LM4922TL/NOPB Equivalent & Substitute Parts

Part Overview

The LM4922TL/NOPB is a Class AB stereo headphone amplifier IC manufactured by Texas Instruments, part of the Boomer® series. This device delivers 80mW output power per channel at 16Ω load across two stereo channels in a 14-DSBGA surface mount package. The LM4922TL/NOPB is classified as obsolete product status, making identification of equivalent and substitute components necessary for ongoing design support, production continuity, and system maintenance. Substitute parts must maintain functional compatibility while meeting the same electrical performance envelope and mechanical constraints.

Key Parameters

Parameter	Value
Amplifier Type	Class AB
Output Configuration	Headphones, 2-Channel (Stereo)
Max Output Power	80mW x 1 @ 16Ω
Supply Voltage Range	1.6V ~ 4.2V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package Type	14-DSBGA (1.96x1.96)
Key Features	Depop, Differential Inputs, Shutdown, Standby, Thermal Protection
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LM4922TL/NOPB are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Electrical Compatibility Criteria:

Amplifier topology: Class AB configuration
Output stage: 2-Channel (Stereo) headphone amplifier
Output power capability: minimum 80mW per channel at 16Ω load
Supply voltage range: must encompass or exceed 1.6V ~ 4.2V operating window
Operating temperature range: -40°C ~ 85°C
Protection features: thermal protection and shutdown capability

Mechanical Compatibility Criteria:

Surface mount technology
Package footprint compatibility with 14-pin BGA variants
Moisture sensitivity level: MSL 1 (Unlimited)

Regulatory Compliance:

RoHS3 compliance required
REACH unaffected status

Two substitute parts meet these criteria: the LM48820TM/NOPB (Texas Instruments, same manufacturer) and the BD88215GUL-E2 (Rohm Semiconductor, alternative manufacturer).

Parameter Comparison

Parameter	LM4922TL/NOPB (Main)	LM48820TM/NOPB (Substitute)	BD88215GUL-E2 (Substitute)
Manufacturer	Texas Instruments	Texas Instruments	Rohm Semiconductor
Amplifier Type	Class AB	Class AB	Class AB
Output Configuration	Headphones, 2-Channel (Stereo)	Headphones, 2-Channel (Stereo)	2-Channel (Stereo)
Max Output Power @ 16Ω	80mW x 1	95mW x 2	80mW x 2
Supply Voltage Range	1.6V ~ 4.2V	1.6V ~ 4.5V	2.4V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package Type	14-DSBGA (1.96x1.96)	14-DSBGA	VCSP50L2 (14-UFBGA)
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Thermal Protection	Yes	Yes	Yes
Shutdown Feature	Yes	Yes	No

Engineering Selection Recommendations

LM48820TM/NOPB (Texas Instruments - Recommended Primary Substitute)

The LM48820TM/NOPB is the manufacturer-recommended substitute for the LM4922TL/NOPB. Both devices are from the Texas Instruments Boomer® series and share identical operating temperature ranges (-40°C ~ 85°C). The LM48820TM/NOPB maintains active product status, ensuring long-term availability and supply chain continuity. Output power capability is enhanced at 95mW x 2 @ 16Ω, exceeding the original specification. Supply voltage range extends to 4.5V, providing broader operational flexibility. The 14-DSBGA package maintains mechanical compatibility. Both parts are ROHS3 compliant with identical regulatory status. This substitute is suitable for direct replacement in applications where the enhanced output power and extended supply voltage range do not create design conflicts.

BD88215GUL-E2 (Rohm Semiconductor - Alternative Substitute)

The BD88215GUL-E2 provides an alternative from a different manufacturer (Rohm Semiconductor) with active product status. Output power matches the original specification at 80mW x 2 @ 16Ω. The extended supply voltage range (2.4V ~ 5.5V) accommodates broader system designs. Operating temperature range is identical (-40°C ~ 85°C). ROHS3 compliance is maintained. The VCSP50L2 package (14-UFBGA) differs from the original 14-DSBGA footprint, requiring PCB layout verification and potential redesign of the component placement area. The absence of a dedicated shutdown feature compared to the original part may impact power management in battery-powered applications. This substitute is applicable when package footprint redesign is acceptable and shutdown functionality is not critical.

Frequently Asked Questions (FAQ)

Q: Can the LM48820TM/NOPB directly replace the LM4922TL/NOPB without PCB modifications?

A: The LM48820TM/NOPB uses the same 14-DSBGA package as the LM4922TL/NOPB, enabling direct footprint compatibility. No PCB layout modifications are required for component placement. However, circuit design review is recommended to confirm that the enhanced output power specification (95mW x 2 versus 80mW x 1) does not introduce thermal or signal integrity issues in the target application.

Q: What are the key differences in supply voltage requirements between the three parts?

A: The LM4922TL/NOPB operates from 1.6V to 4.2V. The LM48820TM/NOPB extends the upper limit to 4.5V, providing 0.3V additional headroom. The BD88215GUL-E2 requires a minimum of 2.4V, which is 0.8V higher than the original part, and supports up to 5.5V. Systems designed for the original 1.6V minimum supply voltage cannot use the BD88215GUL-E2 without power supply redesign.

Q: Is the BD88215GUL-E2 package compatible with the original LM4922TL/NOPB PCB layout?

A: No. The BD88215GUL-E2 uses a VCSP50L2 package (14-UFBGA), which differs from the original 14-DSBGA (1.96x1.96) footprint. PCB layout redesign is necessary, including via placement, trace routing, and component placement area modifications. Package datasheet comparison is required before implementation.

Q: Which substitute part is recommended for battery-powered headphone applications?

A: The LM48820TM/NOPB is recommended for battery-powered applications. It maintains the shutdown feature of the original LM4922TL/NOPB, enabling power management and extended battery life. The BD88215GUL-E2 lacks a dedicated shutdown function, limiting power control options in low-power designs.

Q: Are all three parts RoHS3 compliant?

A: Yes. The LM4922TL/NOPB, LM48820TM/NOPB, and BD88215GUL-E2 are all ROHS3 compliant with REACH unaffected status, meeting current environmental and regulatory requirements.

Q: What is the impact of the LM4922TL/NOPB obsolete status on design decisions?

A: The obsolete status indicates that Texas Instruments has discontinued this part. Existing inventory may be available through authorized distributors, but long-term supply cannot be guaranteed. Migration to an active substitute (LM48820TM/NOPB or BD88215GUL-E2) is recommended for new designs or production continuity planning.

Q: Can the LM48820TM/NOPB be used in applications originally designed for 80mW output power?

A: Yes. The LM48820TM/NOPB delivers 95mW x 2 @ 16Ω, which exceeds the original 80mW specification. Applications designed for 80mW operation will function correctly with the higher output power. Thermal design review is recommended to ensure that increased power dissipation does not exceed PCB thermal capacity or create acoustic distortion in headphone applications.

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