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Analog Devices Inc. LT2178AIS8#PBF
- Part No.:
- LT2178AIS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT2178AIS8#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,283
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Product details
Overview
LT2178AIS8#PBF from Analog Devices (formerly Linear Technology) is a dual, micropower, precision operational amplifier in an 8-lead SOIC package, optimized for single-supply operation at 5V with industrial temperature range (–40°C to +85°C). It delivers 17μA max supply current per amplifier, 70μV max input offset voltage, and 0.9μVP-P (0.1Hz–10Hz) voltage noise - enabling high-accuracy amplification of low-level signals in battery-constrained systems such as remote sensor front-ends and portable instrumentation.
For engineers reviewing the LT2178AIS8#PBF datasheet, LT2178AIS8#PBF pinout, LT2178AIS8#PBF application, or LT2178AIS8#PBF equivalent, key selection considerations include its rail-to-ground output swing while sinking current, picoampere-level input bias current (5nA max), ultra-low 1.5pAP-P current noise, and guaranteed performance across –40°C to +85°C without pull-down resistors.
Technical Context
The LT2178AIS8#PBF employs an all-NPN output stage enabling true ground-swing capability when sinking current - critical for single-supply systems where output must reach 0V without external circuitry. Its input stage uses matched bipolar transistors to achieve 70μV max VOS and 0.5μV/°C max drift, with CMRR ≥86dB and PSRR ≥88dB over full temperature range.
Designed for micropower precision, it features 85kHz gain-bandwidth product and 0.04V/μs slew rate at 5V supply, supporting stable DC-coupled signal conditioning and low-frequency filtering (e.g., thermocouple amps, micropower sample-and-hold) without compromising offset or noise integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current per Amp | 17μA max - enables multi-year battery life in always-on sensor nodes. |
| Input Offset Voltage | 70μV max - ensures ≤0.007% error in 1V full-scale measurements. |
| Voltage Noise (0.1–10Hz) | 0.9μVP-P - preserves SNR when amplifying sub-mV signals from high-Z sources. |
| Current Noise (0.1–10Hz) | 1.5pAP-P - minimizes Johnson noise contribution with ≥1MΩ source impedances. |
| Output Swing Low (ISINK=100μA) | 160mV above ground - allows direct interface to 0V-referenced ADCs without level-shifting. |
| Gain Bandwidth Product | 85kHz - supports stable 2nd-order active filters up to ~1kHz with <0.1dB passband ripple. |
| Input Bias Current | 5nA max - enables use with >100MΩ feedback networks in electrometer-grade circuits. |
Pinout & Package
LT2178AIS8#PBF is housed in an 8-lead plastic SOIC (S8) package, 3.9mm × 4.9mm, with standard dual op amp pinout and JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives loads up to 5mA; swings to within 160mV of ground when sinking 100μA. |
| 2 | –IN A | Inverting input of Amp A - high-impedance node (≥0.8GΩ differential); accepts inputs down to –0.3V with 5V supply. |
| 3 | +IN A | Non-inverting input of Amp A - same impedance and voltage range as –IN A; enables precision differential or single-ended sensing. |
| 4 | V– | Negative supply terminal - connects to ground in single-supply mode; supports rail-to-rail input common-mode range. |
| 5 | +IN B | Non-inverting input of Amp B - electrically isolated from Amp A; shares same input specs and bias current limits. |
| 6 | –IN B | Inverting input of Amp B - independent channel with identical noise, offset, and CMRR performance as Amp A. |
| 7 | OUT B | Amplifier B output - fully independent; capable of sourcing/sinking 5mA with matching low-voltage swing behavior. |
| 8 | V+ | Positive supply terminal - operates from 2.2V to ±22V; minimum functional supply is 1.7V (with offset skew). |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply ground-swing output | Outputs sink current to within 160mV of V– (ground) - eliminates need for pull-down resistors in 0V-referenced systems. |
| Ultra-low input bias current | 5nA max - enables stable DC coupling with megohm-level source impedances (e.g., pH electrodes, piezoresistive sensors). |
| Micropower precision architecture | 17μA/amplifier at 5V with 70μV VOS and 0.5μV/°C drift - balances power, accuracy, and thermal stability for industrial edge nodes. |
| Low 1/f noise floor | 0.9μVP-P (0.1–10Hz) and 1.5pAP-P - reduces drift-induced errors in slow-sampling applications like thermocouple amplifiers. |
| Guaranteed industrial temp operation | Specified and tested from –40°C to +85°C - ensures reliability in uncontrolled environments without derating. |
Applications
| Remote Sensor Amplifier | Thermocouple Amplifier |
|---|---|
|
Use Scenario: Amplifying microvolt-level outputs from RTDs or thermopiles in wireless environmental monitors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with rail-to-ground output driving SAR ADC reference buffers. Use Value: 17μA supply current extends 10-year battery life; 70μV VOS and 0.5μV/°C drift ensure <±0.5°C measurement accuracy over temperature. |
Use Scenario: Cold-junction compensation and linearization of Type-K thermocouples in industrial process controllers. IC Role / Device Role / Timing Role: Low-drift instrumentation amplifier front-end with matched input bias for differential thermocouple inputs. Use Value: 5nA max input bias prevents thermocouple self-heating errors; 0.9μVP-P noise maintains resolution below 10μV. |
| Micropower Sample-and-Hold | Portable Instrumentation Front-End |
|
Use Scenario: Holding analog sensor outputs during low-power MCU sleep cycles in handheld multimeters or gas detectors. IC Role / Device Role / Timing Role: Unity-gain buffer isolating high-impedance hold capacitor from leakage-sensitive sampling node. Use Value: 5nA input bias limits hold capacitor discharge to <1μV/s - enabling >1-second hold time with 1nF capacitor. |
Use Scenario: Signal conditioning for ECG/EEG electrodes in wearable medical devices operating from Li-ion or solar harvesters. IC Role / Device Role / Timing Role: Dual-channel programmable-gain amplifier with independent offset trimming paths. Use Value: Dual topology allows simultaneous high-gain biopotential amplification and low-gain reference monitoring - all within 34μA total quiescent current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual micropower precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT2078CS8#PBF | Higher supply current (55μA vs 17μA), 200kHz GBW, 0.07V/μs slew rate, 70μV VOS max - trades power for bandwidth and drive strength. | Better suited for higher-speed filtering or driving capacitive loads >100pF; less optimal for multi-year battery life. | Select LT2078CS8#PBF when >100kHz closed-loop bandwidth or >10mA output drive is required; retain LT2178AIS8#PBF for ultra-low-power DC precision. |
| OPA2333AIDR | Rail-to-rail input/output, 17μA supply current, 2μV/°C drift, 6μV VOS max - lower offset but higher drift and CMOS input (0.2pA bias). | Superior for rail-to-rail signal chain interfacing; unsuitable for high-Z bipolar sensor interfaces due to CMOS gate leakage sensitivity. | Choose OPA2333AIDR for rail-to-rail I/O compatibility and lower initial offset; prefer LT2178AIS8#PBF for bipolar sensor front-ends requiring picoampere bias stability over temperature. |
Compared with LT2078CS8#PBF and OPA2333AIDR, the LT2178AIS8#PBF uniquely combines guaranteed industrial-temperature micropower operation, bipolar-input picoampere bias stability, and true ground-sink output - making it irreplaceable in long-life, high-impedance, single-supply measurement systems where offset drift and supply current are co-critical.
Availability
LT2178AIS8#PBF is available at Aetrix Electronics and suitable for remote sensor amplifiers, portable instrumentation, and thermocouple signal conditioning requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LT2178AIS8#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision measurement, industrial automation, and aerospace applications.
The LT2178AIS8#PBF belongs to Linear's legacy micropower precision op amp family, engineered specifically for single-supply, low-drift, low-noise signal conditioning in energy-constrained industrial and instrumentation systems.
FAQ
What is the maximum operating supply voltage for LT2178AIS8#PBF?
The LT2178AIS8#PBF has an absolute maximum supply voltage rating of ±22V. It is fully specified for operation from 2.2V to ±15V, with functional operation confirmed down to 1.7V (though offset voltage may shift by –300μV at that level). For robust long-term reliability in industrial designs, operation between 2.5V and 12V is recommended.
Does LT2178AIS8#PBF support true rail-to-rail input and output?
The LT2178AIS8#PBF supports rail-to-rail input common-mode range (down to 0.3V below V– and up to 3.5V above V– at 5V supply) and rail-to-ground output swing when sinking current (to within 160mV of V– at 100μA load). However, its output does not swing to V+ - maximum high output is 4.2V at 5V supply. It is not a full rail-to-rail output device.
Can LT2178AIS8#PBF be used with lithium coin-cell batteries?
Yes - the LT2178AIS8#PBF operates from a single 2.2V supply and draws only 17μA per amplifier, making it ideal for CR2032-powered sensor nodes. Its input voltage range includes ground, and its output sinks to near-ground without pull-down resistors - eliminating wasted current and simplifying low-voltage analog front-ends.
What is the guaranteed input offset voltage drift over temperature for LT2178AIS8#PBF?
The LT2178AIS8#PBF is guaranteed to exhibit ≤0.5μV/°C input offset voltage drift over its full industrial temperature range (–40°C to +85°C), as verified by production testing. This specification applies to the "AI" grade (LT2178AIS8#PBF) and ensures predictable calibration stability in unheated field deployments.
How does LT2178AIS8#PBF handle capacitive loads?
The LT2178AIS8#PBF remains stable with capacitive loads up to 12pF in unity-gain configuration. For larger loads (e.g., ADC input capacitance), a series isolation resistor (≥100Ω) is recommended. Its 85kHz GBW and 0.04V/μs slew rate limit large-signal settling time, but enable robust phase margin in low-frequency sensor interfaces.
LT2178AIS8#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:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.04V/µs
- Gain Bandwidth Product:
- 85 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 3 nA
- Voltage - Input Offset:
- 70 µV
- Current - Supply:
- 16µA (x2 Channels)
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.2 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT2178AIS8#PBF FAQ
1.How can I place an order for LT2178AIS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT2178AIS8#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 LT2178AIS8#PBF reliable?
The price and inventory of LT2178AIS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT2178AIS8#PBF is usually 5 days.
3.What payment methods are accepted for LT2178AIS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT2178AIS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT2178AIS8#PBF?
LT2178AIS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT2178AIS8#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 LT2178AIS8#PBF?
For technical support, including LT2178AIS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT2178AIS8#PBF requirements.
6.How does Aetrix verify that LT2178AIS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT2178AIS8#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 LT2178AIS8#PBF meets industry standards.
7.What is the process for return or replacement of LT2178AIS8#PBF?
All LT2178AIS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT2178AIS8#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 LT2178AIS8#PBF part is unused and in its original packaging.
Return procedure for LT2178AIS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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