TL3843BDR Equivalent & Substitute Parts

Part Overview

The TL3843BDR is a Power Management IC (PMIC) manufactured by Texas Instruments, functioning as a multi-topology DC-DC controller for boost, flyback, and forward regulator applications. This device operates as a transistor driver with positive output configuration and supports step-up and step-up/step-down topologies. The part is currently active in production with 18,200 units in stock. Substitute parts are necessary when the Cut Tape packaging is unavailable, when alternative manufacturers are preferred for supply chain diversification, or when specific operating temperature ranges or automotive qualifications are required for application-specific designs.

Substiute Parts

TL3843BDR

Texas InstrumentsIn Stock: 18257TL3843BDR Datasheet

Current PartRFQ

TL3843DR

Texas InstrumentsIn Stock: 19416TL3843DR Datasheet

Parametric EquivalentRFQ

NCV3843BVDR2G

onsemiIn Stock: 15779NCV3843BVDR2G Datasheet

MFR RecommendedRFQ

UC3843BDG

onsemiIn Stock: 3137UC3843BDG Datasheet

MFR RecommendedRFQ

UC3843BDR2G

onsemiIn Stock: 3564UC3843BDR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TL3843BDR is determined by strict parametric matching across the following criteria:

Core Electrical Parameters (Must Match):

• Voltage Supply Range: 7.6V ~ 30V
• Package Type: 14-SOIC form factor
• Output Type: Transistor Driver
• Mounting Type: Surface Mount
• RoHS Compliance: ROHS3 Compliant

Topology & Function Compatibility: Substitutes must support at least one of the following topologies: Boost, Flyback, or Forward. Substitutes must support at least one of the following functions: Step-Up or Step-Up/Step-Down.

Acceptable Variations:

• Switching Frequency: Up to 500kHz (equal or lower)
• Duty Cycle: 96% or higher
• Operating Temperature: May extend beyond 0°C ~ 70°C range
• Packaging Format: Cut Tape (CT), Tape & Reel (TR), or Tube acceptable
• Manufacturer: Texas Instruments or onsemi

Non-Substitutable Parameters:

• Package case dimensions and pin count must remain 14-SOIC
• Surface mount requirement is mandatory
• ROHS3 compliance is mandatory

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute - TL3843DR (Texas Instruments): The TL3843DR is the direct parametric equivalent to the TL3843BDR, differing only in packaging format (Tape & Reel versus Cut Tape). Both are manufactured by Texas Instruments, maintain identical electrical specifications, and carry Active product status. Selection of TL3843DR is appropriate when Tape & Reel packaging meets application requirements and offers superior inventory availability (19,350 units).

Secondary Substitute - NCV3843BVDR2G (onsemi): The NCV3843BVDR2G is manufactured by onsemi and meets all core electrical parameters. This part extends the operating temperature range to -40°C ~ 125°C and carries AEC-Q100 automotive qualification, making it suitable for automotive and extended-temperature applications. Topology support is limited to Flyback, which may restrict application flexibility compared to the main part. Product status is Active with 15,722 units in stock.

Tertiary Substitute - UC3843BDR2G (onsemi): The UC3843BDR2G is an onsemi alternative in Tape & Reel packaging with Active product status and 3,500 units available. Electrical parameters match the main part across voltage supply, switching frequency, and duty cycle. Topology support includes Boost and Flyback, excluding Forward topology. Operating temperature remains 0°C ~ 70°C.

Not Recommended - UC3843BDG (onsemi): The UC3843BDG carries Obsolete product status and is not recommended for new designs or long-term supply chain planning. Although electrical parameters are compatible, the obsolete classification indicates discontinued manufacturing and limited future availability (3,110 units).

Frequently Asked Questions (FAQ)

Q: Can I substitute TL3843DR for TL3843BDR without circuit modification?

A: Yes. The TL3843DR is a direct parametric equivalent differing only in packaging format (Tape & Reel versus Cut Tape). Both parts are manufactured by Texas Instruments with identical electrical specifications, pin configuration, and functional characteristics. No circuit modification is required.

Q: What is the key difference between TL3843BDR and NCV3843BVDR2G?

A: The primary differences are manufacturer (Texas Instruments versus onsemi), operating temperature range (0°C ~ 70°C versus -40°C ~ 125°C), and supported topologies (Boost/Flyback/Forward versus Flyback only). The NCV3843BVDR2G includes AEC-Q100 automotive qualification, making it suitable for automotive applications requiring extended temperature operation.

Q: Why is UC3843BDG not recommended as a substitute?

A: The UC3843BDG carries Obsolete product status, indicating discontinued manufacturing. While electrical parameters are compatible, obsolete parts present supply chain risk and are unsuitable for new designs or applications requiring long-term component availability.

Q: Are all substitute parts available in 14-SOIC package?

A: Yes. All substitute parts listed maintain the 14-SOIC (0.154", 3.90mm Width) package form factor, ensuring pin-compatible replacement in existing PCB layouts.

Q: What packaging options are available across substitute parts?

A: Packaging options include Cut Tape (CT), Tape & Reel (TR), and Tube formats. TL3843BDR and NCV3843BVDR2G are available in Cut Tape. TL3843DR and UC3843BDR2G are available in Tape & Reel. UC3843BDG is available in Tube format. Selection depends on assembly process requirements and volume specifications.

Q: Do all substitute parts meet RoHS compliance requirements?

A: Yes. All substitute parts listed carry ROHS3 Compliant status, meeting environmental and regulatory requirements equivalent to the main part.

Q: Can NCV3843BVDR2G be used in non-automotive applications?

A: Yes. The NCV3843BVDR2G meets all core electrical parameters required for standard boost, flyback, and forward converter applications. The automotive qualification and extended temperature range are additional capabilities that do not restrict use in non-automotive designs.