TL2842DR-8 Equivalent & Substitute Parts

Part Overview

The TL2842DR-8 is a boost, flyback, and forward regulator controller IC manufactured by Texas Instruments, designed for positive output step-up and step-up/step-down DC-DC conversion applications. This 8-SOIC surface mount device operates as a transistor driver with frequency control capabilities across a 10V to 30V supply range. The part is currently in active production status with 2100 units available in inventory. Substitute parts are necessary when addressing supply constraints, packaging preferences, or specific application requirements that align with compatible electrical and mechanical parameters.

Substiute Parts

TL2842DR-8

Texas InstrumentsIn Stock: 2202TL2842DR-8 Datasheet

Current PartRFQ

UC2842BD1

STMicroelectronicsIn Stock: 4264UC2842BD1 Datasheet

MFR RecommendedRFQ

UC2842BD1013TR

STMicroelectronicsIn Stock: 10218UC2842BD1013TR Datasheet

MFR RecommendedRFQ

UC2842BD1G

onsemiIn Stock: 3984UC2842BD1G Datasheet

MFR RecommendedRFQ

UC3844BD1013TR

STMicroelectronicsIn Stock: 2203UC3844BD1013TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TL2842DR-8 is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Voltage Supply Range: 10V ~ 30V (must match or exceed)
• Switching Frequency: Up to 500kHz (must support)
• Output Type: Transistor Driver
• Topology: Boost and/or Flyback capability
• Output Configuration: Positive output

Mechanical Compatibility Requirements:

• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount

Regulatory & Environmental Requirements:

• RoHS3 Compliance
• Operating Temperature Range: Must support application requirements

The substitute parts listed below meet these core electrical and mechanical parameters, enabling direct functional replacement in applications designed for the TL2842DR-8.

Parameter Comparison

Engineering Selection Recommendations

UC2842BD1 and UC2842BD1013TR (STMicroelectronics)

Both UC2842 variants are active production parts with ROHS3 compliance and superior moisture sensitivity ratings (MSL 1, Unlimited). The UC2842BD1013TR offers the highest inventory availability at 10200 units and is packaged in Cut Tape & Digi-Reel format. These parts support boost and flyback topologies with identical electrical parameters to the TL2842DR-8, with the exception of a 96% maximum duty cycle versus 97%. The operating temperature range is narrower (-25°C to 85°C) compared to the TL2842DR-8 (-40°C to 85°C), which may require evaluation for low-temperature applications.

UC2842BD1G (onsemi)

This part is marked as obsolete and should not be selected for new designs or long-term supply planning, despite adequate current inventory of 3900 units. The obsolete status indicates discontinued manufacturing and potential future supply discontinuation.

UC3844BD1013TR (STMicroelectronics)

This part is an active production substitute with ROHS3 compliance and MSL 1 rating. However, the maximum duty cycle is significantly reduced to 48% compared to the TL2842DR-8's 97%, and the operating temperature range is further restricted to 0°C to 70°C. These parameter reductions limit applicability to specific circuit topologies and environmental conditions. Selection of this part requires verification that the application design accommodates the reduced duty cycle specification.

Frequently Asked Questions (FAQ)

Q: Can UC2842BD1 directly replace TL2842DR-8 in existing designs?

A: UC2842BD1 and UC2842BD1013TR are electrically compatible substitutes for boost and flyback topologies. Both support the same 10V to 30V supply range and 500kHz switching frequency. The primary design consideration is the 96% maximum duty cycle versus the TL2842DR-8's 97%. Applications operating near maximum duty cycle require circuit verification. The narrower operating temperature range (-25°C to 85°C) must be evaluated against application requirements.

Q: What is the difference between UC2842BD1 and UC2842BD1013TR?

A: Both parts are electrically identical UC2842 controllers from STMicroelectronics. The primary difference is packaging: UC2842BD1 is supplied in Tube format, while UC2842BD1013TR is supplied in Cut Tape & Digi-Reel format. UC2842BD1013TR has significantly higher inventory availability (10200 units versus 4247 units). Selection depends on procurement and assembly requirements.

Q: Why is UC3844BD1013TR listed as a substitute if the duty cycle is only 48%?

A: UC3844BD1013TR meets the core mechanical and electrical compatibility requirements (8-SOIC package, 10V to 30V supply, 500kHz switching frequency, transistor driver output). However, the 48% maximum duty cycle represents a significant functional limitation compared to the TL2842DR-8's 97%. This part is suitable only for applications designed to operate within the 48% duty cycle constraint and should not be used as a general replacement without circuit redesign verification.

Q: Should UC2842BD1G be considered for new designs?

A: No. UC2842BD1G is marked as obsolete, indicating discontinued manufacturing. While current inventory of 3900 units is available, obsolete status means future supply cannot be guaranteed. New designs should utilize active production parts such as UC2842BD1013TR or UC2842BD1 from STMicroelectronics.

Q: What are the moisture sensitivity implications of selecting a substitute?

A: The TL2842DR-8 has MSL 2 (1 Year), while all listed substitutes have MSL 1 (Unlimited). MSL 1 represents superior moisture resistance and longer shelf life without baking requirements. This is a favorable characteristic for inventory management and long-term storage.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the TL2842DR-8's regulatory status. All parts are also REACH Unaffected and classified as EAR99 for export control purposes.