My Inquiry
My Account
Texas Instruments OPA4705UA
- Part No.:
- OPA4705UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4705UA.pdf
- Description:
- IC CMOS 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,284
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
OPA4705UA from Texas Instruments is a quad, rail-to-rail input/output CMOS operational amplifier optimized for low-power, medium-speed signal conditioning in 4V–12V single-supply or ±2V–±6V dual-supply systems. It delivers 1MHz gain-bandwidth, 0.6V/µs slew rate, 0.5mV max input offset voltage, 160µA quiescent current per amplifier, and output swing within 40mV of rails under light load - enabling high dynamic range in portable instrumentation and sensor front-ends.
For engineers reviewing the OPA4705UA datasheet, OPA4705UA pinout, OPA4705UA application, or OPA4705UA equivalent, key selection considerations include its guaranteed rail-to-rail I/O performance across –40°C to +85°C, low 1pA input bias current for high-impedance transducer interfaces, unity-gain stability, and SO-14 packaging suitable for space-constrained industrial data acquisition modules.
Technical Context
The OPA4705UA employs a complementary differential input stage enabling rail-to-rail common-mode input range extending 300mV beyond supply rails, with a defined 500mV transition region where both N- and P-channel pairs conduct. Its class AB output stage supports rail-to-rail output swing down to 40mV from V+ or V– with 100kΩ loads while maintaining >80dB open-loop gain.
It features unity-gain stability, drives up to 1000pF capacitive loads, and exhibits limited-range CMRR of 96dB (specified over reduced common-mode range), PSRR of 100µV/V, and THD+N of 0.02% at 1kHz - characteristics validated for operation from –55°C to +125°C with absolute maximum supply voltage of 13.2V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 1MHz - enables stable amplification of signals up to ~100kHz at moderate closed-loop gains in sensor signal chains. |
| Slew Rate | 0.6V/µs - supports clean 10Vpp output steps with ≤20µs settling time to 0.01%, suitable for buffered DAC outputs. |
| Input Offset Voltage | ±0.5mV (max) - ensures <0.01% gain error in 5V full-scale precision amplifiers without trimming. |
| Quiescent Current | 160µA per amplifier - allows four independent channels to operate below 1mA total supply current on 5V rails. |
| Rail-to-Rail Output Swing | Within 40mV of V+ or V– (RL = 100kΩ) - preserves >99% of available voltage headroom in 3.3V or 5V systems. |
| Input Bias Current | 1pA (max) - minimizes voltage error across >10MΩ source impedances, critical for piezoelectric and pH sensor interfaces. |
| Common-Mode Rejection | 96dB (limited range) - rejects power-supply ripple and shared-noise coupling when inputs operate near rails. |
Pinout & Package
OPA4705UA is packaged in a 14-pin SOIC (SO-14) surface-mount package with standard 1.27mm pitch, 8.65mm × 3.91mm body size, and JEDEC MS-012AC compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Out A | Amplifier A output - directly drives downstream ADC input or filter stage with rail-to-rail swing. |
| 2 | –In A | Inverting input for Channel A - accepts feedback network or inverting configuration signals. |
| 3 | +In A | Non-inverting input for Channel A - connects to high-impedance sensor nodes or reference dividers. |
| 4 | V– | Negative supply rail - shared return path for all four amplifiers; requires local 1µF + 1000pF bypassing. |
| 5 | +In C | Non-inverting input for Channel C - electrically isolated from other channels; enables independent signal paths. |
| 6 | –In C | Inverting input for Channel C - supports differential sensing or active filtering without crosstalk. |
| 7 | Out C | Amplifier C output - provides third independent buffered output for multi-channel data acquisition. |
| 8 | Out D | Amplifier D output - fourth channel output; pin-compatible with industry-standard quad op amp layouts. |
| 9 | –In D | Inverting input for Channel D - supports gain-setting resistors or summing junctions. |
| 10 | +In D | Non-inverting input for Channel D - accommodates reference voltage injection or sensor biasing. |
| 11 | V+ | Positive supply rail - accepts 4V–12V single or ±2V–±6V dual supplies; must be decoupled per channel. |
| 12 | +In B | Non-inverting input for Channel B - enables simultaneous processing of four analog signals in compact layout. |
| 13 | –In B | Inverting input for Channel B - supports matched feedback networks across all four channels. |
| 14 | Out B | Amplifier B output - second independent output; shares V+ and V– rails but maintains >100dB channel separation. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full utilization of 3.3V/5V supply rails in battery-powered equipment without level-shifting circuitry. |
| 160µA per amplifier quiescent current | Supports always-on sensor monitoring with four channels drawing <650µA total at 5V, extending battery life. |
| 1pA max input bias current | Eliminates significant offset errors in high-Z applications like photodiode transimpedance or electrochemical sensors. |
| Unity-gain stable | Permits direct use as voltage follower or active filter without external compensation components. |
| Specified over –40°C to +85°C | Validated for automotive cabin electronics, industrial PLC I/O modules, and outdoor environmental monitors. |
Applications
| Automotive Sensor Signal Conditioning | Portable Data Acquisition Front-End |
|---|---|
Use Scenario: Amplifying low-level signals from temperature, pressure, and position sensors in vehicle ECUs under 5V supply constraints. IC Role / Device Role / Timing Role: Quad-channel rail-to-rail op amp providing simultaneous buffering, gain, and level-shifting for four independent sensor channels. Use Value: Maintains >99% signal fidelity across 0–100°C ambient range with <0.5mV offset drift, eliminating calibration overhead. |
Use Scenario: Signal conditioning for handheld multimeters, oscilloscope probes, and portable spectrum analyzers powered by Li-ion batteries. IC Role / Device Role / Timing Role: Four independent low-power amplifiers driving successive stages of anti-alias filtering, PGA, and ADC driver circuits. Use Value: Delivers 1MHz bandwidth and 0.6V/µs slew rate while consuming <1mA total, enabling >20-hour battery runtime. |
| Transducer Interface for Industrial IoT Nodes | Active Filter Bank in Test Equipment |
Use Scenario: Interfacing strain gauges, RTDs, and capacitive humidity sensors in wireless edge nodes with strict power budgets. IC Role / Device Role / Timing Role: Precision transimpedance and instrumentation amplifier front-end with ultra-low input bias current. Use Value: 1pA input bias prevents loading of high-impedance transducers, preserving resolution in 16-bit+ measurement systems. |
Use Scenario: Implementing multi-pole low-pass, high-pass, and band-pass filters in automated test equipment requiring channel isolation. IC Role / Device Role / Timing Role: Quad op amp configured as independent Sallen-Key or multiple-feedback filter sections. Use Value: Guaranteed unity-gain stability and 1MHz GBW enable accurate 100kHz filter cutoffs with minimal component count per channel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad rail-to-rail operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2474IDR | Higher quiescent current (600µA per amp), lower GBW (2.8MHz), no guaranteed rail-to-rail input beyond rails. | Better AC performance but unsuitable for ultra-low-power battery operation or input signals exceeding rails. | Select TLV2474IDR only when higher speed is required and supply current is not constrained. |
| LMV324DR | Rail-to-rail output only; input range limited to V– to V+–1.5V; higher offset (3mV max); 120µA IQ. | Lower cost but cannot handle input signals near supply rails - invalid for true rail-to-rail sensor interfaces. | Choose LMV324DR for non-critical general-purpose amplification where input common-mode range is restricted. |
Compared with TLV2474IDR and LMV324DR, the OPA4705UA uniquely combines guaranteed rail-to-rail input *and* output, sub-0.5mV offset, and 160µA per amplifier consumption - making it the only option among the three qualified for precision, low-power, wide-input-range sensor signal chains.
Availability
OPA4705UA is available at Aetrix Electronics and suitable for automotive sensor interfaces, portable data acquisition systems, and industrial IoT transducer front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA4705UA 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 op amps and signal chain solutions.
The OPA4705UA belongs to TI's OPA705 family of low-cost, rail-to-rail CMOS op amps designed specifically for cost-sensitive, low-power applications demanding wide supply range and high input impedance - including automotive, portable, and industrial sensing systems.
FAQ
What is the operating temperature range for the OPA4705UA?
The OPA4705UA is fully specified and guaranteed over –40°C to +85°C, with extended operating capability from –55°C to +125°C. Its electrical parameters-including input offset voltage, CMRR, and quiescent current-are characterized and tested across the –40°C to +85°C range, making it suitable for under-hood automotive and industrial control environments where thermal stability is critical. The OPA4705UA maintains rail-to-rail I/O functionality across this full specified range.
Does the OPA4705UA support true rail-to-rail input operation?
Yes, the OPA4705UA supports true rail-to-rail input operation: its common-mode input voltage range extends 300mV beyond both supply rails (V– – 0.3V to V+ + 0.3V) at room temperature. This is achieved via a complementary N- and P-channel input stage. While a 500mV transition region exists where both pairs conduct-causing minor variation in PSRR and CMRR-the device remains functional and linear across the full extended range, unlike amplifiers with limited input swing.
Can the OPA4705UA drive capacitive loads, and what is the maximum value?
The OPA4705UA can reliably drive up to 1000pF of pure capacitive load while maintaining stability. Its unity-gain configuration remains stable with such loads, though small-signal overshoot increases with capacitance-reaching ~30% at 1000pF. For loads >100pF, inserting a 10Ω–20Ω series resistor inside the feedback loop (between output and inverting input) suppresses ringing without affecting DC accuracy, as confirmed in TI's SBOS182A datasheet Figure 5.
What is the typical input bias current of the OPA4705UA, and why does it matter?
The OPA4705UA has a maximum input bias current of ±10pA and a typical value of 1pA at 25°C. This ultra-low bias current is essential for interfacing with high-output-impedance sources such as photodiodes, piezoelectric sensors, and pH electrodes-where even nanoampere-level currents would generate significant offset voltage errors. At 1pA, a 10MΩ source adds only 10µV of error, preserving measurement integrity in precision analog front-ends.
Is the OPA4705UA pin-compatible with other quad op amps in SO-14 packages?
The OPA4705UA uses a standard SO-14 pinout matching industry conventions for quad op amps (e.g., pins 1/7/8/14 = outputs, pins 2/3/5/6/9/10/12/13 = inputs, pins 4/11 = supplies). However, it is not functionally or electrically pin-compatible with legacy parts like LM324 or TLC274 due to differences in input stage architecture (CMOS vs bipolar), supply range, and rail-to-rail behavior. Layout reuse is possible, but circuit validation is required before substitution.
OPA4705UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- CMOS
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.6V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 160µA (x4 Channels)
- Current - Output / Channel:
- 10 mA
- Voltage - Supply Span (Min):
- 4 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
OPA4705UA FAQ
1.How can I place an order for OPA4705UA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4705UA 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 OPA4705UA reliable?
The price and inventory of OPA4705UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4705UA is usually 5 days.
3.What payment methods are accepted for OPA4705UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4705UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4705UA?
OPA4705UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4705UA 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 OPA4705UA?
For technical support, including OPA4705UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4705UA requirements.
6.How does Aetrix verify that OPA4705UA is sourced from the original manufacturer or authorized distributors?
All OPA4705UA 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 OPA4705UA meets industry standards.
7.What is the process for return or replacement of OPA4705UA?
All OPA4705UA units undergo pre-shipment inspection (PSI). If there is an issue with OPA4705UA, 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 OPA4705UA part is unused and in its original packaging.
Return procedure for OPA4705UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA4705UA Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
