BUF634F Equivalent & Substitute Parts

Part Overview

The BUF634F is a buffer amplifier integrated circuit manufactured by Texas Instruments, housed in a TO-263 (DDPAK-5) surface mount package. This device functions as a single-circuit buffer amplifier with a slew rate of 2000V/µs and -3dB bandwidth of 180 MHz, designed for signal buffering applications requiring high-speed operation and moderate output current capability.

The BUF634F carries an Obsolete product status, indicating that Texas Instruments has discontinued active production and support for this component. Identifying equivalent and substitute parts is necessary for ongoing system maintenance, design updates, and procurement continuity when original stock becomes unavailable.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Buffer	—
Number of Circuits	1	—
Slew Rate	2000	V/µs
-3dB Bandwidth	180	MHz
Current - Input Bias	5	µA
Voltage - Input Offset	30	mV
Current - Supply	15	mA
Current - Output / Channel	250	mA
Voltage - Supply Span (Min)	4.5	V
Voltage - Supply Span (Max)	36	V
Operating Temperature Range	-40 to 85	°C
Mounting Type	Surface Mount	—
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)	—

Substitute Part Grouping Explanation

Substitute parts for the BUF634F are identified based on strict equivalence of electrical and mechanical parameters. The substitution logic is structured as follows:

Primary Substitution Criteria:

Amplifier Type: Buffer
Number of Circuits: 1
Package / Case: TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
Mounting Type: Surface Mount
Operating Temperature Range: -40°C to 85°C
Slew Rate: 2000V/µs
-3dB Bandwidth: 180 MHz
Current - Output / Channel: 250 mA
Voltage - Supply Span: 4.5V to 36V

Substitute Parts Identified:

BUF634FKTTT (Direct Manufacturer Equivalent): Identical electrical specifications and package configuration. Differs in packaging format (Tape & Reel vs. bulk) and product status (Not For New Designs). RoHS3 compliant.
LME49600TS/NOPB (Manufacturer Recommended Alternative): Class AB amplifier with 1-channel (Mono) output configuration. Housed in identical TO-263 (DDPAK-5) package. Operates within compatible supply voltage range (±2.25V to 18V). Includes short-circuit and thermal protection features. RoHS3 compliant and Active product status.

Parameter Comparison

Parameter	BUF634F	BUF634FKTTT	LME49600TS/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Category	Linear, Amplifiers	Linear, Amplifiers	Linear, Amplifiers
Amplifier Type	Buffer	Buffer	Class AB
Number of Circuits	1	1	1
Slew Rate	2000 V/µs	2000 V/µs	Not specified
-3dB Bandwidth	180 MHz	180 MHz	Not specified
Current - Input Bias	5 µA	5 µA	Not specified
Voltage - Input Offset	30 mV	30 mV	Not specified
Current - Supply	15 mA	15 mA	Not specified
Current - Output / Channel	250 mA	250 mA	500 mW @ 32Ω
Voltage - Supply Span (Min)	4.5 V	4.5 V	±2.25 V
Voltage - Supply Span (Max)	36 V	36 V	±18 V
Operating Temperature	-40 to 85°C	-40 to 85°C	-40 to 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)	TO-263-6, D2PAK (5 Leads + Tab)	TO-263-6, D2PAK (5 Leads + Tab)
Product Status	Obsolete	Not For New Designs	Active
RoHS Status	RoHS non-compliant	RoHS3 Compliant	RoHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)	2 (1 Year)	3 (168 Hours)

Engineering Selection Recommendations

BUF634FKTTT Selection Criteria:

BUF634FKTTT is a direct electrical and mechanical equivalent to BUF634F. Both devices share identical buffer amplifier specifications, slew rate, bandwidth, and supply voltage parameters. The primary distinction is packaging format (Tape & Reel vs. bulk) and product lifecycle status. BUF634FKTTT carries RoHS3 compliance, whereas BUF634F is RoHS non-compliant. BUF634FKTTT is designated "Not For New Designs," indicating limited long-term availability. This substitute is appropriate for direct replacement in existing designs where component-level compatibility is the primary requirement and RoHS compliance is necessary.

LME49600TS/NOPB Selection Criteria:

LME49600TS/NOPB is a manufacturer-recommended alternative with Active product status, ensuring ongoing availability and support. This device operates as a Class AB amplifier with 1-channel (Mono) output configuration, differing functionally from the buffer topology of BUF634F. The LME49600TS/NOPB is housed in the identical TO-263 (DDPAK-5) package and operates within compatible temperature ranges (-40°C to 85°C). Supply voltage operation differs: LME49600TS/NOPB operates on ±2.25V to ±18V (bipolar supply), whereas BUF634F operates on 4.5V to 36V (unipolar supply). LME49600TS/NOPB includes integrated short-circuit and thermal protection features and carries RoHS3 compliance. This substitute is appropriate for applications where Class AB amplification with integrated protection is acceptable and long-term component availability is prioritized.

Frequently Asked Questions (FAQ)

Q1: Can BUF634FKTTT be used as a direct replacement for BUF634F?

A: Yes. BUF634FKTTT is electrically and mechanically equivalent to BUF634F. Both devices feature identical buffer amplifier specifications, slew rate (2000V/µs), bandwidth (180 MHz), output current (250 mA), and supply voltage range (4.5V to 36V). The primary differences are packaging format and RoHS compliance status. BUF634FKTTT is suitable for direct substitution in existing circuit designs.

Q2: What are the functional differences between BUF634F and LME49600TS/NOPB?

A: BUF634F is a buffer amplifier, while LME49600TS/NOPB is a Class AB amplifier. Buffer amplifiers provide high input impedance and low output impedance for signal buffering applications. Class AB amplifiers are designed for audio and power amplification with integrated protection features. The LME49600TS/NOPB includes short-circuit and thermal protection, which BUF634F does not specify. Supply voltage operation differs: BUF634F uses unipolar supply (4.5V to 36V), while LME49600TS/NOPB uses bipolar supply (±2.25V to ±18V).

Q3: Are all substitute parts housed in the same package?

A: Yes. BUF634F, BUF634FKTTT, and LME49600TS/NOPB are all housed in the TO-263-6 package, also designated as D2PAK (5 Leads + Tab) or TO-263BA. This identical package configuration ensures mechanical compatibility and identical PCB footprints across all three devices.

Q4: What is the difference in product status between the three parts?

A: BUF634F is Obsolete, indicating discontinued production. BUF634FKTTT is designated "Not For New Designs," indicating limited availability and no active development support. LME49600TS/NOPB is Active, indicating ongoing production, full manufacturer support, and long-term availability. For new designs, LME49600TS/NOPB is the preferred choice.

Q5: Do all substitute parts meet RoHS compliance requirements?

A: BUF634F is RoHS non-compliant. BUF634FKTTT and LME49600TS/NOPB are both RoHS3 compliant. If RoHS compliance is a design requirement, BUF634FKTTT or LME49600TS/NOPB must be selected.

Q6: What is the moisture sensitivity level (MSL) difference?

A: BUF634F and BUF634FKTTT both have MSL 2 (1 Year), indicating moderate moisture sensitivity with a one-year floor life. LME49600TS/NOPB has MSL 3 (168 Hours), indicating higher moisture sensitivity with a 168-hour (7-day) floor life. MSL 3 components require more stringent moisture control during storage and handling.

Q7: Can LME49600TS/NOPB be used in applications designed for BUF634F?

A: Substitution depends on application requirements. Both devices operate within the -40°C to 85°C temperature range and share identical TO-263 packaging. However, functional differences exist: BUF634F is a buffer amplifier optimized for high-speed signal buffering, while LME49600TS/NOPB is a Class AB amplifier designed for audio power amplification. Supply voltage requirements differ significantly. Circuit redesign may be necessary to accommodate the different amplifier topology and bipolar supply requirements of LME49600TS/NOPB.

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