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Texas Instruments INA2321EA/2K5
- Part No.:
- INA2321EA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
INA2321EA/2K5.pdf
- Description:
- IC INST AMP 2 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,956
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Product details
Overview
INA2321EA/2K5 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/2K5 datasheet, INA2321EA/2K5 pinout, INA2321EA/2K5 application, or INA2321EA/2K5 equivalent, key selection criteria include shutdown current (<1µA), gain programmability (G = 5 + 5·R₂/R₁), −55°C to +125°C operation, and dual-channel crosstalk rejection (110dB).
Technical Context
The INA2321EA/2K5 implements a modified three-op-amp architecture with internal gain stage (G=5) and external resistor programming, enabling precise differential amplification while maintaining high CMRR up to 3kHz. Its rail-to-rail output stage supports loads ≥25kΩ with <25mV swing from rails at G≥10.
Each channel features independent shutdown control, 500kHz bandwidth at G=5, and input bias current ≤10pA - making it suitable for high-impedance bridge, RTD, and physiological sensors where leakage and power budget are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +5.5V - enables single-supply operation from Li-ion or 3.3V/5V rails without level-shifting. |
| Quiescent Current | 40µA/channel - allows continuous operation in battery-powered field meters and portable ECG devices for months. |
| Input Offset Voltage | ±200µV (max) - ensures sub-0.1% error in 2mV bridge outputs without trimming. |
| CMRR | 94dB at G=5, 1kHz - rejects 50/60Hz line noise in industrial sensor interfaces without external filtering. |
| Bandwidth | 500kHz at G=5 - supports fast step response (8µs to 0.1%) for A/D converter driving at ≤100ksps. |
| Shutdown Current | <1µA/channel - enables multiplexed multi-sensor systems with microsecond wake-up latency. |
| Operating Temperature | −55°C to +125°C - qualified for under-hood automotive and downhole industrial environments. |
Pinout & Package
TSSOP-14 (PW) package: 4.4mm × 5.0mm, 0.65mm pitch, exposed pad optional, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 14 | Shutdown A / Shutdown B | Active-low enable per channel; pulls below 0.8V (at VS=5V) to enter <1µA sleep mode. |
| 2, 13 | VOUT A / VOUT B | Differential output terminals referenced to respective REF pins; rail-to-rail swing ≥(V+)−25mV at G≥10. |
| 3, 12 | REF A / REF B | Output zero-reference voltage; sets common-mode output level and affects input range via VO = (VIN+−VIN−)·G + VREF. |
| 4, 11 | V+ | Positive supply rail shared by both channels; requires local 0.1µF decoupling. |
| 5, 10 | REF B / REF A | Swapped labeling per channel - pin 5 is REF B, pin 10 is REF A (see TI SBOS168D Figure 1). |
| 6, 9 | VOUT B / VOUT A | Output pins physically mirrored; pin 6 = VOUT B, pin 9 = VOUT A (TSSOP top view). |
| 7 | V− | Negative supply rail (ground in single-supply); shared return for both amplifiers. |
| 8 | RG | Gain-setting node; shorted internally to set G=5, or connected externally to program G = 5 + 5·(R₂/R₁). |
| 11 | VIN+ A | Non-inverting input of Channel A; 10¹³Ω input impedance minimizes loading on high-Z sources. |
| 12 | VIN− A | Inverting input of Channel A; matched with VIN+ A for optimal CMRR. |
| 13 | VIN+ B | Non-inverting input of Channel B; electrically isolated from Channel A except via shared V+ and V−. |
| 14 | VIN− B | Inverting input of Channel B; crosstalk to opposite channel is −110dB. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Gain Architecture | G = 5 + 5·(R₂/R₁) with <0.1% gain error - enables precise scaling of mV-level sensor outputs to ADC full-scale without calibration. |
| Ultra-Low Input Bias Current | ≤10pA - eliminates voltage drop across >1MΩ source impedances (e.g., thermistors, pH electrodes). |
| High-Frequency CMRR Retention | 94dB at 1kHz, 75dB at 10kHz - maintains accuracy in noisy industrial bus environments with switching harmonics. |
| Fast Wake-Up from Shutdown | <1µs recovery time - supports time-division multiplexing of multiple INA2321EA/2K5 channels on one PCB. |
| Single-Supply Rail-to-Rail Output | Swings to (V+)−25mV at G≥10 into 25kΩ - directly interfaces with SAR ADCs like ADS7818 without external buffers. |
Applications
| Industrial Bridge Sensing | Medical ECG Front-End |
|---|---|
Use Scenario: Amplifying µV-level differential signals from strain-gauge load cells in factory-floor weighing systems operating at 5V single supply. IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier providing simultaneous gain and common-mode rejection for two independent bridge sensors. Use Value: 40µA/channel quiescent current extends battery life in portable calibrators; 94dB CMRR suppresses 50Hz pickup from nearby motor drives. | Use Scenario: Low-noise front-end for 3-lead ECG monitors used in fitness wearables with strict size and power constraints. IC Role / Device Role / Timing Role: Dual-channel differential amplifier conditioning left-arm/right-arm signals while rejecting right-leg drive common-mode interference. Use Value: ±200µV offset and 10pA bias current prevent baseline drift in DC-coupled configurations; shutdown mode cuts total system current during idle periods. |
| Field Utility Metering | PCMCIA Data Acquisition |
Use Scenario: Isolating and amplifying current-sense shunt voltages in smart electricity meters deployed in outdoor cabinets (-40°C to +85°C). IC Role / Device Role / Timing Role: Precision gain block converting mV shunt drops to 0–2.5V range for 12-bit sigma-delta ADCs. Use Value: −55°C to +125°C rating ensures long-term stability across seasonal temperature swings; 500kHz bandwidth supports harmonic analysis up to 50th order. | Use Scenario: Signal conditioning for legacy PCMCIA cards requiring compact, low-power analog front-ends for vibration or temperature monitoring. IC Role / Device Role / Timing Role: Dual-channel micropower amplifier enabling two independent sensor inputs within tight 44mm × 68mm card footprint. Use Value: TSSOP-14 package fits standard PCMCIA layout constraints; 40µA/channel draw avoids exceeding card's 500mA total power budget. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA2128UA/2K5 | Higher quiescent current (250µA/channel), fixed G=5, no shutdown, SOIC-16 package | Lacks low-power shutdown and gain flexibility; better for cost-sensitive non-battery apps | Select when absolute lowest cost and fixed gain suffice, and PCB space allows SOIC-16. |
| AD8226ARMZ-REEL | Lower quiescent current (350nA), but only 1.5MHz GBW, G=1–1000, MSOP-8 single-channel | Single-channel only; requires two units for dual-sensor use; lower bandwidth limits high-speed sampling | Choose for ultra-low-power battery apps needing only one channel and <1MHz bandwidth. |
Compared with INA2128UA/2K5 and AD8226ARMZ-REEL, the INA2321EA/2K5 uniquely combines dual-channel integration, programmable gain, sub-1µA shutdown, and 500kHz bandwidth in a compact TSSOP-14 - making it optimal for space-constrained, multi-sensor, battery-operated systems requiring precision and flexibility.
Availability
INA2321EA/2K5 is available at Aetrix Electronics and suitable for industrial sensor amplifiers, physiological monitoring equipment, and field utility meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for INA2321EA/2K5 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 90 years of innovation in precision signal chain solutions.
The INA321 family - including the dual-channel INA2321EA/2K5 - was designed specifically for micropower, high-accuracy sensor signal conditioning in harsh environments, balancing rail-to-rail output, wide temperature operation, and programmable gain.
FAQ
What is the maximum gain achievable with the INA2321EA/2K5?
The INA2321EA/2K5 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 gain error remains within ±0.1% (typical) when using 0.1% tolerance, low-TC resistors. The INA2321EA/2K5 datasheet specifies this range across −55°C to +125°C.
Does the INA2321EA/2K5 require external resistors for basic operation?
No - the INA2321EA/2K5 operates at G=5 with RG pin internally shorted. External resistors are optional and only needed to increase gain beyond 5V/V. The device functions fully with just power, input, output, REF, and shutdown connections. This simplifies design for fixed-gain applications while retaining flexibility via the INA2321EA/2K5's RG node.
Can the two channels of the INA2321EA/2K5 be powered independently?
No - both channels share V+ and V− pins and cannot be powered separately. However, each channel has its own dedicated shutdown pin (pins 1 and 14), allowing independent sleep/wake control while maintaining shared supply integrity. This architecture reduces system-level power sequencing complexity and ensures matched thermal behavior between channels in the INA2321EA/2K5.
What is the minimum load resistance the INA2321EA/2K5 can drive while maintaining rail-to-rail output swing?
The INA2321EA/2K5 maintains rail-to-rail output swing (to within 25mV of rails) into loads ≥25kΩ at G≥10 and room temperature. For heavier loads (e.g., 10kΩ), output swing degrades to ~100mV from rails; for 600Ω, an external buffer like OPA340 is recommended per TI application note SBOS168D Figure 4. This specification is verified across the full −55°C to +125°C range for the INA2321EA/2K5.
How does the REF pin affect input common-mode range in the INA2321EA/2K5?
The REF pin directly sets the output zero level and constrains the input common-mode range: upper limit is V+ − 1.2V, lower limit follows VOA1 = 5/4·VCM − 1/4·VREF. For example, with V+ = 5V and VREF = 2.5V, usable VCM spans ~0.55V to 3.8V. Deviations shift this window - a critical design consideration confirmed in the INA2321EA/2K5 typical characteristics (Figure on p.6).
INA2321EA/2K5 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/2K5 FAQ
1.How can I place an order for INA2321EA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA2321EA/2K5 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/2K5 reliable?
The price and inventory of INA2321EA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA2321EA/2K5 is usually 5 days.
3.What payment methods are accepted for INA2321EA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA2321EA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA2321EA/2K5?
INA2321EA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA2321EA/2K5 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/2K5?
For technical support, including INA2321EA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA2321EA/2K5 requirements.
6.How does Aetrix verify that INA2321EA/2K5 is sourced from the original manufacturer or authorized distributors?
All INA2321EA/2K5 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/2K5 meets industry standards.
7.What is the process for return or replacement of INA2321EA/2K5?
All INA2321EA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with INA2321EA/2K5, 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/2K5 part is unused and in its original packaging.
Return procedure for INA2321EA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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