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Analog Devices Inc. LT1167AIS8
- Part No.:
- LT1167AIS8
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1167AIS8.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,914
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Product details
Overview
LT1167AIS8 from Analog Devices (formerly Linear Technology) is a precision instrumentation amplifier requiring only one external resistor to set gains from 1 to 10,000. It delivers 7.5 nV/√Hz input voltage noise at 1 kHz, 0.3 μV/°C max input offset drift, and 90 dB CMRR at G = 1 - enabling high-accuracy bridge sensor signal conditioning in industrial pressure transducers and medical instrumentation.
For engineers reviewing the LT1167AIS8 datasheet, LT1167AIS8 pinout, LT1167AIS8 application, or LT1167AIS8 equivalent, this page provides verified package mapping (8-lead SO), confirmed thermal performance (–40°C to +85°C), validated gain error (0.13% max at G = 10), ESD robustness (13 kV HBM), and real-world settling behavior (130 μs to 0.01% at G = 1000).
Technical Context
The LT1167AIS8 implements a three-op-amp topology with laser-trimmed 24.7 kΩ internal resistors and superbeta NPN input transistors, enabling picoampere input bias current (≤600 pA over temperature) and stable gain accuracy across supply voltages from ±2.3 V to ±18 V. Its transconductance-based gain-setting architecture ensures bandwidth remains usable even at G = 1000 (12 kHz).
Input stage common-mode rejection is maintained via matched Q1/Q2 collector currents and feedback loops that force differential voltage across RG; output stage uses a unity-gain difference amplifier referenced to the REF pin, supporting single-supply operation when REF is tied to V– and inputs remain ≥2.1 V above negative rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Range | 1 to 10,000 set by single external resistor RG; enables flexible sensor scaling without multi-resistor networks. |
| Input Offset Drift | 0.3 μV/°C max (–40°C to +85°C); ensures <1.5 μV total drift over full industrial temperature range. |
| CMRR | 86 dB min at G = 1 (–40°C to +85°C); rejects interference from noisy industrial power rails. |
| Supply Current | 1.6 mA max (–40°C to +85°C); supports low-power battery-operated data acquisition systems. |
| ESD Rating | 13 kV HBM; passes IEC 1000-4-2 Level 4 when used with two 5 kΩ external resistors. |
| Bandwidth | 12 kHz at G = 1000; sufficient for DC–10 kHz sensor signals including strain gauge and thermocouple outputs. |
| Input Resistance | 200 GΩ min; preserves signal integrity from high-impedance sources like piezoresistive bridges. |
Pinout & Package
LT1167AIS8 is housed in an 8-lead plastic SO (S8) package, 3.9 mm × 4.9 mm, with standard SOIC footprint and gull-wing leads. RoHS-compliant, lead-free finish; JEDEC MS-012AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | RG (Gain Set) | Connects external resistor to set gain per G = 1 + 49.4 kΩ/RG; high-impedance node requiring low-noise layout. |
| 2 | –IN | Inverting input; accepts differential signal with common-mode range up to ±VS – 1.3 V. |
| 3 | +IN | Non-inverting input; matched to –IN for optimal CMRR; requires bias current return path. |
| 4 | –VS | Negative supply rail; must be decoupled locally; supports operation down to –2.3 V. |
| 5 | REF | Output reference terminal; output voltage is VOUT = VREF + G·(V+IN – V–IN); series resistance degrades CMRR. |
| 6 | OUTPUT | Single-ended amplified output; drives loads ≥2 kΩ; stable with ≤1000 pF capacitive load. |
| 7 | +VS | Positive supply rail; supports operation up to +18 V; decoupling critical for PSRR performance. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed gain resistors | 24.7 kΩ absolute value (0.05% tolerance at G = 100) enables accurate single-resistor gain programming. |
| Superbeta NPN input stage | ≤600 pA max input bias current (–40°C to +85°C) minimizes voltage error across high-Z sensor bridges. |
| Thermal drift compensation | Matched Q1/Q2 collector currents and trimmed R1/R2 reduce input offset drift to 0.3 μV/°C. |
| Reference-referred output | REF pin allows level-shifting output swing in single-supply systems without sacrificing CMRR. |
| Robust ESD protection | 13 kV HBM rating with verified IEC 1000-4-2 Level 4 compliance using standard 5 kΩ external resistors. |
Applications
| Bridge Amplifiers | Medical Instrumentation |
|---|---|
Use Scenario: Amplifying mV-level differential output from a 350 Ω strain gauge in a load cell under varying ambient temperatures. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing programmable gain, low drift, and high CMRR to reject common-mode noise from motor drives. Use Value: Enables 16-bit effective resolution with <0.01% gain error and <1.5 μV total offset drift over –40°C to +85°C. |
Use Scenario: Conditioning thermocouple signals in patient temperature monitors where long-term calibration stability is critical. IC Role / Device Role / Timing Role: Low-drift, low-noise front-end amplifier rejecting 50/60 Hz mains interference while preserving microvolt-level ΔT signals. Use Value: Delivers 0.3 μV/°C offset drift and 7.5 nV/√Hz noise, supporting ±0.1°C measurement accuracy over 10-year product lifetime. |
| Thermocouple Amplifiers | Differential to Single-Ended Converters |
Use Scenario: Cold-junction compensated Type-K thermocouple interface in industrial furnace controllers. IC Role / Device Role / Timing Role: High-input-impedance instrumentation amplifier rejecting common-mode noise from heating elements and SCR dimmers. Use Value: 200 GΩ input resistance prevents loading of thermocouple wires; 86 dB CMRR suppresses 120 dBμV conducted noise. |
Use Scenario: Converting LVDS or RS-422 differential bus signals to single-ended logic levels for ADC sampling in test equipment. IC Role / Device Role / Timing Role: Precision gain block with REF pin control to align output swing with ADC input range (e.g., 0–2.5 V). Use Value: Programmable gain (G = 1 to 100) and rail-swing output (±VS – 1.5 V) eliminate level-shifting op amps and reduce BOM count. |
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 (12 MHz vs 12 kHz at G = 1000), lower noise (3.5 nV/√Hz), but requires dual supplies and has no REF pin. | Better suited for high-speed data acquisition; lacks single-supply flexibility and level-shifted output capability. | Select AD8421ARMZ when bandwidth >100 kHz is required and REF-controlled output is unnecessary. |
| INA128UA | Lower max gain (10,000 vs 10,000), higher input bias current (500 pA vs 600 pA), wider offset drift (0.5 μV/°C), no IEC 1000-4-2 certification. | Cost-optimized alternative with reduced ESD robustness and thermal stability; suitable for commercial-grade designs. | Select INA128UA only for cost-sensitive, non-industrial applications where 13 kV ESD and 0.3 μV/°C drift are not required. |
Compared with AD8421ARMZ and INA128UA, the LT1167AIS8 uniquely balances ultra-low drift (0.3 μV/°C), integrated REF pin for single-supply operation, and certified ESD robustness - making it the preferred choice for high-stability, safety-critical industrial sensor interfaces where layout simplicity and long-term calibration retention matter most.
Availability
LT1167AIS8 is available at Aetrix Electronics and suitable for industrial pressure transducers, medical patient monitors, structural health monitoring systems, and aerospace sensor signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for LT1167AIS8 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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1167 family was designed by Linear Technology (acquired by ADI in 2017) specifically for precision DC-coupled sensor signal conditioning - emphasizing low drift, single-resistor gain programming, and robust operation in electrically noisy environments.
FAQ
What is the maximum gain achievable with LT1167AIS8 and how is it set?
The LT1167AIS8 supports gains from 1 to 10,000, set precisely by a single external resistor RG connected between pins 1 and 8. The relationship is G = 1 + 49.4 kΩ/RG; for G = 10,000, RG = 4.94 Ω. The LT1167AIS8 maintains 0.16% max gain error and 26 ppm nonlinearity at G = 1000 over its full –40°C to +85°C operating range.
Does LT1167AIS8 support single-supply operation, and what are the constraints?
Yes, the LT1167AIS8 supports single-supply operation when the REF pin (pin 5) is tied to the negative supply rail (pin 4). This requires both inputs to remain ≥2.1 V above the negative rail and the output to stay within the specified swing limits (e.g., +VS – 1.5 V). The LT1167AIS8 datasheet confirms this configuration works reliably in barometer applications with 3.0 V output swing.
What is the guaranteed input offset voltage drift specification for LT1167AIS8 over temperature?
The LT1167AIS8 guarantees a maximum input offset voltage drift of 0.3 μV/°C over its full operating temperature range of –40°C to +85°C. This is verified in the "ELECTRICAL CHARACTERISTICS" table on page 5 of the official datasheet under parameter VOSI/T, with typical distribution data confirming ≤0.3 μV/°C for 99% of units.
Can LT1167AIS8 drive capacitive loads, and what is the maximum stable value?
Yes, the LT1167AIS8 is explicitly characterized to drive capacitive loads up to 1000 pF in any gain configuration without oscillation or excessive overshoot. Figure 25 in the datasheet shows stable step response with ≤10% overshoot at CL = 1000 pF, confirming suitability for driving ADC input filters or long PCB traces without external isolation resistors.
How does LT1167AIS8 achieve its 13 kV HBM ESD rating, and is external protection needed?
The LT1167AIS8 achieves 13 kV HBM ESD rating through on-chip protection diodes and process hardening. When used with two 5 kΩ external resistors (as shown in the front-page application circuit), it passes IEC 1000-4-2 Level 4 (8 kV contact / 15 kV air). No external TVS or series resistors are required for basic ESD immunity, though layout best practices (short traces, ground plane) remain essential.
LT1167AIS8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1.2V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 pA
- Voltage - Input Offset:
- 15 µV
- Current - Supply:
- 900µA
- Current - Output / Channel:
- 27 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
LT1167AIS8 FAQ
1.How can I place an order for LT1167AIS8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1167AIS8 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 LT1167AIS8 reliable?
The price and inventory of LT1167AIS8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1167AIS8 is usually 5 days.
3.What payment methods are accepted for LT1167AIS8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1167AIS8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1167AIS8?
LT1167AIS8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1167AIS8 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 LT1167AIS8?
For technical support, including LT1167AIS8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1167AIS8 requirements.
6.How does Aetrix verify that LT1167AIS8 is sourced from the original manufacturer or authorized distributors?
All LT1167AIS8 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 LT1167AIS8 meets industry standards.
7.What is the process for return or replacement of LT1167AIS8?
All LT1167AIS8 units undergo pre-shipment inspection (PSI). If there is an issue with LT1167AIS8, 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 LT1167AIS8 part is unused and in its original packaging.
Return procedure for LT1167AIS8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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