LMH6639MFX Equivalent & Substitute Parts

Part Overview

The LMH6639MFX is a voltage feedback operational amplifier manufactured by Texas Instruments, housed in a SOT-23-6 surface mount package. This device is classified as Obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement. The LMH6639MFX operates as a single-circuit rail-to-rail amplifier suitable for applications requiring high-speed signal conditioning and precision amplification across supply voltages of 3V to 12V.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Voltage Feedback	—
Number of Circuits	1	—
Output Type	Rail-to-Rail	—
Slew Rate	200	V/µs
Gain Bandwidth Product	90	MHz
-3dB Bandwidth	228	MHz
Current - Input Bias	1.4	µA
Voltage - Input Offset	1.3	mV
Current - Supply	4.18	mA
Current - Output / Channel	112	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	12	V
Operating Temperature	-40 to 85	°C
Package / Case	SOT-23-6	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitute parts for the LMH6639MFX are classified into two categories based on parametric equivalence and manufacturer recommendation status.

Parametric Equivalent Parts maintain identical electrical specifications across all critical parameters: amplifier type (voltage feedback), circuit count (1), output configuration (rail-to-rail), slew rate (200V/µs), gain bandwidth product (90 MHz), -3dB bandwidth (228 MHz), input bias current (1.4 µA), input offset voltage (1.3 mV), supply current (4.18 mA), output current per channel (112 mA), and supply voltage range (3V to 12V). These parts are direct functional replacements within the same package footprint (SOT-23-6).

Manufacturer Recommended Parts from Analog Devices Inc. and Maxim Integrated provide functional substitution with variations in specific electrical parameters. These alternatives maintain the core functional requirements (voltage feedback amplifier, single circuit, rail-to-rail output, SOT-23-6 package) while offering different performance characteristics in slew rate, bandwidth, input bias current, input offset voltage, supply current, and operating temperature range. Selection among these alternatives depends on application-specific performance requirements and compliance needs.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	-3dB Bandwidth (MHz)	Input Bias (µA)	Input Offset (mV)	Supply Current (mA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	RoHS Status
LMH6639MFX	Texas Instruments	Obsolete	200	228	1.4	1.3	4.18	112	3	12	-40 to 85	Non-compliant
LMH6639MF	Texas Instruments	Last Time Buy	200	228	1.4	1.3	4.18	112	3	12	-40 to 85	ROHS3 Compliant
LMH6639MF/NOPB	Texas Instruments	Active	200	228	1.4	1.3	4.18	112	3	12	-40 to 85	ROHS3 Compliant
LMH6639MFX/NOPB	Texas Instruments	Active	200	228	1.4	1.3	4.18	112	3	12	-40 to 85	ROHS3 Compliant
AD8027ARTZ-R2	Analog Devices Inc.	Active	100	190	4	0.2	6.5	120	2.7	12	-40 to 125	ROHS3 Compliant
AD8027ARTZ-REEL7	Analog Devices Inc.	Active	100	190	4	0.2	6.5	120	2.7	12	-40 to 125	ROHS3 Compliant
ADA4805-1ARJZ-R2	Analog Devices Inc.	Active	160	105	0.47	0.009	0.5	73	3	10	-40 to 125	ROHS3 Compliant
ADA4805-1ARJZ-R7	Analog Devices Inc.	Active	160	105	0.47	0.009	0.5	73	3	10	-40 to 125	ROHS3 Compliant
MAX4380EUT+T	Analog Devices Inc./Maxim Integrated	Active	485	210	8.5	3	7.5	—	4.5	11	-40 to 85	ROHS3 Compliant
MAX4389EUT+T	Analog Devices Inc./Maxim Integrated	Active	500	85	—	—	6	95	4.5	11	-40 to 85	ROHS3 Compliant

Engineering Selection Recommendations

Direct Parametric Equivalents (Recommended Primary Substitutes):

LMH6639MF/NOPB is the primary recommended substitute. This part maintains 100% electrical parameter equivalence to the LMH6639MFX while offering Active product status and ROHS3 compliance. With 46,300 units in stock, procurement availability is optimal. The /NOPB designation indicates lead-free manufacturing, meeting modern environmental standards.

LMH6639MFX/NOPB provides an alternative within the same Texas Instruments product line, maintaining identical electrical specifications with Active status and ROHS3 compliance. This variant offers 3,495 units in inventory.

LMH6639MF represents a Last Time Buy option with identical electrical performance and ROHS3 compliance, suitable for applications where procurement timing permits extended lead times.

Manufacturer Recommended Alternatives (Performance-Dependent Selection):

AD8027ARTZ-R2 and AD8027ARTZ-REEL7 are Analog Devices alternatives suitable for applications tolerating reduced slew rate (100V/µs versus 200V/µs) and lower -3dB bandwidth (190 MHz versus 228 MHz). These parts offer superior input offset voltage (0.2 mV versus 1.3 mV) and extended operating temperature range (-40°C to 125°C). Both variants maintain ROHS3 compliance and Active status with substantial inventory availability (107,473 and 20,465 units respectively).

ADA4805-1ARJZ-R2 and ADA4805-1ARJZ-R7 are general-purpose amplifier alternatives from Analog Devices. These parts feature significantly lower input bias current (0.47 nA versus 1.4 µA) and input offset voltage (9 µV versus 1.3 mV), with reduced supply current (0.5 mA versus 4.18 mA). However, they provide lower -3dB bandwidth (105 MHz versus 228 MHz) and reduced output current capability (73 mA versus 112 mA). Maximum supply voltage is limited to 10V. Selection requires verification that application bandwidth and output current requirements are satisfied.

MAX4380EUT+T offers significantly higher slew rate (485V/µs) and comparable -3dB bandwidth (210 MHz) with higher input bias current (8.5 µA) and input offset voltage (3 mV). Supply voltage range is restricted to 4.5V to 11V. This part is suitable for high-speed applications where the LMH6639MFX bandwidth is insufficient.

MAX4389EUT+T provides the highest slew rate (500V/µs) but with reduced -3dB bandwidth (85 MHz). This part is optimized for video amplification applications and is not recommended as a general substitute for the LMH6639MFX due to bandwidth limitations.

All recommended alternatives maintain SOT-23-6 package compatibility, ROHS3 compliance, and Active product status, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can LMH6639MF/NOPB be used as a direct replacement for LMH6639MFX?

A: Yes. LMH6639MF/NOPB is a parametric equivalent with identical electrical specifications across all critical parameters: slew rate, bandwidth, input bias current, input offset voltage, supply current, output current, and supply voltage range. The primary differences are product status (Active versus Obsolete) and RoHS compliance (ROHS3 Compliant versus Non-compliant). Both parts use the SOT-23-6 package with identical pinout and footprint.

Q: What is the difference between LMH6639MF and LMH6639MF/NOPB?

A: The /NOPB designation indicates lead-free (Pb-free) manufacturing and compliance with RoHS3 regulations. Electrically, both variants are identical. LMH6639MF/NOPB is preferred for new designs and applications requiring environmental compliance certification.

Q: Why would I select AD8027ARTZ-R2 over LMH6639MF/NOPB?

A: AD8027ARTZ-R2 selection is appropriate when superior input offset voltage (0.2 mV versus 1.3 mV) and extended operating temperature range (-40°C to 125°C versus -40°C to 85°C) are required. However, this substitution involves trade-offs: reduced slew rate (100V/µs versus 200V/µs) and lower -3dB bandwidth (190 MHz versus 228 MHz). Application-specific performance requirements must be verified before selection.

Q: Can ADA4805-1ARJZ-R2 replace the LMH6639MFX in all applications?

A: No. While ADA4805-1ARJZ-R2 offers superior input bias current and input offset voltage characteristics, it provides significantly reduced -3dB bandwidth (105 MHz versus 228 MHz) and lower output current capability (73 mA versus 112 mA). Additionally, maximum supply voltage is limited to 10V. This part is suitable only for applications where bandwidth and output current requirements are lower than the LMH6639MFX specifications.

Q: What is the inventory status of substitute parts?

A: LMH6639MF/NOPB offers the highest inventory availability (46,300 units), making it the most readily available direct equivalent. AD8027ARTZ-R2 provides substantial inventory (107,473 units). All recommended alternatives maintain Active product status with confirmed stock levels, ensuring procurement reliability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts carry ROHS3 Compliant certification. The original LMH6639MFX is RoHS non-compliant. For applications requiring environmental compliance, LMH6639MF/NOPB, LMH6639MFX/NOPB, or Analog Devices alternatives (AD8027ARTZ-R2, ADA4805-1ARJZ-R2, MAX4380EUT+T, MAX4389EUT+T) are appropriate selections.

Q: What is the difference between AD8027ARTZ-R2 and AD8027ARTZ-REEL7?

A: Both parts are electrically identical. The difference is packaging format: -R2 indicates standard Cut Tape and Digi-Reel packaging, while -REEL7 indicates Tape and Reel format. Selection depends on procurement and assembly process requirements. Inventory levels differ (107,473 units for -R2 versus 20,465 units for -REEL7).

Q: Is MAX4380EUT+T suitable as a general substitute for the LMH6639MFX?

A: MAX4380EUT+T is suitable only for applications requiring higher slew rate (485V/µs) and where the reduced supply voltage range (4.5V to 11V versus 3V to 12V) is acceptable. The higher input bias current (8.5 µA) and input offset voltage (3 mV) may impact precision applications. Verification of application-specific performance requirements is necessary before selection.

Q: What package considerations apply to these substitute parts?

A: All substitute parts maintain SOT-23-6 surface mount package compatibility with identical pinout and footprint to the LMH6639MFX. No PCB layout modifications are required. Packaging format variations (Cut Tape, Digi-Reel, Tape & Reel) affect procurement and assembly processes but not electrical performance or physical compatibility.

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