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LF247D Equivalent & Substitute Parts
Part Overview
The LF247D is a J-FET operational amplifier integrated circuit manufactured by STMicroelectronics, configured as a 4-circuit device in a 14-SOIC surface mount package. This component is classified as obsolete, with 958 units currently in stock. The LF247D operates across a wide temperature range of -40°C to 105°C and is designed for applications requiring low input bias current and moderate bandwidth characteristics typical of J-FET amplifier topologies.
Due to the obsolete product status of the LF247D, identifying equivalent and substitute parts is necessary for design continuity, long-term supply chain reliability, and new production implementations. Substitute parts must maintain functional compatibility through matching amplifier type, circuit count, package form factor, and critical electrical parameters.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | J-FET | — |
| Number of Circuits | 4 | — |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| Slew Rate | 16 | V/µs |
| Gain Bandwidth Product | 4 | MHz |
| Current - Input Bias | 20 | pA |
| Voltage - Input Offset | 3 | mV |
| Current - Supply (x4 Channels) | 1.4 | mA |
| Current - Output / Channel | 40 | mA |
| Voltage - Supply Span (Min) | 44 | V |
| Voltage - Supply Span (Max) | 44 | V |
| Operating Temperature | -40 to 105 | °C |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the LF247D is determined by strict adherence to the following critical parameters:
Primary Substitution Criteria:
- Amplifier Type: J-FET (required for input bias current and offset voltage characteristics)
- Number of Circuits: 4 (functional requirement for quad-channel operation)
- Package / Case: 14-SOIC (0.154", 3.90mm Width) (physical and electrical compatibility)
- Mounting Type: Surface Mount (assembly process compatibility)
Secondary Compatibility Parameters:
- Slew Rate: 16 V/µs or greater (signal fidelity and transient response)
- Gain Bandwidth Product: 4 MHz or greater (frequency response capability)
- Current - Input Bias: 20 pA or lower (input impedance characteristics)
- Voltage - Input Offset: 3 mV or lower (DC accuracy)
- Current - Supply (x4 Channels): 1.4 mA or lower (power consumption)
- Current - Output / Channel: 40 mA or greater (load driving capability)
- Voltage - Supply Span: Minimum 44 V total span (power supply range)
- Operating Temperature: -40°C to 105°C or extended range (thermal operation)
Substitute parts are grouped into two categories: J-FET Amplifiers (direct functional equivalents) and General Purpose Amplifiers (alternative topology with different electrical characteristics). Only J-FET amplifiers maintain the input bias current and offset voltage specifications of the LF247D.
Parameter Comparison
| Parameter | LF247D | AD8513ARZ | AD8513ARZ-REEL | AD8513ARZ-REEL7 | AD8684ARZ | AD8684ARZ-REEL | AD8684ARZ-REEL7 | ADA4000-4ARZ |
|---|---|---|---|---|---|---|---|---|
| Manufacturer | STMicroelectronics | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. |
| Amplifier Type | J-FET | J-FET | J-FET | J-FET | J-FET | J-FET | J-FET | J-FET |
| Number of Circuits | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Package / Case | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC |
| Slew Rate (V/µs) | 16 | 20 | 20 | 20 | 9 | 9 | 9 | 20 |
| Gain Bandwidth Product (MHz) | 4 | 8 | 8 | 8 | 3.5 | 3.5 | 3.5 | 5 |
| Current - Input Bias (pA) | 20 | 25 | 25 | 25 | 6 | 6 | 6 | 5 |
| Voltage - Input Offset (mV) | 3 | 0.1 | 0.1 | 0.1 | 0.35 | 0.35 | 0.35 | 0.2 |
| Current - Supply (mA, x4 Channels) | 1.4 | 2.2 | 2.2 | 2.2 | 0.21 | 0.21 | 0.21 | 1.35 |
| Current - Output / Channel (mA) | 40 | 70 | 70 | 70 | 12 | 12 | 12 | 28 |
| Voltage - Supply Span Min (V) | 44 | 10 | 10 | 10 | 9 | 9 | 9 | 8 |
| Voltage - Supply Span Max (V) | 44 | 30 | 30 | 30 | 36 | 36 | 36 | 36 |
| Operating Temperature (°C) | -40 to 105 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 85 | -40 to 85 | -40 to 85 | -40 to 125 |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
All substitute parts listed are manufactured by Analog Devices Inc. and maintain active product status, ensuring long-term availability and supply chain continuity. All candidates are ROHS3 compliant and carry MSL rating of 1 (Unlimited), matching the environmental and handling specifications of the LF247D.
J-FET Amplifier Substitutes (Direct Functional Equivalents):
The AD8513ARZ, AD8513ARZ-REEL, and AD8513ARZ-REEL7 variants represent the closest functional equivalents to the LF247D. These devices maintain J-FET amplifier topology with 4 circuits in 14-SOIC packaging. The AD8513 series provides superior slew rate (20 V/µs versus 16 V/µs), higher gain bandwidth product (8 MHz versus 4 MHz), and improved input offset voltage (100 µV versus 3 mV). The AD8513 series operates across -40°C to 125°C, extending the upper temperature limit by 20°C. However, the AD8513 series specifies a maximum supply span of 30 V, which is significantly lower than the LF247D's 44 V specification. This represents a critical limitation for applications requiring the full 44 V supply range.
The ADA4000-4ARZ provides J-FET amplifier functionality with superior input bias current (5 pA versus 20 pA) and extended temperature range (-40°C to 125°C). The ADA4000-4ARZ delivers 20 V/µs slew rate and 5 MHz gain bandwidth product. The supply span range of 8 V to 36 V does not accommodate the full 44 V specification of the LF247D.
The AD8684ARZ, AD8684ARZ-REEL, and AD8684ARZ-REEL7 variants offer J-FET amplifier topology with ultra-low supply current (210 µA total for 4 channels versus 1.4 mA). These devices provide superior input bias current (6 pA) and operate across -40°C to 85°C. The AD8684 series specifies a 9 V to 36 V supply range, which does not meet the 44 V requirement.
Packaging Variants:
Substitute parts are available in three packaging configurations: Tube (standard), Tape & Reel (TR), and Cut Tape with Digi-Reel (CT). Selection between packaging variants depends on assembly process requirements and order quantity. All packaging variants maintain identical electrical specifications and compliance certifications.
Supply Voltage Consideration:
The LF247D specifies a unique 44 V supply span (minimum 44 V, maximum 44 V), indicating operation at a fixed 44 V supply voltage. No substitute part in the active product portfolio maintains this exact specification. Applications requiring 44 V operation must evaluate circuit redesign or alternative component sourcing strategies. For applications with flexible supply voltage requirements, the AD8513 series (10 V to 30 V) and ADA4000-4ARZ (8 V to 36 V) provide the closest functional equivalence with active product status.
Frequently Asked Questions (FAQ)
Q: Can the AD8513ARZ directly replace the LF247D in all applications?
A: The AD8513ARZ maintains J-FET amplifier topology, 4-circuit configuration, and 14-SOIC packaging, providing functional compatibility for most applications. However, the AD8513ARZ specifies a maximum supply voltage of 30 V, while the LF247D operates at 44 V. Applications requiring 44 V operation cannot use the AD8513ARZ without circuit redesign. The AD8513ARZ provides superior performance in slew rate (20 V/µs versus 16 V/µs) and gain bandwidth product (8 MHz versus 4 MHz).
Q: What is the difference between AD8513ARZ, AD8513ARZ-REEL, and AD8513ARZ-REEL7?
A: These three part numbers represent identical electrical specifications and performance characteristics. The differences are packaging and delivery format only. AD8513ARZ is supplied in Tube packaging, AD8513ARZ-REEL is supplied in Tape & Reel format, and AD8513ARZ-REEL7 is supplied in Cut Tape with Digi-Reel format. Selection depends on assembly process requirements and order quantity. All three variants are ROHS3 compliant with MSL rating of 1 (Unlimited).
Q: Why does the LF247D specify a 44 V supply span with identical minimum and maximum values?
A: The specification indicates operation at a fixed 44 V supply voltage rather than a range. This is an unusual specification in modern operational amplifier design. Substitute parts with active product status typically specify supply voltage ranges (such as 8 V to 36 V for the ADA4000-4ARZ) rather than fixed values. Applications designed around the LF247D's 44 V specification require evaluation of alternative sourcing or circuit modification.
Q: Which substitute part offers the lowest power consumption?
A: The AD8684 series (AD8684ARZ, AD8684ARZ-REEL, AD8684ARZ-REEL7) provides the lowest supply current at 210 µA total for 4 channels, compared to 1.4 mA for the LF247D. This represents approximately 85% reduction in power consumption. The AD8684 series maintains J-FET amplifier topology and 14-SOIC packaging. The trade-off is lower slew rate (9 V/µs versus 16 V/µs) and reduced gain bandwidth product (3.5 MHz versus 4 MHz).
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed (AD8513ARZ series, AD8684ARZ series, and ADA4000-4ARZ) are ROHS3 compliant with MSL rating of 1 (Unlimited), matching the environmental compliance of the LF247D. All parts carry REACH Unaffected status and EAR99 ECCN classification.
Q: What is the primary advantage of the ADA4000-4ARZ over the AD8513ARZ?
A: The ADA4000-4ARZ provides superior input bias current (5 pA versus 25 pA) and extended temperature range (-40°C to 125°C versus -40°C to 125°C for AD8513). Both devices deliver 20 V/µs slew rate. The ADA4000-4ARZ specifies a supply range of 8 V to 36 V, which does not accommodate the LF247D's 44 V specification. The choice between these devices depends on application requirements for input bias current performance and supply voltage range.
Q: Can the AD8674ARZ series substitute for the LF247D?
A: The AD8674ARZ series is a General Purpose amplifier topology, not a J-FET amplifier. While it maintains 4-circuit configuration and 14-SOIC packaging, the General Purpose topology exhibits significantly different input bias current (3 nA versus 20 pA) and input offset voltage (20 µV versus 3 mV) characteristics. The AD8674 series is not recommended as a substitute for the LF247D in applications requiring J-FET amplifier specifications.
Q: What inventory levels are available for substitute parts?
A: AD8513ARZ-REEL7 offers the highest inventory at 17,697 units. AD8684ARZ-REEL7 provides 2,304 units. AD8513ARZ (Tube) offers 6,907 units. AD8684ARZ (Tube) provides 4,700 units. ADA4000-4ARZ (Tube) offers 2,153 units. AD8674ARZ-REEL7 provides 4,400 units. Inventory levels should be verified with the supplier for current availability and lead time requirements.
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