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Texas Instruments OPA2172IDGK
- Part No.:
- OPA2172IDGK
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA2172IDGK.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,449
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Product details
Overview
OPA2172IDGK from Texas Instruments is a dual, rail-to-rail output, 36-V CMOS operational amplifier with 10-MHz gain bandwidth, ±0.2-mV max input offset voltage, and 7-nV/√Hz input voltage noise density. It operates from ±2.25 V to ±18 V supplies and supports precision transducer signal conditioning in industrial power modules.
For engineers reviewing the OPA2172IDGK datasheet, OPA2172IDGK pinout, OPA2172IDGK application, or OPA2172IDGK equivalent, key selection criteria include its rail-to-rail output swing (≤90 mV from rail at 36 V), low quiescent current (1.6 mA per amplifier), wide common-mode range (to within 2 V of V+), and EMI-filtered inputs for robust operation in noisy industrial environments.
Technical Context
The OPA2172IDGK uses high-voltage CMOS input stage architecture enabling full rail-to-rail input operation down to 100 mV below V– and up to 2 V below V+, with no phase reversal on overdrive. Its unity-gain-stable design delivers 10-MHz bandwidth and 10-V/µs slew rate while maintaining <0.00005% THD+N at 1 kHz with 3.5-VRMS output.
It features matched dual-channel performance across –40°C to +125°C, with ±0.3 µV/°C typical offset drift and 120-dB minimum CMRR at DC. Input bias current remains ultra-low (±8 pA typ) due to JFET-input topology, supporting high-impedance sensor interfaces without significant error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +4.5 V to +36 V (single-supply) or ±2.25 V to ±18 V - enables direct interface with 24-V industrial rails and legacy ±15-V systems |
| Gain Bandwidth Product | 10 MHz - supports stable closed-loop operation up to 10× gain at 1 MHz, suitable for active filters and fast-settling data acquisition |
| Input Offset Voltage | ±0.2 mV (max) - ensures ≤200-µV error in 1-V full-scale measurement, critical for strain gauge and RTD amplifiers |
| Input Voltage Noise Density | 7 nV/√Hz at 1 kHz - minimizes contribution to system noise floor in precision analog front-ends |
| Output Voltage Swing | Within 90 mV of rails (RL = 10 kΩ, VS = +36 V) - maximizes dynamic range in single-supply 3.3-V or 5-V ADC driver stages |
| Quiescent Current | 1.6 mA per amplifier - balances speed and power for battery-backed or thermally constrained industrial modules |
| Common-Mode Rejection | 120 dB (min) - rejects supply ripple and ground bounce in high-gain bridge amplifier configurations |
Pinout & Package
VSSOP-8 (DGK) package: 3.00 mm × 3.00 mm, 0.65-mm pitch, exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives loads up to ±75 mA short-circuit current; requires local 100-pF bypass capacitor for stability with capacitive loads |
| 2 | –IN A | Inverting input, channel A - high-impedance node (10¹³ Ω || 4 pF); sensitive to PCB leakage and EMI without guard traces |
| 3 | +IN A | Noninverting input, channel A - accepts common-mode signals from V– – 0.1 V to V+ – 2 V; supports single-supply sensor biasing |
| 4 | V– | Negative supply terminal - must be decoupled to ground with ≥1-µF ceramic capacitor; shared return for both amplifiers |
| 5 | +IN B | Noninverting input, channel B - electrically isolated from channel A; enables independent differential sensing paths |
| 6 | –IN B | Inverting input, channel B - matched offset and drift to channel A; supports dual-channel instrumentation topologies |
| 7 | OUT B | Amplifier B output - identical drive capability to OUT A; allows dual-output configurations like composite amplifiers |
| 8 | V+ | Positive supply terminal - accepts up to +36 V; internal ESD protection clamps transient spikes above V+ + 0.5 V |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Swings within 90 mV of supply rails at 36 V - preserves >97% of full-scale ADC range in single-supply data loggers |
| EMI and RFI filtered inputs | Integrated RC network suppresses >1-kHz RF interference - eliminates need for external ferrite beads in motor-drive feedback loops |
| No phase reversal on overdrive | Input common-mode extends 100 mV beyond V+ without output polarity inversion - prevents latch-up in overvoltage protection circuits |
| Low offset drift | ±0.3 µV/°C (typ) - contributes <0.45 µV error over 150°C industrial temperature range, enabling uncalibrated operation |
| High open-loop gain | 107 dB (min) - ensures <0.001% gain error in unity-gain buffer applications with 10-kΩ source impedance |
Applications
| Tracking Amplifier in Power Modules | Bridge Amplifier |
|---|---|
Use Scenario: Closed-loop voltage regulation in 24-V merchant power supplies using MOSFET gate drivers. IC Role / Device Role / Timing Role: Dual op-amp configures as error amplifier and current-sense comparator with shared reference. Use Value: 10-MHz bandwidth enables fast transient response (<2 µs settling), while rail-to-rail output maximizes control headroom across line/load variations. |
Use Scenario: Amplifying differential output from load-cell Wheatstone bridges in factory automation scales. IC Role / Device Role / Timing Role: Instrumentation amplifier front-end with matched dual channels rejecting common-mode noise from 50/60-Hz mains. Use Value: 120-dB CMRR and ±0.2-mV offset ensure ≤0.01% full-scale error at 25°C, meeting Class III weighing accuracy standards. |
| Temperature Measurements | Strain Gauge Amplifiers |
Use Scenario: Linearizing and amplifying output from Pt100 RTD sensors in HVAC control panels. IC Role / Device Role / Timing Role: Constant-current excitation source and low-noise signal conditioner in 4-wire configuration. Use Value: 7-nV/√Hz noise density and ±8-pA input bias minimize self-heating errors and Johnson noise in high-resistance sensor legs. |
Use Scenario: Signal conditioning for bonded foil strain gauges in structural health monitoring of wind turbine blades. IC Role / Device Role / Timing Role: Precision differential amplifier with programmable gain and offset trimming via external resistors. Use Value: ±0.3 µV/°C drift and 10-MHz bandwidth support dynamic strain capture up to 10 kHz with <0.05% nonlinearity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-voltage op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2182IDGKT | Lower offset (±4 µV), lower noise (5.7 nV/√Hz), but 2-MHz GBP and higher IQ (700 µA per amp) | Better DC precision, worse AC performance; suited for static sensor readouts, not fast transients | Select OPA2182IDGKT when microvolt-level offset stability outweighs bandwidth needs |
| AD8638ARZ-REEL7 | Wider supply (±18 V), lower IQ (1.2 mA), but only 1.2-MHz GBP and no rail-to-rail output | Limited dynamic range near rails; unsuitable for 3.3-V ADC drivers requiring full-scale swing | Select AD8638ARZ-REEL7 for ultra-low-power battery-operated devices where bandwidth <1 MHz suffices |
Compared with OPA2172IDGK, OPA2182IDGKT trades bandwidth for superior DC accuracy, while AD8638ARZ-REEL7 reduces power at the cost of output swing and speed-making OPA2172IDGK the balanced choice for industrial signal chains demanding simultaneous precision, speed, and rail-to-rail operation.
Availability
OPA2172IDGK is available at Aetrix Electronics and suitable for industrial power modules, precision transducer interfaces, bridge amplifier circuits, and temperature measurement systems requiring stable component supply across extended temperature ranges.
Supply support for OPA2172IDGK 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 high-reliability industrial and automotive-grade components.
The OPAx172 family was designed specifically for high-voltage, low-noise industrial signal conditioning-targeting applications where rail-to-rail output, EMI resilience, and wide temperature operation are mandatory.
FAQ
What is the maximum supply voltage rating for the OPA2172IDGK?
The OPA2172IDGK has an absolute maximum supply voltage rating of 40 V across V+ and V– terminals. Its recommended operating range is +4.5 V to +36 V (single-supply) or ±2.25 V to ±18 V (dual-supply). Operation beyond ±18 V risks permanent damage, and sustained use above 36 V violates JEDEC stress limits defined in the SBOS618I datasheet.
Does the OPA2172IDGK support rail-to-rail input operation?
The OPA2172IDGK supports rail-to-rail input operation down to 100 mV below V– and up to 2 V below V+ under normal conditions. It can tolerate input voltages up to V+ + 0.1 V without phase reversal, though performance degrades within 2 V of V+. This behavior is explicitly documented in Section 3 of the SBOS618I datasheet.
What is the typical input bias current of the OPA2172IDGK at 25°C?
The typical input bias current of the OPA2172IDGK is ±8 pA at 25°C, with a maximum of ±15 pA over the full –40°C to +125°C temperature range. This ultra-low value is enabled by its JFET-input CMOS architecture and is confirmed in Table 7.7 of the SBOS618I datasheet under Electrical Characteristics.
Can the OPA2172IDGK drive a 600-Ω load effectively?
Yes-the OPA2172IDGK delivers rail-to-rail output swing even into 600-Ω loads, with typical output voltage swing of 330–400 mV from each rail at ±18 V supply. Its ±75-mA short-circuit current capability ensures stable operation without thermal shutdown, as verified in Figure 9 of the SBOS618I datasheet.
Is the OPA2172IDGK pin-compatible with other members of the OPAx172 family?
The OPA2172IDGK in VSSOP-8 (DGK) package shares identical pinout with OPA2172IDR (SOIC-8) and OPA2172YDRGR (WSON-8), per Pin Functions table on page 6 of SBOS618I. However, it is not pin-compatible with OPA172 (5-pin) or OPA4172 (14-pin) variants due to differing channel count and footprint.
OPA2172IDGK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 10 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 8 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 1.6mA (x2 Channels)
- Current - Output / Channel:
- 75 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
OPA2172IDGK FAQ
1.How can I place an order for OPA2172IDGK through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2172IDGK 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 OPA2172IDGK reliable?
The price and inventory of OPA2172IDGK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2172IDGK is usually 5 days.
3.What payment methods are accepted for OPA2172IDGK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2172IDGK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2172IDGK?
OPA2172IDGK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2172IDGK 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 OPA2172IDGK?
For technical support, including OPA2172IDGK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2172IDGK requirements.
6.How does Aetrix verify that OPA2172IDGK is sourced from the original manufacturer or authorized distributors?
All OPA2172IDGK 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 OPA2172IDGK meets industry standards.
7.What is the process for return or replacement of OPA2172IDGK?
All OPA2172IDGK units undergo pre-shipment inspection (PSI). If there is an issue with OPA2172IDGK, 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 OPA2172IDGK part is unused and in its original packaging.
Return procedure for OPA2172IDGK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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