ALD1721GSAL Equivalent & Substitute Parts

Part Overview

The ALD1721GSAL is a general-purpose operational amplifier manufactured by Advanced Linear Devices Inc., housed in an 8-SOIC surface mount package. This rail-to-rail output amplifier is designed for low-power applications requiring minimal input bias current and moderate bandwidth performance. The device is currently in active production status with 637 units available in inventory.

Substitute parts are necessary when the ALD1721GSAL becomes unavailable, when alternative supply chain sources are required, or when design specifications permit operation with enhanced performance characteristics while maintaining package and functional compatibility.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Output Type	Rail-to-Rail	—
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Slew Rate	1	V/µs
Gain Bandwidth Product	1	MHz
Current - Input Bias	0.01	pA
Voltage - Input Offset	150	µV
Current - Supply	110	µA
Current - Output / Channel	1	mA
Voltage - Supply Span (Min)	2	V
Voltage - Supply Span (Max)	10	V
Operating Temperature	0 to 70	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution compatibility for the ALD1721GSAL is determined by the following mandatory criteria:

Functional Requirements:

Amplifier Type: General Purpose
Number of Circuits: 1
Output Type: Rail-to-Rail
Mounting Type: Surface Mount

Package Compatibility:

Package / Case: 8-SOIC (0.154", 3.90mm Width)

Electrical Operating Range:

Voltage - Supply Span (Min): ≥ 2 V
Voltage - Supply Span (Max): ≥ 10 V

Substitute parts may exceed the ALD1721GSAL in performance parameters such as slew rate, gain bandwidth product, current output capability, and operating temperature range. Enhanced specifications do not preclude substitution when the above mandatory criteria are satisfied. However, parts with reduced supply voltage range, lower output current capability, or incompatible packaging are not suitable substitutes.

Parameter Comparison

Parameter	ALD1721GSAL	LMP7707MA/NOPB	LTC6240HVCS8#PBF	LTC6240HVHS8#PBF	LTC6240HVIS8#PBF	LTC6240HVIS8#TRPBF	OPA725AID	OPA725AIDR	TL971QDRQ1	TLV2241ID
Manufacturer	Advanced Linear Devices Inc.	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Number of Circuits	1	1	1	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	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Slew Rate (V/µs)	1	5.9	10	10	10	10	30	30	5	0.002
Gain Bandwidth Product (MHz)	1	15	18	18	18	18	20	20	12	0.0055
Current - Input Bias (pA)	0.01	0.2	0.5	0.5	0.5	0.5	30	30	200	100
Voltage - Input Offset (µV)	150	37	60	60	60	60	1200	1200	1000	600
Current - Supply (µA)	110	790	2700	2700	2700	2700	4300	4300	2000	1
Current - Output / Channel (mA)	1	86	35	35	35	35	40	40	80	0.2
Voltage - Supply Span (Min) (V)	2	2.7	2.8	2.8	2.8	2.8	4	4	2.7	2.5
Voltage - Supply Span (Max) (V)	10	12	11	11	11	11	12	12	12	12
Operating Temperature (°C)	0 to 70	-40 to 125	0 to 70	-40 to 125	-40 to 85	-40 to 85	-40 to 125	-40 to 125	-40 to 125	-40 to 85
Product Status	Active	Active	Active	Active	Active	Active	Active	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	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)	2 (1 Year)	2 (1 Year)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Active Status, Matching Operating Temperature Range):

The LTC6240HVCS8#PBF from Analog Devices Inc. is the preferred substitute when the ALD1721GSAL is unavailable. This device maintains the 0°C to 70°C operating temperature range of the original part, shares identical package specifications, and provides enhanced performance with 10 V/µs slew rate and 18 MHz gain bandwidth product. All electrical parameters remain within acceptable substitution limits, and the part is in active production with 12,841 units in inventory.

Secondary Substitutes (Extended Operating Temperature Range):

The LTC6240HVHS8#PBF and LTC6240HVIS8#PBF variants from Analog Devices Inc. offer extended operating temperature ranges (-40°C to 125°C and -40°C to 85°C respectively) while maintaining identical electrical performance to the LTC6240HVCS8#PBF. These parts are suitable for applications requiring operation beyond the standard 0°C to 70°C range. The LTC6240HVIS8#TRPBF is the tape and reel packaging variant of the LTC6240HVIS8#PBF.

Alternative Substitutes (Enhanced Performance):

The LMP7707MA/NOPB from Texas Instruments provides superior slew rate (5.9 V/µs) and gain bandwidth product (15 MHz) with extended temperature range (-40°C to 125°C). This device is suitable for applications where higher bandwidth performance is beneficial.

The OPA725AID and OPA725AIDR from Texas Instruments deliver the highest performance specifications with 30 V/µs slew rate and 20 MHz gain bandwidth product. However, these devices require a minimum supply voltage of 4 V, which exceeds the ALD1721GSAL minimum of 2 V. Substitution is valid only for applications with supply voltages of 4 V or higher.

The TL971QDRQ1 from Texas Instruments is an automotive-grade device (AEC-Q100 qualified) suitable for applications requiring automotive qualification. This part operates across -40°C to 125°C and provides 80 mA output current capability.

Not Recommended:

The TLV2241ID is marked as obsolete and exhibits significantly reduced performance specifications (0.002 V/µs slew rate, 5.5 kHz gain bandwidth product, 0.2 mA output current). This part is not suitable as a substitute for the ALD1721GSAL in active designs.

Compliance and Regulatory:

All recommended substitute parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 and HTSUS 8542.33.0001, matching the regulatory status of the ALD1721GSAL.

Frequently Asked Questions (FAQ)

Q: Can the LTC6240HVCS8#PBF directly replace the ALD1721GSAL in existing PCB layouts?

A: Yes. Both devices use identical 8-SOIC (0.154", 3.90mm Width) surface mount packaging with the same pinout configuration for single-channel general-purpose amplifiers. No PCB layout modifications are required.

Q: What is the primary difference between LTC6240HVCS8#PBF, LTC6240HVHS8#PBF, and LTC6240HVIS8#PBF?

A: These three variants share identical electrical performance but differ in operating temperature range. The HVCS8 operates 0°C to 70°C, the HVHS8 operates -40°C to 125°C, and the HVIS8 operates -40°C to 85°C. Select based on your application's temperature requirements.

Q: Why does the OPA725AID require a minimum 4 V supply voltage when the ALD1721GSAL operates at 2 V minimum?

A: The OPA725AID is designed with different internal architecture optimized for higher performance (30 V/µs slew rate, 20 MHz bandwidth). This design requires higher minimum supply voltage. Substitution is valid only if your application supplies 4 V or higher.

Q: Is the TLV2241ID suitable as a substitute?

A: No. The TLV2241ID is marked as obsolete and exhibits performance specifications significantly below the ALD1721GSAL (0.002 V/µs slew rate versus 1 V/µs, 5.5 kHz bandwidth versus 1 MHz). This part is not recommended for new designs or as a substitute.

Q: What is the difference between tube and tape & reel packaging?

A: Tube packaging contains individual components in a plastic tube suitable for manual handling and smaller quantity orders. Tape & reel packaging (TR designation) contains components on continuous tape wound on reels, optimized for automated assembly processes and high-volume production. Electrical specifications are identical; packaging choice depends on manufacturing process requirements.

Q: Can I use the TL971QDRQ1 in non-automotive applications?

A: Yes. The TL971QDRQ1 is automotive-grade (AEC-Q100 qualified) but can be used in general industrial and commercial applications. Automotive qualification indicates enhanced reliability and testing standards, making it suitable for any application requiring high reliability.

Q: What does MSL 1 (Unlimited) mean for moisture sensitivity?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life when stored in normal conditions without requiring special moisture-barrier packaging or desiccant. This is the least restrictive moisture sensitivity level. MSL 2 (1 Year) requires more careful storage management.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts listed are ROHS3 compliant, matching the regulatory status of the ALD1721GSAL. This ensures compatibility with environmental and hazardous substance regulations.

Q: What inventory levels should I consider when selecting a substitute?

A: The LTC6240HVCS8#PBF has the highest inventory availability at 12,841 units, followed by OPA725AIDR at 7,879 units. Higher inventory levels reduce lead time risk and support supply chain continuity for long-term production requirements.

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