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Analog Devices Inc. LT2178ACS8#PBF
- Part No.:
- LT2178ACS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT2178ACS8#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LT2178ACS8#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. 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 LT2178ACS8#PBF datasheet, LT2178ACS8#PBF pinout, LT2178ACS8#PBF application, or LT2178ACS8#PBF equivalent, key selection criteria include guaranteed 0°C to 70°C operation, rail-to-rail input capability down to ground, true-ground-sinking output stage, and compatibility with megohm-level source impedances without significant error.
Technical Context
The LT2178ACS8#PBF employs an all-NPN output stage that enables output swing to within millivolts of ground while sinking current-eliminating need for pull-down resistors. Its input stage uses matched bipolar transistors to achieve low offset drift (0.5μV/°C typical) and picoampere-level input bias current (5nA max).
Designed for ultra-low-power precision, it maintains 85kHz gain-bandwidth product and 0.04V/μs slew rate at just 17μA supply current per amplifier, with CMRR ≥93dB and PSRR ≥94dB under 5V single-supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current per Amp | 17μA max - enables multi-year battery life in remote sensor nodes and portable medical devices. |
| Input Offset Voltage | 70μV max - ensures ≤0.007% gain error in 1V full-scale instrumentation amplifiers. |
| Voltage Noise (0.1–10Hz) | 0.9μVP-P - supports sub-microvolt signal resolution in thermocouple and strain gauge front-ends. |
| Input Bias Current | 5nA max - permits use with >1MΩ source impedances without significant DC error. |
| Gain Bandwidth Product | 85kHz - sufficient for anti-aliasing filters and low-frequency sensor signal conditioning up to ~10kHz. |
| Output Swing (Low) | ≤120mV above ground at 100μA sink - allows direct interfacing to 0V-referenced ADC inputs without level-shifting. |
| Common-Mode Range | Includes ground (0V) - supports single-supply operation with AC-coupled or bipolar input signals referenced to system ground. |
Pinout & Package
LT2178ACS8#PBF is housed in an 8-lead plastic SOIC (S8) package, 3.9mm × 4.9mm body, 1.27mm lead pitch, JEDEC MS-012 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - capable of sourcing/sinking ±5mA; swings to ground when sinking. |
| 2 | –IN A | Inverting input of Amplifier A - high-impedance node (≥0.8GΩ differential); sensitive to PCB leakage. |
| 3 | +IN A | Non-inverting input of Amplifier A - same impedance and noise characteristics as –IN A. |
| 4 | V– | Negative supply terminal - connects to ground in single-supply configurations; must be decoupled. |
| 5 | +IN B | Non-inverting input of Amplifier B - electrically isolated from Amplifier A; shares V– and V+ rails. |
| 6 | –IN B | Inverting input of Amplifier B - independent bias path; channel separation ≥110dB minimizes crosstalk. |
| 7 | OUT B | Amplifier B output - identical drive capability and swing behavior as OUT A. |
| 8 | V+ | Positive supply terminal - operates from 2.2V to ±22V; 5V nominal for optimized precision performance. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation from 2.2V | Enables direct use with lithium coin cells or two NiCd batteries; no charge pump or split-rail generation required. |
| Input voltage range includes ground | Accepts input signals down to 0V in 5V systems - eliminates need for level-shifting circuitry in sensor interfaces. |
| All-NPN output stage | Sinks current to within 120mV of ground at 100μA - removes requirement for external pull-down resistors and saves board space/power. |
| 0.1Hz–10Hz voltage noise = 0.9μVP-P | Supports stable DC-coupled amplification of microvolt-level thermocouple outputs without 1/f noise degradation. |
| Channel separation ≥110dB | Prevents signal coupling between amplifiers in dual-channel data acquisition - critical for simultaneous sampling applications. |
Applications
| Portable Instrumentation | Remote Sensor Amplifier |
|---|---|
Use Scenario: Handheld multimeter front-end amplifying mV-range DC signals from shunt resistors and thermocouples. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with ultra-low input bias current and offset drift. Use Value: Enables 16-bit resolution measurement accuracy over 0°C–50°C ambient without recalibration, using only passive compensation. | Use Scenario: Wireless temperature node with thermistor bridge feeding into ADC via long PCB traces. IC Role / Device Role / Timing Role: Low-noise, low-drift buffer isolating high-impedance sensor from trace capacitance and EMI. Use Value: Maintains <1μV offset shift over 10-year deployment due to 0.5μV/°C drift and 0.5μV/month long-term stability. |
| Micropower Sample-and-Hold | Thermocouple Amplifier |
Use Scenario: Ultra-low-power data logger capturing slow-varying environmental parameters every 10 seconds. IC Role / Device Role / Timing Role: Input buffer and hold amplifier in switched-capacitor architecture with minimal droop. Use Value: 17μA per amplifier reduces total analog section quiescent current to <50μA - extends CR2032 battery life beyond 5 years. | Use Scenario: Industrial K-type thermocouple interface with cold-junction compensation in 24V loop-powered transmitter. IC Role / Device Role / Timing Role: First-stage instrumentation-grade amplifier with matched input bias for differential sensing. Use Value: 5nA max input bias current prevents >100μV error across 20kΩ thermocouple leads, preserving ±0.5°C accuracy. |
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), higher GBW (200kHz vs 85kHz), lower VOS (70μV max same), rail-to-rail output. | Better dynamic performance but 3× higher power draw - suitable where speed matters more than battery life. | Select LT2078CS8#PBF if bandwidth >100kHz or rail-to-rail output swing is required; otherwise LT2178ACS8#PBF offers superior energy efficiency. |
| OPA2333AIDR | Zero-drift architecture (0.02μV/°C drift), 17μA supply current, 350kHz GBW, but higher voltage noise (0.65μVRMS @ 1kHz). | Superior DC stability for long-term monitoring, but less optimal for low-frequency (<10Hz) microvolt signal integrity. | Choose OPA2333AIDR for applications demanding near-zero drift over temperature; choose LT2178ACS8#PBF for lowest 0.1–10Hz noise in thermocouple or strain gauge use. |
Compared with LT2078CS8#PBF and OPA2333AIDR, the LT2178ACS8#PBF uniquely balances ultra-low 0.1–10Hz noise, true ground-sinking output, and micropower consumption - making it optimal for DC-precision, battery-constrained sensor front-ends where low-frequency noise dominates error budget.
Availability
LT2178ACS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, remote sensor amplifiers, and micropower sample-and-hold circuits requiring stable component supply across industrial and medical OEM programs.
Supply support for LT2178ACS8#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 technical and manufacturing continuity for legacy Linear op amp families.
The LT2178 series belongs to Linear Technology's micropower precision op amp product line, designed specifically for single-supply, low-noise, low-drift signal conditioning in energy-constrained environments such as portable test equipment and wireless sensor networks.
FAQ
What is the maximum operating temperature range for the LT2178ACS8#PBF?
The LT2178ACS8#PBF is specified for commercial temperature operation from 0°C to 70°C. This grade is validated per datasheet Section "ORDER INFORMATION" and confirmed by part marking "2178A" and package labeling "LT2178ACS8#PBF". The device is not rated for industrial (–40°C to 85°C) operation - for that range, select LT2178AIS8#PBF instead. Thermal derating is not supported beyond 70°C ambient.
Does the LT2178ACS8#PBF support true single-supply operation with input signals at ground potential?
Yes, the LT2178ACS8#PBF supports true single-supply operation with input common-mode voltage extending to ground (0V). As stated in the "FEATURES" section and verified in Electrical Characteristics tables, the input voltage range includes ground under 5V supply conditions. This allows direct connection of grounded-referenced sensors like thermocouples or bridge transducers without level-shifting circuitry - a key design advantage confirmed in Typical Application TA01 and TA04.
What is the output drive capability of the LT2178ACS8#PBF at 5V supply?
The LT2178ACS8#PBF can source and sink up to ±5mA load current at 5V supply, as specified in the "FEATURES" list. Under 100μA sink conditions, the output low voltage is guaranteed ≤120mV above ground (Table, "Maximum Output Voltage Swing"). At no load, output high reaches ≥4.2V and output low ≤6.5mV. These values are measured per Electrical Characteristics table for LT2178AC grade at TA = 25°C and VS = 5V, 0V.
Can the LT2178ACS8#PBF be used with high-impedance sources such as thermistors or photodiodes?
Yes, the LT2178ACS8#PBF is well-suited for high-impedance sources: its 5nA max input bias current and 0.05nA max input offset current minimize voltage errors across megaohm-level source impedances. The 1.5pAP-P current noise (0.1–10Hz) further ensures minimal added uncertainty. These specifications are explicitly validated in the "ELECTRICAL CHARACTERISTICS" table for LT2178AC grade and confirmed in application notes TA01 and TA04.
Is the LT2178ACS8#PBF pin-compatible with other dual op amps in SO-8 packages?
The LT2178ACS8#PBF uses standard SO-8 pinout per "PIN CONFIGURATION" diagram: Pin 1 = OUT A, Pin 2 = –IN A, Pin 3 = +IN A, Pin 4 = V–, Pin 5 = +IN B, Pin 6 = –IN B, Pin 7 = OUT B, Pin 8 = V+. This matches industry-standard dual op amp layout (e.g., LM358, TL072, OP27). However, electrical compatibility requires verification - for example, LT2078CS8#PBF shares this pinout but draws 3× more current and has different noise profile.
LT2178ACS8#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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT2178ACS8#PBF FAQ
1.How can I place an order for LT2178ACS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT2178ACS8#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 LT2178ACS8#PBF reliable?
The price and inventory of LT2178ACS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT2178ACS8#PBF is usually 5 days.
3.What payment methods are accepted for LT2178ACS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT2178ACS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT2178ACS8#PBF?
LT2178ACS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT2178ACS8#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 LT2178ACS8#PBF?
For technical support, including LT2178ACS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT2178ACS8#PBF requirements.
6.How does Aetrix verify that LT2178ACS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT2178ACS8#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 LT2178ACS8#PBF meets industry standards.
7.What is the process for return or replacement of LT2178ACS8#PBF?
All LT2178ACS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT2178ACS8#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 LT2178ACS8#PBF part is unused and in its original packaging.
Return procedure for LT2178ACS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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