within the UC2844AD8TR limits or select alternatives with matching temperature specifications.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts carry RoHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the ISL8841AMBZ environmental and regulatory specifications.

Q: What packaging formats are available for substitutes?

A: All substitute parts are supplied in 8-SOIC (0.154", 3.90mm Width) surface mount packaging. Packaging variants include Tube, Tape & Reel (TR), Cut Tape (CT) & Digi-Reel, and Bulk formats. Selection depends on assembly process and quantity requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message