TL2842D Equivalent & Substitute Parts

Part Overview

The TL2842D 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 device operates as a transistor driver with frequency control capabilities across a 10V to 30V supply voltage range. The TL2842D is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for new production runs and long-term support.

Substiute Parts

TL2842D

Texas InstrumentsIn Stock: 1931TL2842D Datasheet

Current PartRFQ

TL2842BDR

Texas InstrumentsIn Stock: 4784TL2842BDR Datasheet

MFR RecommendedRFQ

UC2842BDG

onsemiIn Stock: 3701UC2842BDG Datasheet

MFR RecommendedRFQ

UC2842BDR2G

onsemiIn Stock: 6931UC2842BDR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TL2842D is determined by strict alignment of the following critical parameters:

• Package / Case: 14-SOIC form factor (0.154", 3.90mm Width)
• Voltage - Supply (Vcc/Vdd): 10V ~ 30V range
• Frequency - Switching: Up to 500kHz capability
• Output Type: Transistor Driver
• Function: Step-Up, Step-Up/Step-Down support
• Topology: Boost and Flyback support (minimum requirement)
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant

The substitute parts identified below meet these core electrical and mechanical requirements. Variations in duty cycle maximum, operating temperature range, and product status are noted but do not preclude substitution when application requirements fall within the substitute part's specifications.

Parameter Comparison

Engineering Selection Recommendations

TL2842BDR is the primary substitute for TL2842D. Both devices are manufactured by Texas Instruments and share identical electrical specifications across all critical parameters. The TL2842BDR is in Active product status with improved moisture sensitivity rating (MSL 1 vs. MSL 2), providing superior long-term reliability. The primary difference is packaging format: TL2842D is supplied in Tube, while TL2842BDR is supplied in Tape & Reel (TR). This substitution is direct and requires no design modification.

UC2842BDR2G is an alternative substitute manufactured by onsemi. This device maintains compatibility across all core electrical parameters and is in Active product status. The UC2842BDR2G operates within a narrower temperature range (-25°C to 85°C versus -40°C to 85°C) and supports Boost and Flyback topologies (Forward topology is not supported). Selection of UC2842BDR2G is appropriate when application operating temperature does not extend below -25°C and Forward topology is not required.

UC2842BDG is not recommended for new designs. Although electrically compatible, this device is in Obsolete product status and carries higher supply risk. The narrower operating temperature range (-25°C to 85°C) and lack of Forward topology support further limit its applicability.

Frequently Asked Questions (FAQ)

Q: Can TL2842BDR directly replace TL2842D without circuit modification?

A: Yes. TL2842BDR is electrically and mechanically identical to TL2842D. Both devices share the same 14-SOIC package, supply voltage range (10V ~ 30V), switching frequency capability (up to 500kHz), and supported topologies (Boost, Flyback, Forward). The only difference is packaging format (Tube versus Tape & Reel). No circuit redesign is required.

Q: What is the key difference between TL2842D and UC2842BDR2G?

A: Both devices support Step-Up and Step-Up/Step-Down functions with identical supply voltage and switching frequency specifications. The primary differences are: (1) Operating temperature range—TL2842D operates from -40°C to 85°C, while UC2842BDR2G operates from -25°C to 85°C; (2) Topology support—TL2842D supports Boost, Flyback, and Forward topologies, while UC2842BDR2G supports only Boost and Flyback. UC2842BDR2G is suitable for applications that do not require Forward topology and operate above -25°C.

Q: Why is UC2842BDG listed if it is Obsolete?

A: UC2842BDG is included for reference and historical compatibility documentation. This device meets the core electrical and mechanical substitution criteria but is in Obsolete product status, indicating discontinued manufacturing and limited availability. UC2842BDG should not be selected for new designs. UC2842BDR2G is the recommended onsemi alternative.

Q: Does packaging format (Tube vs. Tape & Reel) affect electrical performance?

A: No. Packaging format affects only handling, storage, and assembly processes. Tube and Tape & Reel packages contain identical die and electrical specifications. Selection between packaging formats depends on manufacturing process requirements and inventory management practices, not circuit performance.

Q: What does MSL (Moisture Sensitivity Level) mean for component selection?

A: MSL indicates the maximum time a component can be stored in ambient conditions before requiring baking prior to reflow soldering. TL2842D has MSL 2 (1 Year storage limit), while TL2842BDR and UC2842BDR2G have MSL 1 (Unlimited storage). Higher MSL ratings provide greater flexibility in inventory management and reduce risk of moisture-induced soldering defects.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. TL2842D, TL2842BDR, UC2842BDG, and UC2842BDR2G are all ROHS3 Compliant. All devices are also REACH Unaffected and classified under ECCN EAR99.