TL3842DRE4-8 Equivalent & Substitute Parts

Part Overview

The TL3842DRE4-8 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 as a transistor driver with frequency control capabilities across switching frequencies up to 500kHz. The part is currently active in production with 2000 units in stock.

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design flexibility demands selection from multiple qualified suppliers while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Topology	Boost, Flyback, Forward
Output Configuration	Positive
Voltage Supply Range (Vcc/Vdd)	10V ~ 30V
Switching Frequency	Up to 500kHz
Duty Cycle (Max)	97%
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the TL3842DRE4-8 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Package / Case: 8-SOIC (0.154", 3.90mm Width) — ensures PCB footprint compatibility
Mounting Type: Surface Mount — required for assembly process compatibility
Voltage Supply Range: 10V ~ 30V minimum overlap — ensures circuit operation within specified rails
Switching Frequency: Up to 500kHz capability — maintains design frequency headroom
Topology Support: Boost, Flyback, or Forward configurations — determines functional application suitability
RoHS3 Compliance: Required for regulatory and supply chain alignment

Substitution Categories:

Parametric Equivalent: Parts with identical electrical specifications and packaging, differing only in manufacturer or packaging format (tape & reel vs. bulk).

Direct Manufacturer Equivalent: Parts from alternative manufacturers with compatible topologies and electrical ratings, including flyback-specific variants.

Upgrade Parts: Controllers with extended temperature ranges, additional topology support (buck capability), or improved isolation features while maintaining core electrical compatibility.

Manufacturer Recommended: Parts designated by original equipment manufacturers as direct replacements, including obsolete and active status variants.

Parameter Comparison

Part Number	Manufacturer	Topology	Vcc/Vdd Range	Max Frequency	Duty Cycle (Max)	Temp Range	Package	Status	Inventory
TL3842DRE4-8	Texas Instruments	Boost, Flyback, Forward	10V ~ 30V	500kHz	97%	0°C ~ 70°C	8-SOIC	Active	2000
TL3842DR-8	Texas Instruments	Boost, Flyback, Forward	10V ~ 30V	500kHz	97%	0°C ~ 70°C	8-SOIC	Active	20690
SG3842DM	Microchip Technology	Flyback	10V ~ 30V	500kHz	95%	0°C ~ 70°C	8-SOIC	Discontinued	3449
UC2842ADM	Microchip Technology	Boost, Buck, Flyback, Forward	10V ~ 30V	500kHz	96%	-40°C ~ 85°C	8-SOIC	Discontinued	2977
UC2842BD1	STMicroelectronics	Boost, Flyback	10V ~ 30V	500kHz	96%	-25°C ~ 85°C	8-SOIC	Active	4247
UC2842BD1013TR	STMicroelectronics	Boost, Flyback	10V ~ 30V	500kHz	96%	-25°C ~ 85°C	8-SOIC	Active	10200
UC2843BD1	STMicroelectronics	Boost, Flyback	7.6V ~ 30V	500kHz	96%	-25°C ~ 85°C	8-SOIC	Active	1885
UC2843BD1013TR	STMicroelectronics	Boost, Flyback	7.6V ~ 30V	500kHz	96%	-25°C ~ 85°C	8-SOIC	Active	32900
UC3842BD1G	onsemi	Boost, Flyback	10V ~ 30V	500kHz	96%	0°C ~ 70°C	8-SOIC	Obsolete	2080
UC3842BD1R2G	onsemi	Boost, Flyback	10V ~ 30V	500kHz	96%	0°C ~ 70°C	8-SOIC	Active	88772
UC3842BVD1R2G	onsemi	Boost, Flyback	10V ~ 30V	500kHz	96%	-40°C ~ 105°C	8-SOIC	Active	2200

Engineering Selection Recommendations

Primary Equivalent (Highest Compatibility): TL3842DR-8 from Texas Instruments is the direct parametric equivalent, offering identical electrical specifications and the same 0°C ~ 70°C operating range as the TL3842DRE4-8. The primary difference is packaging format (tape & reel vs. digi-reel). This part maintains full compatibility with existing designs and carries active product status with substantial inventory availability (20,690 units).

Active Status Alternatives: UC3842BD1R2G (onsemi) and UC3842BVD1R2G (onsemi) are manufacturer-recommended alternatives with active production status. UC3842BD1R2G matches the 0°C ~ 70°C temperature range and provides the highest inventory level (88,772 units). UC3842BVD1R2G extends the operating range to -40°C ~ 105°C, suitable for applications requiring enhanced thermal performance.

UC2842BD1013TR (STMicroelectronics) and UC2843BD1013TR (STMicroelectronics) are active alternatives with extended temperature ranges (-25°C ~ 85°C and -25°C ~ 85°C respectively) and high inventory availability. UC2843BD1013TR offers the largest stock position (32,900 units) among active alternatives.

Discontinued Parts: SG3842DM (Microchip Technology) and UC2842ADM (Microchip Technology) are discontinued at DiGi Electronics and should be considered only when existing inventory requirements or legacy design constraints necessitate their use. Both maintain electrical compatibility within the 10V ~ 30V supply range and 500kHz frequency specification.

Compliance Alignment: All listed substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original TL3842DRE4-8 specification.

Frequently Asked Questions (FAQ)

Q: Can UC2843BD1013TR replace TL3842DRE4-8 in my design? A: UC2843BD1013TR is electrically compatible within the core parameters: 8-SOIC package, 10V ~ 30V supply range (UC2843 supports 7.6V ~ 30V, which encompasses the required range), 500kHz maximum frequency, and boost/flyback topology support. The UC2843 variant has a lower minimum supply voltage (7.6V vs. 10V), which does not restrict compatibility. Operating temperature differs (UC2843: -25°C ~ 85°C vs. TL3842: 0°C ~ 70°C), so thermal performance must be evaluated for your specific application environment.

Q: What is the difference between TL3842DRE4-8 and TL3842DR-8? A: Both parts are manufactured by Texas Instruments with identical electrical specifications. The difference is packaging format: TL3842DRE4-8 is supplied in tape & reel (TR) format, while TL3842DR-8 is supplied in digi-reel format. Both are 8-SOIC surface mount packages with identical PCB footprints. Selection depends on your manufacturing process requirements for tape format compatibility.

Q: Why is UC3842BVD1R2G listed as an alternative if it has a different temperature range? A: UC3842BVD1R2G is included as a manufacturer-recommended alternative because it maintains all critical electrical parameters: 8-SOIC package, 10V ~ 30V supply range, 500kHz frequency capability, and boost/flyback topology support. The extended temperature range (-40°C ~ 105°C) represents an upgrade capability rather than a limitation. Use this part only if your application requires operation beyond the original 0°C ~ 70°C specification or if you need enhanced thermal margin.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance certification and REACH unaffected status, matching the regulatory requirements of the TL3842DRE4-8.

Q: Which substitute has the best inventory availability? A: UC3842BD1R2G (onsemi) offers the highest inventory level at 88,772 units in active production status. UC2843BD1013TR (STMicroelectronics) is the second option with 32,900 units available.

Q: Can I use SG3842DM as a long-term solution? A: SG3842DM is discontinued at DiGi Electronics and should not be selected for new designs or long-term production. While electrically compatible, its discontinued status creates supply chain risk. Use only if existing inventory must be consumed or legacy designs require this specific part number.

Q: What topology limitations should I consider when selecting a substitute? A: The TL3842DRE4-8 supports boost, flyback, and forward topologies. Most substitutes support boost and flyback configurations. UC2842ADM and UC2842BD1 additionally support buck topology, which does not restrict their use in boost/flyback applications. SG3842DM is limited to flyback topology, making it unsuitable for boost or forward converter designs.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message