TL2843DRE4 Equivalent & Substitute Parts

Part Overview

The TL2843DRE4 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 part is classified as a Power Management PMIC with transistor driver output capability. The TL2843DRE4 is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and production requirements.

Substiute Parts

TL2843DRE4

Texas InstrumentsIn Stock: 814TL2843DRE4 Datasheet

Current PartRFQ

TL2843DR

Texas InstrumentsIn Stock: 6320TL2843DR Datasheet

Parametric EquivalentRFQ

UC2843BDG

onsemiIn Stock: 3434UC2843BDG Datasheet

MFR RecommendedRFQ

UC2843BDR2G

onsemiIn Stock: 4015UC2843BDR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TL2843DRE4 is determined by strict alignment of the following electrical and mechanical parameters:

• Voltage supply range: 7.6V ~ 30V
• Switching frequency capability: Up to 500kHz
• Package type: 14-SOIC form factor
• Output configuration: Positive output
• Topology support: Boost, Flyback, Forward (minimum Boost and Flyback)
• Duty cycle maximum: 96% or higher
• Operating temperature range: Must support -40°C ~ 85°C or equivalent industrial range
• Mounting type: Surface Mount
• RoHS3 compliance

Substitute parts are grouped into two categories: parametric equivalents (identical electrical and mechanical specifications) and manufacturer-recommended alternatives (functionally compatible with minor specification variations).

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: TL2843DR

The TL2843DR is the direct parametric equivalent to the TL2843DRE4. Both parts are manufactured by Texas Instruments and share identical electrical specifications including voltage supply range (7.6V ~ 30V), switching frequency (up to 500kHz), duty cycle maximum (97%), and operating temperature range (-40°C ~ 85°C). The only difference is packaging format: TL2843DR is supplied in Tape & Reel (TR) format versus tube packaging for the TL2843DRE4. The TL2843DR maintains active product status, ensuring long-term availability and supply chain stability. This part is recommended as the primary replacement for new designs and production continuity.

Secondary Substitutes: UC2843BDR2G and UC2843BDG

The UC2843BDR2G and UC2843BDG are manufacturer-recommended alternatives from onsemi. Both parts maintain the 14-SOIC package form factor and support identical voltage supply range (7.6V ~ 30V) and switching frequency (up to 500kHz). Key differences include:

• Duty cycle maximum: 96% versus 97% for the TL2843DRE4
• Operating temperature range: -25°C ~ 85°C versus -40°C ~ 85°C for the TL2843DRE4
• Topology support: Boost and Flyback only (Forward topology not supported)
• Output configuration: Positive with Isolation Capable option

The UC2843BDR2G is currently active and supplied in Tape & Reel format, providing better availability than UC2843BDG, which is obsolete. These alternatives are suitable for applications that do not require Forward topology operation or extended low-temperature performance below -25°C.

All substitute parts maintain ROHS3 compliance, MSL rating of 1 (Unlimited), and surface mount compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can TL2843DR be used as a direct replacement for TL2843DRE4?

A: Yes. The TL2843DR is a parametric equivalent with identical electrical specifications. The only difference is packaging format (Tape & Reel versus tube). Both parts are pin-compatible in 14-SOIC packages and support the same voltage range, switching frequency, and operating temperature. TL2843DR is recommended for new production due to active product status.

Q: What are the key differences between TL2843DRE4 and UC2843BDR2G?

A: The primary differences are: (1) duty cycle maximum is 96% for UC2843BDR2G versus 97% for TL2843DRE4; (2) operating temperature range is -25°C ~ 85°C versus -40°C ~ 85°C; (3) topology support is limited to Boost and Flyback for UC2843BDR2G, excluding Forward topology. Both maintain identical voltage supply range (7.6V ~ 30V) and switching frequency (up to 500kHz). UC2843BDR2G is suitable for applications not requiring Forward topology or extended low-temperature operation.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (TL2843DR, UC2843BDG, UC2843BDR2G) are ROHS3 compliant with MSL rating of 1 (Unlimited), matching the compliance profile of the TL2843DRE4.

Q: What is the difference between UC2843BDG and UC2843BDR2G?

A: Both parts are functionally identical with the same electrical specifications. The difference is packaging format: UC2843BDG is supplied in tube packaging, while UC2843BDR2G is supplied in Tape & Reel (TR) format. UC2843BDR2G has active product status, whereas UC2843BDG is obsolete. UC2843BDR2G is recommended for new designs.

Q: Can I use UC2843BDR2G in an application requiring Forward topology?

A: No. UC2843BDR2G supports only Boost and Flyback topologies. The TL2843DRE4 and TL2843DR support Boost, Flyback, and Forward topologies. If Forward topology is required, use TL2843DR as the substitute.

Q: Are there temperature range limitations when substituting with onsemi parts?

A: Yes. UC2843BDG and UC2843BDR2G operate over -25°C ~ 85°C, whereas TL2843DRE4 operates over -40°C ~ 85°C. If your application requires operation below -25°C, use TL2843DR instead.