UC1843AMDREP Equivalent & Substitute Parts

Part Overview

The UC1843AMDREP is a PWM controller IC manufactured by Texas Instruments, designed for multiple power supply topologies. This 8-SOIC surface mount device operates across a supply voltage range of 7.9V to 30V and is classified as Active product status. The device is ROHS3 compliant with MSL Level 1 rating, indicating broad compatibility with modern manufacturing processes.

Substitute parts are necessary when the primary part becomes unavailable due to inventory constraints, supply chain disruptions, or when alternative manufacturers' versions offer equivalent functionality within the same electrical and mechanical specifications.

Key Parameters

Parameter	UC1843AMDREP
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage - Supply (Vcc/Vdd)	7.9V ~ 30V
Current - Supply	11 mA
Operating Temperature	-55°C ~ 125°C (TA)
Product Status	Active
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the UC1843AMDREP is determined by the following critical parameters:

Package compatibility: 8-SOIC (0.154", 3.90mm Width) form factor
Supply voltage range overlap: Minimum 7.9V to maximum 30V
Surface mount mounting type
Operating temperature range: Must support at least the application's required temperature window
Functional topology: PWM controller capability for multiple topologies
RoHS and regulatory compliance: ROHS3 compliance and REACH unaffected status

The substitute parts listed below meet these core electrical and mechanical requirements. Parts are grouped by manufacturer and product status to facilitate selection based on availability and supply chain considerations.

Parameter Comparison

Parameter	UC1843AMDREP	ISL6843IBZ-T	SG3842DM	UC2842ADM	UC2842BD1	UC2842BD1013TR	UC2842BD1G	UC2843BD1	UC2843BD1013TR	UC2843BD1G	UC2843BD1R2G
Manufacturer	Texas Instruments	Renesas Electronics	Microchip Technology	Microchip Technology	STMicroelectronics	STMicroelectronics	onsemi	STMicroelectronics	STMicroelectronics	onsemi	onsemi
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Voltage - Supply (Vcc/Vdd)	7.9V ~ 30V	9V ~ 16V	10V ~ 30V	10V ~ 30V	10V ~ 30V	10V ~ 30V	10V ~ 30V	7.6V ~ 30V	7.6V ~ 30V	7.6V ~ 30V	7.6V ~ 30V
Operating Temperature	-55°C ~ 125°C	-40°C ~ 105°C	0°C ~ 70°C	-40°C ~ 85°C	-25°C ~ 85°C	-25°C ~ 85°C	-25°C ~ 85°C	-25°C ~ 85°C	-25°C ~ 85°C	-25°C ~ 85°C	-25°C ~ 85°C
Product Status	Active	Active	Discontinued at DiGi Electronics	Discontinued at DiGi Electronics	Active	Active	Obsolete	Active	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compatibility)

UC2843BD1013TR and UC2843BD1R2G are the preferred substitutes. Both are Active status parts with 8-SOIC packaging, supply voltage range of 7.6V to 30V, and ROHS3 compliance. UC2843BD1013TR offers the highest inventory availability at 32,900 units in Cut Tape & Digi-Reel packaging. UC2843BD1R2G provides 117,700 units in the same packaging format, ensuring supply chain continuity.

Secondary Substitutes (Active Status, Voltage Range Consideration)

UC2842BD1 and UC2842BD1013TR are Active status alternatives with 10V minimum supply voltage, requiring verification that application minimum supply voltage does not fall below 10V. UC2842BD1013TR provides 10,200 units in Cut Tape & Digi-Reel packaging.

Temperature Range Consideration

The UC1843AMDREP operates to -55°C, while all substitute parts operate to minimum -25°C or -40°C. Applications requiring operation below -25°C must retain the original UC1843AMDREP or verify that the substitute's temperature range meets system requirements.

Avoid in New Designs

SG3842DM, UC2842ADM, UC2842BD1G, and UC2843BD1G are discontinued or obsolete status parts. While electrically compatible, these should not be selected for new designs due to supply chain risk.

Frequently Asked Questions (FAQ)

Q: Can I substitute UC2843BD1013TR for UC1843AMDREP in all applications?

A: UC2843BD1013TR is compatible for applications where the minimum supply voltage is 7.6V or higher and operating temperature does not fall below -25°C. The UC1843AMDREP's extended temperature range to -55°C and lower minimum supply voltage of 7.9V provide broader coverage. Verify your application's actual operating conditions before substitution.

Q: What is the difference between UC2843BD1 and UC2843BD1013TR?

A: Both parts are electrically identical UC2843 base devices from STMicroelectronics. The primary difference is packaging: UC2843BD1 is supplied in Tube format, while UC2843BD1013TR is supplied in Cut Tape & Digi-Reel format. Select based on your assembly process requirements.

Q: Why is ISL6843IBZ-T listed as a substitute if its supply voltage range is only 9V to 16V?

A: ISL6843IBZ-T is included because it meets the 8-SOIC package requirement and operates within a subset of the UC1843AMDREP's supply voltage range. It is suitable only for applications with supply voltages between 9V and 16V. Applications requiring operation below 9V or above 16V must use alternative substitutes.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant and REACH unaffected, matching the UC1843AMDREP's regulatory status.

Q: What does MSL Level 3 mean for UC2843BD1 and UC2843BD1013TR?

A: MSL Level 3 indicates a moisture sensitivity level requiring storage at controlled humidity for up to 168 hours before soldering. The UC1843AMDREP's MSL Level 1 has no moisture sensitivity restrictions. For high-volume manufacturing with extended storage periods, MSL Level 1 parts may be preferred.

Q: Can I use SG3842DM as a substitute?

A: SG3842DM is electrically compatible but is discontinued at DiGi Electronics and should not be selected for new designs. Use Active status alternatives such as UC2843BD1013TR or UC2843BD1R2G instead.

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