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Analog Devices Inc. LT1457CN8#PBF
- Part No.:
- LT1457CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1457CN8#PBF.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:289
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Product details
Overview
LT1457CN8#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 low voltage noise (13 nV/√Hz). It serves as a high-stability buffer and signal conditioner in precision analog front-ends requiring phase-reversal immunity and rail-to-rail common-mode input range.
For engineers reviewing the LT1457CN8#PBF datasheet, LT1457CN8#PBF pinout, LT1457CN8#PBF application, or LT1457CN8#PBF equivalent, key selection criteria include capacitive load drive capability, input offset drift (4 µV/°C), channel separation (130 dB), slew rate (4 V/µs), and N8-package thermal resistance (θJA = 130°C/W).
Technical Context
The LT1457CN8#PBF employs a proprietary JFET input stage with phase-reversal protection circuitry that prevents output inversion when inputs exceed negative common-mode limits - a critical reliability feature absent in legacy JFET op amps like LF412. Its internal compensation ensures stable unity-gain operation into 10 nF loads without external compensation.
It delivers 130 dB channel separation from DC to 5 kHz and maintains 1200 µV max input offset voltage in the N8 package across –40°C to 85°C, with supply current per amplifier tightly specified at 1.8–3.0 mA under ±15 V supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 450 µV max (plastic DIP package); enables sub-mV error budgets in 16-bit ADC driver circuits |
| Slew Rate | 4 V/µs; supports ≥100 kHz full-power bandwidth into 2 kΩ loads |
| Capacitive Load Drive | 10,000 pF; eliminates need for isolation resistors when driving sample-and-hold capacitors or long cables |
| Voltage Noise Density | 13 nV/√Hz at 1 kHz; suitable for low-noise photodiode amplification with >100 dB SNR |
| Channel Separation | 130 dB (DC–5 kHz); prevents crosstalk in dual-channel instrumentation and A/D converter front-ends |
| Input Bias Current | 50 pA at 70°C; preserves accuracy in high-impedance sensor interfaces (e.g., pH electrodes) |
| Common-Mode Range | ±10.5 V on ±15 V supplies; allows direct interfacing to bipolar sensors without level-shifting |
Pinout & Package
LT1457CN8#PBF is housed in an 8-lead plastic DIP (N8) package with JEDEC MS-001AC outline, 0.300" wide body, and through-hole mounting. Thermal resistance θJA = 130°C/W enables reliable operation at ambient temperatures up to 85°C with minimal heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input A | High-impedance JFET input node for Channel A; accepts common-mode voltages from –11 V to +8 V |
| 2 | Non-inverting Input A | High-impedance JFET input node for Channel A; matched to Pin 1 for low offset current |
| 3 | Positive Supply (V+) | Connects to +15 V (max ±20 V); powers both amplifiers and sets upper common-mode limit |
| 4 | Inverting Input B | High-impedance JFET input node for Channel B; electrically isolated from Channel A by 130 dB |
| 5 | Non-inverting Input B | High-impedance JFET input node for Channel B; identical specs to Pin 2 |
| 6 | Output B | Class AB output stage capable of ±13 V swing into 2 kΩ; drives 10 nF loads without oscillation |
| 7 | Negative Supply (V–) | Connects to –15 V (max ±20 V); defines lower common-mode and output swing limits |
| 8 | Output A | Class AB output stage identical to Pin 6; fully independent channel with no shared internal nodes |
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 large hold capacitors in sample-and-hold circuits without stability-compensation networks |
| 130 dB channel separation | Minimizes inter-channel crosstalk in dual-sensor measurement systems operating up to 5 kHz |
| 4 µV/°C offset drift | Ensures <100 µV total offset variation over –40°C to +85°C, critical for uncalibrated industrial temperature ranges |
| JFET input stage (50 pA @ 70°C) | Supports ultra-high source impedances (>1 GΩ) in photodiode and piezoelectric sensor interfaces |
Applications
| Sample-and-Hold Circuits | A/D and D/A Converters |
|---|---|
Use Scenario: Driving 10 nF hold capacitors in precision data acquisition systems with 16-bit resolution. IC Role / Device Role / Timing Role: Unity-gain buffer with phase-reversal immunity and low charge injection during sampling. Use Value: Eliminates need for series isolation resistors, preserving settling time and reducing component count. | Use Scenario: Buffering reference voltages and scaling analog outputs in multi-channel DAC systems. IC Role / Device Role / Timing Role: Dual-channel precision voltage follower isolating DAC outputs from varying load capacitance. Use Value: Maintains monotonicity and linearity by preventing crosstalk-induced gain errors between channels. |
| Photodiode Amplifiers | Voltage-to-Frequency Converters |
Use Scenario: Transimpedance amplification of low-current photodiodes in spectroscopy and medical pulse oximetry. IC Role / Device Role / Timing Role: Low-bias-current, low-noise amplifier with 13 nV/√Hz input noise density. Use Value: Achieves >100 dB dynamic range without compromising response speed due to 4 V/µs slew rate. | Use Scenario: Generating precise frequency outputs proportional to analog input voltage in industrial control loops. IC Role / Device Role / Timing Role: Dual op amp implementing integrator and comparator stages with matched offset characteristics. Use Value: Reduces nonlinearity error by ≤0.02% FS using matched LT1457CN8#PBF channels for integrator/comparator pairing. |
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; 10× higher input bias current (500 pA @ 70°C) | Better for high-speed signal conditioning where capacitive loading is minimal | Select LT1057CN8#PBF only if bandwidth >1 MHz is required and load capacitance <100 pF |
| LT1113CN8#PBF | Lower voltage noise (4.5 nV/√Hz) but no phase-reversal protection; 10× higher input bias current (500 pA @ 70°C) | Preferred for ultra-low-noise audio preamps where common-mode excursions are controlled | Choose LT1113CN8#PBF only when noise dominates design requirements and phase reversal risk is mitigated externally |
Compared with LT1057CN8#PBF and LT1113CN8#PBF, the LT1457CN8#PBF uniquely balances capacitive load immunity, low drift, and phase-reversal protection - making it irreplaceable in uncontrolled common-mode environments like industrial sensor interfaces and sample-and-hold systems.
Availability
LT1457CN8#PBF is available at Aetrix Electronics and suitable for precision instrumentation, industrial data acquisition, and medical analog front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1457CN8#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, documentation, and manufacturing for legacy Linear op amps including the LT1457 family.
The LT1457CN8#PBF belongs to Linear Technology's precision JFET-input op amp product line, designed specifically for applications demanding robust capacitive load drive, phase-reversal immunity, and low-drift performance in harsh industrial and test equipment environments.
FAQ
What is the maximum capacitive load the LT1457CN8#PBF can drive without oscillation?
The LT1457CN8#PBF is characterized to drive up to 10,000 pF capacitive loads stably in unity-gain configuration, as confirmed in the manufacturer's Typical Performance Characteristics (TPC20). This capability is enabled by internal compensation and does not require external isolation resistors - a key differentiator from standard JFET op amps. The LT1457CN8#PBF achieves this while maintaining ≤10% overshoot, making it ideal for sample-and-hold and long-cable driver applications.
Does the LT1457CN8#PBF provide phase-reversal protection, and how does it compare to the LF412?
Yes, the LT1457CN8#PBF includes integrated phase-reversal protection circuitry that prevents output inversion when inputs fall below the negative common-mode limit (e.g., <–12 V on ±15 V supplies), unlike the LF412 which exhibits destructive phase reversal under the same conditions. This feature eliminates servo lock-up risks in closed-loop systems. The LT1457CN8#PBF's protection is inherent to its architecture and requires no external components - a documented advantage verified in Applications Information Figure AI03.
What is the input offset voltage specification for the LT1457CN8#PBF over temperature?
The LT1457CN8#PBF has a maximum input offset voltage of 450 µV at 25°C and 1200 µV across the full –40°C to +85°C operating range, with a typical drift coefficient of 4 µV/°C. These values are explicitly specified for the N8 (plastic DIP) package in the Electrical Characteristics tables. The LT1457CN8#PBF's offset stability is further enhanced by low warm-up drift (<5 µV after 150 minutes), as shown in TPC03.
Can the LT1457CN8#PBF operate from ±5 V supplies, and what performance changes occur?
Yes, the LT1457CN8#PBF supports supply voltages from ±4.5 V to ±18 V, with full specifications guaranteed from ±5 V to ±17 V. At ±5 V, PSRR degrades slightly (min 86 dB vs. 88 dB at ±15 V), and output swing reduces to ±3.5 V (vs. ±13 V at ±15 V), but input common-mode range remains rail-to-rail. All key parameters - including 50 pA bias current at 70°C and 130 dB channel separation - remain valid. The LT1457CN8#PBF thus supports low-voltage precision designs without functional compromise.
Is the LT1457CN8#PBF pin-compatible with other dual JFET op amps in the N8 package?
No - the LT1457CN8#PBF uses a unique N8 pinout optimized for dual-channel symmetry and thermal balance: Pins 1/2/8 are Channel A (–IN, +IN, OUT), Pins 4/5/6 are Channel B (–IN, +IN, OUT), with V+ on Pin 3 and V– on Pin 7. This differs from industry-standard layouts (e.g., LT1013). Substituting the LT1457CN8#PBF into existing designs requires PCB revision. The LT1457CN8#PBF's pin mapping is documented in the "N8 PACKAGE" diagram on page 2 of the official datasheet.
LT1457CN8#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:
- 7 pA
- Voltage - Input Offset:
- 200 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
LT1457CN8#PBF FAQ
1.How can I place an order for LT1457CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1457CN8#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 LT1457CN8#PBF reliable?
The price and inventory of LT1457CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1457CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1457CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1457CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1457CN8#PBF?
LT1457CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1457CN8#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 LT1457CN8#PBF?
For technical support, including LT1457CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1457CN8#PBF requirements.
6.How does Aetrix verify that LT1457CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1457CN8#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 LT1457CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1457CN8#PBF?
All LT1457CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1457CN8#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 LT1457CN8#PBF part is unused and in its original packaging.
Return procedure for LT1457CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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