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LF347M/NOPB Equivalent & Substitute Parts
Part Overview
The LF347M/NOPB is a J-FET operational amplifier manufactured by Texas Instruments, featuring four independent amplifier circuits in a 14-SOIC surface mount package. This device is classified as Active product status and is ROHS3 compliant. The LF347M/NOPB operates across a supply voltage range of 10V to 36V with a slew rate of 13V/µs and gain bandwidth product of 4 MHz. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory availability, packaging format preferences, or specific application constraints.
Substiute Parts
Key Parameters
| Parameter | LF347M/NOPB | Unit |
|---|---|---|
| Amplifier Type | J-FET | — |
| Number of Circuits | 4 | — |
| Slew Rate | 13 | V/µs |
| Gain Bandwidth Product | 4 | MHz |
| Current - Input Bias | 50 | pA |
| Voltage - Input Offset | 5 | mV |
| Current - Supply (x4 Channels) | 7.2 | mA |
| Voltage - Supply Span (Min) | 10 | V |
| Voltage - Supply Span (Max) | 36 | V |
| Operating Temperature | 0 to 70 | °C |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitute parts for the LF347M/NOPB are classified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:
Critical Matching Parameters:
- Amplifier Type: J-FET (all substitutes must be J-FET topology)
- Number of Circuits: 4 independent amplifier circuits
- Package / Case: 14-SOIC form factor (0.154", 3.90mm Width)
- Mounting Type: Surface Mount
- RoHS Status: ROHS3 Compliant
Allowable Variation Parameters:
- Slew Rate: 13V/µs or higher
- Gain Bandwidth Product: 3 MHz or higher
- Current - Input Bias: 50 pA or lower
- Voltage - Input Offset: 5 mV or lower
- Current - Supply: 8 mA or lower per channel group
- Voltage - Supply Span: Minimum 10V, Maximum 36V or higher
- Operating Temperature: 0°C to 70°C or extended range
Substitutes are grouped into two categories: Texas Instruments LF347 series variants (packaging format differences), Texas Instruments TL084 series (enhanced performance characteristics), STMicroelectronics LF347/LF247 series (cross-manufacturer equivalents), and Analog Devices ADA4000 series (premium performance alternative).
Parameter Comparison
| Part Number | Manufacturer | Slew Rate (V/µs) | GBW (MHz) | Input Bias (pA) | Input Offset (mV) | Supply Current (mA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Packaging | Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| LF347M/NOPB | Texas Instruments | 13 | 4 | 50 | 5 | 7.2 | 10 | 36 | 0 to 70 | Tube | Active |
| LF347BDR | Texas Instruments | 13 | 3 | 50 | 3 | 8 | 7 | 36 | 0 to 70 | Tape & Reel | Active |
| LF347DR | Texas Instruments | 13 | 3 | 50 | 5 | 8 | 7 | 36 | 0 to 70 | Cut Tape & Digi-Reel | Active |
| TL084ACDR | Texas Instruments | 13 | 3 | 30 | 3 | 1.4 | 10 | 30 | 0 to 70 | Cut Tape & Digi-Reel | Active |
| LF347D | STMicroelectronics | 16 | 3 | 20 | 3 | 1.4 | 44 | 44 | 0 to 70 | Tube | Active |
| ADA4000-4ARZ | Analog Devices Inc. | 20 | 5 | 5 | 0.2 | 1.35 | 8 | 36 | -40 to 125 | Tube | Active |
| ADA4000-4ARZ-R7 | Analog Devices Inc. | 20 | 5 | 5 | 0.2 | 1.35 | 8 | 36 | -40 to 125 | Cut Tape & Digi-Reel | Active |
| LF247DT | STMicroelectronics | 16 | 4 | 20 | 3 | 1.4 | 44 | 44 | -40 to 105 | Tape & Reel | Active |
| LF347BD | Texas Instruments | 13 | 3 | 50 | 3 | 8 | 7 | 36 | 0 to 70 | Tube | Obsolete |
| LF347DT | STMicroelectronics | 16 | 4 | 20 | 3 | 1.4 | 44 | 44 | 0 to 70 | Cut Tape & Digi-Reel | Active |
Engineering Selection Recommendations
Primary Substitutes (Texas Instruments LF347 Series):
LF347BDR, LF347DR, and LF347BD maintain identical J-FET amplifier topology and 14-SOIC packaging as the LF347M/NOPB. These parts differ only in packaging format (Tape & Reel, Cut Tape & Digi-Reel, or Tube) and minor electrical parameter variations within acceptable tolerances. LF347BDR and LF347DR are Active status products with high inventory availability. LF347BD is classified as Obsolete and should not be selected for new designs. All three are ROHS3 compliant and suitable for direct substitution in existing applications.
Secondary Substitutes (Texas Instruments TL084 Series):
TL084ACDR provides enhanced performance with reduced input bias current (30 pA versus 50 pA) and lower supply current consumption (1.4 mA versus 7.2 mA). The maximum supply voltage is limited to 30V compared to 36V for the LF347M/NOPB. TL084ACDR is Active status and ROHS3 compliant. This substitute is appropriate when lower power consumption is a design requirement and the 30V maximum supply voltage is compatible with the application.
Cross-Manufacturer Substitutes (STMicroelectronics LF347/LF247 Series):
LF347D, LF347DT, and LF247DT are STMicroelectronics equivalents featuring improved slew rate (16V/µs) and lower input bias current (20 pA). These parts operate at a fixed supply voltage of 44V (symmetric ±22V), which differs from the LF347M/NOPB variable supply range. LF347DT and LF247DT are Active status with substantial inventory. LF247DT extends the operating temperature range to -40°C to 105°C. All are ROHS3 compliant. These substitutes are suitable when the 44V supply voltage specification aligns with application requirements.
Premium Alternative (Analog Devices ADA4000 Series):
ADA4000-4ARZ and ADA4000-4ARZ-R7 represent premium performance alternatives with superior specifications: 20V/µs slew rate, 5 MHz gain bandwidth product, 5 pA input bias current, and 200 µV input offset voltage. Operating temperature range extends to -40°C to 125°C. Both variants are Active status and ROHS3 compliant. These substitutes are appropriate for applications requiring enhanced precision, extended temperature operation, or superior dynamic performance. Packaging differs (Tube versus Cut Tape & Digi-Reel).
Compliance and Certification:
All recommended substitutes maintain ROHS3 compliance, MSL Level 1 (Unlimited moisture sensitivity), REACH Unaffected status, and EAR99 ECCN classification, matching the LF347M/NOPB regulatory profile.
Frequently Asked Questions (FAQ)
Q: Can LF347DR be used as a direct replacement for LF347M/NOPB?
A: Yes. LF347DR is a direct electrical and mechanical equivalent. Both are J-FET quad operational amplifiers in 14-SOIC packaging with identical slew rate (13V/µs) and compatible electrical specifications. The difference is packaging format: LF347M/NOPB is supplied in Tube, while LF347DR is supplied in Cut Tape & Digi-Reel format. Electrical performance is equivalent.
Q: What is the key difference between LF347 and TL084 series?
A: The TL084ACDR offers lower input bias current (30 pA versus 50 pA) and significantly reduced supply current consumption (1.4 mA versus 7.2 mA). However, the maximum supply voltage is limited to 30V compared to 36V for the LF347M/NOPB. Select TL084ACDR when power consumption reduction is critical and the application operates within the 30V maximum supply specification.
Q: Are STMicroelectronics LF347D and LF347DT compatible with LF347M/NOPB?
A: Both are mechanically and functionally compatible in 14-SOIC packaging with J-FET quad amplifier topology. However, they operate at a fixed 44V supply voltage (±22V symmetric), whereas LF347M/NOPB accepts variable supply from 10V to 36V. Verify that your application can accommodate the 44V supply specification before substitution.
Q: When should ADA4000-4ARZ be selected over LF347M/NOPB?
A: Select ADA4000-4ARZ when the application requires superior performance specifications: higher slew rate (20V/µs), higher gain bandwidth product (5 MHz), significantly lower input bias current (5 pA), or extended operating temperature range (-40°C to 125°C). ADA4000-4ARZ is a premium alternative suitable for precision instrumentation and wide-temperature applications.
Q: Is LF347BD still available for new designs?
A: No. LF347BD is classified as Obsolete product status. Do not select this part for new designs. Use Active status alternatives such as LF347BDR or LF347DR instead.
Q: What packaging formats are available for LF347 substitutes?
A: LF347M/NOPB is supplied in Tube packaging. Equivalent parts are available in Tube, Tape & Reel (TR), and Cut Tape & Digi-Reel formats. Packaging format does not affect electrical performance; selection depends on assembly process requirements and inventory management preferences.
Q: Do all substitutes maintain ROHS3 compliance?
A: Yes. All recommended substitute parts are ROHS3 compliant, matching the LF347M/NOPB regulatory status. All maintain MSL Level 1 (Unlimited), REACH Unaffected, and EAR99 ECCN classification.
Q: Can LF247DT replace LF347M/NOPB in applications requiring extended temperature operation?
A: LF247DT extends the operating temperature range to -40°C to 105°C compared to 0°C to 70°C for LF347M/NOPB. However, LF247DT operates at fixed 44V supply voltage. Substitution is valid only if the application requires extended low-temperature operation and can accommodate the 44V supply specification.
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