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Analog Devices Inc. LT1457S8#PBF
- Part No.:
- LT1457S8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1457S8#PBF.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,143
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Product details
Overview
LT1457S8#PBF from Analog Devices (formerly Linear Technology) is a dual, precision JFET-input operational amplifier engineered for stable operation with large capacitive loads up to 10,000 pF while maintaining low offset voltage (1200 µV max in S8 package), 4 V/µs slew rate, and 13 nV/√Hz input voltage noise density. It serves as a unity-gain-stable buffer or precision gain stage in high-impedance signal conditioning paths such as photodiode amplifiers and sample-and-hold circuits.
For engineers reviewing the LT1457S8#PBF datasheet, LT1457S8#PBF pinout, LT1457S8#PBF application, or LT1457S8#PBF equivalent, key selection criteria include verified capacitive load drive capability, JFET-input bias current ≤50 pA at 70°C, channel separation ≥130 dB, and SOIC-8 package compatibility with industrial temperature range (–40°C to 85°C).
Technical Context
The LT1457S8#PBF employs a proprietary phase reversal protection circuit that prevents output inversion when inputs exceed the negative common-mode limit-unlike standard JFET op amps (e.g., LF412). Its internal compensation ensures unity-gain stability even with 10 nF loads, eliminating need for external isolation resistors in capacitive-drive applications.
It features matched dual amplifiers with differential input resistance ≥1012 Ω, common-mode rejection ratio ≥86 dB over ±10.5 V range, and power supply rejection ratio ≥88 dB-enabling high-accuracy DC-coupled measurements in noisy industrial environments without additional filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 1200 µV max (S8 package); enables sub-mV DC accuracy in 12-bit systems without trimming |
| Slew Rate | 4 V/µs; supports 100 kHz full-power bandwidth into 2 kΩ load |
| Capacitive Load Drive | 10,000 pF; eliminates need for external series resistor when driving ADC hold capacitors |
| Input Bias Current | 50 pA at 70°C; preserves signal integrity in >1 GΩ source impedance photodiode interfaces |
| Voltage Noise Density | 13 nV/√Hz at 1 kHz; suitable for low-frequency precision amplification with <1 µV RMS noise in 10 Hz–10 kHz band |
| Channel Separation | 130 dB (DC–5 kHz); prevents crosstalk between dual channels in simultaneous-sampling data acquisition |
| Supply Voltage Range | ±20 V; accommodates wide dynamic range sensors and legacy ±15 V industrial rails |
Pinout & Package
LT1457S8#PBF is housed in an 8-lead plastic SOIC (S8) package per JEDEC MS-012, with industry-standard pinout matching LT1013DS8. Thermal resistance θJA = 190°C/W; maximum junction temperature = 130°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V− | Negative supply rail connection; must be decoupled within 1 cm of pin for stability with large capacitive loads |
| 2 | +IN B | Non-inverting input of Channel B; high-impedance JFET node (≥10¹² Ω) |
| 3 | −IN A | Inverting input of Channel A; referenced to feedback network in transimpedance configurations |
| 4 | +IN A | Non-inverting input of Channel A; used in unity-gain follower or non-inverting amplifier topologies |
| 5 | OUT A | Output of Channel A; capable of ±12 V swing into 2 kΩ with <0.1% THD |
| 6 | −IN B | Inverting input of Channel B; isolated from Channel A by ≥130 dB inter-channel coupling |
| 7 | V+ | Positive supply rail connection; requires local 0.1 µF ceramic decoupling capacitor |
| 8 | OUT B | Output of Channel B; independently buffered; no shared output stage with Channel A |
Key Features
| Feature | Design Value |
|---|---|
| Phase reversal protection | Prevents output inversion when inputs drop below –12 V (±15 V supplies), avoiding servo lock-up in closed-loop systems |
| Unity-gain stable with 10 nF load | Eliminates need for external isolation resistors in sample-and-hold and DAC output buffering |
| Low 1/f noise corner | 28 Hz corner frequency enables stable DC-coupled operation in precision weighing and strain gauge bridges |
| Matched dual architecture | Guarantees ≤10 µV offset mismatch between channels for differential measurement accuracy |
| High CMRR at elevated frequencies | Maintains ≥84 dB common-mode rejection up to 100 kHz, critical for motor current sensing in noisy PWM environments |
Applications
| Sample-and-Hold Circuits | Photodiode Amplifiers |
|---|---|
Use Scenario: Driving 1000–10,000 pF hold capacitors in high-resolution data acquisition systems requiring minimal droop and settling time. IC Role / Device Role / Timing Role: Unity-gain buffer with guaranteed stability and low output impedance (<100 Ω) during hold phase. Use Value: Enables direct connection to ADC input without series resistor, preserving SNR and reducing component count. | Use Scenario: Converting weak photocurrents (pA–nA) from scientific-grade photodiodes into measurable voltage signals. IC Role / Device Role / Timing Role: Transimpedance amplifier with ultra-low input bias current (50 pA at 70°C) and low voltage noise. Use Value: Achieves >120 dB dynamic range in optical spectroscopy systems without active bias cancellation. |
| A/D and D/A Converters | Voltage-to-Frequency Converters |
Use Scenario: Buffering DAC outputs in programmable power supply control loops where output capacitance exceeds 1000 pF. IC Role / Device Role / Timing Role: Low-drift output driver ensuring monotonicity and linearity across full temperature range. Use Value: Maintains 16-bit monotonicity without external compensation, reducing calibration overhead. | Use Scenario: Generating precise frequency outputs proportional to analog input voltage in industrial process controllers. IC Role / Device Role / Timing Role: Precision integrator core with low input offset drift (4 µV/°C) and high open-loop gain (≥100 V/mV). Use Value: Delivers <0.01% full-scale error over –40°C to 85°C without trim potentiometers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual JFET-input op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1057CN8#PBF | 3× higher slew rate (12 V/µs) but limited to 100 pF capacitive load drive; 10× higher input bias current (500 pA at 70°C) | Better for high-speed pulse amplification; unsuitable for sample-and-hold or photodiode buffers with >100 pF load | Select only when speed outweighs capacitive drive requirement and source impedance <100 MΩ |
| LT1113CS8#PBF | Lower voltage noise (4.5 nV/√Hz) but no phase reversal protection; 10× higher input bias current (500 pA at 70°C); not unity-gain stable with >100 pF | Preferred for low-noise audio preamps; cannot replace LT1457S8#PBF in phase-critical servo or sensor interfaces | Choose only for low-noise AC-coupled applications where DC accuracy and phase safety are secondary |
Compared with LT1057CN8#PBF and LT1113CS8#PBF, the LT1457S8#PBF uniquely combines robust capacitive load handling, phase reversal immunity, and sub-100 pA bias current-making it irreplaceable in precision DC-coupled, high-impedance, or safety-critical analog front-ends.
Availability
LT1457S8#PBF is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, and test equipment requiring stable component supply with guaranteed long-term availability and traceable lot history.
Supply support for LT1457S8#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains full product continuity, manufacturing, and technical support for all Linear op amp families including the LT1457 series.
The LT1457 product line was designed specifically for dual-channel, precision JFET-input applications demanding exceptional capacitive load drive, phase reversal immunity, and low drift-targeting high-reliability industrial and instrumentation markets.
FAQ
What is the maximum capacitive load the LT1457S8#PBF can drive without oscillation?
The LT1457S8#PBF is characterized for stable unity-gain operation with up to 10,000 pF capacitive load, as confirmed in the manufacturer's Typical Performance Characteristics (TPC20). This capability is enabled by internal compensation and does not require external isolation resistors-unlike most JFET op amps. For loads exceeding 10 nF, layout optimization (short traces, ground plane) remains essential to preserve phase margin.
Does the LT1457S8#PBF have phase reversal protection, and how does it compare to standard JFET op amps?
Yes, the LT1457S8#PBF incorporates a unique phase reversal protection circuit that prevents output inversion when inputs fall below the negative common-mode limit (e.g., <–12 V with ±15 V supplies). Standard JFET op amps like LF412 exhibit phase reversal under these conditions, risking servo lock-up. The LT1457S8#PBF avoids this failure mode entirely, making it suitable for fault-tolerant industrial control loops.
What is the input bias current specification for LT1457S8#PBF at 70°C, and why does it matter for photodiode applications?
The LT1457S8#PBF specifies 50 pA maximum input bias current at 70°C. In photodiode amplifier configurations, this low bias current minimizes dark-current-induced offset errors and preserves signal fidelity when interfacing with high-impedance (>1 GΩ) sources. Higher bias currents (e.g., 500 pA in LT1113) would degrade dynamic range and introduce temperature-dependent drift in optical sensing systems.
Is the LT1457S8#PBF pin-compatible with other SOIC-8 dual op amps like the LT1013 or OP2177?
No-the LT1457S8#PBF uses the industry-standard LT1013DS8 SOIC-8 pinout (V−, +IN B, −IN A, +IN A, OUT A, −IN B, V+, OUT B), which differs from generic "pin 1 = OUT A" conventions. While compatible with LT1013 layouts, it is not pin-compatible with OP2177 (which follows different pin mapping). Always verify PCB footprint against the S8 package drawing before board reuse.
What is the guaranteed input offset voltage drift over temperature for LT1457S8#PBF?
The LT1457S8#PBF guarantees an average temperature coefficient of input offset voltage of 4 µV/°C maximum over the full –40°C to +85°C operating range. This low drift ensures predictable performance in unregulated thermal environments-critical for applications like strain gauge bridges or thermocouple amplifiers where ambient temperature swings exceed 40°C.
LT1457S8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 4V/µs
- Gain Bandwidth Product:
- 1.7 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 7 pA
- Voltage - Input Offset:
- 220 µV
- Current - Supply:
- 1.8mA (x2 Channels)
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1457S8#PBF FAQ
1.How can I place an order for LT1457S8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1457S8#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT1457S8#PBF reliable?
The price and inventory of LT1457S8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1457S8#PBF is usually 5 days.
3.What payment methods are accepted for LT1457S8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1457S8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1457S8#PBF?
LT1457S8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1457S8#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT1457S8#PBF?
For technical support, including LT1457S8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1457S8#PBF requirements.
6.How does Aetrix verify that LT1457S8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1457S8#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT1457S8#PBF meets industry standards.
7.What is the process for return or replacement of LT1457S8#PBF?
All LT1457S8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1457S8#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT1457S8#PBF part is unused and in its original packaging.
Return procedure for LT1457S8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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