PAM2861ABR-B LED Driver IC Equivalent & Substitute Parts

Part Overview

The PAM2861ABR-B is a LED Driver IC manufactured by Diodes Incorporated, designed for step-down (buck) DC-DC regulation with PWM dimming capability. This component integrates a single output regulator with internal switching capability, delivering up to 1A output current across a 6V to 40V supply range. The device is classified as obsolete, which necessitates identification of active equivalent alternatives for new designs and ongoing production requirements.

The PAM2861ABR-B is primarily applied in backlight and lighting applications where efficient power conversion and PWM-based brightness control are required. The obsolete status of this part number requires engineers to transition to functionally equivalent active alternatives to ensure supply chain continuity and long-term component availability.

Substiute Parts

PAM2861ABR-B

Diodes IncorporatedIn Stock: 721PAM2861ABR-B Datasheet

Current PartRFQ

PAM2861ABR

Diodes IncorporatedIn Stock: 20271PAM2861ABR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PAM2861ABR-B is determined by strict equivalence across the following critical parameters:

Topology & Functional Requirements:

• Step-down (buck) DC-DC regulator topology
• Single output configuration
• Internal integrated switching element
• 1A output current capability

Electrical Specifications:

• Input voltage range: 6V to 40V minimum and maximum
• Switching frequency range: 233kHz to 1MHz
• PWM dimming control capability
• Operating temperature range: -40°C to 85°C

Physical & Manufacturing Requirements:

• SOT-23-5 Thin package (TSOT-23-5)
• Surface mount technology
• ROHS3 compliance

Supply Chain Considerations:

• Active product status for long-term availability
• Manufacturer: Diodes Incorporated (same manufacturer preferred for consistency)

The PAM2861ABR (without the "-B" suffix) qualifies as a direct substitute based on identical electrical specifications, package type, and manufacturer. The primary distinction is product status transition from obsolete to active, ensuring continued component availability and manufacturing support.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: PAM2861ABR

The PAM2861ABR is the direct functional equivalent of the PAM2861ABR-B. Both components share identical electrical specifications, package configuration, and thermal operating range. The transition from PAM2861ABR-B (obsolete) to PAM2861ABR (active) represents a standard product lifecycle update within the same manufacturer's portfolio.

Compliance & Regulatory Status:

Both the main part and substitute maintain ROHS3 compliance, satisfying environmental and hazardous substance restrictions. The PAM2861ABR provides additional regulatory documentation through REACH Unaffected status and defined Moisture Sensitivity Level (MSL 1), indicating superior supply chain traceability and handling specifications.

Packaging & Availability:

The PAM2861ABR is supplied in Tape & Reel (TR) packaging format with significantly higher inventory availability (20,200 pieces in stock versus 692 pieces for the obsolete variant). This availability differential directly supports production continuity and reduces procurement lead times.

Dimming Capability Enhancement:

The PAM2861ABR supports both analog and PWM dimming control, compared to PWM-only dimming in the PAM2861ABR-B. This expanded dimming functionality provides additional design flexibility for lighting applications without requiring alternative component selection.

Design Integration:

Pin-for-pin compatibility, identical electrical performance across the specified voltage and current ranges, and matching thermal characteristics ensure direct substitution without circuit redesign or PCB layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the PAM2861ABR directly replace the PAM2861ABR-B in existing designs?

A: Yes. The PAM2861ABR is electrically and mechanically identical to the PAM2861ABR-B. Both components feature the same SOT-23-5 Thin package, identical pin configuration, and matching electrical specifications across all operating parameters. Direct substitution requires no circuit modifications or PCB layout changes.

Q: What is the significance of the "-B" suffix in the part number?

A: The "-B" suffix typically indicates a specific manufacturing revision or packaging variant within a product family. The PAM2861ABR represents the current active production version, while PAM2861ABR-B is classified as obsolete. The electrical and functional specifications remain equivalent between these variants.

Q: Are there any differences in dimming control between the two parts?

A: The PAM2861ABR-B supports PWM dimming only. The PAM2861ABR supports both analog and PWM dimming control. This represents an enhancement in the active variant, providing additional design flexibility without compromising backward compatibility with PWM-only applications.

Q: What packaging formats are available for the PAM2861ABR?

A: The PAM2861ABR is supplied in Tape & Reel (TR) packaging, which is the standard format for automated assembly processes. Both the main part and substitute use the SOT-23-5 Thin (TSOT-23-5) package type, ensuring compatibility with standard surface mount assembly equipment.

Q: How does the Moisture Sensitivity Level (MSL) affect component handling?

A: The PAM2861ABR carries an MSL rating of 1 (Unlimited), indicating that the component has no moisture sensitivity restrictions. This classification simplifies storage, handling, and assembly procedures compared to higher MSL ratings, which require controlled humidity environments and bake-out procedures before soldering.

Q: Are both parts ROHS3 compliant?

A: Yes. Both the PAM2861ABR-B and PAM2861ABR maintain full ROHS3 compliance, confirming the absence of restricted hazardous substances including lead, cadmium, mercury, hexavalent chromium, and specified brominated flame retardants.

Q: What is the REACH status of the PAM2861ABR?

A: The PAM2861ABR carries REACH Unaffected status, indicating that the component does not contain substances of very high concern (SVHC) listed under the REACH regulation. This status simplifies regulatory documentation and supply chain compliance requirements.

Q: Can the PAM2861ABR be used in new product designs?

A: Yes. The PAM2861ABR is classified as an active product with full manufacturer support. It is suitable for new designs, production ramps, and long-term manufacturing programs. The active status ensures continued availability, technical support, and manufacturing consistency.