UC2843NG4 Equivalent & Substitute Parts

Part Overview

The UC2843NG4 is a Power Management Integrated Circuit (PMIC) functioning as a PWM controller for multiple power supply topologies. Manufactured by Texas Instruments in 8-PDIP packaging, this component is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives. The UC2843NG4 operates across a supply voltage range of 12V to 28V with a maximum supply current of 11 mA, supporting applications requiring multi-topology power conversion control. Due to its discontinued status, equivalent parts from active product lines provide direct functional replacement while maintaining design compatibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	UC2843NG4
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Voltage - Supply	12V ~ 28V
Current - Supply	11 mA
Operating Temperature	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution of the UC2843NG4 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Package / Case: 8-DIP (0.300", 7.62mm) — ensures mechanical and pin compatibility
Mounting Type: Through Hole — maintains PCB assembly compatibility
Voltage - Supply: 10V ~ 30V or 12V ~ 28V range — ensures operational compatibility within design specifications
Current - Supply: 11 mA nominal — confirms power delivery requirements
Operating Temperature: -40°C ~ 85°C or -25°C ~ 85°C — validates thermal operating envelope
RoHS Status: ROHS3 Compliant — maintains regulatory compliance

Substitution Categories:

MFR Recommended (Direct Manufacturer Equivalent): UC2843N — identical base product number with active product status
Parametric Equivalent: UC2842N — same manufacturer, compatible electrical specifications, different control topology
Cross-Manufacturer Equivalents: UC2842AM, SG2842M, UC2842BN, UC2842BNG, UC2843BN, UC2843BNG, UC3842AM, UC3842BN — functionally equivalent across multiple manufacturers with matching package and electrical parameters

Parameter Comparison

Parameter	UC2843NG4	UC2843N	UC2842N	UC2842AM	SG2842M	UC2842BN	UC2842BNG	UC2843BN	UC2843BNG	UC3842AM	UC3842BN
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Microchip Technology	Microchip Technology	STMicroelectronics	onsemi	STMicroelectronics	onsemi	Microchip Technology	STMicroelectronics
Package / Case	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Voltage - Supply (Vcc/Vdd)	12V ~ 28V	12V ~ 28V	12V ~ 28V	10V ~ 30V	10V ~ 30V	10V ~ 30V	10V ~ 30V	7.6V ~ 30V	7.6V ~ 30V	10V ~ 30V	10V ~ 30V
Current - Supply	11 mA	11 mA	11 mA	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-25°C ~ 85°C (TA)	-25°C ~ 85°C (TA)	-25°C ~ 85°C (TA)	-25°C ~ 85°C (TA)	-25°C ~ 85°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TJ)
Frequency - Switching	Not specified	Not specified	Not specified	Up to 500kHz	100Hz ~ 500kHz	Up to 500kHz	Up to 500kHz	Up to 500kHz	Up to 500kHz	Up to 500kHz	Up to 500kHz
Duty Cycle (Max)	Not specified	Not specified	Not specified	96%	95%	96%	96%	96%	96%	96%	96%
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics	Active	Active	Discontinued at DiGi Electronics	Discontinued at DiGi Electronics	Active	Active	Active	Active	Discontinued at DiGi Electronics	Active

Engineering Selection Recommendations

Primary Recommendation: UC2843N

The UC2843N represents the direct manufacturer equivalent from Texas Instruments with active product status. This part maintains identical electrical specifications (12V ~ 28V supply, 11 mA supply current, -40°C ~ 85°C operating range) and mechanical compatibility (8-DIP package, through-hole mounting). ROHS3 compliance and active availability ensure long-term supply chain stability.

Secondary Recommendations (Cross-Manufacturer Equivalents):

UC2843BN (STMicroelectronics) and UC2843BNG (onsemi) provide functionally equivalent alternatives with expanded supply voltage range (7.6V ~ 30V), maintaining the UC2843 base product topology. Both are active products with ROHS3 compliance. Operating temperature range narrows to -25°C ~ 85°C, suitable for applications not requiring the full -40°C lower limit.

UC2842BN (STMicroelectronics) and UC2842BNG (onsemi) offer parametric equivalence with UC2842 topology, supporting identical supply voltage (10V ~ 30V) and switching frequency specifications (up to 500kHz). These parts are active with ROHS3 compliance and represent viable alternatives where UC2843-specific control characteristics are not mandatory.

Discontinued Parts (Not Recommended for New Designs):

UC2842AM, SG2842M, and UC3842AM are discontinued at DiGi Electronics. While electrically compatible, these parts should not be selected for new designs due to supply uncertainty.

Frequently Asked Questions (FAQ)

Q: Can UC2843N directly replace UC2843NG4 without PCB modifications?

A: Yes. Both parts share identical package specifications (8-DIP, 0.300" pitch), through-hole mounting, and electrical parameters (12V ~ 28V supply, 11 mA current, -40°C ~ 85°C operating range). Pin-for-pin compatibility is confirmed.

Q: What is the difference between UC2843 and UC2842 series?

A: Both are PWM controllers in the UCx84x family with compatible electrical specifications. The UC2843 and UC2842 differ in internal control topology. UC2843 implements voltage-mode control, while UC2842 implements current-mode control. Selection depends on application-specific control requirements. Electrical parameters (supply voltage, current, temperature range, package) remain compatible for substitution purposes.

Q: Are cross-manufacturer parts (STMicroelectronics, onsemi, Microchip) fully compatible?

A: Cross-manufacturer parts with matching base product numbers (UC2843BN, UC2843BNG) maintain pin-for-pin compatibility and equivalent electrical specifications. Operating temperature ranges may differ (-25°C ~ 85°C versus -40°C ~ 85°C). Verify application temperature requirements before selection. All listed alternatives maintain ROHS3 compliance and 8-DIP packaging.

Q: Why does UC2843BNG show 7.6V minimum supply voltage instead of 12V?

A: UC2843BNG (onsemi) specifies a lower minimum supply voltage (7.6V ~ 30V) compared to UC2843NG4 (12V ~ 28V). This represents an expanded operating range. For applications designed around 12V ~ 28V specifications, UC2843BNG remains fully compatible and provides additional operational flexibility at lower supply voltages.

Q: Which substitute part has the highest inventory availability?

A: UC2843BNG (onsemi) maintains the highest inventory at 25,200 pieces, followed by UC2843BN (STMicroelectronics) at 20,527 pieces. Both are active products with immediate availability.

Q: Can UC3842BN replace UC2843NG4?

A: UC3842BN shares identical package (8-DIP), mounting type (through-hole), and core electrical specifications (10V ~ 30V supply, up to 500kHz switching frequency, 96% maximum duty cycle). However, operating temperature range is narrower (0°C ~ 70°C versus -40°C ~ 85°C). Selection requires confirmation that application temperature requirements fall within 0°C ~ 70°C limits. UC3842BN is an active product with high inventory (55,100 pieces).

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