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LF253DT Equivalent & Substitute Parts
Part Overview
The LF253DT is a J-FET operational amplifier manufactured by STMicroelectronics, configured as a dual-channel (2 circuit) device in an 8-SOIC surface mount package. This component is classified as a linear amplifier and maintains Active product status. The LF253DT is specified for applications requiring low input bias current and moderate slew rate performance across extended temperature ranges. Substitute parts are identified when equivalent functional performance, package compatibility, and electrical specifications align with application requirements.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | J-FET | — |
| Number of Circuits | 2 | — |
| Package / Case | 8-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 | 1.4 (x2 Channels) | mA |
| Current - Output / Channel | 40 | mA |
| Voltage - Supply Span (Min) | 6 | V |
| Voltage - Supply Span (Max) | 36 | V |
| Operating Temperature | -40°C ~ 105°C | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for the LF253DT are identified based on strict alignment with the following critical parameters:
Primary Substitution Criteria:
- Amplifier Type: J-FET configuration
- Number of Circuits: 2 (dual-channel)
- Package / Case: 8-SOIC form factor
- Mounting Type: Surface Mount
- Voltage Supply Range: Minimum 6V to Maximum 36V overlap
- Operating Temperature Range: Compatibility with application requirements
- RoHS3 Compliance and MSL Level 1 status
Substitution Logic:
The AD648 series (AD648JRZ, AD648JRZ-REEL, AD648JRZ-REEL7, AD648KRZ) represents J-FET amplifiers with identical package and circuit configuration. These parts operate within the LF253DT supply voltage envelope (9V to 36V minimum/maximum) and maintain equivalent dual-channel architecture. However, the AD648 series exhibits reduced slew rate (1.8V/µs versus 16V/µs) and lower gain bandwidth product (1 MHz versus 4 MHz), making them suitable only for applications where these performance reductions are acceptable.
The AD706 series (AD706ARZ, AD706ARZ-REEL, AD706ARZ-REEL7, AD706JRZ, AD706JRZ-REEL, AD706JRZ-REEL7) comprises general-purpose amplifiers in identical 8-SOIC packaging with dual-channel configuration. These parts operate across a wider minimum supply voltage range (4V to 36V) but feature significantly lower slew rate (0.15V/µs) and gain bandwidth product (800 kHz). The AD706 series is not functionally equivalent to the LF253DT due to amplifier type classification (General Purpose versus J-FET) and performance characteristics.
Parameter Comparison
| Parameter | LF253DT | AD648JRZ | AD648JRZ-REEL | AD648JRZ-REEL7 | AD648KRZ | AD706ARZ | AD706ARZ-REEL | AD706ARZ-REEL7 | AD706JRZ | AD706JRZ-REEL | AD706JRZ-REEL7 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | STMicroelectronics | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | 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 | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose |
| Number of Circuits | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Package / Case | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Slew Rate (V/µs) | 16 | 1.8 | 1.8 | 1.8 | 1.8 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 |
| Gain Bandwidth Product (MHz) | 4 | 1 | 1 | 1 | 1 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 |
| Current - Input Bias (pA) | 20 | 5 | 5 | 5 | 3 | 50 | 50 | 50 | 50 | 50 | 50 |
| Voltage - Input Offset (mV) | 3 | 0.75 | 0.75 | 0.75 | 0.3 | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 |
| Current - Supply (mA) | 1.4 | 0.34 | 0.34 | 0.34 | 0.34 | 0.75 | 0.75 | 0.75 | 0.75 | 0.75 | 0.75 |
| Current - Output / Channel (mA) | 40 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 |
| Voltage - Supply Span Min (V) | 6 | 9 | 9 | 9 | 9 | 4 | 4 | 4 | 4 | 4 | 4 |
| Voltage - Supply Span Max (V) | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 |
| Operating Temperature (°C) | -40 ~ 105 | 0 ~ 70 | 0 ~ 70 | 0 ~ 70 | 0 ~ 70 | -40 ~ 85 | -40 ~ 85 | -40 ~ 85 | 0 ~ 70 | 0 ~ 70 | 0 ~ 70 |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| MSL Level | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
AD648 Series (J-FET Amplifiers):
The AD648JRZ, AD648JRZ-REEL, AD648JRZ-REEL7, and AD648KRZ maintain J-FET amplifier architecture and dual-channel configuration in identical 8-SOIC packaging. All variants are ROHS3 compliant with MSL Level 1 rating. These parts operate within the LF253DT maximum supply voltage specification (36V) but require minimum supply voltage of 9V, restricting use in applications operating below this threshold. The AD648 series exhibits significantly reduced slew rate and gain bandwidth product compared to the LF253DT. Selection of AD648 variants is appropriate only when application bandwidth and slew rate requirements are compatible with 1 MHz gain bandwidth product and 1.8V/µs slew rate specifications. The AD648KRZ variant offers improved input offset voltage (300 µV) and input bias current (3 pA) relative to AD648JRZ variants (750 µV and 5 pA respectively).
AD706 Series (General Purpose Amplifiers):
The AD706 series comprises general-purpose amplifiers classified distinctly from J-FET architecture. While these parts maintain dual-channel configuration and 8-SOIC packaging, they are not functionally equivalent to the LF253DT. The AD706 series operates across a wider minimum supply voltage range (4V to 36V) but exhibits substantially lower performance metrics: 0.15V/µs slew rate and 800 kHz gain bandwidth product. Selection of AD706 variants is restricted to applications where general-purpose amplifier characteristics and reduced performance specifications are acceptable. Temperature range variants exist: AD706ARZ and AD706ARZ-REEL7 support -40°C to 85°C operation, while AD706JRZ and AD706JRZ-REEL variants operate from 0°C to 70°C.
Packaging Considerations:
Tube packaging (AD648JRZ, AD648KRZ, AD706ARZ, AD706JRZ) differs from Cut Tape (CT) & Digi-Reel® packaging (LF253DT, AD648JRZ-REEL7, AD706ARZ-REEL, AD706ARZ-REEL7, AD706JRZ-REEL, AD706JRZ-REEL7). Component procurement and assembly processes must account for packaging format compatibility.
Frequently Asked Questions (FAQ)
Q: Can the AD648 series directly replace the LF253DT in all applications?
A: No. While the AD648 series maintains J-FET amplifier architecture and identical package configuration, the reduced slew rate (1.8V/µs versus 16V/µs) and lower gain bandwidth product (1 MHz versus 4 MHz) restrict substitution to applications where these performance reductions are acceptable. Additionally, the AD648 series requires minimum 9V supply voltage, whereas the LF253DT operates from 6V minimum.
Q: What is the primary difference between AD648 and AD706 series?
A: The AD648 series is classified as J-FET amplifiers, maintaining the same amplifier type as the LF253DT. The AD706 series comprises general-purpose amplifiers with different internal architecture. While both maintain dual-channel 8-SOIC configuration, the AD706 series exhibits significantly lower slew rate (0.15V/µs) and gain bandwidth product (800 kHz), making it unsuitable for applications requiring J-FET performance characteristics.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed (AD648 and AD706 series) maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the LF253DT specifications.
Q: What packaging options are available for substitute parts?
A: Substitute parts are available in Tube packaging (AD648JRZ, AD648KRZ, AD706ARZ, AD706JRZ) and Cut Tape (CT) & Digi-Reel® packaging (AD648JRZ-REEL, AD648JRZ-REEL7, AD706ARZ-REEL, AD706ARZ-REEL7, AD706JRZ-REEL, AD706JRZ-REEL7). The LF253DT is supplied in Cut Tape (CT) & Digi-Reel® format. Packaging selection must align with assembly process requirements.
Q: Which AD648 variant offers the best input offset voltage performance?
A: The AD648KRZ variant specifies 300 µV input offset voltage, compared to 750 µV for AD648JRZ variants. The AD648KRZ also provides superior input bias current (3 pA versus 5 pA). However, all AD648 variants maintain identical slew rate and gain bandwidth product specifications.
Q: Can the LF253DT be used in applications requiring operation below 9V supply voltage?
A: Yes. The LF253DT operates from 6V minimum supply voltage. The AD648 series, with 9V minimum supply requirement, cannot substitute in applications operating below 9V. The AD706 series supports 4V minimum supply voltage but exhibits general-purpose amplifier characteristics rather than J-FET performance.
Q: What is the operating temperature range difference between LF253DT and substitute parts?
A: The LF253DT operates from -40°C to 105°C. The AD648 series operates from 0°C to 70°C, restricting use in extended low-temperature applications. The AD706ARZ and AD706ARZ-REEL7 support -40°C to 85°C operation, while AD706JRZ variants operate from 0°C to 70°C.
Q: Are there differences in output current capability between the LF253DT and substitute parts?
A: Yes. The LF253DT specifies 40 mA output current per channel, while all substitute parts (AD648 and AD706 series) specify 15 mA per channel. Applications requiring higher output current cannot use these substitute parts.
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