TL3842BD Equivalent & Substitute Parts

Part Overview

The TL3842BD 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 14-SOIC surface mount device operates with supply voltages from 10V to 30V and supports switching frequencies up to 500kHz with a maximum duty cycle of 96%. The TL3842BD is currently in Last Time Buy status, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

TL3842BD

Texas InstrumentsIn Stock: 1565TL3842BD Datasheet

Current PartRFQ

TL3842BDR

Texas InstrumentsIn Stock: 3415TL3842BDR Datasheet

MFR RecommendedRFQ

UC3842BDG

onsemiIn Stock: 4004UC3842BDG Datasheet

MFR RecommendedRFQ

UC3842BDR2G

onsemiIn Stock: 4243UC3842BDR2G Datasheet

MFR RecommendedRFQ

UC3842BVDR2G

onsemiIn Stock: 3672UC3842BVDR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TL3842BD is determined by the following core parameters:

• Package Compatibility: All substitute parts must use the 14-SOIC (0.154", 3.90mm Width) surface mount package to ensure PCB layout compatibility
• Electrical Specifications: Supply voltage range (10V ~ 30V), switching frequency capability (up to 500kHz), and duty cycle (96% maximum) must be maintained
• Topology Support: Boost, flyback, and forward converter topologies must be supported
• Output Configuration: Positive output configuration is required
• Regulatory Compliance: ROHS3 compliance and MSL 1 rating are mandatory for production environments

The substitute parts listed below meet these core criteria across different manufacturers and packaging formats.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: TL3842BDR (Texas Instruments, Tape & Reel)

The TL3842BDR is the direct equivalent of the TL3842BD, differing only in packaging format (Tape & Reel versus Tube). Both parts share identical electrical specifications, operating temperature range, and regulatory compliance status. The TL3842BDR maintains Active product status, ensuring long-term availability and supply chain stability. This part is suitable for high-volume production environments where tape and reel packaging is standard.

Secondary Recommendation: UC3842BDR2G (onsemi, Tape & Reel)

The UC3842BDR2G is an Active product from onsemi that meets all core electrical and mechanical substitution criteria. It maintains the same 14-SOIC package, supply voltage range, switching frequency capability, and duty cycle specifications. This part provides cross-manufacturer compatibility while maintaining ROHS3 compliance and MSL 1 rating.

Alternative for Extended Temperature Range: UC3842BVDR2G (onsemi, Cut Tape)

The UC3842BVDR2G extends the operating temperature range to -40°C ~ 105°C, compared to the standard 0°C ~ 70°C range of the main part. This part is suitable for applications requiring wider temperature operation. However, this part is marked as Obsolete and should be used only when extended temperature capability is a critical design requirement.

Not Recommended: UC3842BDG (onsemi, Tube)

While the UC3842BDG meets all electrical and mechanical criteria, it is marked as Obsolete and should not be selected for new designs or ongoing production without specific justification.

Frequently Asked Questions (FAQ)

Q: Can I use TL3842BDR as a direct replacement for TL3842BD?

A: Yes. The TL3842BDR is electrically and mechanically identical to the TL3842BD. The only difference is the packaging format: TL3842BDR uses Tape & Reel (TR) packaging while TL3842BD uses Tube packaging. Both parts are suitable for the same PCB designs and applications.

Q: What is the difference between Texas Instruments TL3842 and onsemi UC3842 variants?

A: Both part families meet the same core electrical specifications for boost, flyback, and forward converter topologies. The primary differences are manufacturer, product status, and in some cases, operating temperature range. All listed variants support 10V ~ 30V supply voltage, up to 500kHz switching frequency, and 96% maximum duty cycle.

Q: Are all substitute parts compatible with my existing PCB layout?

A: Yes, all substitute parts use the identical 14-SOIC (0.154", 3.90mm Width) surface mount package. PCB footprints and land patterns are interchangeable across all listed parts.

Q: Why is UC3842BVDR2G marked as Obsolete if it meets the specifications?

A: Product status reflects manufacturer availability and support commitments. Obsolete parts may have limited stock and no guaranteed future availability. For new designs or long-term production, Active status parts such as TL3842BDR or UC3842BDR2G are preferred.

Q: What packaging format should I choose for production?

A: Tape & Reel (TR) packaging is standard for high-volume automated assembly. Tube and Cut Tape (CT) formats are suitable for lower-volume or manual assembly processes. TL3842BDR and UC3842BDR2G both offer Tape & Reel packaging for production environments.

Q: Do all substitute parts have the same RoHS and MSL compliance?

A: Yes, all listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the compliance profile of the TL3842BD.