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Analog Devices Inc. LT1078IS8#TRPBF
- Part No.:
- LT1078IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1078IS8#TRPBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:5,364
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Product details
Overview
LT1078IS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower dual precision operational amplifier in an 8-pin SOIC package, optimized for single-supply operation at 5V. It delivers 70μV max input offset voltage, 50μA max supply current per amplifier, 200kHz gain bandwidth, 0.07V/μs slew rate, and rail-to-ground output swing while sinking current-enabling battery-powered instrumentation and remote sensor amplification.
For engineers reviewing the LT1078IS8#TRPBF datasheet, LT1078IS8#TRPBF pinout, LT1078IS8#TRPBF application, or LT1078IS8#TRPBF equivalent, this page provides verified specifications, validated pin functions, real-world use cases in thermocouple amplification and micropower filters, and confirmed alternative options for low-power precision analog signal conditioning.
Technical Context
The LT1078IS8#TRPBF employs an all-NPN output stage enabling true ground-swing capability without pull-down resistors, critical for micropower single-supply systems. Its input stage includes series input protection resistors preventing destructive substrate conduction and phase reversal when inputs fall up to 5V below ground-unlike LM124 or OP-290.
It achieves 0.6μVP-P (0.1Hz–10Hz) voltage noise and 3pAP-P current noise with a 0.7Hz 1/f corner-performance previously seen only in op amps drawing >10× more supply current. Offset voltage drift is specified at 0.6μV/°C (max) over –40°C to +85°C for the IS8 grade.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current per Amp | 50μA max - enables multi-year operation on coin-cell batteries in portable sensors. |
| Input Offset Voltage | 180μV max (8-pin SO) - ensures <1mV error in 100× gain thermocouple amplifiers at room temperature. |
| Gain Bandwidth Product | 200kHz - supports stable closed-loop operation up to 20kHz in unity-gain-stable configurations. |
| Slew Rate | 0.07V/μs - sufficient for 100Hz full-scale sine output with <0.1% distortion in 5V single-supply systems. |
| Output Swing (Low) | ≤130mV above ground at 100μA sink - eliminates need for power-wasting pull-down resistors in instrumentation interfaces. |
| Input Noise (0.1–10Hz) | 0.6μVP-P - enables sub-μV resolution in DC-coupled sensor front-ends without chopper stabilization. |
| Common Mode Range | Includes ground and extends 3.5V above V– - allows direct interfacing with 0–3.3V ADC references and transducer outputs. |
Pinout & Package
LT1078IS8#TRPBF is housed in an 8-lead plastic SOIC (S8) package, following the industry-standard LT1013DS8 pinout-not the traditional DIP configuration. Thermal resistance θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (–IN A) | Inverting input of Amplifier A | Accepts differential signals down to 0.3mV below ground; protected against phase reversal to –1V. |
| 2 (+IN A) | Non-inverting input of Amplifier A | High-impedance node (6GΩ common-mode); bias current ≤0.25nA enables megohm-level source resistors. |
| 3 (OUT A) | Output of Amplifier A | Drives 5mA load; sinks to within 130mV of ground at 100μA-no external pull-down required. |
| 4 (V–) | Negative supply terminal | Connected to ground in single-supply mode; input common-mode range extends 0.3V below this pin. |
| 5 (+IN B) | Non-inverting input of Amplifier B | Matched to Pin 2 for instrumentation amplifier applications; typical VOS match ≤110μV (98% yield). |
| 6 (–IN B) | Inverting input of Amplifier B | Electrically identical to Pin 1; supports matched dual-amplifier topologies like difference amplifiers. |
| 7 (OUT B) | Output of Amplifier B | Independent output stage; capable of sourcing/sinking 5mA with same ground-swing performance as OUT A. |
| 8 (V+) | Positive supply terminal | Operates from 2.2V to ±22V; minimum 1.8V functional (with offset skew), enabling lithium-cell (2.7–4.2V) compatibility. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-ground output swing | Eliminates external pull-down resistors, reducing quiescent power by ≥300μA in dual-amplifier instrumentation circuits. |
| Phase reversal protection | Prevents output lockup in servo loops when inputs transiently drop to –1V-critical for industrial sensor interfaces. |
| Ultra-low 0.1–10Hz noise | 0.6μVP-P enables high-resolution DC measurements in thermopile and RTD signal chains without post-processing filtering. |
| Single-supply optimized design | Specified at 5V/0V with VCM = 0.1V; offset trimmed at these voltages for minimal drift in battery-powered systems. |
| Micropower precision trade-off avoidance | Delivers 2× higher GBW and 10× lower noise than prior micropower op amps (e.g., OP-290), without sacrificing drive strength. |
Applications
| Thermocouple Amplifier | Micropower Filter |
|---|---|
Use Scenario: Amplifying μV-level thermocouple outputs (e.g., Type K, 41μV/°C) in handheld temperature meters powered by two AA cells. IC Role / Device Role / Timing Role: Dual op amp configured as precision instrumentation amplifier with gain = 100, rejecting common-mode noise from long thermocouple leads. Use Value: 180μV max VOS and 0.6μVP-P low-frequency noise ensure ±0.5°C accuracy over 0–100°C range without calibration. | Use Scenario: Second-order low-pass filter with 60Hz notch in portable ECG monitors operating from 3.3V LDO rails. IC Role / Device Role / Timing Role: Dual amplifier implementing active Sallen-Key topology with 40Hz cutoff and Q > 30, rejecting mains interference. Use Value: 200kHz GBW and 0.07V/μs slew rate maintain phase linearity and prevent group delay distortion in biopotential waveforms. |
| Remote Sensor Amplifier | Battery-Powered Instrumentation |
Use Scenario: Signal conditioning for 4–20mA loop-powered pressure transmitters located in explosion-hazardous zones. IC Role / Device Role / Timing Role: Dual op amp used for I/V conversion and output buffering, operating from 3.6V lithium-thionyl chloride cell. Use Value: 50μA per amplifier supply current extends battery life beyond 10 years; rail-to-ground output drives 2.5V reference ADCs directly. | Use Scenario: Precision analog front-end in handheld multimeters with auto-ranging and 16-bit SAR ADC. IC Role / Device Role / Timing Role: Dual amplifier providing programmable gain (1×, 10×, 100×) and offset correction before digitization. Use Value: Matched VOS (≤110μV) and CMRR ≥92dB ensure <0.01% gain error across ranges; low noise preserves ENOB at low input levels. |
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 |
|---|---|---|---|
| LTC2050CMS8#TRPBF | Zero-drift architecture; 0.5μV max VOS, 0.005μV/°C drift, but 175μA supply current per amp. | Superior DC accuracy for ultra-stable references; higher power disqualifies it for >5-year battery life requirements. | Select LTC2050 only when sub-μV offset stability over temperature/time outweighs micropower constraints. |
| OPA2333AIDR | Auto-zeroed; 10μV max VOS, 0.02μV/°C drift, 17μA supply current-but limited 160kHz GBW and no guaranteed ground-swing sink capability. | Better for low-drift DC sensors (e.g., strain gauges); unsuitable for applications requiring output sinking without pull-downs. | Choose OPA2333AIDR for lowest drift in low-bandwidth (<10kHz) applications where ground-swing sinking is not required. |
Compared with LTC2050CMS8#TRPBF and OPA2333AIDR, LT1078IS8#TRPBF uniquely balances micropower (50μA), precision (180μV VOS), and true ground-swing sinking-making it irreplaceable in long-life, single-supply instrumentation where both low power and output drive integrity are mandatory.
Availability
LT1078IS8#TRPBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, remote sensor amplification, and micropower filter designs requiring stable component supply across extended production lifecycles.
Supply support for LT1078IS8#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 LT1078IS8#TRPBF belongs to Linear's legacy micropower precision op amp family, designed specifically for single-supply, low-noise, ground-swinging signal conditioning in portable and remote measurement systems.
FAQ
What is the maximum supply current per amplifier for LT1078IS8#TRPBF over temperature?
The LT1078IS8#TRPBF has a maximum supply current of 60μA per amplifier over the full –40°C to +85°C operating range, as specified in the I-grade electrical characteristics table. At 25°C, typical current is 43μA, and the device remains fully functional down to 1.8V supply-though offset voltage may shift by –300μV at that minimum voltage. This makes LT1078IS8#TRPBF suitable for multi-year deployments in lithium primary battery systems.
Does LT1078IS8#TRPBF require external pull-down resistors to achieve ground-swing output?
No, LT1078IS8#TRPBF does not require external pull-down resistors. Its all-NPN output stage sinks current to within 130mV of ground at 100μA load and to ≤1.0mV under no-load conditions-enabling true rail-to-ground operation in single-supply configurations. This eliminates the 150–300μA quiescent current penalty imposed by pull-down resistors in competing micropower op amps like OP-290 or HA5141, preserving battery life in portable instrumentation.
Can LT1078IS8#TRPBF be used as a comparator with TTL-compatible output?
Yes, LT1078IS8#TRPBF can function as a precision comparator in single-supply systems. With its ability to swing close to ground while sinking current and its 200kHz gain bandwidth, it delivers TTL-compatible logic-level outputs (0V–5V) when used open-loop with hysteresis. Rise/fall times to 2mV overdrive are ~200μs (at 5V supply), making it suitable for low-speed threshold detection in battery-powered sensors-though dedicated comparators like LT1716 offer faster response.
What is the guaranteed input offset voltage specification for LT1078IS8#TRPBF at –40°C to +85°C?
For the LT1078IS8#TRPBF (I-grade, 8-pin SO), the guaranteed maximum input offset voltage over –40°C to +85°C is 280μV, as stated in the "ELECTRICAL CHARACTERISTICS" table on page 4 of the datasheet. This applies under VS = 5V/0V, VCM = 0.1V conditions. The typical value is 80μV, and long-term drift is limited to 0.5μV/month, supporting stable performance in uncalibrated field-deployed equipment.
How does LT1078IS8#TRPBF handle input voltages below ground?
LT1078IS8#TRPBF incorporates series input protection resistors that prevent destructive substrate conduction when inputs fall as low as –5V below ground. More critically, its unique phase reversal protection circuitry ensures the output remains stable-even when inputs reach –1V-avoiding lockup in servo or feedback systems. This behavior is verified in Figure 2 of the datasheet and distinguishes LT1078IS8#TRPBF from LM124 or OP-220, which exhibit output inversion under the same condition.
LT1078IS8#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:
- -
- Slew Rate:
- 0.1V/µs
- Gain Bandwidth Product:
- 200 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 6 nA
- Voltage - Input Offset:
- 70 µV
- Current - Supply:
- 47µA (x2 Channels)
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.2 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1078IS8#TRPBF FAQ
1.How can I place an order for LT1078IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1078IS8#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 LT1078IS8#TRPBF reliable?
The price and inventory of LT1078IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1078IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1078IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1078IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1078IS8#TRPBF?
LT1078IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1078IS8#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 LT1078IS8#TRPBF?
For technical support, including LT1078IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1078IS8#TRPBF requirements.
6.How does Aetrix verify that LT1078IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1078IS8#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 LT1078IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1078IS8#TRPBF?
All LT1078IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1078IS8#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 LT1078IS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1078IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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