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Analog Devices Inc. LT1457ACN8#PBF
- Part No.:
- LT1457ACN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1457ACN8#PBF.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:300
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Product details
Overview
LT1457ACN8#PBF from Analog Devices (formerly Linear Technology) is a dual, precision JFET-input operational amplifier optimized for driving large capacitive loads up to 10,000 pF while maintaining low offset voltage (450 µV max), low input bias current (50 pA at 70°C), and high channel separation (130 dB). It serves as a unity-gain stable buffer in precision analog front-ends for data acquisition systems.
For engineers reviewing the LT1457ACN8#PBF datasheet, LT1457ACN8#PBF pinout, LT1457ACN8#PBF application, or LT1457ACN8#PBF equivalent, key selection criteria include capacitive load drive capability, 13 nV/√Hz voltage noise density at 1 kHz, ±20 V supply range, 4 V/µs slew rate, and 1.7 MHz gain-bandwidth product under ±15 V operation.
Technical Context
The LT1457ACN8#PBF employs JFET input stages with >1012 Ω differential and common-mode input resistance, enabling ultra-low bias current performance critical for photodiode and high-impedance sensor interfaces. Its internal phase-reversal protection circuit prevents output inversion when inputs exceed negative common-mode limits - a failure mode present in legacy JFET op amps like LF412.
It achieves stable operation into 10 nF loads without external compensation due to high phase margin (>80° at 10 pF, >51° at 1000 pF), and its 4 µV/°C offset drift and 130 dB channel separation support dual-channel precision signal conditioning where crosstalk and thermal drift must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 450 µV max (AC grade, N8 package) - ensures ≤0.5 mV total error in 12-bit systems with ±10 V full-scale |
| Slew Rate | 4 V/µs - supports ≥100 kHz full-power bandwidth for 40 VPP signals |
| Voltage Noise Density | 13 nV/√Hz at 1 kHz - enables sub-10 µV RMS noise in 10 Hz–10 kHz audio/DAQ bands |
| Capacitive Load Drive | 10,000 pF - eliminates need for isolation resistors when driving ADC sample-hold capacitors or long cables |
| Channel Separation | 130 dB (DC–5 kHz) - limits crosstalk to <1 µV in dual-channel simultaneous-sampling applications |
| Supply Voltage Range | ±20 V - accommodates industrial ±15 V rails with 5 V headroom for transient margin |
| Input Bias Current | 50 pA at 70°C - preserves signal integrity in >100 MΩ source impedance circuits (e.g., piezoelectric sensors) |
Pinout & Package
LT1457ACN8#PBF is housed in an 8-lead plastic DIP (N8) package with 0.300-inch body width and through-hole mounting. Pin 1 is marked with a notch or dot; leads are tin-lead plated with 300°C soldering tolerance for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input A | High-impedance JFET node for feedback network connection; requires guard ring in PCB layout for <1 pA leakage |
| 2 | Non-inverting Input A | Reference point for A-channel; matched to Pin 1 for CMRR optimization |
| 3 | Positive Supply (V+) | Common rail for both amplifiers; decoupling capacitor required within 10 mm of Pin 3 |
| 4 | Output A | Class-AB output stage capable of ±13 V swing into 2 kΩ; drives 10 nF directly |
| 5 | Output B | Independent output stage; 130 dB isolation from Output A minimizes inter-channel coupling |
| 6 | Negative Supply (V−) | Return path for both amplifiers; separate ground plane recommended beneath Pins 3 and 6 |
| 7 | Inverting Input B | Matched to Pin 1; identical bias current and offset specs enable differential pair configurations |
| 8 | Non-inverting Input B | Complementary input for B-channel; same layout rules apply as Pin 2 |
Key Features
| Feature | Design Value |
|---|---|
| Phase reversal protection | Prevents output inversion when inputs drop below –12 V (±15 V supplies), eliminating servo lock-up in closed-loop systems |
| 10,000 pF capacitive load drive | Enables direct connection to ADC hold capacitors (e.g., LTC1274) without series resistor or stability compromises |
| 130 dB channel separation | Reduces inter-channel interference to <1 µV in dual-sensor monitoring, supporting simultaneous sampling accuracy |
| 4 µV/°C offset drift | Limits temperature-induced error to <0.3 mV over –40°C to 85°C, critical for uncalibrated industrial sensors |
| 13 nV/√Hz noise density | Supports 16-bit effective resolution in 10 Hz–1 kHz bandwidths without external filtering |
Applications
| Sample-and-Hold Circuits | A/D and D/A Converters |
|---|---|
Use Scenario: Driving 10–100 nF hold capacitors in precision SAR ADC front-ends (e.g., LTC1864) with minimal settling error. IC Role / Device Role / Timing Role: Unity-gain buffer isolating switch capacitance from amplifier output; maintains linearity during acquisition phase. Use Value: 10,000 pF drive capability eliminates series resistor, preserving SNR and reducing acquisition time by >30% vs. uncompensated op amps. | Use Scenario: Buffering reference voltage and scaling DAC outputs in programmable logic controller (PLC) analog output modules. IC Role / Device Role / Timing Role: Precision gain-setting stage with matched channels for bipolar ±10 V output generation. Use Value: 450 µV max VOS and 4 µV/°C drift ensure <0.01% FSR error across industrial temperature range without calibration. |
| Photodiode Amplifiers | Voltage-to-Frequency Converters |
Use Scenario: Transimpedance amplification of low-current photodiode signals (<100 pA) in optical smoke detectors. IC Role / Device Role / Timing Role: High-Z current-to-voltage converter with guarded input traces minimizing leakage paths. Use Value: 50 pA input bias current at 70°C prevents >5 mV offset error in 50 MΩ transimpedance gain configurations. | Use Scenario: Linear V/F conversion in isolated energy metering front-ends where output frequency must track input voltage with <0.1% gain error. IC Role / Device Role / Timing Role: Precision integrator core with matched dual channels enabling differential V/F architectures. Use Value: 130 dB channel separation suppresses common-mode ripple on integrator output, improving frequency linearity by 0.05%. |
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 only rated for 100 pF load; 2× higher input bias current (100 pA at 70°C) | Preferred for wideband active filters; unsuitable for direct 10 nF ADC buffering | Select when bandwidth >1 MHz is required and capacitive load <100 pF |
| OPA2134PA | Lower noise (8 nV/√Hz), wider GBW (8 MHz), but no phase reversal protection; max 100 pF load rating | Better for audio preamps; lacks robustness in overvoltage-prone sensor interfaces | Choose for low-noise audio or instrumentation where input common-mode excursions are controlled |
Compared with LT1057CN8#PBF and OPA2134PA, the LT1457ACN8#PBF trades bandwidth and noise for unparalleled capacitive load immunity and fault-tolerant input behavior - making it uniquely suited for unbuffered ADC drivers and high-impedance sensor conditioning where stability and reliability outweigh raw speed.
Availability
LT1457ACN8#PBF is available at Aetrix Electronics and suitable for precision data acquisition, industrial sensor signal conditioning, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1457ACN8#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, Inc. (including legacy Linear Technology products) designs high-performance analog, mixed-signal, and digital signal processing ICs for precision measurement, power management, and signal chain applications.
The LT1457ACN8#PBF belongs to Linear Technology's precision JFET op amp family, engineered specifically for applications demanding ultra-low input current, high capacitive load drive, and immunity to phase reversal - targeting industrial DAQ, test equipment, and sensor interface systems.
FAQ
What is the maximum capacitive load the LT1457ACN8#PBF can drive without oscillation?
The LT1457ACN8#PBF is characterized to drive up to 10,000 pF capacitive loads stably in unity-gain configuration, as verified in Figure TPC20 of the official datasheet. This capability eliminates external isolation resistors in sample-and-hold and ADC driver applications. Stability is maintained across –40°C to 85°C with proper power supply decoupling and PCB layout per Linear Technology's guidelines. The LT1457ACN8#PBF achieves this via high phase margin design, not external compensation.
Does the LT1457ACN8#PBF have phase reversal protection, and how does it compare to older JFET op amps?
Yes, the LT1457ACN8#PBF incorporates proprietary phase reversal protection that prevents output inversion when inputs exceed the negative common-mode limit (e.g., below –12 V with ±15 V supplies). Unlike legacy JFET op amps such as LF412 or TL084 - which exhibit destructive phase reversal under the same conditions - the LT1457ACN8#PBF maintains correct polarity. This feature is critical in servo loops and closed-loop sensor systems where phase reversal could cause system lock-up. The LT1457ACN8#PBF implements this via internal clamping circuitry, not external components.
What is the input offset voltage specification for the LT1457ACN8#PBF, and how is it tested?
The LT1457ACN8#PBF has a maximum input offset voltage of 450 µV at 25°C for the AC grade in the N8 package, as specified in the "ELECTRICAL CHARACTERISTICS" table under LT1457AC/C conditions. This value is guaranteed over the full operating temperature range (–40°C to 85°C) with a typical drift of 4 µV/°C. Testing follows Linear Technology's standard methodology: 100% production testing at 25°C, with full-range specifications guaranteed by correlation to 0°C, 25°C, and 70°C data. The LT1457ACN8#PBF's offset distribution is shown in Figure TPC04, confirming tight Gaussian spread centered near 0 µV.
Can the LT1457ACN8#PBF operate from a single supply, and what are the limitations?
The LT1457ACN8#PBF is specified for dual-supply operation (±20 V absolute max), and its input common-mode range extends to the rails (±10.5 V min swing with ±15 V supplies). While it can function with a single +30 V supply and ground, the input and output voltage ranges become asymmetric: the input common-mode range is limited to 0 V to +14.3 V, and output swing is reduced to +12 V to +13 V (vs. rail). For true rail-to-rail input/output, a different amplifier family is recommended. The LT1457ACN8#PBF's design prioritizes precision and capacitive load drive over single-supply flexibility.
How does the LT1457ACN8#PBF's channel separation performance impact dual-channel applications?
The LT1457ACN8#PBF delivers 130 dB channel separation from DC to 5 kHz, meaning crosstalk between Channel A and Channel B is attenuated by a factor of 1013. In practice, this limits interference to <1 µV when one channel handles a 10 VPP signal - essential for simultaneous-sampling dual ADCs or differential sensor pairs. This performance stems from optimized die layout and independent output stages, not just process matching. The LT1457ACN8#PBF's separation remains stable across temperature and supply voltage, unlike many dual op amps where crosstalk degrades above 1 kHz.
LT1457ACN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 5 pA
- Voltage - Input Offset:
- 150 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1457ACN8#PBF FAQ
1.How can I place an order for LT1457ACN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1457ACN8#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 LT1457ACN8#PBF reliable?
The price and inventory of LT1457ACN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1457ACN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1457ACN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1457ACN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1457ACN8#PBF?
LT1457ACN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1457ACN8#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 LT1457ACN8#PBF?
For technical support, including LT1457ACN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1457ACN8#PBF requirements.
6.How does Aetrix verify that LT1457ACN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1457ACN8#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 LT1457ACN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1457ACN8#PBF?
All LT1457ACN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1457ACN8#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 LT1457ACN8#PBF part is unused and in its original packaging.
Return procedure for LT1457ACN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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