LM4894MM/NOPB Equivalent & Substitute Parts

Part Overview

The LM4894MM/NOPB is a Class AB mono audio amplifier IC manufactured by Texas Instruments, part of the Boomer® series. This device delivers 1.4W output power at 4Ω load with integrated depop, differential inputs, shutdown, and thermal protection features. The part operates across a 2.2V to 5.5V supply range and is housed in a 10-VSSOP package.

The LM4894MM/NOPB carries an Obsolete product status. Substitute parts are necessary to ensure design continuity, maintain supply chain reliability, and support long-term production requirements. Active alternatives with equivalent or comparable electrical and mechanical specifications are available from Texas Instruments and Analog Devices Inc./Maxim Integrated.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Linear, Amplifiers
Type	Class AB
Output Type	1-Channel (Mono)
Max Output Power @ 4Ω	1.4W x 1
Voltage - Supply	2.2V ~ 5.5V
Features	Depop, Differential Inputs, Shutdown, Thermal Protection
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Primary Compatibility Criteria:

Class AB amplifier topology
1-Channel (Mono) output configuration
1.4W output power at 4Ω load (or equivalent load impedance performance)
Supply voltage range compatibility (minimum 2.2V to 5.5V overlap)
Depop, Differential Inputs, Shutdown, and Thermal Protection features
Surface mount technology
Operating temperature range: -40°C to 85°C
RoHS3 compliance
ECCN EAR99 classification

Package Considerations: Substitutes may utilize different package types (10-VSSOP, 10-uMAX-EP, 8-WQFN) provided the physical footprint and pin configuration support direct or adapter-based integration into existing PCB designs.

Supply Voltage Variance: The LM4894MM/NOPB operates from 2.2V minimum. Substitute parts with 2.4V or 2.7V minimum specifications remain compatible in applications where the supply voltage exceeds these thresholds.

Output Power Variance: The LM4923LQ/NOPB delivers 1.1W at 8Ω load, representing a lower power output. This part is suitable for applications where the load impedance is 8Ω or higher, or where reduced output power is acceptable.

Parameter Comparison

Parameter	LM4894MM/NOPB	LM4898MM/NOPB	LM4923LQ/NOPB	MAX9718AEUB+	MAX9718AEUB+T	MAX9718DEUB+	MAX9718DEUB+T
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim
Type	Class AB	Class AB	Class AB	Class AB	Class AB	Class AB	Class AB
Output Type	1-Channel (Mono)	1-Channel (Mono)	1-Channel (Mono)	1-Channel (Mono)	1-Channel (Mono)	1-Channel (Mono)	1-Channel (Mono)
Max Output Power	1.4W @ 4Ω	1.4W @ 4Ω	1.1W @ 8Ω	1.4W @ 4Ω	1.4W @ 4Ω	1.4W @ 4Ω	1.4W @ 4Ω
Voltage - Supply	2.2V ~ 5.5V	2.4V ~ 5.5V	2.4V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V
Features	Depop, Differential Inputs, Shutdown, Thermal Protection	Depop, Differential Inputs, Shutdown, Thermal Protection	Depop, Differential Inputs, Shutdown, Thermal Protection	Depop, Differential Inputs, Shutdown, Thermal Protection	Depop, Differential Inputs, Shutdown, Thermal Protection	Depop, Differential Inputs, Shutdown, Thermal Protection	Depop, Differential Inputs, Shutdown, Thermal Protection
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	10-TFSOP, 10-MSOP	10-TFSOP, 10-MSOP	8-WQFN Exposed Pad	10-TFSOP, 10-MSOP Exposed Pad	10-TFSOP, 10-MSOP Exposed Pad	10-TFSOP, 10-MSOP Exposed Pad	10-TFSOP, 10-MSOP Exposed Pad
Supplier Device Package	10-VSSOP	10-VSSOP	8-WQFN (2x2)	10-uMAX-EP	10-uMAX-EP	10-uMAX-EP	10-uMAX-EP
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Primary Recommendation: LM4898MM/NOPB

The LM4898MM/NOPB is the direct Texas Instruments successor to the LM4894MM/NOPB. Both devices share identical electrical specifications (1.4W @ 4Ω, Class AB mono topology, feature set), package type (10-VSSOP), and operating temperature range. The LM4898MM/NOPB carries Active product status with 2184 units in stock. The only variance is the minimum supply voltage (2.4V vs. 2.2V), which is compatible with applications operating above 2.4V. This part is the preferred substitute for direct replacement in existing designs.

Secondary Recommendation: MAX9718AEUB+T or MAX9718DEUB+T

The MAX9718 series (Analog Devices Inc./Maxim Integrated) delivers equivalent 1.4W @ 4Ω output power with identical feature sets and operating temperature range. These parts are available in Tape & Reel packaging with high inventory (6400 and 3668 units respectively). The 10-uMAX-EP package is physically compatible with 10-TFSOP/10-MSOP footprints. Minimum supply voltage is 2.7V. Both variants (AEUB+T and DEUB+T) are Active products suitable for new designs and production continuity.

Alternative Recommendation: LM4923LQ/NOPB

The LM4923LQ/NOPB is suitable for applications where the load impedance is 8Ω or higher. This part delivers 1.1W @ 8Ω and uses an 8-WQFN (2x2) package, requiring PCB layout modification. The LM4923LQ/NOPB is Active with 3456 units in stock. MSL rating is 3 (168 Hours), requiring controlled storage conditions. This substitute is appropriate only when load impedance and PCB redesign constraints are acceptable.

Compliance and Certification:

All substitute parts maintain ROHS3 compliance, REACH Unaffected status, and EAR99 ECCN classification, matching the original LM4894MM/NOPB specifications. All parts are suitable for applications requiring regulatory compliance in consumer, industrial, and automotive segments.

Frequently Asked Questions (FAQ)

Q1: Can the LM4898MM/NOPB directly replace the LM4894MM/NOPB without PCB modification?

A: Yes. The LM4898MM/NOPB uses the identical 10-VSSOP package and pin configuration as the LM4894MM/NOPB. No PCB layout changes are required. The only design consideration is verifying that the application supply voltage exceeds 2.4V (the LM4898MM/NOPB minimum specification versus 2.2V for the LM4894MM/NOPB).

Q2: What is the difference between MAX9718AEUB+T and MAX9718DEUB+T?

A: Both parts are electrically identical Class AB mono amplifiers with 1.4W @ 4Ω output power. The suffix designates temperature grade or internal configuration variants. Both are Active products with equivalent performance and feature sets. Selection between these variants depends on inventory availability and procurement lead times.

Q3: Why does the LM4923LQ/NOPB have lower output power (1.1W @ 8Ω)?

A: The LM4923LQ/NOPB is specified at 8Ω load impedance, whereas the LM4894MM/NOPB is specified at 4Ω. Output power scales inversely with load impedance in Class AB amplifiers. The LM4923LQ/NOPB is suitable only for applications with 8Ω or higher load impedance, or where reduced output power is acceptable.

Q4: Can I use the MAX9718 series in applications requiring 2.2V minimum supply voltage?

A: No. The MAX9718 series specifies a 2.7V minimum supply voltage, whereas the LM4894MM/NOPB operates from 2.2V. If your application requires operation below 2.7V, use the LM4898MM/NOPB (2.4V minimum) or the original LM4894MM/NOPB. The LM4898MM/NOPB is the preferred alternative for low-voltage applications above 2.4V.

Q5: What packaging considerations apply to the LM4923LQ/NOPB?

A: The LM4923LQ/NOPB uses an 8-WQFN (2x2) package with exposed pad, differing from the 10-VSSOP package of the LM4894MM/NOPB. PCB footprint redesign is required. Additionally, the LM4923LQ/NOPB carries MSL 3 (168 Hours) moisture sensitivity, requiring controlled storage and handling procedures. The 10-VSSOP alternatives (LM4898MM/NOPB and MAX9718 series) carry MSL 1 (Unlimited) and do not require special moisture control.

Q6: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (LM4898MM/NOPB, LM4923LQ/NOPB, MAX9718AEUB+, MAX9718AEUB+T, MAX9718DEUB+, MAX9718DEUB+T) are ROHS3 Compliant and REACH Unaffected, matching the original LM4894MM/NOPB compliance status.

Q7: Which substitute offers the highest inventory availability?

A: The MAX9718AEUB+T offers the highest inventory with 6400 units in stock, followed by MAX9718DEUB+T (3668 units), LM4923LQ/NOPB (3456 units), LM4898MM/NOPB (2184 units), and MAX9718AEUB+ (1900 units). Inventory levels support immediate procurement for production requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message