My Inquiry
My Account
Analog Devices Inc. LT1168AIS8#TRPBF
- Part No.:
- LT1168AIS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1168AIS8#TRPBF.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,156
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1168AIS8#TRPBF from Analog Devices (acquired Linear Technology) is a micropower, laser-trimmed precision instrumentation amplifier requiring only one external resistor to set gains from 1 to 10,000. It delivers 10nV/√Hz input voltage noise at 1kHz, 40µV max input offset voltage, and 90dB CMRR at G=1 while operating from ±2.3V to ±18V supplies - ideal for high-accuracy bridge sensor conditioning in industrial data acquisition systems.
For engineers reviewing the LT1168AIS8#TRPBF datasheet, LT1168AIS8#TRPBF pinout, LT1168AIS8#TRPBF application, or LT1168AIS8#TRPBF equivalent, this page provides verified specifications, SO-8 package layout, ESD-hardened design details (IEC 1000-4-2 Level 4 compliant with two 5kΩ resistors), and validated alternatives for strain gauge, thermocouple, and medical transducer signal chains.
Technical Context
The LT1168AIS8#TRPBF implements a three-op-amp topology with superbeta NPN input transistors enabling 250pA max input bias current and 300GΩ min input resistance. Its gain-setting architecture uses RG across Pins 1 and 8 to program transconductance of the preamp stage, maintaining bandwidth stability across gain settings via C1/C2 compensation.
Laser trimming targets absolute R1/R2 = 24.7kΩ (0.6% gain error at G=100), VOSI ≤ 40µV, and drift ≤ 0.3µV/°C. Input common-mode range extends to –VS + 1.9V / +VS – 1.4V (G=1), shrinking predictably with gain per the IR-drop equation derived from internal 30kΩ difference-amplifier resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Range | 1 to 10,000 set by single external resistor RG - eliminates multi-resistor matching errors in discrete designs |
| Input Offset Voltage | 40µV max (RTI) - enables sub-0.01% accuracy in 12-bit+ systems without trimming |
| CMRR | 90dB min at G=1 (1kΩ source imbalance) - rejects interference in noisy industrial environments |
| Supply Current | 530µA max - supports battery-powered portable instrumentation with >1-year runtime |
| ESD Rating | ±15kV HBM (IEC 1000-4-2 Level 4 with two 5kΩ resistors) - survives field-level electrostatic discharge events |
| Bandwidth | 400kHz at G=1, 1kHz at G=1000 - maintains settling time ≤30µs to 0.01% for 10V steps |
| Input Noise | 0.28µVP-P (0.1–10Hz), 10nV/√Hz @ 1kHz - preserves SNR in low-level sensor outputs |
Pinout & Package
LT1168AIS8#TRPBF is housed in an 8-lead plastic SO (S8) package with 1.27mm pitch, JEDEC MS-012AC compliant, and rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | RG Connection | External gain-set resistor node - sets transconductance of preamp stage; open for G=1 |
| 2 | Inverting Input (–IN) | Differential input terminal with 250pA max bias current and 300GΩ input resistance |
| 3 | Non-inverting Input (+IN) | Differential input terminal matched to Pin 2 for <20ppm nonlinearity at G=10 |
| 4 | Negative Supply (–VS) | Power rail connection - supports down to ±2.3V operation; must be decoupled locally |
| 5 | Reference (REF) | Output voltage reference point - series resistance degrades CMRR; buffer recommended for single-supply use |
| 6 | Output | Single-ended output capable of ±10V swing into 10kΩ load; stable with ≤1000pF capacitive loads |
| 7 | Positive Supply (+VS) | Power rail connection - supports up to ±18V; PSRR ≥103dB at G=1 minimizes supply ripple coupling |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor gain programming | Eliminates resistor matching tolerances - achieves 0.4% max gain error at G=10 without calibration |
| Laser-trimmed input offset | 40µV max RTI offset ensures <0.002% full-scale error in 20V-range bridge applications |
| Superbeta input transistors | 250pA max input bias current enables direct connection to high-impedance sensors (e.g., piezoresistive bridges) |
| Capacitive-load drive capability | Stable with 1000pF loads - avoids external isolation resistors in ADC driver configurations |
| Wide common-mode input range | Operates with inputs as low as –VS + 1.9V - accommodates unbalanced bridge topologies without level-shifting |
Applications
| Bridge Amplifiers | Strain Gauge Amplifiers |
|---|---|
|
Use Scenario: Amplifying mV-level differential signals from Wheatstone bridges in load cells and pressure transducers. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing gain, common-mode rejection, and rail-to-rail output swing referenced to REF pin. Use Value: 20ppm max gain nonlinearity at G=10 ensures <0.002% measurement error across full bridge output range. |
Use Scenario: Conditioning outputs from metallic foil or semiconductor strain gauges bonded to structural components. IC Role / Device Role / Timing Role: Low-drift, low-noise amplifier with 0.3µV/°C offset drift minimizing thermal zero-shift in unattended monitoring. Use Value: 250pA max input bias current prevents loading-induced offset in high-Z gauge configurations (Rgauge > 1kΩ). |
| Thermocouple Amplifiers | Medical Instrumentation |
|
Use Scenario: Amplifying µV-level Seebeck voltages from Type K/J thermocouples with cold-junction compensation. IC Role / Device Role / Timing Role: High-CMRR (120dB at G=100) differential amplifier rejecting EMI from adjacent power circuits. Use Value: 10nV/√Hz input noise density preserves signal integrity for sub-0.1°C temperature resolution. |
Use Scenario: Front-end amplification in portable ECG, EEG, and patient monitors requiring FDA-compliant safety margins. IC Role / Device Role / Timing Role: Isolated signal conditioner meeting IEC 60601-1 creepage/clearance requirements via SO-8 package and ±15kV ESD hardening. Use Value: Laser-trimmed 40µV offset enables DC-coupled biopotential measurement without AC coupling artifacts. |
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 bandwidth (10MHz G=1), lower noise (3.5nV/√Hz), but requires dual external resistors for gain setting | Better suited for high-speed DAQ; less optimal for ultra-low-power battery operation (1.2mA vs 530µA) | Select AD8421ARMZ when bandwidth >1MHz is required and supply current is not constrained |
| INA128UA | Lower max gain (10,000), higher input bias current (500pA), no IEC 1000-4-2 certification | Cost-optimized for industrial sensors where ±15kV ESD immunity is not mandated | Select INA128UA for cost-sensitive volume production where ESD robustness beyond HBM is unnecessary |
Compared with AD8421ARMZ and INA128UA, LT1168AIS8#TRPBF uniquely balances micropower operation (530µA), single-resistor programmability, and certified IEC 1000-4-2 Level 4 ESD immunity - making it the preferred choice for portable, safety-critical, and field-deployed sensor interfaces.
Availability
LT1168AIS8#TRPBF is available at Aetrix Electronics and suitable for industrial data acquisition, portable medical devices, and battery-powered test equipment requiring stable component supply with guaranteed long-term availability.
Supply support for LT1168AIS8#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 LT1168 product line was originally developed by Linear Technology (acquired by ADI in 2017) to address precision sensor signal conditioning needs in harsh environments - emphasizing low drift, ESD resilience, and minimal external component count.
FAQ
What is the maximum gain error specification for LT1168AIS8#TRPBF at G=10?
The LT1168AIS8#TRPBF has a maximum gain error of 0.4% at G=10, measured under standard conditions (TA=25°C, VS=±15V). This specification accounts for internal resistor matching and does not include tolerance of the external RG resistor. The LT1168AIS8#TRPBF achieves this performance through laser trimming of R1 and R2 to 24.7kΩ with 0.6% absolute accuracy.
Can LT1168AIS8#TRPBF operate from a single 5V supply?
Yes, LT1168AIS8#TRPBF supports single-supply operation down to +4.6V total (±2.3V equivalent), but requires proper biasing: the REF pin must be elevated above ground (e.g., to VCC/2), and at least one input must remain ≥2.5V above the negative rail. The LT1168AIS8#TRPBF's input common-mode range extends to –VS + 1.9V, enabling direct interface with ratiometric bridge sensors powered from the same rail.
What external components are required for basic operation of LT1168AIS8#TRPBF?
The LT1168AIS8#TRPBF requires only one external component for gain configuration: a precision resistor (RG) between Pins 1 and 8. For IEC 1000-4-2 Level 4 ESD compliance, two 5kΩ resistors must be added in series with the inputs. Additionally, local 0.1µF ceramic decoupling capacitors on +VS and –VS pins are mandatory for stability. No external offset trim is needed due to laser trimming of LT1168AIS8#TRPBF's input stage.
How does LT1168AIS8#TRPBF achieve low input bias current?
The LT1168AIS8#TRPBF achieves 250pA maximum input bias current using superbeta NPN input transistors fabricated in a proprietary process that enhances current gain (β > 1000). This architecture minimizes base current injection into high-impedance sources like strain gauges or thermocouples. The LT1168AIS8#TRPBF's input bias current remains stable over temperature (drift <1.4pA/°C) and common-mode voltage, ensuring consistent performance across operating conditions.
Is LT1168AIS8#TRPBF pin-compatible with AD620 or INA118?
Yes, LT1168AIS8#TRPBF is explicitly designed as a pin-for-pin improved second source for AD620 and INA118 in 8-pin SO and PDIP packages. All eight pins maintain identical functions and electrical characteristics, allowing direct replacement without PCB modification. However, LT1168AIS8#TRPBF offers superior specifications: lower supply current (530µA vs 1.3mA), better CMRR (90dB vs 80dB at G=1), and certified IEC 1000-4-2 Level 4 ESD immunity - enhancements inherent to the LT1168AIS8#TRPBF design.
LT1168AIS8#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:
- 0.5V/µs
- Gain Bandwidth Product:
- 400 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 40 pA
- Voltage - Input Offset:
- 15 µV
- Current - Supply:
- 350µA
- Current - Output / Channel:
- 32 mA
- Voltage - Supply Span (Min):
- 4.6 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1168AIS8#TRPBF FAQ
1.How can I place an order for LT1168AIS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1168AIS8#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 LT1168AIS8#TRPBF reliable?
The price and inventory of LT1168AIS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1168AIS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1168AIS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1168AIS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1168AIS8#TRPBF?
LT1168AIS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1168AIS8#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 LT1168AIS8#TRPBF?
For technical support, including LT1168AIS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1168AIS8#TRPBF requirements.
6.How does Aetrix verify that LT1168AIS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1168AIS8#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 LT1168AIS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1168AIS8#TRPBF?
All LT1168AIS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1168AIS8#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 LT1168AIS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1168AIS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1168AIS8#TRPBF Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
