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Texas Instruments OPA4205APWT
- Part No.:
- OPA4205APWT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
OPA4205APWT.pdf
- Description:
- LOW-POWER LOW-NOISE FOUR-CHANNEL
- Quantity:
- Payment:
- Shipping:
Inventory:209
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Product details
Overview
OPA4205APWT from Texas Instruments is a quad-channel, precision bipolar e-trim™ operational amplifier with super-beta inputs, 4 µV typical input offset voltage, ±0.08 µV/°C max drift, and 7.2 nV/√Hz voltage noise density at 1 kHz. It operates from ±2.25 V to ±18 V (4.5–36 V single supply), delivers rail-to-rail output swing, and targets high-accuracy analog signal conditioning in space-constrained instrumentation.
For engineers reviewing the OPA4205APWT datasheet, OPA4205APWT pinout, OPA4205APWT application, or OPA4205APWT equivalent, this page provides verified specifications, package mapping to TSSOP-14, real-world use context for DAQ and SMU systems, and two production-ready alternative options with documented functional trade-offs.
Technical Context
The OPA4205APWT implements TI's proprietary e-trim™ technology on a bipolar process to achieve ultra-low offset and drift without chopper-induced artifacts. Its super-beta input stage delivers 100 pA typical input bias current and 110 fA/√Hz current noise density - enabling high-impedance sensor interfacing without significant DC error or noise degradation.
With 3.6 MHz gain-bandwidth, 4 V/µs slew rate, and >126 dB AOL/CMRR/PSRR across –40°C to +125°C, it supports stable closed-loop operation in precision DC-coupled amplifiers, active filters, and low-power transducer signal chains where long-term stability and low 1/f noise are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | ±4 µV typical (±25 µV max over temp); enables <1 LSB error in 20-bit systems with 5 V full-scale. |
| Offset Voltage Drift | ±0.08 µV/°C max; contributes <1 µV total drift over 100°C range - suitable for uncalibrated industrial sensors. |
| Gain Bandwidth Product | 3.6 MHz; supports stable unity-gain buffers and 2nd-order anti-aliasing filters up to ~300 kHz. |
| Quiescent Current | 220 µA per amplifier (max 240 µA); allows four channels to operate below 1 mA total - ideal for battery-powered DAQ. |
| Voltage Noise Density | 7.2 nV/√Hz at 1 kHz; dominates total integrated noise in bandwidths >10 Hz - critical for low-noise amplification of microvolt-level signals. |
| Common-Mode Rejection | 124 dB min over full temperature range; rejects >300 µV of common-mode interference per volt of CM shift in precision differential sensing. |
| Supply Range | ±2.25 V to ±18 V (4.5–36 V single supply); supports direct interface with 3.3 V, 5 V, 12 V, and 24 V industrial rails without level-shifting. |
Pinout & Package
OPA4205APWT is packaged in a 14-pin TSSOP (PW) with exposed thermal pad. The package measures 5.0 mm × 4.4 mm × 1.2 mm and is RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN A (Pin 3) | Noninverting input, Channel A | High-impedance node (300 GΩ || 4.4 pF) for precision DC-coupled signal injection; requires guarded layout near sensitive sources. |
| –IN A (Pin 2) | Inverting input, Channel A | Used with feedback network to set gain; input bias current (≤500 pA) minimizes resistor-generated offset in high-Z networks. |
| OUT A (Pin 1) | Output, Channel A | Rail-to-rail capable (within 200 mV of rails at 10 kΩ load); drives capacitive loads ≤30 pF stably without external compensation. |
| V+ (Pin 4) | Positive power supply | Connects to highest supply rail; decoupling capacitor (0.1 µF ceramic) required within 5 mm for PSRR integrity above 10 kHz. |
| V– (Pin 11) | Negative power supply | Connects to lowest supply rail; shares same decoupling best practice as V+ to maintain common-mode rejection symmetry. |
| +IN B (Pin 5), –IN B (Pin 6), OUT B (Pin 7) | Channel B inputs/outputs | Electrically identical to Channel A; independent operation enables dual-sensor conditioning or matched gain/phase paths. |
| +IN C (Pin 10), –IN C (Pin 9), OUT C (Pin 8) | Channel C inputs/outputs | Same performance as Channels A/B; pinout symmetry simplifies PCB routing for multi-channel synchronous sampling. |
| +IN D (Pin 12), –IN D (Pin 13), OUT D (Pin 14) | Channel D inputs/outputs | Enables full quad-channel operation; all four amplifiers share V+ and V–, reducing supply filtering complexity in compact layouts. |
Key Features
| Feature | Design Value |
|---|---|
| e-trim™ architecture | Eliminates laser trimming; achieves ±4 µV typical offset and ±0.08 µV/°C drift without chopper modulation artifacts or 1/f noise folding. |
| Super-beta input stage | Delivers 100 pA typical input bias current and 110 fA/√Hz current noise - essential for photodiode, strain gauge, and pH electrode interfaces. |
| Rail-to-rail output | Swings within 200 mV of either rail at 10 kΩ load, maximizing dynamic range in low-voltage single-supply systems (e.g., 3.3 V DAQ). |
| EMI/RFI filtered inputs | Integrated input filtering suppresses >80 dB of RF interference up to 1 GHz - prevents measurement corruption in noisy industrial environments. |
| Overload power limiter | Prevents thermal runaway during output short-circuit events; limits dissipation without latch-up, supporting robust field-deployed instrumentation. |
Applications
| Flow Transmitter Signal Conditioning | Source Measurement Unit (SMU) Feedback Amplifier |
|---|---|
|
Use Scenario: Amplifying low-level mV outputs from Coriolis or magnetic flow sensors in hazardous-area loop-powered transmitters. IC Role / Device Role / Timing Role: Precision DC-coupled instrumentation amplifier front-end with 24-bit ADC driver capability and 125°C ambient rating. Use Value: ±25 µV max offset ensures <0.01% full-scale error over temperature; low quiescent current extends loop power budget for 4–20 mA designs. |
Use Scenario: Closed-loop current/voltage control in semiconductor parametric test equipment requiring sub-nA sourcing accuracy. IC Role / Device Role / Timing Role: High-stability transimpedance amplifier and voltage reference buffer in SMU feedback path. Use Value: 110 fA/√Hz current noise and 100 pA input bias enable <100 pA measurement resolution; 124 dB CMRR rejects supply coupling in multi-channel SMUs. |
| Data Acquisition (DAQ) System Input Stage | Pressure Transmitter Analog Front-End |
|
Use Scenario: Multiplexed sensor signal conditioning in portable handheld DAQ units powered by Li-ion batteries. IC Role / Device Role / Timing Role: Quad-channel simultaneous-sampling analog front-end with matched gain/offset across all channels. Use Value: 220 µA per channel enables four-channel operation under 1 mA total; rail-to-rail output maximizes SNR with 16-bit SAR ADCs. |
Use Scenario: Amplifying millivolt-level bridge outputs from piezoresistive pressure sensors in HVAC and process control modules. IC Role / Device Role / Timing Role: Low-drift, low-noise difference amplifier with programmable gain and cold-junction compensation support. Use Value: ±0.08 µV/°C drift eliminates need for frequent recalibration; EMI filtering maintains accuracy in electrically noisy factory floors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4188APW | Zero-drift auto-zero architecture; 0.003 µV/°C drift, but higher 1/f noise and 1.2 µVPP 0.1–10 Hz noise vs OPA4205APWT's 0.2 µVPP. | Better for ultra-low-drift DC applications (<1 µV total drift over 100°C), worse for wideband low-noise AC-coupled sensing. | Select OPA4188APW only when drift dominates noise requirements; verify stability with capacitive loads due to auto-zero switching artifacts. |
| AD8628ARUZ-REEL | Zero-drift design; 0.5 µV max offset, 0.002 µV/°C drift, but 250 µA quiescent current per amp and no rail-to-rail output (clips 1.2 V from rails). | Suitable for ultra-low-offset lab instruments with ample supply headroom; unsuitable for low-voltage or battery-powered systems. | Choose AD8628ARUZ-REEL only in fixed-line-powered applications where absolute offset minimization outweighs power and output swing constraints. |
Compared with OPA4205APWT, OPA4188APW trades lower drift for higher 0.1–10 Hz noise and potential switching artifacts, while AD8628ARUZ-REEL offers superior offset spec but sacrifices rail-to-rail output and doubles quiescent current - making OPA4205APWT optimal for balanced precision, noise, power, and output flexibility in industrial DAQ and transmitter designs.
Availability
OPA4205APWT is available at Aetrix Electronics and suitable for flow transmitters, source measurement units (SMUs), and portable data acquisition (DAQ) systems requiring stable component supply, long-term calibration integrity, and extended temperature operation.
Supply support for OPA4205APWT 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 heritage in precision op-amp innovation and industrial-grade reliability.
The OPAx205 family was designed specifically for high-accuracy, low-power signal conditioning in industrial process control, test equipment, and sensor interface applications - succeeding the OPAx277 with improved drift, noise, and input stage robustness.
FAQ
What is the maximum operating temperature range for the OPA4205APWT?
The OPA4205APWT is rated for continuous operation from –40°C to +125°C ambient temperature. This specification is validated across all electrical parameters in the datasheet, including offset voltage drift (±0.08 µV/°C max), open-loop gain (>126 dB), and quiescent current (≤310 µA per amplifier). The device maintains full functionality and guaranteed performance throughout this range, making it suitable for under-hood automotive sensors and industrial control cabinets.
Does the OPA4205APWT support single-supply operation?
Yes, the OPA4205APWT supports true single-supply operation from 4.5 V to 36 V. Its rail-to-rail output stage swings within 200 mV of both supply rails at 10 kΩ load, and its input common-mode range extends from (V–) + 1 V to (V+) – 1.4 V - enabling direct interfacing with 3.3 V or 5 V microcontrollers and ADCs without level-shifting circuitry. The OPA4205APWT maintains specified offset, noise, and bandwidth performance across the entire single-supply range.
What is the input bias current specification for the OPA4205APWT?
The OPA4205APWT has a maximum input bias current of ±500 pA over temperature (–40°C to +125°C), with a typical value of 100 pA at 25°C. This ultra-low bias current results from its super-beta bipolar input stage and enables high-impedance sensor interfacing - such as photodiodes, pH electrodes, and piezoelectric elements - without introducing significant DC error or Johnson noise from feedback resistors. The OPA4205APWT also specifies ±400 pA max input offset current under the same conditions.
How does the OPA4205APWT handle capacitive loads?
The OPA4205APWT is characterized to drive capacitive loads up to 30 pF stably in unity-gain configuration, as confirmed by phase margin measurements (≥58° at CL = 25 pF). For loads exceeding 30 pF, external isolation resistance (e.g., 10–50 Ω in series with the output) is recommended to maintain stability. The device's internal compensation avoids the need for external capacitors, simplifying layout in multi-channel TSSOP-14 designs where board space is constrained.
Is the OPA4205APWT pin-compatible with other devices in the OPAx205 family?
The OPA4205APWT shares identical pin functions with the OPA4205D (SOIC-14) variant, differing only in package type (TSSOP-14 vs SOIC-14). It is not pin-compatible with OPA205 (SOIC-8) or OPA2205 (SOIC-8/VSSOP-8) due to different channel count and pin count. All OPA4205 variants - including OPA4205APWT - use the same 14-pin mapping for +IN/–IN/OUT per channel and shared V+/V– supplies, ensuring consistent schematic symbol reuse across package options.
OPA4205APWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- e-trim™
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- Push-Pull, Rail-to-Rail
- Slew Rate:
- 4V/µs
- Gain Bandwidth Product:
- 3.6 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 100 pA
- Voltage - Input Offset:
- 4 µV
- Current - Supply:
- 220µA (x4 Channels)
- Current - Output / Channel:
- 25 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
OPA4205APWT FAQ
1.How can I place an order for OPA4205APWT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4205APWT 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 OPA4205APWT reliable?
The price and inventory of OPA4205APWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4205APWT is usually 5 days.
3.What payment methods are accepted for OPA4205APWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4205APWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4205APWT?
OPA4205APWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4205APWT 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 OPA4205APWT?
For technical support, including OPA4205APWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4205APWT requirements.
6.How does Aetrix verify that OPA4205APWT is sourced from the original manufacturer or authorized distributors?
All OPA4205APWT 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 OPA4205APWT meets industry standards.
7.What is the process for return or replacement of OPA4205APWT?
All OPA4205APWT units undergo pre-shipment inspection (PSI). If there is an issue with OPA4205APWT, 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 OPA4205APWT part is unused and in its original packaging.
Return procedure for OPA4205APWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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