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Texas Instruments INA350CDSIDDFR
- Part No.:
- INA350CDSIDDFR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
INA350CDSIDDFR.pdf
- Description:
- TINY (2-MM 2-MM), LOW-POWER (100
- Quantity:
- Payment:
- Shipping:
Inventory:16,643
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Product details
Overview
INA350CDSIDDFR from Texas Instruments is a selectable-gain instrumentation amplifier optimized for low-power, space-constrained 10-bit to 14-bit data acquisition systems. It provides G = 30 or G = 50 gain options via the GS pin, delivers 95 dB typical CMRR, 0.075% typical gain error at G = 30, and consumes only 100 µA typical quiescent current - enabling use in battery-powered wearable fitness monitors and portable medical sensors.
For engineers reviewing the INA350CDSIDDFR datasheet, INA350CDSIDDFR pinout, INA350CDSIDDFR application, or INA350CDSIDDFR equivalent, key selection criteria include its dual-gain selectability (G = 30/50), ultra-low IQ, 8-pin SOT-23-THN (DDF) package footprint (4.64 mm²), and guaranteed performance across –40°C to 125°C.
Technical Context
The INA350CDSIDDFR implements a precision three-op-amp instrumentation architecture with integrated, laser-trimmed thin-film resistors - eliminating external gain-setting components and ensuring matched ratio accuracy. Its gain-select logic (GS pin) directly configures internal resistor networks to deliver exact G = 30 or G = 50 transfer functions without external feedback.
It features rail-to-rail output swing, reference input (REF) with 60 kΩ impedance and unity gain, shutdown control (SHDN) with 100 µs enable time, and robust EMI rejection (96 dB at 1 GHz). All specifications are guaranteed over 1.8 V to 5.5 V supply and full industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Options | G = 30 or G = 50 - selected by logic level on GS pin; no external resistors required |
| CMRR (typ) | 95 dB - ensures high rejection of common-mode noise in bridge sensor interfaces |
| Gain Error (typ) | 0.075% at G = 30; 0.082% at G = 50 - enables direct interface to 12-bit ADCs without calibration |
| Quiescent Current | 100 µA (typ) - supports multi-year operation on coin-cell batteries in wearables |
| Bandwidth | 40 kHz at G = 30 - sufficient for static and quasi-static sensor signals (e.g., pressure, weight) |
| Input Offset Voltage | ±0.2 mV (typ) - minimizes zero-error in precision weigh scale and glucose meter front-ends |
| Supply Range | 1.8 V to 5.5 V single-supply - compatible with Li-ion, alkaline, and USB-powered systems |
Pinout & Package
INA350CDSIDDFR is housed in an 8-pin SOT-23-THN (DDF) package measuring 1.60 mm × 2.90 mm (4.64 mm²), optimized for high-density PCB layouts in portable devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GS | Gain Select digital input | Logic low → G = 30; logic high → G = 50; NC → defaults to G = 50 |
| 2 - IN– | Inverting input | Negative input of first-stage differential pair; accepts bridge low-side signal |
| 3 - IN+ | Non-inverting input | Positive input of first-stage differential pair; accepts bridge high-side signal |
| 4 - V– | Negative supply | Ground or negative rail connection; thermal pad must be connected to V– |
| 5 - REF | Reference input | DC bias point for output; must be driven by low-impedance source (e.g., voltage divider or buffer) |
| 6 - OUT | Analog output | Single-ended amplified output referenced to REF; drives 500 pF with <20% overshoot |
| 7 - V+ | Positive supply | Primary power rail; supports 1.8 V to 5.5 V operation |
| 8 - SHDN | Shutdown control input | Logic high → active; logic low → shutdown (IQSD ≤ 1.25 µA); fast 4 µs disable time |
Key Features
| Feature | Design Value |
|---|---|
| Integrated precision gain resistors | Eliminates external 0.1% resistors, reduces BOM count, and avoids layout-induced mismatch errors |
| Selectable dual gain (G = 30 / 50) | Enables flexible system calibration and dynamic range optimization without hardware change |
| Ultra-low 100 µA quiescent current | Extends battery life in always-on sensing nodes; supports duty-cycled operation with fast 100 µs wake-up |
| 96 dB EMI rejection at 1 GHz | Suppresses RF interference from cellular/Wi-Fi radios in compact wearable enclosures |
| –40°C to 125°C operating range | Validated for automotive cabin modules, industrial transmitters, and medical diagnostic equipment |
Applications
| Wearable Fitness Monitor | Weigh Scale System |
|---|---|
Use Scenario: Measuring microvolt-level bio-potential or strain gauge signals from motion/force sensors during activity tracking. IC Role / Device Role / Timing Role: Front-end instrumentation amplifier converting differential bridge output to single-ended signal for 12-bit SAR ADC. Use Value: G = 30 gain setting matches typical piezoresistive sensor full-scale output; 100 µA IQ enables >1-year coin-cell operation. |
Use Scenario: Amplifying millivolt-level output from load cell bridges in consumer and commercial weighing platforms. IC Role / Device Role / Timing Role: Precision gain stage providing stable, low-drift amplification before sigma-delta ADC conversion. Use Value: 0.075% gain error at G = 30 eliminates need for per-unit gain calibration; 95 dB CMRR rejects power-line noise. |
| Blood Glucose Meter | Industrial Flow Transmitter |
Use Scenario: Amplifying amperometric current from electrochemical test strips with minimal offset drift. IC Role / Device Role / Timing Role: Low-noise, low-power signal conditioner interfacing disposable sensor cartridges to MCU ADC. Use Value: ±0.2 mV offset and ±0.6 µV/°C drift ensure accurate glucose concentration calculation across ambient temperature shifts. |
Use Scenario: Conditioning differential output from magnetic or ultrasonic flow sensor bridges in harsh industrial environments. IC Role / Device Role / Timing Role: Rugged front-end amplifier delivering stable gain and high CMRR in 4–20 mA loop-powered transmitters. Use Value: Guaranteed operation from –40°C to 125°C and 1.8 V minimum supply support wide-input-range field devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA350CDSIDSGR | Same die, identical electrical specs, but in 8-pin WSON (DSG) package (2.0 mm × 2.0 mm) | Requires different PCB land pattern and reflow profile; better thermal performance (RθJA = 89.2°C/W vs 169.1°C/W) | Select for higher power density or improved thermal management where board area allows DSG footprint. |
| INA333AIDDFR | Fixed-G = 100, 100 µA IQ, same DDF package; lacks gain select and has higher gain error (0.25% max) | Suitable only for fixed-high-gain applications; no G = 30/50 flexibility or low-noise advantage at mid-gains | Choose only if system requires G = 100 and gain select is unnecessary; not a functional substitute for dual-gain requirement. |
Compared with INA350CDSIDSGR and INA333AIDDFR, the INA350CDSIDDFR uniquely delivers programmable mid-range gains (30/50) in the smallest SOT-23 footprint, enabling optimal signal chain SNR and layout flexibility for portable sensor nodes.
Availability
INA350CDSIDDFR is available at Aetrix Electronics and suitable for wearable fitness monitors, portable medical diagnostics, industrial flow transmitters, and weigh scale systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for INA350CDSIDDFR 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision signal conditioning and low-power design.
The INA350 product line was developed to replace discrete op-amp + resistor instrumentation designs in cost- and size-sensitive 10–14-bit measurement systems, emphasizing integrated accuracy, ultra-low power, and simplified layout.
FAQ
What gain options does the INA350CDSIDDFR support, and how are they selected?
The INA350CDSIDDFR supports two precise gain options: G = 30 and G = 50. These are selected using the GS (Gain Select) pin: applying logic low (≤ V– + 0.2 V) selects G = 30, while logic high (≥ V– + 1 V) selects G = 50. Leaving GS unconnected defaults to G = 50. This eliminates external resistors and ensures matched gain accuracy across temperature and process variation - a core feature of the INA350CDSIDDFR.
Does the INA350CDSIDDFR require external resistors for gain configuration?
No, the INA350CDSIDDFR does not require external resistors for gain configuration. It integrates precision laser-trimmed thin-film resistors internally, enabling exact G = 30 or G = 50 transfer functions based solely on the GS pin state. This reduces bill-of-materials cost, eliminates resistor matching tolerances, saves PCB area, and improves long-term stability - all confirmed in the INA350CDSIDDFR datasheet specifications and functional description.
What is the operating temperature range for the INA350CDSIDDFR?
The INA350CDSIDDFR is fully specified and tested over an operating temperature range of –40°C to +125°C. This includes all key parameters - gain error, CMRR, offset voltage, and quiescent current - validated across the full range. The extended range supports deployment in automotive cabin modules, industrial field transmitters, and medical devices subject to wide ambient thermal swings, as documented in Section 7.3 of the INA350CDSIDDFR datasheet.
How does the shutdown function work on the INA350CDSIDDFR?
The INA350CDSIDDFR uses the SHDN pin for low-power shutdown: applying logic high (≥ V– + 1 V) enables the amplifier, while logic low (≤ V– + 0.2 V) disables it, reducing quiescent current to ≤ 1.25 µA. The device achieves fast disable (tOFF = 4 µs) and enable (tON = 100 µs) times, making it ideal for duty-cycled sensing in battery-powered applications like wearable fitness trackers using the INA350CDSIDDFR.
Can the INA350CDSIDDFR drive capacitive loads, and what is its maximum rated value?
Yes, the INA350CDSIDDFR is designed to drive capacitive loads up to 500 pF while maintaining stability and limiting overshoot to less than 20%, as verified in typical characteristics (Figure 7-39). This capability allows direct connection to ADC input capacitors or long PCB traces without external isolation resistors - a key specification confirmed for the INA350CDSIDDFR across all gain settings and supply voltages.
INA350CDSIDDFR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.24V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 100 kHz
- Current - Input Bias:
- 0.65 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 100µA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 1.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
INA350CDSIDDFR FAQ
1.How can I place an order for INA350CDSIDDFR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA350CDSIDDFR 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 INA350CDSIDDFR reliable?
The price and inventory of INA350CDSIDDFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA350CDSIDDFR is usually 5 days.
3.What payment methods are accepted for INA350CDSIDDFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA350CDSIDDFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA350CDSIDDFR?
INA350CDSIDDFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA350CDSIDDFR 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 INA350CDSIDDFR?
For technical support, including INA350CDSIDDFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA350CDSIDDFR requirements.
6.How does Aetrix verify that INA350CDSIDDFR is sourced from the original manufacturer or authorized distributors?
All INA350CDSIDDFR 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 INA350CDSIDDFR meets industry standards.
7.What is the process for return or replacement of INA350CDSIDDFR?
All INA350CDSIDDFR units undergo pre-shipment inspection (PSI). If there is an issue with INA350CDSIDDFR, 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 INA350CDSIDDFR part is unused and in its original packaging.
Return procedure for INA350CDSIDDFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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