LMH6642MFX Equivalent & Substitute Parts

Part Overview

The LMH6642MFX is a voltage feedback operational amplifier manufactured by Texas Instruments, housed in a SOT-23-5 surface mount package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and production continuity. The LMH6642MFX features rail-to-rail output capability with a slew rate of 135V/µs and -3dB bandwidth of 130 MHz, designed for single-circuit amplification applications requiring low input bias current and minimal input offset voltage.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Voltage Feedback	—
Number of Circuits	1	—
Output Type	Rail-to-Rail	—
Slew Rate	135	V/µs
-3dB Bandwidth	130	MHz
Current - Input Bias	1.6	µA
Voltage - Input Offset	1	mV
Current - Supply	2.7	mA
Current - Output / Channel	75	mA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	12.8	V
Operating Temperature	-40 to 85	°C
Mounting Type	Surface Mount	—
Package / Case	SC-74A, SOT-753	—
Supplier Device Package	SOT-23-5	—

Substitute Part Grouping Explanation

Substitution of the LMH6642MFX is determined by the following critical parameters: amplifier type (voltage feedback), number of circuits (1), output type (rail-to-rail), package format (SOT-23-5), and operating temperature range (-40°C to 85°C). Substitute parts must maintain compatibility across these core electrical and mechanical specifications.

The substitute parts are grouped into two categories:

Direct Manufacturer Equivalent: LMH6642MFX/NOPB is an active-status variant of the original LMH6642MFX, manufactured by Texas Instruments with identical electrical specifications and packaging. This part differs only in product status (active versus obsolete) and RoHS compliance level.

Manufacturer-Recommended Alternatives: The LT6205 series (LT6205CS5#TRMPBF, LT6205CS5#TRPBF, LT6205HS5#TRMPBF, LT6205HS5#TRPBF, LT6205IS5#TRMPBF, LT6205IS5#TRPBF) from Analog Devices Inc. and the MAX4214EUK+T from Analog Devices Inc./Maxim Integrated are functionally equivalent voltage feedback amplifiers in SOT-23-5 packaging. These alternatives maintain rail-to-rail output, single-circuit configuration, and compatible supply voltage ranges, though with enhanced performance characteristics in slew rate and bandwidth.

Parameter Comparison

Parameter	LMH6642MFX	LMH6642MFX/NOPB	LT6205CS5#TRMPBF	LT6205HS5#TRPBF	MAX4214EUK+T
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc./Maxim
Amplifier Type	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Buffer
Number of Circuits	1	1	1	1	1
Output Type	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Slew Rate (V/µs)	135	135	600	600	600
-3dB Bandwidth (MHz)	130	130	—	—	230
Current - Input Bias (µA)	1.6	1.6	—	—	5.4
Voltage - Input Offset (mV)	1	1	—	—	4
Current - Supply (mA)	2.7	2.7	4	4	5.5
Current - Output / Channel (mA)	75	75	60	60	120
Voltage - Supply Span (Min)	2.7 V	2.7 V	2.7 V	2.7 V	3.15 V
Voltage - Supply Span (Max)	12.8 V	12.8 V	12.6 V	12.6 V	11 V
Operating Temperature (°C)	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85
Package / Case	SC-74A, SOT-753	SC-74A, SOT-753	SOT-23-5 Thin, TSOT-23-5	SOT-23-5 Thin, TSOT-23-5	SC-74A, SOT-753
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: LMH6642MFX/NOPB

The LMH6642MFX/NOPB is the direct active-status equivalent manufactured by Texas Instruments. This part maintains identical electrical specifications and packaging to the obsolete LMH6642MFX while offering active product status and ROHS3 compliance. Selection of this part eliminates design modification requirements and preserves original circuit performance characteristics. Inventory availability is 23,400 units.

Secondary Recommendations: LT6205 Series (Analog Devices Inc.)

The LT6205CS5#TRMPBF, LT6205CS5#TRPBF, LT6205HS5#TRMPBF, LT6205HS5#TRPBF, LT6205IS5#TRMPBF, and LT6205IS5#TRPBF are active voltage feedback amplifiers with enhanced performance specifications. These parts feature increased slew rate (600V/µs versus 135V/µs) and higher output current capability (60 mA versus 75 mA). Supply voltage compatibility spans 2.7V to 12.6V, which overlaps the original part's 2.7V to 12.8V range. All variants are ROHS3 compliant with active product status. Selection of LT6205 variants is appropriate for applications requiring improved transient response or where enhanced performance margins are beneficial.

Tertiary Recommendation: MAX4214EUK+T (Analog Devices Inc./Maxim Integrated)

The MAX4214EUK+T is a buffer amplifier with rail-to-rail output in SOT-23-5 packaging. This part features the highest slew rate (600V/µs) and bandwidth (230 MHz) among substitute options, with maximum output current of 120 mA. Supply voltage range is 3.15V to 11V. The MAX4214EUK+T is suitable for applications requiring enhanced bandwidth and output drive capability, though higher input bias current (5.4 µA) and input offset voltage (4 mV) should be evaluated against circuit requirements.

All recommended substitutes are ROHS3 compliant and maintain active product status, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can LMH6642MFX/NOPB be used as a direct replacement for LMH6642MFX?

A: Yes. The LMH6642MFX/NOPB is manufactured by Texas Instruments with identical electrical specifications, package format (SOT-23-5), and operating temperature range (-40°C to 85°C). The primary differences are product status (active versus obsolete) and RoHS compliance level. No circuit modifications are required.

Q: What are the key differences between LMH6642MFX and LT6205 series substitutes?

A: The LT6205 series maintains voltage feedback amplifier topology, rail-to-rail output, and SOT-23-5 packaging. Primary differences include: slew rate (600V/µs versus 135V/µs), supply current (4 mA versus 2.7 mA), and output current per channel (60 mA versus 75 mA). Supply voltage ranges are compatible (2.7V to 12.6V for LT6205 versus 2.7V to 12.8V for LMH6642MFX). The LT6205 series offers enhanced transient performance.

Q: Is MAX4214EUK+T functionally equivalent to LMH6642MFX?

A: The MAX4214EUK+T is a buffer amplifier rather than a voltage feedback amplifier, representing a different amplifier topology. However, it maintains rail-to-rail output, single-circuit configuration, and SOT-23-5 packaging. The MAX4214EUK+T features higher bandwidth (230 MHz) and slew rate (600V/µs). Functional equivalence depends on circuit application requirements; buffer topology may not be suitable for all voltage feedback amplifier applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts (LMH6642MFX/NOPB, LT6205 series variants, and MAX4214EUK+T) are ROHS3 compliant. The original LMH6642MFX is RoHS non-compliant. Substitution with any recommended part satisfies ROHS3 regulatory requirements.

Q: What is the difference between LT6205 packaging variants (TRMPBF, TRPBF)?

A: Both TRMPBF and TRPBF designations indicate Tape & Reel (TR) packaging format. The specific suffix variations reflect manufacturing or distribution packaging options. Electrical specifications and performance characteristics are identical across these variants.

Q: Can LT6205IS5#TRPBF replace LT6205HS5#TRPBF?

A: Yes. Both parts are LT6205 series voltage feedback amplifiers with identical electrical specifications, slew rate (600V/µs), supply current (4 mA), output current (60 mA), and supply voltage range (2.7V to 12.6V). The "I" and "H" designations indicate temperature grade or manufacturing lot variations. Substitution is electrically equivalent.

Q: What inventory levels are available for substitute parts?

A: LMH6642MFX/NOPB: 23,400 units. LT6205CS5#TRMPBF: 1,800 units. LT6205CS5#TRPBF: 1,693 units. LT6205HS5#TRMPBF: 1,690 units. LT6205HS5#TRPBF: 1,328 units. LT6205IS5#TRMPBF: 1,283 units. LT6205IS5#TRPBF: 2,318 units. MAX4214EUK+T: 2,700 units.

Q: Are all substitute parts rated for -40°C to 85°C operating temperature?

A: Yes. All recommended substitute parts maintain the -40°C to 85°C operating temperature range specified for the original LMH6642MFX.

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