TL2842BDR-8 Equivalent & Substitute Parts

Part Overview

The TL2842BDR-8 is a Boost, Flyback, Forward Regulator controller IC manufactured by Texas Instruments, designed for positive output step-up and step-up/step-down DC-DC conversion topologies. This 8-SOIC surface mount device operates across a 10V to 30V supply voltage range with switching frequencies up to 500kHz and a maximum duty cycle of 96%. The part is currently active in production status with 2400 units in stock.

Substitute parts are necessary when the TL2842BDR-8 becomes unavailable, when alternative packaging formats are required, or when design flexibility demands controller options from different manufacturers while maintaining equivalent electrical and mechanical performance.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	TL2842BDR-8
Category	Power Management (PMIC)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Topology	Boost, Flyback, Forward
Output Configuration	Positive
Voltage - Supply (Vcc/Vdd)	10V ~ 30V
Frequency - Switching	Up to 500kHz
Duty Cycle (Max)	96%
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the TL2842BDR-8 is determined by the following critical parameters:

Primary Substitution Criteria:

Package / Case: 8-SOIC (0.154", 3.90mm Width) — mechanical and electrical pin compatibility
Voltage - Supply (Vcc/Vdd): 10V ~ 30V — input voltage range compatibility
Frequency - Switching: Up to 500kHz — switching frequency capability
Duty Cycle (Max): 96% — maximum duty cycle support
Topology: Boost, Flyback, Forward — functional topology support
Output Configuration: Positive — output polarity requirement
Mounting Type: Surface Mount — assembly compatibility
RoHS Status: ROHS3 Compliant — regulatory compliance

Secondary Considerations:

Operating Temperature range may vary; parts with narrower ranges (0°C ~ 70°C) are substitutable for applications within that narrower window
Moisture Sensitivity Level (MSL) variations do not affect electrical substitution but impact storage and handling requirements
Product Status (Active, Discontinued, Obsolete) indicates availability but does not affect electrical equivalence

Substitute parts meeting all primary criteria are electrically and mechanically equivalent to the TL2842BDR-8 and can be used interchangeably in circuit designs.

Parameter Comparison

Parameter	TL2842BDR-8	SG3842DM	UC2842ADM	UC2842BD1	UC2842BD1013TR	UC2842BD1G	UC2843BD1	UC2843BD1013TR	UC2843BD1G	UC2843BD1R2G	UC3842BD1G
Manufacturer	Texas Instruments	Microchip Technology	Microchip Technology	STMicroelectronics	STMicroelectronics	onsemi	STMicroelectronics	STMicroelectronics	onsemi	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
Voltage - Supply (Vcc/Vdd)	10V ~ 30V	10V ~ 30V	10V ~ 30V	10V ~ 30V	10V ~ 30V	10V ~ 30V	7.6V ~ 30V	7.6V ~ 30V	7.6V ~ 30V	7.6V ~ 30V	10V ~ 30V
Frequency - Switching	Up to 500kHz	100Hz ~ 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
Duty Cycle (Max)	96%	95%	96%	96%	96%	96%	96%	96%	96%	96%	96%
Topology	Boost, Flyback, Forward	Flyback	Boost, Buck, Flyback, Forward	Boost, Flyback	Boost, Flyback	Boost, Flyback	Boost, Flyback	Boost, Flyback	Boost, Flyback	Boost, Flyback	Boost, Flyback
Output Configuration	Positive	Isolated	Positive, Isolation Capable	Positive, Isolation Capable	Positive, Isolation Capable	Positive, Isolation Capable	Positive, Isolation Capable	Positive, Isolation Capable	Positive, Isolation Capable	Positive, Isolation Capable	Positive, Isolation Capable
Operating Temperature	-40°C ~ 85°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	0°C ~ 70°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	Discontinued at DiGi Electronics	Discontinued at DiGi Electronics	Active	Active	Obsolete	Active	Active	Obsolete	Active	Obsolete

Engineering Selection Recommendations

Full Electrical Equivalents (Recommended Primary Substitutes):

UC2842BD1013TR and UC2843BD1013TR from STMicroelectronics are the preferred substitutes. Both parts maintain the complete parameter set of the TL2842BDR-8, including the 10V ~ 30V supply voltage range (UC2843 extends to 7.6V), 96% maximum duty cycle, and -25°C ~ 85°C operating temperature. Both are currently in Active production status with high inventory availability (10,200 and 32,900 units respectively). These parts are ROHS3 compliant and carry identical ECCN and HTSUS classifications.

UC2843BD1R2G from onsemi is an alternative with Active status and the highest inventory level (117,700 units). This part operates across 7.6V ~ 30V, providing extended low-voltage capability. It maintains all other critical parameters and is ROHS3 compliant.

Conditional Substitutes (Temperature Range Limitations):

UC3842BD1G and SG3842DM are substitutable only for applications operating within the 0°C ~ 70°C temperature range. Both parts are ROHS3 compliant but have narrower operating temperature specifications than the TL2842BDR-8. SG3842DM additionally specifies a 95% maximum duty cycle versus 96%, which may impact designs requiring the full duty cycle range.

Topology-Specific Considerations:

UC2842ADM supports Boost, Buck, Flyback, and Forward topologies, providing additional functional flexibility beyond the TL2842BDR-8's Boost, Flyback, Forward set. This part is suitable for designs requiring buck converter capability. However, it is discontinued at DiGi Electronics.

Obsolete Parts (Not Recommended for New Designs):

UC2842BD1G, UC2843BD1G, and UC3842BD1G carry Obsolete status and should not be selected for new production designs despite electrical equivalence.

Frequently Asked Questions (FAQ)

Q: Can UC2843BD1013TR directly replace TL2842BDR-8 in existing designs?

A: Yes. UC2843BD1013TR is electrically and mechanically equivalent. Both use 8-SOIC packaging, support 10V ~ 30V supply voltage, achieve up to 500kHz switching frequency, and maintain 96% maximum duty cycle. The UC2843 extends the minimum supply voltage to 7.6V, which does not affect designs requiring 10V minimum. Pin-for-pin compatibility is maintained.

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

A: The UC2843 series extends the minimum supply voltage specification to 7.6V compared to UC2842's 10V minimum. Both series support identical topologies, switching frequencies, and duty cycles. The UC2843 provides broader supply voltage flexibility for low-voltage applications.

Q: Why is SG3842DM listed as a substitute if it has a 95% duty cycle instead of 96%?

A: SG3842DM meets all primary substitution criteria including 8-SOIC packaging, 10V ~ 30V supply voltage, and up to 500kHz switching frequency. The 1% duty cycle difference (95% vs 96%) is a minor specification variance. However, designs requiring the full 96% duty cycle should select alternatives with matching specifications.

Q: Are there packaging format alternatives to 8-SOIC?

A: The substitute parts listed are all specified in 8-SOIC packaging to maintain mechanical and electrical pin compatibility. No alternative package formats are included in this equivalency list. Different packaging would require separate circuit board layout modifications.

Q: Can I use UC2842ADM in a design that requires boost converter topology?

A: Yes. UC2842ADM supports Boost, Buck, Flyback, and Forward topologies, which includes the boost converter function required by the TL2842BDR-8. However, this part is discontinued at DiGi Electronics, making it unsuitable for new production designs despite electrical capability.

Q: What is the impact of different operating temperature ranges on substitution?

A: Parts with narrower operating temperature ranges (0°C ~ 70°C) are substitutable only for applications operating within that narrower window. If your design requires the full -40°C ~ 85°C range of the TL2842BDR-8, select substitutes specifying -40°C ~ 85°C or -25°C ~ 85°C operating temperature.

Q: Which substitute has the best current availability?

A: UC2843BD1R2G from onsemi has the highest inventory level at 117,700 units in stock. UC2843BD1013TR from STMicroelectronics is the second option with 32,900 units available. Both are in Active production status.

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