THS4281DBVRG4 Equivalent & Substitute Parts

Part Overview

The THS4281DBVRG4 is a voltage feedback operational amplifier manufactured by Texas Instruments, housed in a SOT-23-5 surface mount package. This device is classified as a single-circuit rail-to-rail output amplifier designed for general signal conditioning and amplification applications. The part is currently listed as obsolete, which necessitates identification of active equivalent and substitute components to maintain design continuity and ensure long-term supply availability. Substitute parts must maintain electrical compatibility across critical performance parameters including bandwidth, slew rate, supply voltage range, and thermal operating specifications.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Voltage Feedback	—
Number of Circuits	1	—
Output Type	Rail-to-Rail	—
Slew Rate	35	V/µs
-3dB Bandwidth	95	MHz
Current - Input Bias	500	nA
Voltage - Input Offset	500	µV
Current - Supply	800	µA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	16.5	V
Operating Temperature Range	-40 to 85	°C
Package / Case	SC-74A, SOT-753	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the THS4281DBVRG4 is determined by strict adherence to the following electrical and mechanical criteria:

Primary Substitution Criteria:

Single-circuit operational amplifier configuration
Rail-to-rail output capability
SOT-23-5 surface mount package compatibility
Voltage supply range overlap with 2.7 V minimum and 16.5 V maximum
Operating temperature range that encompasses or matches the original specification

Secondary Compatibility Parameters:

Slew rate of 35 V/µs or greater
Bandwidth of 95 MHz or greater (-3dB specification)
Input bias current of 500 nA or lower
Input offset voltage of 500 µV or lower
Supply current of 800 µA or lower

The substitute parts are grouped into two categories based on their electrical performance relative to the THS4281DBVRG4:

Category 1: Direct Replacement (Texas Instruments THS4281 Series) THS4281DBVR maintains identical electrical specifications and is the active production equivalent of the obsolete THS4281DBVRG4. This part differs only in product status (active versus obsolete) and packaging configuration (Cut Tape & Digi-Reel versus standard packaging).

Category 2: Functional Equivalents (Analog Devices LT1800 and LT6202 Series) These parts satisfy the core substitution criteria of single-circuit, rail-to-rail, SOT-23-5 amplifiers with overlapping supply voltage ranges and operating temperatures. Performance trade-offs exist in specific parameters as detailed in the Parameter Comparison table.

Parameter Comparison

Parameter	THS4281DBVRG4 (Main)	THS4281DBVR	LT1800CS5#TRMPBF	LT1800IS5#TRMPBF	LT6202CS5#TRPBF	LT6202HS5#TRPBF	LT6202IS5#TR
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices
Amplifier Type	Voltage Feedback	Voltage Feedback	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Number of Circuits	1	1	1	1	1	1	1
Output Type	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Slew Rate (V/µs)	35	35	23	23	25	25	25
Bandwidth / Gain Bandwidth Product (MHz)	95	95	70	70	100	100	100
Current - Input Bias (nA)	500	500	400	400	3800	3800	3800
Voltage - Input Offset (µV)	500	500	1000	1000	2600	2600	2600
Current - Supply (µA)	800	800	1800	1800	2800	2800	2800
Voltage - Supply Span Min (V)	2.7	2.7	2.3	2.3	2.5	2.5	2.5
Voltage - Supply Span Max (V)	16.5	16.5	12.6	12.6	12.6	12.6	12.6
Operating Temperature Range (°C)	-40 to 85	-40 to 85	0 to 70	-40 to 85	0 to 70	-40 to 125	-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	SOT-23-5 Thin, TSOT-23-5	SOT-23-5 Thin, TSOT-23-5	SOT-23-5 Thin, TSOT-23-5
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
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Tier 1: Primary Recommendation

THS4281DBVR is the recommended substitute for THS4281DBVRG4. This part maintains complete electrical and mechanical compatibility with identical specifications across all critical parameters: 35 V/µs slew rate, 95 MHz bandwidth, 500 nA input bias current, and 500 µV input offset voltage. The part is in active production status with 23,300 units in stock, ensuring long-term availability. Both parts are ROHS3 compliant with MSL 1 rating and identical supply voltage ranges (2.7 V to 16.5 V) and operating temperature specifications (-40°C to 85°C). The only difference is packaging configuration (Cut Tape & Digi-Reel versus standard packaging) and product status transition from obsolete to active.

Tier 2: Functional Equivalents with Performance Trade-offs

LT1800IS5#TRMPBF and LT1800IS5#TRPBF (Analog Devices) are suitable substitutes when supply voltage requirements do not exceed 12.6 V and operating temperature range is -40°C to 85°C. These parts provide lower input bias current (400 nA) and lower input offset voltage (1000 µV) compared to the THS4281DBVRG4, but operate at reduced slew rate (23 V/µs) and bandwidth (70 MHz). Supply current is higher at 1800 µA. These parts are ROHS3 compliant with MSL 1 rating and are in active production.

LT6202IS5#TR (Analog Devices) operates within the -40°C to 85°C temperature range with supply voltage range of 2.5 V to 12.6 V. This part provides higher bandwidth (100 MHz) than the THS4281DBVRG4 but exhibits higher input bias current (3800 nA), higher input offset voltage (2600 µV), and higher supply current (2800 µA). Slew rate is 25 V/µs. This part is ROHS3 compliant with MSL 1 rating and has the highest inventory availability at 496,608 units.

LT6202HS5#TRPBF (Analog Devices) extends the operating temperature range to -40°C to 125°C, providing enhanced thermal performance. Supply voltage range is 2.5 V to 12.6 V. Performance characteristics match LT6202IS5#TR with 100 MHz bandwidth, 25 V/µs slew rate, 3800 nA input bias current, and 2600 µV input offset voltage. This part is ROHS3 compliant with MSL 1 rating and has 15,800 units in stock.

Tier 3: Limited Compatibility

LT1800CS5#TRMPBF and LT1800CS5#TRPBF operate within 0°C to 70°C temperature range, which does not fully encompass the THS4281DBVRG4 specification of -40°C to 85°C. These parts are suitable only for applications with restricted temperature requirements. Supply voltage range is 2.3 V to 12.6 V. Electrical characteristics include 23 V/µs slew rate, 70 MHz bandwidth, 400 nA input bias current, and 1000 µV input offset voltage.

LT6202CS5#TRMPBF and LT6202CS5#TRPBF operate within 0°C to 70°C temperature range, limiting their use to applications not requiring full -40°C to 85°C coverage. Supply voltage range is 2.5 V to 12.6 V. Electrical characteristics include 100 MHz bandwidth, 25 V/µs slew rate, 3800 nA input bias current, and 2600 µV input offset voltage.

All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring regulatory and environmental compatibility with the original THS4281DBVRG4 specification.

Frequently Asked Questions (FAQ)

Q1: Can THS4281DBVR be used as a direct replacement for THS4281DBVRG4?

A: Yes. THS4281DBVR is the active production equivalent of the obsolete THS4281DBVRG4. All electrical specifications are identical, including slew rate (35 V/µs), bandwidth (95 MHz), input bias current (500 nA), input offset voltage (500 µV), supply voltage range (2.7 V to 16.5 V), and operating temperature range (-40°C to 85°C). The parts are pin-compatible in SOT-23-5 packaging. The only difference is product status and packaging configuration.

Q2: What are the key differences between THS4281DBVRG4 and the Analog Devices LT1800 series?

A: The LT1800 series operates at reduced slew rate (23 V/µs versus 35 V/µs) and lower bandwidth (70 MHz versus 95 MHz). Input bias current is lower (400 nA versus 500 nA), and input offset voltage is higher (1000 µV versus 500 µV). Supply voltage maximum is limited to 12.6 V versus 16.5 V for the THS4281DBVRG4. Operating temperature range for the industrial grade (LT1800IS5) matches the original at -40°C to 85°C, but commercial grade (LT1800CS5) is limited to 0°C to 70°C.

Q3: What are the key differences between THS4281DBVRG4 and the Analog Devices LT6202 series?

A: The LT6202 series provides higher bandwidth (100 MHz versus 95 MHz) but operates at lower slew rate (25 V/µs versus 35 V/µs). Input bias current is significantly higher (3800 nA versus 500 nA), and input offset voltage is higher (2600 µV versus 500 µV). Supply current is higher (2800 µA versus 800 µA). Supply voltage maximum is limited to 12.6 V versus 16.5 V. The industrial grade (LT6202IS5) operates at -40°C to 85°C, while the high-temperature grade (LT6202HS5) extends to -40°C to 125°C.

Q4: Are all substitute parts pin-compatible with THS4281DBVRG4?

A: Yes. All substitute parts use SOT-23-5 or TSOT-23-5 packaging, which are mechanically and electrically compatible. Pin assignments for single-circuit operational amplifiers in this package class are standardized. However, circuit performance will differ based on the electrical parameter variations listed in the Parameter Comparison table.

Q5: Which substitute part should be selected for applications requiring maximum supply voltage above 12.6 V?

A: THS4281DBVR is the only substitute that maintains the 16.5 V maximum supply voltage specification of the THS4281DBVRG4. All Analog Devices alternatives (LT1800 and LT6202 series) are limited to 12.6 V maximum supply voltage. If the application requires operation above 12.6 V, THS4281DBVR is the mandatory choice.

Q6: Which substitute part should be selected for applications requiring the lowest input offset voltage?

A: THS4281DBVR maintains the original 500 µV input offset voltage specification. Among the Analog Devices alternatives, LT1800 series provides 1000 µV input offset voltage, while LT6202 series provides 2600 µV input offset voltage. For applications requiring the lowest input offset voltage, THS4281DBVR is the optimal choice.

Q7: Which substitute part should be selected for applications requiring the highest slew rate?

A: THS4281DBVR maintains the original 35 V/µs slew rate specification. Among the Analog Devices alternatives, LT6202 series provides 25 V/µs, and LT1800 series provides 23 V/µs. For applications requiring the highest slew rate, THS4281DBVR is the optimal choice.

Q8: Can LT1800CS5#TRMPBF or LT6202CS5#TRPBF be used in applications requiring -40°C operation?

A: No. Both LT1800CS5#TRMPBF and LT6202CS5#TRPBF are commercial grade parts with operating temperature range of 0°C to 70°C. They cannot be used in applications requiring operation at -40°C. Industrial grade alternatives (LT1800IS5#TRMPBF or LT6202IS5#TR) with -40°C to 85°C range must be selected instead.

Q9: What is the inventory status of substitute parts?

A: THS4281DBVR has 23,300 units in stock. LT1800 series parts range from 1,135 to 9,232 units. LT6202 series parts range from 1,331 to 496,608 units, with LT6202IS5#TR having the highest availability. All parts are in active production status.

Q10: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed, including THS4281DBVR and all Analog Devices alternatives (LT1800 and LT6202 series), are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level rating. All parts are REACH unaffected and classified as EAR99 for export control purposes.

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