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Texas Instruments OPA705PA
- Part No.:
- OPA705PA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA705PA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:925
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Product details
Overview
OPA705PA from Texas Instruments is a single-channel, 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, 160µA quiescent current per amplifier, and output swing within 40mV of rails under light load - enabling high dynamic range in battery-powered sensor front-ends and portable data acquisition.
For engineers reviewing the OPA705PA datasheet, OPA705PA pinout, OPA705PA application, or OPA705PA equivalent, key selection criteria include its rail-to-rail I/O capability at ultra-low IQ, guaranteed operation from –40°C to +85°C, DIP-8 through-hole package compatibility, and verified performance in transducer amplification, active filtering, and DAC reference buffering without phase inversion on over-rail inputs.
Technical Context
The OPA705PA uses a complementary N/P-channel input stage enabling rail-to-rail common-mode input range extending 300mV beyond supply rails, with a defined 500mV transition region where both pairs conduct. Its class AB output stage supports rail-to-rail output swing down to 40mV from V+ or V− with 100kΩ load while maintaining >80dB open-loop gain.
It is unity-gain stable and specified across full supply (±2V to ±6V) and temperature (–40°C to +85°C) ranges. Input bias current remains at 1pA typical, and PSRR/CMRR are characterized both in full-scale and limited-range modes - with 96dB limited-range CMRR explicitly confirmed for the OPA705 family including OPA705PA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 1 MHz - supports stable unity-gain buffer and low-gain signal conditioning up to ~100kHz with minimal phase lag. |
| Slew Rate | 0.6 V/µs - enables clean 10Vpp output at 10kHz in unity-gain configuration without slewing distortion. |
| Input Offset Voltage | ±0.5 mV (max) - ensures ≤5mV total error in 10-bit ADC front-end with 3.3V reference without trimming. |
| Quiescent Current | 160 µA (typ), 250 µA (max) - allows continuous operation for >1 year on a single CR2032 coin cell in always-on sensor nodes. |
| Rail-to-Rail Output Swing | Within 40 mV of V+ or V− (RL = 100kΩ) - preserves >97% of available voltage headroom in 5V single-supply systems. |
| Input Bias Current | 1 pA (typ) - minimizes voltage error across high-impedance sources (e.g., pH electrodes, piezoelectric sensors). |
| Common-Mode Rejection | 96 dB (limited range) - suppresses power-supply noise coupling in unregulated battery-fed designs. |
Pinout & Package
DIP-8 through-hole package (Package Drawing P, JEDEC MS-001), 0.3" wide body, 0.1" lead pitch, RoHS-compliant NiPdAu finish, MSL N/A (non-moisture-sensitive). Pin 1 identifier notch located at top-left corner when viewed from top with pins down.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (–In) | High-impedance differential node; accepts signals from V– –0.3V to V+ +0.3V with ESD diode clamping. |
| 2 | Non-Inverting Input (+In) | Complementary input pair enables rail-to-rail common-mode range; no phase inversion beyond rails if current-limited. |
| 3 | Output (Out) | Class AB stage drives ≥10mA; swings to within 40mV of rails with 100kΩ load; stable with ≤1000pF capacitive load. |
| 4 | V– (Negative Supply) | Ground reference in single-supply mode; must be bypassed with 1000pF ceramic + 1µF tantalum for stability. |
| 5 | V+ (Positive Supply) | Accepts 4V–12V single or ±2V–±6V dual; quiescent current varies <10% across full range (160–170µA typ). |
| 6–8 | No Connect (NC) | Internally unused; must remain unconnected per TI design guidance to avoid parasitic coupling or latch-up risk. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal utilization in low-voltage (e.g., 5V or 3.3V) systems without level-shifting circuitry. |
| 160µA quiescent current per amplifier | Supports always-on operation in energy-harvesting or battery-backed instrumentation with sub-µA sleep-state leakage. |
| 1pA input bias current | Preserves signal integrity from megaohm-level sources (e.g., photodiode, thermopile, MEMS microphone bias networks). |
| No phase inversion on over-rail inputs | Eliminates output glitches during power-up sequencing or transient overvoltage events when input current is ≤10mA. |
| Unity-gain stable | Permits direct use as voltage follower in precision reference buffers (e.g., for DAC7644) without external compensation. |
Applications
| Transducer Amplifier | Portable Data Acquisition |
|---|---|
Use Scenario: Amplifying low-level mV-range outputs from strain gauges, thermocouples, or piezoresistive pressure sensors in handheld test meters. IC Role / Device Role / Timing Role: Single-supply, rail-to-rail op amp configured as non-inverting amplifier with gain ≥10, rejecting common-mode noise from long sensor leads. Use Value: 0.5mV offset and 1pA bias current minimize zero-point drift and source loading, enabling <0.1% measurement accuracy without calibration. | Use Scenario: Signal conditioning front-end for 12-bit SAR ADCs in battery-powered environmental monitors logging temperature, humidity, and CO₂. IC Role / Device Role / Timing Role: Anti-aliasing filter driver and sensor buffer operating from 3.7V Li-ion cell with shutdown control via V+ enable. Use Value: 160µA IQ extends runtime >6 months between charges; rail-to-rail I/O captures full ADC input range without supply scaling. |
| Active Filter for Audio | DAC Reference Buffer |
Use Scenario: 2nd-order Sallen-Key low-pass filter in automotive cabin audio preamps targeting 20kHz cutoff with minimal THD+N. IC Role / Device Role / Timing Role: Dual-stage filter section using OPA705PA in unity-gain configuration to isolate filter poles and prevent loading effects. Use Value: 0.02% THD+N at 1kHz and 0.6V/µs slew rate ensure clean audio reproduction without slew-induced distortion. | Use Scenario: Buffered voltage reference for TI DAC7644 quad 16-bit DAC in automatic test equipment requiring matched positive/negative references. IC Role / Device Role / Timing Role: Precision unity-gain buffer isolating DAC internal reference from load variations and PCB trace capacitance. Use Value: Rail-to-rail output swing maintains exact ±2.5V reference levels; 1MHz GBW ensures fast settling (<20µs to 0.01%) after code changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA344PA | Lower 800kHz GBW, higher 220µA IQ, same DIP-8 package and rail-to-rail I/O. | Better DC precision (100µV VOS) but reduced bandwidth limits use in >50kHz active filters. | Select OPA344PA only when ultra-low offset dominates over speed; OPA705PA preferred for mixed-signal timing-critical paths. |
| MCP6001-P | Same 1MHz GBW and 160µA IQ, but only rail-to-rail output (not input); SO-8/DIP-8 available. | Lacks rail-to-rail input - cannot handle signals near V– in single-supply sensor interfaces without level shift. | Choose MCP6001-P for cost-sensitive, output-only rail-to-rail needs; OPA705PA required when input extends to ground or below. |
Compared with OPA344PA and MCP6001-P, the OPA705PA uniquely balances rail-to-rail input/output, 1MHz bandwidth, and 160µA IQ in a through-hole DIP-8 package - making it the only option among the three that supports true single-supply transducer interfacing without external biasing or gain adjustment.
Availability
OPA705PA is available at Aetrix Electronics and suitable for portable instrumentation, automotive sensor modules, and industrial data loggers requiring stable component supply with long-term DIP-8 through-hole availability and extended temperature support.
Supply support for OPA705PA 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The OPA705PA belongs to TI's precision CMOS op amp portfolio designed specifically for low-power, rail-to-rail signal conditioning in space-constrained and battery-operated systems - emphasizing quiescent current efficiency without sacrificing AC performance or DC accuracy.
FAQ
What is the maximum supply voltage rating for the OPA705PA?
The OPA705PA has an absolute maximum supply voltage rating of 13.2V across V+ and V– terminals. Its recommended operating range is 4V to 12V single supply or ±2V to ±6V dual supply. Operation outside these ranges may cause permanent damage or parametric degradation, as confirmed in the SBOS182A datasheet Absolute Maximum Ratings table.
Does the OPA705PA support rail-to-rail input in single-supply configurations?
Yes, the OPA705PA supports rail-to-rail input in single-supply configurations: its common-mode input range extends 300mV beyond both V– and V+, enabling valid operation from ground (V–) to V+ +0.3V. This is achieved via complementary N/P-channel input stages, and the feature is explicitly validated for the OPA705PA in the Applications Information section of SBOS182A.
Can the OPA705PA drive capacitive loads, and what is the maximum supported value?
The OPA705PA can drive up to 1000pF of pure capacitive load while maintaining stability, as documented in the Typical Characteristics section of SBOS182A. For unity-gain configurations with >100pF loads, TI recommends adding a 10Ω–20Ω series resistor inside the feedback loop to reduce ringing - a technique verified in Figure 5 of the datasheet.
Is the OPA705PA pin-compatible with other op amps in the OPA705 family?
No - the OPA705PA (DIP-8) is not pin-compatible with OPA705NA (SOT23-5) or OPA705UA (SO-8), as each variant uses different pinouts and terminal assignments. The DIP-8 version has NC pins at positions 6–8, whereas SO-8 and SOT23-5 allocate all pins functionally. Pin compatibility is only maintained within the same package type across gain variants, not across the family.
What is the guaranteed operating temperature range for the OPA705PA?
The OPA705PA is fully specified and guaranteed over the industrial temperature range of –40°C to +85°C, as stated in the Description and Electrical Characteristics sections of SBOS182A. While its absolute maximum ratings extend to –55°C to +125°C, electrical parameters such as offset voltage, CMRR, and quiescent current are only tested and warranted across the –40°C to +85°C range.
OPA705PA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- 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
- Current - Output / Channel:
- 10 mA
- Voltage - Supply Span (Min):
- 4 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA705PA FAQ
1.How can I place an order for OPA705PA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA705PA 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 OPA705PA reliable?
The price and inventory of OPA705PA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA705PA is usually 5 days.
3.What payment methods are accepted for OPA705PA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA705PA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA705PA?
OPA705PA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA705PA 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 OPA705PA?
For technical support, including OPA705PA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA705PA requirements.
6.How does Aetrix verify that OPA705PA is sourced from the original manufacturer or authorized distributors?
All OPA705PA 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 OPA705PA meets industry standards.
7.What is the process for return or replacement of OPA705PA?
All OPA705PA units undergo pre-shipment inspection (PSI). If there is an issue with OPA705PA, 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 OPA705PA part is unused and in its original packaging.
Return procedure for OPA705PA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA705PA Tags
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