TL2843BDR Equivalent & Substitute Parts

Part Overview

The TL2843BDR is a Power Management IC (PMIC) manufactured by Texas Instruments, functioning as a boost, flyback, and forward regulator controller with positive output configuration. This device operates as a step-up and step-up/step-down DC-DC controller in 14-SOIC surface mount packaging. The part is currently active in production with 19,764 units in stock. Substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required, or when design flexibility across compatible topologies is needed.

Substiute Parts

TL2843BDR

Texas InstrumentsIn Stock: 19801TL2843BDR 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

Substitute parts for the TL2843BDR are qualified based on the following criteria:

Electrical Parameters (Must Match):

• Voltage supply range: 7.6V ~ 30V
• Switching frequency capability: Up to 500kHz
• Output type: Transistor Driver
• Output configuration: Positive
• Package type: 14-SOIC surface mount

Allowable Variations:

• Duty cycle maximum (96% to 97%)
• Operating temperature range (minimum -40°C or -25°C acceptable)
• Topology subset (Boost, Flyback acceptable; Forward optional)
• Packaging format (bulk or Tape & Reel)
• Product status (Active or Obsolete acceptable for legacy designs)

Substitution Categories:

1. Parametric Equivalent: Identical electrical specifications with different packaging format
2. Manufacturer Recommended: Cross-manufacturer equivalent with compatible topology and electrical performance

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (TL2843BDR): Select the original TL2843BDR when bulk packaging is acceptable and Texas Instruments sourcing is preferred. This part maintains the widest operating temperature range (-40°C to 85°C) and supports forward topology in addition to boost and flyback configurations.

Parametric Equivalent (TL2843DR): The TL2843DR is a direct parametric equivalent differing only in packaging format (Tape & Reel). Select this part when automated assembly processes require reel packaging. The duty cycle maximum increases to 97%, providing marginal performance improvement. Both parts are manufactured by Texas Instruments and maintain identical electrical specifications.

Cross-Manufacturer Alternatives (UC2843BDG / UC2843BDR2G): The UC2843BDG and UC2843BDR2G are onsemi equivalents suitable when cross-manufacturer sourcing is required. Both parts maintain identical supply voltage, switching frequency, and output type specifications. Key differences include:

• Operating temperature minimum of -25°C (versus -40°C for TL2843 series)
• Topology limited to Boost and Flyback (Forward topology not supported)
• Enhanced isolation capability in output configuration
• UC2843BDG is obsolete; UC2843BDR2G is active in production

Select UC2843BDR2G for new designs requiring onsemi sourcing. The UC2843BDG is acceptable only for legacy system maintenance where part continuity is established.

Compliance Considerations: All substitute parts maintain ROHS3 compliance, unlimited moisture sensitivity level (MSL 1), and identical ECCN/HTSUS classifications, ensuring regulatory equivalence across all options.

Frequently Asked Questions (FAQ)

Q: Can TL2843BDR be directly replaced with TL2843DR? A: Yes. Both parts are Texas Instruments products with identical electrical specifications. The only difference is packaging format: TL2843BDR is supplied in bulk, while TL2843DR is supplied in Tape & Reel format. Pin configuration and functional performance are identical.

Q: Are UC2843BDG and UC2843BDR2G compatible with TL2843BDR? A: Both onsemi parts are functionally compatible for boost and flyback topologies. However, they do not support forward topology and have a reduced operating temperature minimum of -25°C instead of -40°C. Verify your application does not require forward topology operation or extended low-temperature performance before substituting.

Q: What is the difference between UC2843BDG and UC2843BDR2G? A: Both parts are electrically identical. UC2843BDG is obsolete, while UC2843BDR2G is active in production. For new designs, select UC2843BDR2G. The UC2843BDG is only recommended for legacy system repairs where part continuity is required.

Q: Does packaging format affect electrical performance? A: No. Bulk and Tape & Reel packaging formats contain identical die and electrical specifications. Packaging selection is driven by assembly process requirements and inventory management, not performance.

Q: Can I use these parts interchangeably in my PCB design? A: Yes, provided your design does not require forward topology operation or operating temperatures below -25°C. All substitute parts use identical 14-SOIC pinout and electrical interface. Verify your application requirements against the operating temperature and topology specifications before final part selection.

Q: What is the significance of the duty cycle difference (96% vs 97%)? A: The duty cycle maximum represents the maximum on-time ratio of the switching cycle. TL2843DR supports 97% maximum duty cycle compared to 96% for TL2843BDR. This marginal difference has negligible impact on most applications and does not affect substitution compatibility.

Q: Are all substitute parts RoHS compliant? A: Yes. All parts listed (TL2843BDR, TL2843DR, UC2843BDG, UC2843BDR2G) are ROHS3 compliant with identical environmental and regulatory certifications.