SG2843DM Equivalent & Substitute Parts

Part Overview

The SG2843DM is a buck regulator positive output step-down DC-DC controller IC manufactured by Microchip Technology in 8-SOIC surface mount packaging. This device functions as a transistor driver for step-down topologies with a single output phase and operates across a supply voltage range of 7.6V to 30V with switching frequencies up to 500kHz and a maximum duty cycle of 95%.

The SG2843DM is currently in active product status with substantial inventory availability (89,999 pieces). Equivalent and substitute parts are identified based on matching electrical characteristics, package compatibility, and functional topology support. Alternative models are necessary when the primary part is unavailable, when different packaging formats are required for manufacturing processes, or when extended temperature operating ranges are needed for specific applications.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Part Number	SG2843DM
Category	Power Management (PMIC)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Output Type	Transistor Driver
Function	Step-Down
Output Configuration	Positive
Topology	Buck
Number of Outputs	1
Output Phases	1
Voltage - Supply (Vcc/Vdd)	7.6V ~ 30V
Frequency - Switching	1Hz ~ 500kHz
Duty Cycle (Max)	95%
Operating Temperature	-25°C ~ 85°C (TA)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the SG2843DM are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Package / Case: 8-SOIC (0.154", 3.90mm Width) — ensures mechanical and electrical pin compatibility
Output Type: Transistor Driver — maintains functional equivalence
Output Configuration: Positive — ensures polarity compatibility
Number of Outputs: 1 — confirms single-output architecture
Output Phases: 1 — maintains phase configuration
Voltage - Supply (Vcc/Vdd): 7.6V ~ 30V or compatible range — ensures supply voltage compatibility
Frequency - Switching: Up to 500kHz — confirms switching frequency capability
Mounting Type: Surface Mount — maintains assembly compatibility
RoHS Status: ROHS3 Compliant — ensures regulatory compliance

Topology Considerations: The SG2843DM operates in buck (step-down) topology. Substitute parts identified include devices supporting buck topology as well as multi-topology controllers (boost, flyback, forward) that include buck capability. Multi-topology controllers are functionally compatible when buck operation is required, as they contain the necessary control circuitry for step-down applications.

Temperature Range: The SG2843DM operates from -25°C to 85°C. Substitute parts with extended temperature ranges (-40°C to 85°C) provide broader operational capability and are considered compatible for applications within the SG2843DM's specified range.

Parameter Comparison

Parameter	SG2843DM	TL2842BD-8	TL2842BDR-8	TL2843BD-8	TL2843BDR-8	TL2843BDRG4-8	TL2843D-8	TL2843DG4-8	TL2843DR-8	TL2843DRG4-8	UC2842AD8
Manufacturer	Microchip Technology	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	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	8-SOIC
Output Type	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver	PWM Controller
Output Configuration	Positive	Positive	Positive	Positive	Positive	Positive	Positive	Positive	Positive	Positive	Not Specified
Number of Outputs	1	1	1	1	1	1	1	1	1	1	Not Specified
Output Phases	1	1	1	1	1	1	1	1	1	1	Not Specified
Voltage - Supply (Vcc/Vdd)	7.6V ~ 30V	10V ~ 30V	10V ~ 30V	7.6V ~ 30V	7.6V ~ 30V	7.6V ~ 30V	7.6V ~ 30V	7.6V ~ 30V	7.6V ~ 30V	7.6V ~ 30V	10V ~ 30V
Frequency - Switching	1Hz ~ 500kHz	Up to 500kHz	Up to 500kHz	Up to 500kHz	Up to 500kHz	Up to 500kHz	Up to 500kHz	Up to 500kHz	Up to 500kHz	Up to 500kHz	Not Specified
Duty Cycle (Max)	95%	96%	96%	96%	96%	96%	97%	97%	97%	97%	Not Specified
Operating Temperature	-25°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
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	Active	Last Time Buy	Active	Last Time Buy	Active	Active	Last Time Buy	Last Time Buy	Active	Active	Last Time Buy

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The TL2843 series from Texas Instruments (TL2843BD-8, TL2843BDR-8, TL2843BDRG4-8, TL2843D-8, TL2843DG4-8, TL2843DR-8, TL2843DRG4-8) provides the closest functional equivalence to the SG2843DM. These devices match the supply voltage range (7.6V ~ 30V), switching frequency capability (up to 500kHz), and 8-SOIC package. The TL2843 series supports multi-topology operation including buck functionality, making them suitable for step-down applications. Multiple packaging options (Tube, Tape & Reel, Cut Tape & Digi-Reel) are available to accommodate different manufacturing processes. All variants are ROHS3 compliant with MSL 1 rating.

Active Product Status Variants:

For applications requiring active product status with ongoing manufacturing support, select from: TL2843BDR-8, TL2843BDRG4-8, TL2843DR-8, or TL2843DRG4-8. These variants maintain full supply voltage compatibility (7.6V ~ 30V) and offer extended operating temperature range (-40°C ~ 85°C) compared to the SG2843DM (-25°C ~ 85°C).

Secondary Substitutes (Limited Compatibility):

The TL2842BD-8 and TL2842BDR-8 from Texas Instruments provide functional substitution with the following constraint: minimum supply voltage is 10V (versus 7.6V for SG2843DM). These devices are suitable only for applications where the supply voltage remains at or above 10V. Both support multi-topology operation and are available in 8-SOIC packaging with ROHS3 compliance.

The UC2842AD8 from Texas Instruments is available in 8-SOIC packaging and is ROHS3 compliant. However, this device has limited parameter specification in the provided data and should be evaluated for specific application requirements before selection.

Packaging Considerations:

Tube packaging: TL2842BD-8, TL2843BD-8, TL2843D-8, TL2843DG4-8, UC2842AD8
Tape & Reel (TR): TL2842BDR-8, TL2843BDR-8, TL2843DR-8, TL2843DRG4-8, TL2843BDRG4-8
Cut Tape (CT) & Digi-Reel: TL2843BDR-8

Frequently Asked Questions (FAQ)

Q: Can the TL2843 series directly replace the SG2843DM in existing designs?

A: Yes, the TL2843 series provides direct pin-compatible replacement in 8-SOIC packaging. The electrical characteristics (supply voltage 7.6V ~ 30V, switching frequency up to 500kHz, single output phase, positive output configuration) are compatible with the SG2843DM. Multi-topology support in the TL2843 series includes buck operation required for step-down applications. Verify that your specific application does not depend on the SG2843DM's minimum operating temperature of -25°C, as TL2843 variants operate from -40°C.

Q: What is the difference between TL2843BD-8 and TL2843BDR-8?

A: The primary difference is packaging format. TL2843BD-8 is supplied in Tube packaging, while TL2843BDR-8 is supplied in Tape & Reel (TR) format. Both devices are electrically identical with identical electrical specifications. Tube packaging is typically used for manual assembly or small-quantity applications, while Tape & Reel format is standard for automated pick-and-place manufacturing processes. Product status differs: TL2843BD-8 is Last Time Buy, while TL2843BDR-8 is Active.

Q: Why do some substitute parts have higher maximum duty cycle ratings?

A: The TL2843 series and TL2842 series have maximum duty cycle ratings of 96-97%, compared to the SG2843DM's 95%. This represents a design characteristic difference between manufacturers. For applications requiring operation near maximum duty cycle limits, verify that the specific application design accommodates the SG2843DM's 95% maximum before substituting with higher-rated devices. In most practical buck converter designs, duty cycle operation remains well below these maximum ratings.

Q: Is the TL2842 series suitable as a substitute if my supply voltage is below 10V?

A: No. The TL2842BD-8 and TL2842BDR-8 have a minimum supply voltage specification of 10V, while the SG2843DM operates from 7.6V. If your application requires supply voltages between 7.6V and 10V, use TL2843 series variants instead, which maintain the 7.6V minimum specification.

Q: What is the significance of the temperature range difference between SG2843DM and substitute parts?

A: The SG2843DM operates from -25°C to 85°C, while most TL2843 and TL2842 variants operate from -40°C to 85°C. The substitute parts provide extended low-temperature capability. For applications operating within the SG2843DM's specified range (-25°C to 85°C), this difference is not functionally significant. For applications requiring operation below -25°C, substitute parts with -40°C minimum rating are necessary.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (TL2842 and TL2843 series, UC2842AD8) are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), matching the SG2843DM's compliance status. All parts are also REACH Unaffected and classified as EAR99 for export control purposes.

Q: Which substitute should I select for new design implementations?

A: For new designs, select from Active product status variants: TL2843BDR-8, TL2843BDRG4-8, TL2843DR-8, or TL2843DRG4-8. These devices ensure long-term manufacturing availability and support. Choose Tape & Reel packaging variants (BDR or DRG4 designations) for automated assembly processes. All four variants maintain full electrical compatibility with the SG2843DM while providing extended operating temperature range (-40°C to 85°C).

Q: Can I use UC2842AD8 as a substitute?

A: UC2842AD8 is available in compatible 8-SOIC packaging and is ROHS3 compliant. However, complete electrical parameter specifications are not provided in the reference data. Before selecting UC2842AD8, obtain detailed datasheet specifications and verify compatibility with your specific application requirements, particularly regarding switching frequency capability, duty cycle rating, and control features.

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