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Texas Instruments INA2321EA/250
- Part No.:
- INA2321EA/250
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
INA2321EA/250.pdf
- Description:
- IC INST AMP 2 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,893
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Product details
Overview
INA2321EA/250 from Texas Instruments is a dual-channel, rail-to-rail output, micropower CMOS instrumentation amplifier in TSSOP-14 package, delivering 40µA/channel quiescent current, ±200µV input offset voltage, and 94dB CMRR at G=5 - optimized for low-power sensor signal conditioning in industrial and medical systems.
For engineers reviewing the INA2321EA/250 datasheet, INA2321EA/250 pinout, INA2321EA/250 application, or INA2321EA/250 equivalent, key selection factors include dual-channel micropower operation (≤40µA/ch), user-programmable gain via external resistors (G = 5 + 5·R₂/R₁), shutdown mode (<1µA total), −55°C to +125°C temperature range, and TSSOP-14 thermal performance (θJA = 150°C/W).
Technical Context
The INA2321EA implements a modified three-op-amp instrumentation architecture with integrated gain stage, enabling precise differential amplification while maintaining rail-to-rail output swing (to V+ − 0.02V at G ≥ 10) and high common-mode rejection up to 3kHz. Its CMOS input stage delivers 10pA bias current and 10¹³Ω || 3pF input impedance.
Gain is externally set via resistor network between pins 1/5/6 (RG configuration), supporting 5–1000V/V range with ±0.1% max gain error and ±2ppm/°C drift at G=5. Shutdown control operates independently per channel with <1µA total quiescent draw and microsecond wake-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +5.5V - supports single-supply battery-powered and industrial 3.3V/5V systems without level-shifting. |
| Quiescent Current | 40µA per channel - enables multi-year operation on coin-cell batteries in portable sensor nodes. |
| Input Offset Voltage | ±0.2mV (typ), ±0.5mV (max) at +25°C - ensures sub-LSB error in 12-bit ADC interfacing without trimming. |
| CMRR | 94dB at G=5, 1kHz - rejects line-frequency interference in bridge sensor and ECG front-ends. |
| Bandwidth | 500kHz at G=5 - sufficient for fast-sampling data acquisition up to 100kSPS with adequate phase margin. |
| Output Swing | Rail-to-rail (to V+ − 25mV, G ≥ 10, RL ≥ 25kΩ) - maximizes dynamic range into ADC reference rails. |
| Operating Temperature | −55°C to +125°C - qualified for under-hood automotive, downhole, and industrial control environments. |
Pinout & Package
TSSOP-14 (PW) package: 4.4mm × 5.0mm body, 0.65mm pitch, exposed thermal pad (not electrically connected), JEDEC MO-153 compliant, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 6 | RG terminals (Channel A) | Set gain for Channel A using external resistor network: GA = 5 + 5·R₂/R₁. |
| 2, 3 | VIN−A, VIN+A | Differential inputs for Channel A; 10¹³Ω input impedance enables direct connection to high-Z sensors. |
| 4 | V− | Negative supply rail - must be connected to system ground or negative rail; no internal charge pump. |
| 7, 10 | Shutdown A, Shutdown B | Active-low enable pins; pull ≤0.8V (at V+ = 5V) to enter <1µA shutdown per channel. |
| 8, 13 | VOUTA, VOUTB | Rail-to-rail outputs; drive 25kΩ loads to within 25mV of rails; stable with ≥50pF capacitive load. |
| 9, 12 | REFA, REFB | Reference inputs defining zero-output level for each channel; require low-impedance source to maintain CMRR. |
| 11, 14 | VIN−B, VIN+B | Differential inputs for Channel B - identical specs and layout symmetry to Channel A. |
| 14 | V+ | Positive supply rail - decoupling capacitor (0.1µF) required adjacent to pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel shutdown | Independent control reduces total system current to <1µA when either channel is idle - critical for time-multiplexed sensor arrays. |
| User-programmable gain | External resistor ratio sets gain from 5 to 1000V/V with ±0.1% max error - eliminates fixed-gain limitations in multi-range measurement systems. |
| High-precision CMOS input | 10pA bias current and ±200µV offset enable accurate amplification of µV-level thermistor and strain gauge signals without calibration drift. |
| Wide common-mode range | 0.35V to (V+ − 1.2V) at V+ = 2.7V - accommodates unbalanced bridge outputs and floating sensor references in single-supply designs. |
| Low-noise performance | 100nV/√Hz @ 1kHz, 20µVPP (0.1–10Hz) - preserves signal integrity in low-frequency physiological monitoring (ECG/EMG). |
Applications
| Industrial Bridge Sensing | Medical ECG Front-End |
|---|---|
Use Scenario: Amplifying mV-level differential output from 350Ω strain gauges in load cells and pressure transducers powered by 3.3V single supply. IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier providing matched gain and CMRR to reject power-supply ripple and EMI in noisy factory environments. Use Value: 40µA/channel quiescent current extends battery life in wireless condition-monitoring nodes; ±200µV offset ensures <0.1% full-scale error at 10mV input. |
Use Scenario: Low-noise, low-power amplification of 0.5–2mV differential ECG signals from limb electrodes in portable fitness monitors. IC Role / Device Role / Timing Role: Dual-channel IA with independent shutdown enables sequential lead acquisition (RA/LA/LL) to minimize cross-talk and power consumption. Use Value: 10pA input bias current prevents electrode polarization errors; 94dB CMRR suppresses 50/60Hz mains interference without aggressive filtering. |
| Field Utility Metering | PCMCIA Data Acquisition |
Use Scenario: Isolated current sensing in smart electricity meters using shunt resistors and isolated ADCs operating at 3.3V. IC Role / Device Role / Timing Role: Precision gain stage converting shunt voltage to ADC-compatible levels while rejecting common-mode voltage up to 1.5V. Use Value: −55°C to +125°C rating ensures reliability in outdoor meter enclosures; rail-to-rail output drives SAR ADCs directly without level-shifting. |
Use Scenario: Signal conditioning for modular PCMCIA cards used in portable test equipment requiring dual analog channels in minimal board area. IC Role / Device Role / Timing Role: Dual-channel micropower IA occupying single TSSOP-14 footprint - replaces two discrete MSOP-8 IAs to save PCB space and BOM count. Use Value: TSSOP-14 package (4.4 × 5.0 mm) reduces footprint by 35% vs dual MSOP-8; same pinout as INA321E family simplifies layout reuse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA333AIDGKR | Single-channel, 50µA IQ, 25ppm/°C gain drift, 0.01% gain error, VSSOP-8 | Lower power precision for single-ended channel needs; lacks dual-channel integration and independent shutdown. | Select when only one channel is required and ultra-low gain drift (25ppm/°C) outweighs dual-channel convenience. |
| AD8226ARMZ-R7 | Single-channel, 300µA IQ, 150µV offset, 120dB CMRR, MSOP-8 | Higher power, higher CMRR, but no shutdown mode; requires external reference buffer for best performance. | Choose for high-EMI environments where 120dB CMRR is mandatory and 300µA IQ is acceptable. |
Compared with INA333AIDGKR and AD8226ARMZ-R7, the INA2321EA/250 uniquely combines dual-channel operation, per-channel shutdown (<1µA), and 40µA/channel quiescent current - making it optimal for battery-powered multiplexed sensor systems where channel density and ultra-low standby power are critical.
Availability
INA2321EA/250 is available at Aetrix Electronics and suitable for industrial sensor amplifiers, physiological monitoring devices, field utility meters, and PCMCIA data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for INA2321EA/250 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 over 50 years of innovation in precision signal chain components.
The INA321 family - including the dual-channel INA2321EA - was designed for micropower, high-accuracy differential signal conditioning in battery-operated and harsh-environment instrumentation systems.
FAQ
What is the maximum gain achievable with INA2321EA/250?
The INA2321EA/250 supports externally programmable gain from 5V/V to 1000V/V using the equation G = 5 + 5·(R₂/R₁). At G = 1000, bandwidth reduces to ~5kHz, and stability requires careful attention to feedback capacitance and layout parasitics. The device maintains ±0.1% gain accuracy up to G = 100 under specified conditions.
Does INA2321EA/250 support true rail-to-rail input common-mode range?
No. The INA2321EA/250 has an input common-mode range of 0.35V to (V+ − 1.2V) at V+ = 2.7V, and 0.55V to (V+ − 1.2V) at V+ = 5V. It does not accept inputs at the negative rail (V−) or within 1.2V of V+. This limitation arises from the internal A2 amplifier's input stage and must be accounted for in single-supply bridge or RTD biasing networks.
How does shutdown mode affect output impedance and channel isolation in INA2321EA/250?
When INA2321EA/250 enters shutdown (via low signal on Shutdown A or B), the corresponding output transitions to high-impedance state (>100MΩ), effectively disconnecting that channel from downstream circuitry. Crosstalk between active and shutdown channels remains >110dB, enabling reliable multiplexing without external analog switches.
Can INA2321EA/250 drive a 600Ω load directly?
No. The INA2321EA/250 is optimized for loads ≥25kΩ. Driving 600Ω causes significant output swing degradation (≥100mV from rail) and potential instability. For low-impedance loads, TI recommends buffering with OPA340 - as documented in Figure 4 of the SBOS168D datasheet - which maintains rail-to-rail swing into 600Ω.
What is the recommended decoupling for INA2321EA/250 power pins?
Each V+ pin (Pin 14) requires a 0.1µF ceramic capacitor placed within 2mm of the pin and connected directly to the nearest V− (Pin 4) ground plane. For noisy environments, add a 10µF tantalum or aluminum electrolytic capacitor in parallel at the board-level power entry point. Avoid shared traces between channels to prevent crosstalk.
INA2321EA/250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.4V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 500 kHz
- Current - Input Bias:
- 10 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- -
- Current - Output / Channel:
- 16 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
INA2321EA/250 FAQ
1.How can I place an order for INA2321EA/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA2321EA/250 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 INA2321EA/250 reliable?
The price and inventory of INA2321EA/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA2321EA/250 is usually 5 days.
3.What payment methods are accepted for INA2321EA/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA2321EA/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA2321EA/250?
INA2321EA/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA2321EA/250 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 INA2321EA/250?
For technical support, including INA2321EA/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA2321EA/250 requirements.
6.How does Aetrix verify that INA2321EA/250 is sourced from the original manufacturer or authorized distributors?
All INA2321EA/250 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 INA2321EA/250 meets industry standards.
7.What is the process for return or replacement of INA2321EA/250?
All INA2321EA/250 units undergo pre-shipment inspection (PSI). If there is an issue with INA2321EA/250, 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 INA2321EA/250 part is unused and in its original packaging.
Return procedure for INA2321EA/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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