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Analog Devices Inc. LT1077CN8#PBF
- Part No.:
- LT1077CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1077CN8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,658
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Product details
Overview
LT1077CN8#PBF from Analog Devices (formerly Linear Technology) is a micropower precision operational amplifier optimized for single-supply 5V operation, featuring 40µV max input offset voltage, 60µA max supply current, 0.5µVP-P (0.1Hz–10Hz) voltage noise, 250kHz gain-bandwidth product, and rail-to-ground output swing while sinking current. It serves as a low-power replacement for OP-07/AD707 in battery-powered sensor front-ends and 4–20mA current loops.
For engineers reviewing the LT1077CN8#PBF datasheet, LT1077CN8#PBF pinout, LT1077CN8#PBF application, or LT1077CN8#PBF equivalent, key selection criteria include verified micropower precision performance at 5V/0V supply, guaranteed ground-sinking output without pull-down resistors, confirmed pin compatibility with industry-standard nulling circuits, and documented replacement capability for OP-07/OP-77/AD707 with >30× supply current reduction.
Technical Context
The LT1077CN8#PBF employs an all-NPN output stage enabling true ground-swing capability (≤7mV output low, ISINK = 100µA) without external pull-downs, unlike competing micropower op amps requiring ≥600mV headroom or discrete resistors. Its input stage includes series protection resistors allowing safe operation with inputs down to –5V relative to V–, preventing phase reversal even at –1.0V input under single-supply conditions.
It achieves precision via internal laser-trimmed offset (40µV max, 0.4µV/°C drift) while maintaining 94dB min CMRR and 100dB min PSRR over 0°C to 70°C - specifications fully validated at both 5V/0V and ±15V supplies, with noise performance (0.7Hz 1/f corner) optimized for low-frequency instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 60µA max at 5V/0V - enables multi-year operation on coin-cell batteries in portable instrumentation. |
| Input Offset Voltage | 40µV max - lowest among micropower op amps, eliminating need for external nulling in most precision DC applications. |
| 0.1Hz–10Hz Voltage Noise | 0.5µVP-P - supports high-resolution DC-coupled measurements in strain gauge and thermopile interfaces. |
| Gain-Bandwidth Product | 250kHz - sufficient for 20kHz bandwidth difference amplifiers with 1MΩ source impedances. |
| Output Swing (Low) | ≤7mV above ground at 100µA sink - enables direct interfacing with ADC reference inputs and logic-level comparators. |
| Common Mode Range | Extends 0.3V below V– - allows input signals to go slightly negative in single-supply systems without damage or phase reversal. |
| Offset Voltage Drift | 0.4µV/°C max - ensures <1µV total drift over 0°C–70°C, critical for unattended environmental monitoring. |
Pinout & Package
N8 package: 8-lead PDIP (narrow, 0.300-inch width), JEDEC MS-012, RoHS-compliant, operating temperature range 0°C to 70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | VOS TRIM | Nulling terminals for external 10k potentiometer - maintains full plug-in compatibility with OP-07/AD707 trimming circuits. |
| 2 | –IN | Inverting input - high-impedance (≥6GΩ common-mode) node for precision difference amplifier configurations. |
| 3 | +IN | Non-inverting input - protected against –5V overvoltage, enabling robust interface with transducer outputs. |
| 4 | V– | Negative supply - accepts 0V (ground) in single-supply mode; input common-mode extends 0.3V below this rail. |
| 5 | NC | No connect - unused internal node; must remain unconnected per datasheet. |
| 6 | OUT | Amplifier output - all-NPN stage sinks current to within 7mV of V– without pull-down resistors. |
| 7 | V+ | Positive supply - operates from 2.2V to 18V; minimum 2.2V enables use with depleted alkaline cells. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply ground-sinking output | Eliminates 10k–30k pull-down resistors required by OP-90/LM4250, saving >80µA in 4–20mA loop transmitters. |
| Phase reversal protection | Prevents output lock-up when input dips to –1.0V, enabling reliable operation with transient-prone industrial sensors. |
| Megohm-source difference amplifier | Supports 1MΩ source resistors with <80µVP-P noise (0.1Hz–10Hz), enabling high-impedance thermocouple conditioning. |
| Plug-in replacement for OP-07/AD707 | Same pinout, same nulling circuit, same PCB footprint - reduces redesign time while cutting supply current by 30–60×. |
| Ultra-low 1/f noise corner | 0.7Hz corner frequency delivers 0.5µVP-P low-frequency noise - matches performance of op amps drawing 10× more current. |
Applications
| Battery-Powered Sensor Front-End | 4–20mA Current Loop Transmitter |
|---|---|
Use Scenario: Amplifying mV-level outputs from load cells or RTDs in portable field instruments powered by two AA batteries. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with ultra-low input offset and drift, referenced to single 3V supply. Use Value: Enables 16-bit resolution over 0°C–70°C without calibration, extending battery life beyond 5 years due to 60µA quiescent current. | Use Scenario: Driving 4–20mA loop with HART modulation in smart pressure transmitters using 3.3V microcontroller I/O. IC Role / Device Role / Timing Role: Voltage-to-current converter output stage with rail-to-ground swing and high PSRR. Use Value: Eliminates external pull-down resistor (saving 100µA), maintains loop accuracy to ±0.05% FSR over temperature with 0.4µV/°C offset drift. |
| Megaohm-Source Difference Amplifier | Self-Buffered Micropower Reference |
Use Scenario: Measuring differential voltage across high-resistance pH electrodes or ion-selective membranes. IC Role / Device Role / Timing Role: High-input-impedance difference amplifier with picoampere input bias current (350pA max). Use Value: Supports 1MΩ source resistors without signal degradation, achieving <0.1% gain error and 80µVP-P noise in 0.1Hz–10Hz band. | Use Scenario: Providing stable 1.23V reference for ADCs in energy-harvesting wireless sensors. IC Role / Device Role / Timing Role: Precision buffer for LT1034 shunt reference, delivering 10mA output with 30µV/mA load regulation. Use Value: Maintains ±1.2% reference accuracy over temperature while consuming only 60µA total system current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OP-07CP | Higher 1.2mA supply current, 60µV offset, no ground-sinking output - requires pull-down resistor for 0V swing. | Not suitable for battery-powered designs; used where absolute lowest offset dominates power concerns. | Select OP-07CP only if sub-10µV offset is mandatory and power budget exceeds 1mA. |
| AD707JN | 800µA supply current, 25µV offset, ±13V output swing - lacks single-supply ground-sinking capability. | Requires dual supply; preferred in legacy ±15V test equipment where noise floor is secondary to offset. | Choose AD707JN when replacing aging ±15V systems and PCB layout cannot accommodate new footprints. |
Compared with OP-07CP and AD707JN, the LT1077CN8#PBF delivers equivalent precision (40µV vs 25–60µV offset) at <1/30th the supply current, with unique ground-sinking output enabling true single-supply operation - making it the sole option for long-life, low-voltage, high-impedance sensor interfaces.
Availability
LT1077CN8#PBF is available at Aetrix Electronics and suitable for battery-powered sensor front-ends, 4–20mA current loop transmitters, and megaohm-source difference amplifiers requiring stable component supply across extended production lifecycles.
Supply support for LT1077CN8#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, inheriting its legacy of high-performance analog ICs including precision op amps, references, and power management solutions.
The LT1077CN8#PBF belongs to Linear's micropower precision op amp family, designed specifically for single-supply, low-noise, low-drift instrumentation in space-constrained, energy-limited applications such as portable medical devices and remote environmental sensors.
FAQ
What is the maximum supply voltage rating for LT1077CN8#PBF?
The LT1077CN8#PBF has an absolute maximum supply voltage rating of ±22V, with recommended operating range from 2.2V to 18V for single-supply use (V+ to V–). At 5V/0V operation, it delivers specified performance including 40µV max offset and 60µA max supply current - making LT1077CN8#PBF ideal for coin-cell and two-AA battery systems.
Does LT1077CN8#PBF require external nulling components in typical applications?
No - the LT1077CN8#PBF features factory-laser-trimmed input offset voltage (40µV max), eliminating the need for external nulling in most precision DC applications. External nulling via pins 1 and 8 remains supported for ultra-high-accuracy requirements (<10µV), preserving full compatibility with OP-07/AD707 PCB layouts. This design choice makes LT1077CN8#PBF suitable for space-constrained layouts where trim-pot real estate is unavailable.
Can LT1077CN8#PBF drive capacitive loads without instability?
Yes - the LT1077CN8#PBF is internally compensated and stable with capacitive loads up to 1000pF, as verified in datasheet Figure TPC12. For loads >100pF, phase margin remains >54° at 5V/0V supply, ensuring monotonic step response in sensor buffering and filter applications. This stability eliminates the need for isolation resistors in ADC driver configurations, simplifying design and preserving signal integrity in LT1077CN8#PBF-based data acquisition systems.
What is the guaranteed output voltage swing for LT1077CN8#PBF at 100µA sink current?
At 100µA sink current and 5V/0V supply, the LT1077CN8#PBF guarantees an output low voltage of ≤150mV (typical 90–130mV), with worst-case 150mV specified across 0°C to 70°C. This rail-to-ground capability enables direct interfacing with low-threshold comparators and ADC reference inputs without level-shifting circuitry - a key differentiator from competing micropower op amps that require pull-down resistors to achieve similar swing.
How does LT1077CN8#PBF handle input voltages below ground in single-supply operation?
The LT1077CN8#PBF incorporates series input protection resistors allowing safe operation with inputs down to –5V relative to V– (0V), preventing latch-up or destruction. Crucially, its phase reversal protection circuitry ensures the output remains stable and non-inverting even when the input reaches –1.0V - unlike OP-90 or LM124 which exhibit catastrophic output inversion. This makes LT1077CN8#PBF robust for industrial sensor interfaces subject to ESD transients or wiring faults.
LT1077CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.12V/µs
- Gain Bandwidth Product:
- 230 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 7 nA
- Voltage - Input Offset:
- 25 µV
- Current - Supply:
- 56µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.2 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1077CN8#PBF FAQ
1.How can I place an order for LT1077CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1077CN8#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 LT1077CN8#PBF reliable?
The price and inventory of LT1077CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1077CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1077CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1077CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1077CN8#PBF?
LT1077CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1077CN8#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 LT1077CN8#PBF?
For technical support, including LT1077CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1077CN8#PBF requirements.
6.How does Aetrix verify that LT1077CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1077CN8#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 LT1077CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1077CN8#PBF?
All LT1077CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1077CN8#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 LT1077CN8#PBF part is unused and in its original packaging.
Return procedure for LT1077CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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