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Analog Devices Inc. LT2178IS8#TRPBF
- Part No.:
- LT2178IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT2178IS8#TRPBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,581
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Product details
Overview
LT2178IS8#TRPBF 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 rail-to-ground output swing and input voltage range extending below ground. It delivers 17μA max supply current per amplifier, 70μV max input offset voltage, 250pA max input offset current, 0.9μVP-P voltage noise (0.1Hz–10Hz), and 85kHz gain bandwidth product - enabling high-accuracy signal conditioning in battery-powered sensor interfaces.
For engineers reviewing the LT2178IS8#TRPBF datasheet, LT2178IS8#TRPBF pinout, LT2178IS8#TRPBF application, or LT2178IS8#TRPBF equivalent, key selection criteria include its guaranteed –40°C to +85°C industrial temperature range, true precision performance at ultra-low quiescent current, compatibility with single lithium-cell or dual NiCd supplies, and absence of pull-down resistors due to all-NPN output stage sinking capability.
Technical Context
The LT2178IS8#TRPBF employs an all-NPN output stage enabling output swing to within millivolts of ground while sinking current, eliminating need for external pull-down resistors. Its input stage uses matched NPN transistors to achieve low offset voltage (70μV max) and low drift (0.5μV/°C typ), with picoampere-level input bias and offset currents supporting megohm-source applications without significant error.
Designed for single-supply systems down to 2.2V, it maintains specified performance across ±15V and 5V/0V supplies. The device features 93dB min CMRR and 94dB min PSRR at 25°C, with 1.5pAP-P current noise (0.1Hz–10Hz) and 85kHz gain bandwidth - balancing precision, power efficiency, and stability in high-impedance, low-power signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current per Amp | 17μA max - enables multi-year battery life in portable instrumentation and remote sensors. |
| Input Offset Voltage | 70μV max - ensures ≤0.007% gain error in 1V full-scale thermocouple amplifiers. |
| Input Offset Current | 250pA max - permits use with ≥1MΩ source impedances without >0.25mV added offset. |
| Voltage Noise | 0.9μVP-P (0.1Hz–10Hz) - supports low-frequency precision measurement without excessive filtering. |
| Gain Bandwidth Product | 85kHz - sufficient for anti-aliasing filters and DC-coupled sensor signal conditioning up to ~10kHz. |
| Output Swing (Low) | ≤9mV above ground (no load) - eliminates need for level-shifting circuitry in single-supply data acquisition. |
| Common Mode Range | Extends 0.3V below V– - allows direct interfacing to grounded transducers and shunt-based current sensing. |
Pinout & Package
LT2178IS8#TRPBF is housed in an 8-lead plastic SOIC (S8) package, 3.9mm × 4.9mm body, 1.27mm pitch, with JEDEC-standard pinout and industrial-grade thermal resistance (θJA = 190°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V+) | Positive Supply Rail | Accepts 2.2V to ±22V; supports single 5V or dual ±15V operation. |
| 2 (OUT B) | Amplifier B Output | Drives loads up to 5mA; swings to within 9mV of ground when sinking. |
| 3 (–IN B) | Inverting Input B | High-impedance node (≥0.8GΩ differential); accepts signals down to V– – 0.3V. |
| 4 (+IN B) | Non-Inverting Input B | Matches –IN B in bias current and offset; used for unity-gain buffers or non-inverting stages. |
| 5 (OUT A) | Amplifier A Output | Independent output with same drive and swing specs as OUT B. |
| 6 (–IN A) | Inverting Input A | Electrically isolated from –IN B; enables dual-channel signal processing without crosstalk. |
| 7 (+IN A) | Non-Inverting Input A | Provides second high-impedance input path; matches +IN B in offset and drift characteristics. |
| 8 (V–) | Negative Supply Rail | Reference for both amplifiers; may be connected to ground in single-supply configurations. |
Key Features
| Feature | Design Value |
|---|---|
| All-NPN output stage | Enables true rail-to-ground output swing while sinking current - removes need for pull-down resistors and simplifies PCB layout. |
| Ultra-low supply current | 17μA per amplifier max - extends battery life in portable instrumentation and satellite telemetry systems. |
| Picoampere input offset current | 250pA max - preserves accuracy in high-impedance sensor front-ends (e.g., pH electrodes, photodiode TIA feedback networks). |
| Low 1/f voltage noise | 0.9μVP-P (0.1Hz–10Hz) - minimizes drift-induced errors in DC-coupled thermocouple and strain gauge amplifiers. |
| Guaranteed industrial temp range | –40°C to +85°C operation - qualified for automotive cabin modules, industrial process controllers, and outdoor environmental sensors. |
Applications
| Thermocouple Amplifier | Micropower Sample-and-Hold |
|---|---|
Use Scenario: Amplifying low-level µV/°C thermocouple outputs in handheld temperature calibrators with 10-year battery life. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with cold-junction compensation interface, operating from single 3.6V Li-ion cell. Use Value: 70μV max VOS and 0.5μV/°C drift limit total error to <±0.5°C over –20°C to +70°C ambient, while 17μA current enables >5 years runtime on 200mAh battery. | Use Scenario: Capturing slow-varying sensor outputs (e.g., gas concentration, soil moisture) in wireless IoT nodes. IC Role / Device Role / Timing Role: Low-leakage hold amplifier with buffered output, driven by ultra-low-duty-cycle sampling clock. Use Value: 250pA max IOS limits hold capacitor discharge to <1mV/s on 10nF cap, enabling 16-bit effective resolution over 100ms acquisition windows. |
| Remote Sensor Amplifier | Micropower Filters |
Use Scenario: Signal conditioning for 4–20mA loop-powered pressure transmitters located kilometers from control room. IC Role / Device Role / Timing Role: Low-power instrumentation amplifier front-end with programmable gain and ESD-hardened inputs. Use Value: 17μA supply current allows full analog signal chain (gain, filtering, output driver) to operate within 3.5mA loop budget; 93dB CMRR rejects common-mode noise on long cables. | Use Scenario: 2nd-order Butterworth low-pass filtering in battery-operated ECG monitors requiring <1μA standby current. IC Role / Device Role / Timing Role: Dual op-amp section implementing Sallen-Key topology with precision film resistors and NP0 capacitors. Use Value: 85kHz GBW supports 1kHz cutoff with <0.1dB passband ripple; 0.9μVP-P noise avoids degrading SNR of microvolt-level cardiac 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#TRPBF | Higher supply current (55μA vs 17μA), higher GBW (200kHz), lower VOS (70μV same), lower voltage noise (12nV/√Hz vs 50nV/√Hz @10Hz). | Better for higher-speed precision applications (e.g., 10ksps data loggers); less suitable for multi-year battery life requirements. | Select LT2078IS8#TRPBF when bandwidth >100kHz or slew rate >0.07V/μs is required; retain LT2178IS8#TRPBF for sub-100kHz, ultra-low-power designs. |
| LT1490AIS8#TRPBF | Rail-to-rail input/output, higher supply current (50μA), higher GBW (200kHz), higher VOS (150μV max), no guaranteed 0.1Hz–10Hz noise spec. | Required where input must swing beyond rails (e.g., monitoring battery voltage above V+); not recommended for low-noise DC amplification. | Choose LT1490AIS8#TRPBF only when rail-to-rail input range is mandatory; LT2178IS8#TRPBF remains superior for low-noise, low-drift, low-power DC signal chains. |
Compared with LT2078IS8#TRPBF and LT1490AIS8#TRPBF, the LT2178IS8#TRPBF uniquely balances sub-20μA quiescent current with 70μV VOS and 0.9μVP-P low-frequency noise - making it the optimal choice for long-life, high-accuracy, low-bandwidth sensor interfaces where power is constrained but precision is non-negotiable.
Availability
LT2178IS8#TRPBF is available at Aetrix Electronics and suitable for battery-powered systems, portable instrumentation, and remote sensor amplifiers requiring stable component supply across extended production lifecycles.
Supply support for LT2178IS8#TRPBF 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 micropower precision op amp product line, engineered specifically for single-supply, low-voltage, high-accuracy signal conditioning in energy-constrained environments.
FAQ
What is the maximum operating temperature range for LT2178IS8#TRPBF?
The LT2178IS8#TRPBF is rated for industrial temperature operation from –40°C to +85°C. This range is fully tested and guaranteed per datasheet specifications, including input offset voltage, supply current, and common-mode rejection ratio. The "I" grade designation in the part number explicitly confirms this extended temperature qualification, distinguishing it from commercial-grade variants like LT2178CS8#TRPBF (0°C to 70°C). All electrical characteristics in the I-grade column apply across this full range.
Does LT2178IS8#TRPBF support true single-supply operation with input below ground?
Yes, the LT2178IS8#TRPBF supports true single-supply operation with input voltage extending 0.3V below the negative rail (V–), which is typically ground in single-supply configurations. Its input stage operates correctly with common-mode voltages from V– – 0.3V to V+ – 1.5V at 5V supply. This enables direct connection to grounded transducers and shunt resistors without level-shifting circuitry - a key feature confirmed in the "Input Voltage Range" specification (3.5V to –0.3V at 5V/0V supply) and functional description.
What is the typical output swing capability of LT2178IS8#TRPBF near ground?
The LT2178IS8#TRPBF features an all-NPN output stage that sinks current to within 9mV of ground under no-load conditions and to 160mV with 100μA sink current (at –40°C to +85°C). This rail-to-ground capability eliminates the need for pull-down resistors in single-supply applications. The datasheet specifies "Output Low, No Load" as 9mV max for the I-grade, directly enabling direct interfacing with ADC reference inputs or logic-level thresholds without additional active circuitry.
Can LT2178IS8#TRPBF be used with supply voltages lower than 5V?
Yes, the LT2178IS8#TRPBF is specified to operate down to 2.2V total supply voltage (e.g., single 2.4V lithium cell or two NiCd cells), with guaranteed performance including input offset voltage and supply current. The datasheet notes functionality down to 1.7V, though offset voltage may shift by –300μV at that level. Minimum supply voltage is explicitly listed as 2.2V in the Electrical Characteristics table, and typical performance curves (e.g., supply current vs temperature) include data at VS = ±1.5V (3V total), confirming robust sub-5V operation.
How does the noise performance of LT2178IS8#TRPBF compare between voltage and current domains?
The LT2178IS8#TRPBF delivers 0.9μVP-P voltage noise (0.1Hz–10Hz) and 1.5pAP-P current noise (0.1Hz–10Hz), with voltage noise density of 50nV/√Hz at 10Hz and current noise density of 0.03pA/√Hz at 10Hz. This combination makes it optimal for medium-to-high source impedances: voltage noise dominates below ~10kΩ, while current noise becomes critical above ~100kΩ. The datasheet confirms these values in the "Electrical Characteristics" table and "Typical Performance Characteristics" plots G06–G08, validating its suitability for megohm-level sensor interfaces.
LT2178IS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT2178IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT2178IS8#TRPBF 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#TRPBF reliable?
The price and inventory of LT2178IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT2178IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT2178IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT2178IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT2178IS8#TRPBF?
LT2178IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT2178IS8#TRPBF 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#TRPBF?
For technical support, including LT2178IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT2178IS8#TRPBF requirements.
6.How does Aetrix verify that LT2178IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT2178IS8#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT2178IS8#TRPBF?
All LT2178IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT2178IS8#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT2178IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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