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Analog Devices Inc. LT1178S8#PBF
- Part No.:
- LT1178S8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1178S8#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,392
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Product details
Overview
LT1178S8#PBF from Analog Devices (formerly Linear Technology) is a micropower dual precision operational amplifier in an 8-lead SOIC package, optimized for single-supply operation at 5V with 14–21 µA per amplifier supply current, 60–180 µV input offset voltage, and 0.9 µVp-p (0.1–10 Hz) voltage noise. It serves as a low-power, rail-to-ground output amplifier in battery-powered sensor front-ends and portable instrumentation.
For engineers reviewing the LT1178S8#PBF datasheet, LT1178S8#PBF pinout, LT1178S8#PBF application, or LT1178S8#PBF equivalent, key selection criteria include its sub-20 µA quiescent current per channel, true ground-sinking output stage, picoampere-level input bias/offset currents, and guaranteed performance over 0°C to 70°C - critical for ultra-low-power analog signal conditioning where supply headroom and DC accuracy are constrained.
Technical Context
The LT1178S8#PBF employs an all-NPN output stage enabling 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 30 µV typical offset voltage and 50 pA typical offset current, with low drift (0.5–2.2 µV/°C) across temperature.
It operates from single supplies as low as 2.0 V (e.g., one Li-cell or two NiCd cells) or dual ±15 V, with input common-mode range extending 0.3 V below negative rail and full rail-to-rail output capability on the low side. Gain-bandwidth product is 60–85 kHz depending on supply configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current per Amp | 14–21 µA at 5V/0V - enables multi-year battery life in always-on sensor nodes. |
| Input Offset Voltage | 60–180 µV max (0°C to 70°C) - supports high-accuracy DC-coupled amplification without trimming. |
| Input Bias Current | 3–6 nA max - permits use with >1 MΩ source impedances without significant error. |
| Voltage Noise (0.1–10 Hz) | 0.9 µVp-p - ensures minimal low-frequency noise in thermocouple or strain gauge interfaces. |
| Output Swing Low | ≤8 mV above ground (no load), ≤140 mV at 100 µA sink - delivers true ground-referenced output for ADC driver stages. |
| Gain-Bandwidth Product | 60–85 kHz - sufficient for anti-aliasing filters, slow-settling sensor conditioning, and micropower active filters. |
| Common-Mode Rejection | 90–101 dB - maintains accuracy in noisy industrial or automotive environments with varying ground potentials. |
Pinout & Package
LT1178S8#PBF is housed in an 8-lead plastic small-outline (SOIC-N) package, 0.150-inch body width, with standard SOIC pinout compatible with industry layout practices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives loads up to 5 mA; swings to ground when sinking current. |
| 2 | –IN A | Inverting input of Amp A - high-impedance node (≥0.6 GΩ differential); sensitive to PCB leakage. |
| 3 | +IN A | Non-inverting input of Amp A - matched to –IN A for low offset; requires symmetrical layout. |
| 4 | V– | Negative supply rail - referenced to ground in single-supply mode; accepts 0 V. |
| 5 | V+ | Positive supply rail - supports 2.0–22 V single or ±1.5–±15 V dual supply. |
| 6 | –IN B | Inverting input of Amp B - electrically isolated from Amp A; shares same noise and drift specs. |
| 7 | +IN B | Non-inverting input of Amp B - independent bias network; no crosstalk with Amp A inputs. |
| 8 | OUT B | Amplifier B output - identical drive capability and rail-swing behavior as OUT A. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 14–21 µA per amplifier enables multi-year operation from coin cells or energy-harvesting sources. |
| True ground-sinking output | All-NPN output stage eliminates pull-down resistors, reducing board space and power loss in low-voltage systems. |
| Picoampere input offset current | ≤0.35 nA max allows direct interfacing with high-impedance sensors (e.g., pH electrodes, photodiodes). |
| Single-supply optimized architecture | Input range includes ground and output swings to ground - simplifies design in 3.3 V or 5 V microcontroller-based systems. |
| Low 1/f noise corner | 0.5 Hz corner frequency minimizes drift and low-frequency errors in DC-coupled precision applications. |
Applications
| Battery-Powered Sensor Amplifier | Thermocouple Signal Conditioning |
|---|---|
Use Scenario: Amplifying µV-level outputs from remote RTD or thermistor bridges in wireless IoT nodes powered by CR2032 batteries. IC Role / Device Role / Timing Role: Dual-channel precision amplifier providing gain, filtering, and level-shifting before 12-bit SAR ADC sampling. Use Value: 14 µA per amp extends battery life beyond 5 years; ground-sinking output ensures full dynamic range utilization of unipolar ADC reference. | Use Scenario: Cold-junction compensation and linearization of K-type thermocouples in portable handheld test equipment. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier with low thermal EMF inputs and matched input bias for offset stability. Use Value: 60 µV max offset and 0.5 µV/°C drift minimize temperature measurement error; picoampere bias avoids self-heating in high-Z thermocouple leads. |
| Micropower Active Filter | Portable Instrumentation Front-End |
Use Scenario: 2nd-order low-pass filter (10 Hz cutoff) in wearable ECG preamplifiers powered by rechargeable LiPo cells. IC Role / Device Role / Timing Role: Dual op-amp implementing Sallen-Key topology with unity-gain stable response and low noise. Use Value: 0.9 µVp-p noise preserves signal integrity; 60 kHz GBW supports accurate filter roll-off without phase distortion. | Use Scenario: Signal conditioning for handheld multimeters or portable oscilloscope probes requiring high input impedance and low power. IC Role / Device Role / Timing Role: Dual amplifier handling AC coupling, gain setting, and DC restoration in analog front-end path. Use Value: Independent channel separation >130 dB prevents crosstalk between voltage/current measurement paths; SOIC-8 footprint eases layout in space-constrained enclosures. |
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 |
|---|---|---|---|
| LTC2050HS8#PBF | Zero-drift architecture; 0.5 µV max offset, 0.005 µV/°C drift, but 170 µA supply current. | Higher DC accuracy required; battery life less critical than offset stability. | Select LTC2050HS8#PBF only when sub-µV offset drift is mandatory and 12× higher supply current is acceptable. |
| OPA2333AIDR | Auto-zero design; 10 µV max offset, 0.02 µV/°C drift, 17 µA supply current, rail-to-rail I/O. | Requires rail-to-rail input for signals near supply rails; needs tighter offset spec than LT1178S8#PBF provides. | Choose OPA2333AIDR when input common-mode range must extend to V+ and offset drift must be <0.05 µV/°C. |
Compared with LTC2050HS8#PBF and OPA2333AIDR, the LT1178S8#PBF offers the lowest quiescent current among precision dual op amps with verified ground-sinking output - making it uniquely suitable for long-life, ground-referenced, low-voltage sensor amplifiers where zero-drift isn't required.
Availability
LT1178S8#PBF is available at Aetrix Electronics and suitable for battery-powered sensor amplifiers, portable instrumentation, remote data loggers, and satellite telemetry circuits requiring stable component supply with guaranteed long-term availability.
Supply support for LT1178S8#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 support, manufacturing, and documentation for legacy Linear parts including the LT1178 series.
The LT1178S8#PBF belongs to Linear's micropower precision op amp family, designed specifically for ultra-low-power, high-accuracy analog signal conditioning in energy-constrained environments - emphasizing DC precision, ground-referenced operation, and robustness across wide supply ranges.
FAQ
What is the maximum supply voltage rating for the LT1178S8#PBF?
The LT1178S8#PBF has an absolute maximum supply voltage rating of ±22 V across V+ and V– pins. When operated from a single supply, the maximum positive supply is +22 V with V– tied to ground. Exceeding this rating risks permanent damage. For reliable operation, Linear specifies recommended operating conditions up to ±15 V or 5 V/0 V, where full electrical characteristics are guaranteed.
Does the LT1178S8#PBF support true single-supply operation with input signals at ground potential?
Yes, the LT1178S8#PBF supports true single-supply operation with input common-mode voltage ranging down to 0.3 V below the negative rail - meaning it accepts inputs at ground (0 V) when V– = 0 V. This is enabled by its PNP-input stage and is explicitly validated in the datasheet under "Input Voltage Range" specifications for 5 V/0 V supply conditions.
Can the LT1178S8#PBF drive a 2 kΩ load to ground without performance degradation?
Yes, the LT1178S8#PBF can sink 100 µA into a 2 kΩ load tied to ground while maintaining output saturation voltage ≤140 mV (max) at 0°C to 70°C. At lighter loads (e.g., 50 kΩ), output low voltage drops to ≤8 mV. This ground-sinking capability is intrinsic to its all-NPN output stage and does not require external pull-down resistors.
What is the typical 0.1 Hz to 10 Hz current noise of the LT1178S8#PBF?
The LT1178S8#PBF exhibits 1.5 pAp-p typical current noise over the 0.1 Hz to 10 Hz band, as specified in the "Electrical Characteristics" table for LT1178I/C/S grades. This ultra-low current noise enables accurate amplification of signals from high-impedance sources such as photodiodes, piezoelectric sensors, and electrochemical cells without introducing significant noise-induced error.
Is the LT1178S8#PBF pin-compatible with other LT1178 package variants like LT1178CN8?
No, the LT1178S8#PBF is not pin-compatible with the PDIP (N8) or CERDIP (J8) versions of the LT1178. The SOIC-8 (S8) package uses standard industry pinout: Pin 1 = OUT A, Pin 2 = –IN A, Pin 3 = +IN A, Pin 4 = V–, Pin 5 = V+, Pin 6 = –IN B, Pin 7 = +IN B, Pin 8 = OUT B. In contrast, the N8 and J8 packages follow dual-in-line numbering with different pin assignments - confirmed in the "PACKAGE/ORDER INFORMATION" section of the datasheet.
LT1178S8#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:
- -
- Slew Rate:
- 0.04V/µs
- Gain Bandwidth Product:
- 85 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 3 nA
- Voltage - Input Offset:
- 120 µV
- Current - Supply:
- 17µA (x2 Channels)
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1178S8#PBF FAQ
1.How can I place an order for LT1178S8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1178S8#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 LT1178S8#PBF reliable?
The price and inventory of LT1178S8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1178S8#PBF is usually 5 days.
3.What payment methods are accepted for LT1178S8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1178S8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1178S8#PBF?
LT1178S8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1178S8#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 LT1178S8#PBF?
For technical support, including LT1178S8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1178S8#PBF requirements.
6.How does Aetrix verify that LT1178S8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1178S8#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 LT1178S8#PBF meets industry standards.
7.What is the process for return or replacement of LT1178S8#PBF?
All LT1178S8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1178S8#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 LT1178S8#PBF part is unused and in its original packaging.
Return procedure for LT1178S8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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