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Analog Devices Inc. LT1789IS8-1#TRPBF
- Part No.:
- LT1789IS8-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1789IS8-1#TRPBF.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,518
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Product details
Overview
LT1789IS8-1#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, precision instrumentation amplifier optimized for single-supply operation from 2.2V to 36V. It delivers 95μA max supply current, 100μV max input offset voltage, and rail-to-rail output swing within 110mV of ground - enabling high-accuracy signal conditioning in battery-powered bridge sensor interfaces.
For engineers reviewing the LT1789IS8-1#TRPBF datasheet, LT1789IS8-1#TRPBF pinout, LT1789IS8-1#TRPBF application, or LT1789IS8-1#TRPBF equivalent, key selection criteria include its single-resistor programmable gain (G = 1 to 1000), ±40ppm max gain nonlinearity at G = 10, 96dB min CMRR, and guaranteed −40°C to +85°C industrial temperature operation in an 8-pin SO package.
Technical Context
The LT1789IS8-1#TRPBF implements a three-op-amp instrumentation architecture with laser-trimmed thin-film resistors, delivering precise gain accuracy and low drift. Its input stage operates down to the negative rail (V−), supporting true single-supply common-mode input range to ground.
Output stage design enables stable operation with capacitive loads up to 400pF across all gains, while ESD protection on inputs meets 10kV HBM. Gain is set externally via resistor RG between pins 1 and 8, with no internal gain-setting network - ensuring flexibility without calibration overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.2V to 36V total supply - supports direct connection to Li-ion, 5V, 12V, and 24V rails without regulation. |
| Quiescent Current | 95μA max - enables multi-year battery life in portable instrumentation and IoT sensor nodes. |
| Input Offset Voltage | 100μV max - ensures ≤0.1% error in 100mV full-scale bridge measurements at G = 100. |
| Gain Accuracy | 0.25% max gain error at G = 10 - eliminates need for system-level gain calibration in precision data acquisition. |
| CMRR | 96dB min at G = 10 - rejects >63,000:1 common-mode interference in noisy industrial environments. |
| Output Swing | Within 110mV of ground and to within 300mV of VS - maximizes dynamic range in low-voltage single-supply systems. |
| Bandwidth | 30kHz at G = 10 - sufficient for DC–10kHz sensor signals including strain gauges and thermocouples. |
| Input Noise | 48nV/√Hz at 1kHz - preserves SNR in microvolt-level transducer outputs. |
Pinout & Package
LT1789IS8-1#TRPBF is housed in an 8-lead plastic SO (Small Outline) package, footprint-compatible with industry-standard SOIC-8 layouts and reflow-solderable per JEDEC MS-012.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RG) | Gain Set Resistor Terminal | Connects to external resistor RG; sets gain G = 1 + (200kΩ/RG) - open-circuit yields G = 1. |
| 2 (–IN) | Inverting Input | Differential input node; accepts signals down to V− (ground in single-supply mode). |
| 3 (+IN) | Non-Inverting Input | Differential input node; common-mode range extends to V−, enabling ground-referenced sensors. |
| 4 (–VS) | Negative Supply Rail | Ground pin in single-supply configurations; must be tied to system ground. |
| 5 (REF) | Reference Input | Sets output common-mode level; typically tied to mid-supply or ADC reference for single-ended interfacing. |
| 6 (OUT) | Amplified Output | Single-ended output; swings rail-to-rail (within 110mV of ground and 300mV of VS). |
| 7 (+VS) | Positive Supply Rail | Accepts 2.2V to 36V; supplies both input and output stages. |
| 8 (RG) | Gain Set Resistor Terminal | Completes RG connection; identical function to Pin 1 - forms two-terminal gain programming interface. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed input offset & drift | 100μV max VOS, 0.5μV/°C max drift - maintains calibration stability over temperature without software compensation. |
| Single-supply rail-to-rail output | Swings to within 110mV of ground and VS − 300mV - captures full sensor range without level-shifting circuitry. |
| ESD-protected inputs | 10kV HBM rating - survives handling and board-level ESD events without external protection diodes. |
| Capacitive load drive capability | Stable with up to 400pF load - allows direct connection to ADC input capacitors or long PCB traces without isolation resistors. |
| Wide common-mode input range | 0V to VS − 1V - accommodates grounded Wheatstone bridges and other low-side referenced sensors. |
| Low-power precision | 95μA supply current with 96dB CMRR and 40ppm nonlinearity - achieves performance previously requiring >1mA quiescent current. |
Applications
| Bridge Amplifiers | Strain Gauge Amplifiers |
|---|---|
Use Scenario: Amplifying mV-level differential output from a 350Ω quarter-bridge pressure sensor powered from 3.3V. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing G = 100, rejecting common-mode noise from shared power rails and motors. Use Value: 100μV max offset contributes <0.1% error at full scale; 95μA current enables 10-year coin-cell operation in wireless condition monitoring. | Use Scenario: Signal conditioning for a 120Ω foil strain gauge bonded to structural steel in a load cell. IC Role / Device Role / Timing Role: High-CMRR front-end amplifier driving a 16-bit SAR ADC with 2.5V reference. Use Value: 96dB CMRR suppresses 60Hz pickup from nearby AC wiring; rail-to-rail output fully utilizes ADC's 0–2.5V input range. |
| Thermocouple Amplifiers | Portable Instrumentation |
Use Scenario: Cold-junction-compensated K-type thermocouple interface in a handheld multimeter. IC Role / Device Role / Timing Role: Low-drift, low-noise amplifier with programmable gain for µV/°C thermocouple output. Use Value: 0.5μV/°C max VOS drift minimizes temperature measurement error; 48nV/√Hz noise ensures <0.1°C resolution at 1Hz bandwidth. | Use Scenario: Battery-powered handheld gas detector using electrochemical sensors with nA-level output currents. IC Role / Device Role / Timing Role: Micropower transimpedance amplifier and signal conditioner in analog front-end. Use Value: 95μA supply current extends 2xAA battery life to >2 years; single-resistor gain simplifies field calibration for different sensor sensitivities. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8421ARMZ | Higher supply current (350μA), wider bandwidth (12MHz), but requires dual supply or level-shifting for true single-supply use. | Better for high-speed, high-precision lab equipment; less suitable for battery-powered designs. | Select when bandwidth >100kHz or CMRR >120dB is required; avoid if <100μA quiescent current is mandatory. |
| INA333AIDR | Lower quiescent current (50μA), same G = 1–1000 range, but only 85dB CMRR at G = 10 and 200μV max VOS. | Cost-optimized for consumer-grade portable devices where moderate accuracy suffices. | Select for cost-sensitive, ultra-low-power applications where 0.25% gain error and 96dB CMRR are not required. |
Compared with AD8421ARMZ and INA333AIDR, the LT1789IS8-1#TRPBF uniquely balances micropower operation (95μA), high CMRR (96dB), and single-supply rail-to-rail output - making it optimal for industrial-grade portable sensors where accuracy, power, and supply simplicity are simultaneously critical.
Availability
LT1789IS8-1#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, bridge amplifiers, strain gauge interfaces, and thermocouple signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for LT1789IS8-1#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LT1789 family was designed by Linear Technology (acquired by ADI in 2017) specifically for precision, low-power instrumentation in space-constrained, single-supply systems - targeting applications where traditional op-amp-based IA designs fail due to power, accuracy, or layout limitations.
FAQ
What is the maximum gain achievable with LT1789IS8-1#TRPBF?
The LT1789IS8-1#TRPBF supports a gain range of 1 to 1000, set by a single external resistor RG connected between pins 1 and 8. At G = 1000, the device maintains 40ppm max nonlinearity and 0.25% max gain error - verified across the −40°C to +85°C operating range. The LT1789IS8-1#TRPBF does not support gains below 1 or above 1000 per its specified architecture.
Does LT1789IS8-1#TRPBF require dual supplies?
No, the LT1789IS8-1#TRPBF is explicitly optimized for single-supply operation from 2.2V to 36V. Its inputs operate down to the negative rail (V−, typically ground), and its output swings within 110mV of ground and to within 300mV of VS. This eliminates the need for dual supplies or level-shifting circuitry in battery-powered or 3.3V/5V systems.
What is the guaranteed temperature range for LT1789IS8-1#TRPBF?
The LT1789IS8-1#TRPBF is rated for operation from −40°C to +85°C and is fully specified and tested across this industrial temperature range. Unlike the C-grade variant, the 'I' suffix confirms guaranteed performance at both extremes - critical for outdoor, automotive under-hood, or factory-floor deployments where ambient temperatures fluctuate widely.
Can LT1789IS8-1#TRPBF drive an ADC input directly?
Yes, the LT1789IS8-1#TRPBF can directly drive most SAR and delta-sigma ADC inputs. Its output is stable with capacitive loads up to 400pF, and its rail-to-rail swing (within 110mV of ground and VS − 300mV) aligns well with typical 0–VREF ADC input ranges. For best THD performance, keep trace lengths short and avoid excessive capacitance beyond 400pF without series resistance.
How is gain configured on LT1789IS8-1#TRPBF?
Gain on the LT1789IS8-1#TRPBF is configured using a single external resistor RG connected between pins 1 and 8. For this part (LT1789-1 variant), gain follows G = 1 + (200kΩ / RG). An open circuit yields G = 1; a 200kΩ resistor yields G = 2; and a 200Ω resistor yields G = 1001 (rounded to 1000 per spec limit). No internal trimming or digital interface is required.
LT1789IS8-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.026V/µs
- Gain Bandwidth Product:
- 60 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 17 nA
- Voltage - Input Offset:
- 30 µV
- Current - Supply:
- 85µA
- Current - Output / Channel:
- 8.5 mA
- 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
LT1789IS8-1#TRPBF FAQ
1.How can I place an order for LT1789IS8-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1789IS8-1#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 LT1789IS8-1#TRPBF reliable?
The price and inventory of LT1789IS8-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1789IS8-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1789IS8-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1789IS8-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1789IS8-1#TRPBF?
LT1789IS8-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1789IS8-1#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 LT1789IS8-1#TRPBF?
For technical support, including LT1789IS8-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1789IS8-1#TRPBF requirements.
6.How does Aetrix verify that LT1789IS8-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1789IS8-1#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 LT1789IS8-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1789IS8-1#TRPBF?
All LT1789IS8-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1789IS8-1#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 LT1789IS8-1#TRPBF part is unused and in its original packaging.
Return procedure for LT1789IS8-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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