LM833MX Audio Amplifier 2 Circuit 8-SOIC Equivalent & Substitute Parts

Part Overview

The LM833MX is a dual-channel audio amplifier integrated circuit manufactured by Texas Instruments in 8-SOIC surface mount packaging. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and production continuity. The LM833MX delivers audio-grade amplification with a 15 MHz gain bandwidth product and 7 V/µs slew rate, suitable for audio signal processing applications requiring dual independent amplification channels.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Audio	—
Number of Circuits	2	—
Slew Rate	7	V/µs
Gain Bandwidth Product	15	MHz
Current - Input Bias	500	nA
Voltage - Input Offset	300	µV
Current - Supply	5	mA (x2 Channels)
Current - Output / Channel	40	mA
Voltage - Supply Span (Min)	10	V
Voltage - Supply Span (Max)	30	V
Operating Temperature	-40 to 85	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the LM833MX is determined by strict alignment of electrical and mechanical parameters. The following criteria establish valid substitute relationships:

Primary Substitution Criteria:

Dual-channel amplifier configuration (2 circuits)
8-SOIC surface mount package (0.154" width, 3.90mm)
Audio amplifier classification or equivalent general-purpose amplifier performance
Slew rate ≥ 7 V/µs
Gain bandwidth product ≥ 15 MHz
Output current per channel ≥ 40 mA
Supply voltage range encompassing 10 V to 30 V operation
Operating temperature range including -40°C to 85°C

Secondary Substitution Criteria (J-FET Amplifiers):

J-FET input stage amplifiers with dual channels in 8-SOIC package
Slew rate ≥ 16 V/µs (superior performance)
Output current per channel ≥ 40 mA
Supply voltage range ≥ 6 V to 36 V
Extended operating temperature to 105°C

Substitutes are grouped into three categories: direct manufacturer variants (same base part number, different packaging/compliance), audio-grade amplifiers (equivalent electrical performance), and J-FET amplifiers (superior input characteristics for specialized applications).

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Product Status	RoHS Status
LM833MX	Texas Instruments	Audio	7	15	500	40	10	30	-40 to 85	Obsolete	Non-compliant
LM833MX/NOPB	Texas Instruments	Audio	7	15	500	40	10	30	-40 to 85	Active	ROHS3 Compliant
LM833DR2G	onsemi	Audio	7	15	300	29	10	36	-40 to 85	Active	ROHS3 Compliant
LM833DT	STMicroelectronics	Audio	7	15	300	37	5	30	-40 to 105	Active	ROHS3 Compliant
LF253DT	STMicroelectronics	J-FET	16	4	0.02	40	6	36	-40 to 105	Active	ROHS3 Compliant
LF353DT	STMicroelectronics	J-FET	16	4	0.02	40	6	36	0 to 70	Active	ROHS3 Compliant
BA3404F-E2	Rohm Semiconductor	General Purpose	1.2	1.2	70	30	4	36	-40 to 85	Active	ROHS3 Compliant
LT1462ACS8#PBF	Analog Devices Inc.	J-FET	0.13	0.175	0.001	17	10	30	0 to 70	Active	ROHS3 Compliant
LT1462ACS8#TRPBF	Analog Devices Inc.	J-FET	0.13	0.175	0.001	17	10	30	0 to 70	Active	ROHS3 Compliant
LT1462CS8#PBF	Analog Devices Inc.	J-FET	0.13	0.175	0.001	17	10	30	0 to 70	Active	ROHS3 Compliant
LT1462CS8#TRPBF	Analog Devices Inc.	J-FET	0.13	0.175	0.001	17	10	30	0 to 70	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility):

LM833MX/NOPB is the primary direct replacement. This part maintains identical electrical specifications to the obsolete LM833MX while offering active product status and ROHS3 compliance. The packaging format (Cut Tape & Digi-Reel) ensures compatibility with automated assembly processes. This selection eliminates design re-qualification requirements.

Audio Amplifier Alternatives (Active Status):

LM833DR2G (onsemi) and LM833DT (STMicroelectronics) are active-status audio amplifiers based on the LM833 architecture. Both maintain the 7 V/µs slew rate and 15 MHz gain bandwidth product. LM833DR2G extends maximum supply voltage to 36 V. LM833DT extends operating temperature to 105°C and reduces minimum supply voltage to 5 V, offering broader environmental tolerance. Both are ROHS3 compliant.

J-FET Amplifier Alternatives (Specialized Applications):

LF253DT and LF353DT (STMicroelectronics) provide J-FET input stages with superior input bias current (20 pA versus 500 nA). These devices deliver higher slew rate (16 V/µs) and extended supply voltage range (6 V to 36 V). LF253DT supports -40°C to 105°C operation; LF353DT operates 0°C to 70°C. Selection depends on application requirements for input impedance and noise performance.

Limited Compatibility Alternatives:

BA3404F-E2 (Rohm Semiconductor) is a general-purpose amplifier with push-pull output configuration. This device exhibits significantly lower slew rate (1.2 V/µs) and gain bandwidth product (1.2 MHz), making it unsuitable for audio applications requiring the LM833MX performance envelope.

LT1462 series (Analog Devices Inc.) devices feature ultra-low input bias current (1 pA) but deliver substantially reduced slew rate (0.13 V/µs), gain bandwidth product (175 kHz), and output current (17 mA). These specifications fall below LM833MX requirements and are not recommended for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can LM833MX/NOPB be used as a direct drop-in replacement for LM833MX?

A: Yes. LM833MX/NOPB maintains identical electrical specifications and 8-SOIC package dimensions. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 versus non-compliant). No circuit modifications are required.

Q: What is the difference between LM833DR2G and LM833DT?

A: Both are LM833-based audio amplifiers with identical slew rate (7 V/µs) and gain bandwidth product (15 MHz). LM833DR2G (onsemi) supports supply voltage to 36 V and operates -40°C to 85°C. LM833DT (STMicroelectronics) supports supply voltage to 30 V but extends operating temperature to 105°C. Selection depends on supply voltage and temperature requirements.

Q: Why do LF253DT and LF353DT have lower gain bandwidth product than LM833MX?

A: LF253DT and LF353DT are J-FET input amplifiers optimized for ultra-low input bias current (20 pA) and high input impedance, not bandwidth. The 4 MHz gain bandwidth product reflects this design trade-off. These devices are suitable for applications prioritizing input impedance over bandwidth.

Q: Is BA3404F-E2 suitable for audio applications?

A: BA3404F-E2 is classified as a general-purpose amplifier with push-pull output. The 1.2 V/µs slew rate and 1.2 MHz gain bandwidth product are insufficient for audio applications requiring LM833MX performance. This device is not recommended for direct substitution.

Q: What packaging options are available for LM833 audio amplifiers?

A: LM833MX/NOPB is supplied in Cut Tape (CT) & Digi-Reel format. LM833DR2G is supplied in Tape & Reel (TR). LM833DT is supplied in Cut Tape (CT) & Digi-Reel format. All three maintain 8-SOIC (0.154", 3.90mm width) package dimensions compatible with standard surface mount assembly equipment.

Q: Are all substitute parts RoHS3 compliant?

A: All active-status substitute parts listed (LM833MX/NOPB, LM833DR2G, LM833DT, LF253DT, LF353DT, BA3404F-E2, and LT1462 series) are ROHS3 compliant. The original LM833MX is RoHS non-compliant due to obsolete status.

Q: Can LT1462 series replace LM833MX in audio circuits?

A: LT1462 series devices are not recommended for direct substitution. Output current per channel (17 mA) falls below LM833MX specification (40 mA). Slew rate (0.13 V/µs) and gain bandwidth product (175 kHz) are substantially lower. These devices are suitable only for low-speed, low-power applications with different performance requirements.

Q: What is the minimum supply voltage for each substitute?

A: LM833MX/NOPB and LM833DR2G require minimum 10 V. LM833DT requires minimum 5 V. LF253DT and LF353DT require minimum 6 V. BA3404F-E2 requires minimum 4 V. LT1462 series requires minimum 10 V. Circuit design must accommodate these minimum voltage thresholds.

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