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Analog Devices Inc. LT2178IS8#PBF
- Part No.:
- LT2178IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT2178IS8#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,068
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Product details
Overview
LT2178IS8#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 voltage noise (0.1Hz–10Hz), enabling high-accuracy signal conditioning in battery-powered sensor interfaces and portable instrumentation.
For engineers reviewing the LT2178IS8#PBF datasheet, LT2178IS8#PBF pinout, LT2178IS8#PBF application, or LT2178IS8#PBF equivalent, key selection criteria include guaranteed industrial-temperature performance, rail-to-ground output swing while sinking current, picoampere-level input bias current (5nA max), and compatibility with megohm-level source impedances without significant error.
Technical Context
The LT2178IS8#PBF employs an all-NPN output stage that enables true ground-swing capability-output sinks to within 9mV of ground under 100μA load-eliminating need for pull-down resistors. Its input stage features low input bias current (5nA max) and low offset current (250pA max), supporting high-impedance transducer interfacing.
Designed for ultra-low-power precision, it achieves 85kHz gain-bandwidth product and 0.04V/μs slew rate at just 17μA supply current per amplifier, with offset voltage drift limited to 0.5μV/°C over the full industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current per Amp | 17μA max - enables multi-year battery life in always-on remote sensors. |
| Input Offset Voltage | 70μV max - ensures ≤0.4% output error in 1V-range thermocouple amplifiers. |
| Input Bias Current | 5nA max - permits use with >1MΩ source resistors without significant DC error. |
| Voltage Noise | 0.9μVP-P (0.1Hz–10Hz) - supports low-frequency precision measurement below 10Hz. |
| Output Swing Low | 9mV above ground (no load), 160mV (100μA sink) - eliminates external pull-downs in single-supply systems. |
| Gain Bandwidth Product | 85kHz - sufficient for anti-aliasing filters and DC-coupled sensor signal chains. |
| Common-Mode Range | Includes ground (VCM = –0.3V min at 5V supply) - accepts inputs below reference in single-supply designs. |
Pinout & Package
LT2178IS8#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 | Inverting amplifier output A - drives loads up to 5mA sourcing/sinking. |
| 2 | –IN A | Inverting input A - high-impedance node (5nA max bias) for feedback or signal routing. |
| 3 | +IN A | Non-inverting input A - accepts signals down to –0.3V with 5V supply. |
| 4 | V– | Negative supply terminal - tied to ground in single-supply operation. |
| 5 | +IN B | Non-inverting input B - independent channel with identical DC specs as Channel A. |
| 6 | –IN B | Inverting input B - electrically isolated from Channel A; channel separation >110dB. |
| 7 | OUT B | Inverting amplifier output B - fully independent, rail-to-ground capable output. |
| 8 | V+ | Positive supply terminal - operates from 2.2V to ±22V; minimum functional supply is 1.7V. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply ground-swing output | Outputs sink to within 9mV of ground without pull-down resistors - reduces BOM count and PCB area. |
| Micropower precision architecture | 17μA/amplifier supply current with 70μV VOS max and 0.5μV/°C drift - balances ultra-low power with DC accuracy. |
| Picoampere input offset current | 250pA max - preserves signal integrity when amplifying high-Z sources like piezoelectric or pH sensors. |
| Low 0.1Hz–10Hz noise | 0.9μVP-P voltage noise + 1.5pAP-P current noise - critical for DC-stable thermocouple and strain gauge front-ends. |
| Industrial temperature guarantee | Full electrical specs validated from –40°C to +85°C - suitable for automotive cabin, industrial IoT, and outdoor sensor nodes. |
Applications
| Remote Sensor Amplifier | Thermocouple Amplifier |
|---|---|
|
Use Scenario: Amplifying microvolt-level outputs from RTDs or thermistors 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 ADC reference or buffer. Use Value: 17μA supply current extends battery life beyond 5 years; 70μV VOS limits temperature measurement error to <±0.2°C at 25°C. |
Use Scenario: Cold-junction compensation and linearization of Type-K thermocouples in portable test equipment. IC Role / Device Role / Timing Role: Low-drift, low-noise instrumentation amplifier front-end with matched input bias for differential sensing. Use Value: 0.5μV/°C offset drift minimizes thermal EMF-induced drift; 5nA input bias avoids self-heating errors in high-resistance thermocouple leads. |
| Micropower Sample-and-Hold | Micropower Filters |
|
Use Scenario: Holding analog sensor readings during MCU sleep cycles in energy-harvesting IoT nodes. IC Role / Device Role / Timing Role: Unity-gain buffer isolating hold capacitor from leakage paths and ADC input impedance. Use Value: 5nA input bias current limits hold capacitor discharge to <1μV/ms on 10nF - enables >1-second hold time with <1mV droop. |
Use Scenario: 2nd-order active low-pass filtering in wearable health monitors sampling ECG or PPG signals. IC Role / Device Role / Timing Role: Dual-amplifier implementation of Sallen-Key topology with matched DC specs across channels. Use Value: 85kHz GBW supports 1kHz cutoff with <0.1dB passband ripple; 0.9μVP-P noise avoids degrading SNR in sub-10μV biomedical signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT2078IS8#PBF | Higher supply current (55μA), higher GBW (200kHz), lower VOS (70μV same), but no guaranteed ground-swing output. | Better for bandwidth-critical applications (e.g., fast-settling data acquisition); less suitable for ultra-low-power ground-referenced outputs. | Choose LT2078IS8#PBF when >100kHz GBW is required and system can tolerate higher quiescent current. |
| LT1490IS8#PBF | Rail-to-rail input/output, 50μA supply current, higher VOS (150μV), no guaranteed industrial-temp VOS spec. | Preferred for wide-input-voltage-range applications (–0.4V to 44V), but lacks LT2178IS8#PBF's low-noise and low-drift stability. | Choose LT1490IS8#PBF when input must swing beyond rails or RRO output swing is mandatory, accepting higher noise and drift. |
Compared with LT2078IS8#PBF and LT1490IS8#PBF, the LT2178IS8#PBF uniquely combines guaranteed industrial-temperature micropower operation (17μA), ground-swing output, and sub-1μVP-P low-frequency noise - making it optimal for long-life, low-drift, single-supply sensor signal chains where bandwidth demand is ≤100kHz.
Availability
LT2178IS8#PBF is available at Aetrix Electronics and suitable for battery-powered systems, portable instrumentation, and remote sensor amplifiers requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LT2178IS8#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.
The LT2178 series belongs to Linear Technology's precision micropower op amp family, designed specifically for ultra-low-power, high-accuracy signal conditioning in energy-constrained environments such as satellite telemetry, remote monitoring, and portable medical devices.
FAQ
What is the guaranteed operating temperature range for LT2178IS8#PBF?
The LT2178IS8#PBF is specified and tested over the full industrial temperature range of –40°C to +85°C. All key DC parameters-including input offset voltage (70μV max), offset drift (0.5μV/°C), and supply current (17μA max)-are guaranteed across this range, unlike C-grade variants which are only characterized at 25°C.
Does LT2178IS8#PBF support true single-supply operation with input and output referenced to ground?
Yes. The LT2178IS8#PBF accepts input common-mode voltages down to –0.3V (with 5V supply) and its all-NPN output stage sinks to within 9mV of ground under no load-enabling true ground-referenced operation without pull-down resistors. This is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables for the I-grade part.
What is the maximum capacitive load the LT2178IS8#PBF can drive stably?
The LT2178IS8#PBF remains stable driving up to 12pF capacitive load in unity-gain configuration, as verified in Typical Performance Characteristic G12. For loads exceeding 12pF, external isolation resistance (e.g., 100Ω in series with output) is recommended to maintain phase margin and prevent peaking or oscillation.
Can LT2178IS8#PBF operate from a single lithium cell (2.8V–3.6V)?
Yes. The LT2178IS8#PBF has a minimum functional supply voltage of 1.7V (per Note 5), and is fully specified down to 2.2V. At 3V supply, it maintains 70μV max VOS, 17μA max IS, and ground-swing output-making it ideal for direct integration with single-cell Li-ion or Li-polymer battery systems.
How does the noise performance of LT2178IS8#PBF compare to LT2078IS8#PBF in low-frequency applications?
The LT2178IS8#PBF offers significantly lower 0.1Hz–10Hz voltage noise (0.9μVP-P) than the LT2078IS8#PBF (1.5μVP-P), despite both having similar input bias current. This 40% reduction directly improves resolution in DC-coupled applications like thermocouple amplification or precision weigh scales where 1/f noise dominates error budgets.
LT2178IS8#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:
- 90 µV
- Current - Supply:
- 17µA (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
LT2178IS8#PBF FAQ
1.How can I place an order for LT2178IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT2178IS8#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 LT2178IS8#PBF reliable?
The price and inventory of LT2178IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT2178IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT2178IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT2178IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT2178IS8#PBF?
LT2178IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT2178IS8#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 LT2178IS8#PBF?
For technical support, including LT2178IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT2178IS8#PBF requirements.
6.How does Aetrix verify that LT2178IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT2178IS8#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 LT2178IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT2178IS8#PBF?
All LT2178IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT2178IS8#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 LT2178IS8#PBF part is unused and in its original packaging.
Return procedure for LT2178IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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