AP3154AFG-7 Equivalent & Substitute Parts

Part Overview

The AP3154AFG-7 is a LED Driver IC with integrated 4-output DC-DC regulator utilizing switched capacitor (charge pump) topology for PWM dimming applications. Manufactured by Diodes Incorporated, this component is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements. The part operates across a 2.7V to 5.5V supply range with 30mA per-channel output capability, packaged in a 12-pin ultra-fine pitch DFN format.

Substiute Parts

AP3154AFG-7

Diodes IncorporatedIn Stock: 2043AP3154AFG-7 Datasheet

Current PartRFQ

AL3157F-7

Diodes IncorporatedIn Stock: 1843AL3157F-7 Datasheet

MFR RecommendedRFQ

ADM8843ACPZ-REEL7

Analog Devices Inc.In Stock: 10605ADM8843ACPZ-REEL7 Datasheet

MFR RecommendedRFQ

LM2794TL/NOPB

Texas InstrumentsIn Stock: 3104LM2794TL/NOPB Datasheet

MFR RecommendedRFQ

LP8553TLX/NOPB

Texas InstrumentsIn Stock: 683LP8553TLX/NOPB Datasheet

MFR RecommendedRFQ

MAX1573ETE+T

Analog Devices Inc./Maxim IntegratedIn Stock: 5431MAX1573ETE+T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AP3154AFG-7 is determined by the following critical parameters:

Primary Substitution Criteria:

• Topology: Switched Capacitor (Charge Pump)
• Number of Outputs: 4
• Supply Voltage Range: Minimum 2.7V, Maximum 5.5V
• Dimming Method: PWM
• Internal Switch(s): Yes
• Mounting Type: Surface Mount
• RoHS3 Compliance

Secondary Compatibility Factors:

• Current Output per Channel: 28mA to 30mA (tight tolerance)
• Operating Temperature Range: -40°C to 85°C minimum
• Package compatibility: DFN or equivalent ultra-fine pitch packages

Substitute parts are grouped into two categories based on topology alignment and electrical performance:

Group 1 - Direct Topology Match (Switched Capacitor): AL3157F-7, MAX1573ETE+T, ADM8843ACPZ-REEL7

Group 2 - Alternative Topology (Step-Up Boost): LP8553TLX/NOPB, LM2794TL/NOPB

Parts in Group 1 maintain identical switched capacitor topology and are preferred for direct replacement scenarios. Parts in Group 2 employ alternative topologies and require circuit-level evaluation for compatibility.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred):

AL3157F-7 is the primary substitute candidate. Both parts share identical topology (switched capacitor), 4-output configuration, matching supply voltage range (2.7V–5.5V), and PWM dimming capability. AL3157F-7 maintains the same 12-pin UFDFN package footprint and offers MSL-1 moisture sensitivity rating. Although AL3157F-7 is also classified as obsolete, it provides the highest electrical and mechanical compatibility. Current output per channel ranges from 30mA to 210mA, accommodating the AP3154AFG-7 specification of 30mA.

MAX1573ETE+T is an active-status alternative with switched capacitor topology, 4 outputs, and matching supply voltage range. The 28mA per-channel output closely aligns with the 30mA specification. Package transition to 16-TQFN (4x4) requires PCB layout modification. MSL-1 rating and ROHS3 compliance are maintained.

For Extended Supply Voltage Applications:

LP8553TLX/NOPB employs step-up (boost) topology with significantly higher current capability (450mA per channel) and extended supply voltage range (2.7V–22V). This part is suitable only for applications requiring higher output current or elevated supply voltages. Circuit topology differences necessitate design-level evaluation.

For Temperature-Constrained Environments:

LM2794TL/NOPB and LP8553TLX/NOPB operate across -30°C to 85°C, which is narrower than the AP3154AFG-7 specification of -40°C to 85°C. These parts are unsuitable for applications requiring full -40°C operation.

Compliance Considerations:

All substitute candidates maintain ROHS3 compliance and EAR99 export classification. ADM8843ACPZ-REEL7 carries MSL-3 (168 hours) moisture sensitivity, requiring controlled storage conditions compared to MSL-1 alternatives.

Frequently Asked Questions (FAQ)

Q: Can AL3157F-7 be used as a direct drop-in replacement for AP3154AFG-7?

A: AL3157F-7 is electrically and mechanically compatible with AP3154AFG-7. Both use 12-pin UFDFN packaging, switched capacitor topology, 4-output configuration, and identical supply voltage range (2.7V–5.5V). The 30mA per-channel output specification is met. PCB layout and component placement remain unchanged. However, AL3157F-7 is also obsolete; long-term availability should be confirmed with suppliers.

Q: What is the primary difference between Group 1 and Group 2 substitutes?

A: Group 1 substitutes (AL3157F-7, MAX1573ETE+T, ADM8843ACPZ-REEL7) maintain switched capacitor topology identical to AP3154AFG-7. Group 2 substitutes (LP8553TLX/NOPB, LM2794TL/NOPB) employ alternative topologies (step-up boost or different charge pump configurations). Group 1 parts require minimal circuit modification; Group 2 parts require full design evaluation.

Q: Does package size difference affect substitutability?

A: Package differences require PCB layout redesign. AL3157F-7 maintains the 12-pin UFDFN footprint, enabling direct PCB reuse. MAX1573ETE+T (16-TQFN), ADM8843ACPZ-REEL7 (16-VFQFN), LM2794TL/NOPB (14-DSBGA), and LP8553TLX/NOPB (25-DSBGA) require new PCB layouts and routing modifications.

Q: Are all substitutes suitable for -40°C operation?

A: AL3157F-7, AP3154AFG-7, MAX1573ETE+T, and ADM8843ACPZ-REEL7 operate across -40°C to 85°C. LM2794TL/NOPB and LP8553TLX/NOPB operate across -30°C to 85°C only. For applications requiring -40°C operation, use only the first group.

Q: What does MSL-3 (168 hours) mean for ADM8843ACPZ-REEL7?

A: MSL-3 indicates the component must be used within 168 hours of package opening under controlled humidity conditions (typically ≤30% RH at 25°C). MSL-1 components (all other substitutes) have unlimited shelf life after opening. ADM8843ACPZ-REEL7 requires stricter moisture control during assembly and storage.

Q: Can LP8553TLX/NOPB replace AP3154AFG-7 in existing designs?

A: LP8553TLX/NOPB is not recommended for direct replacement. It employs step-up (boost) topology versus switched capacitor, supports supply voltages up to 22V (versus 5.5V maximum), and delivers 450mA per channel (versus 30mA). These differences require complete circuit redesign and are suitable only for applications with fundamentally different power requirements.

Q: Which substitute offers the best long-term availability?

A: ADM8843ACPZ-REEL7, MAX1573ETE+T, LM2794TL/NOPB, and LP8553TLX/NOPB are all active-status products with established supply chains. AL3157F-7 is obsolete, similar to AP3154AFG-7. For new designs, prioritize active-status alternatives.