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Texas Instruments OPA735AIDR
- Part No.:
- OPA735AIDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA735AIDR.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,205
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Product details
Overview
OPA735AIDR from Texas Instruments is a single, high-precision, zero-drift CMOS operational amplifier in SOIC-8 package, delivering 5µV max offset voltage, 0.05µV/°C max drift, and 750µA max quiescent current across ±1.35V to ±6V (2.7V–12V) supply range. It enables rail-to-rail output swing within 50mV of rails and supports transducer signal conditioning in battery-powered medical instrumentation.
For engineers reviewing the OPA735AIDR datasheet, OPA735AIDR pinout, OPA735AIDR application, or OPA735AIDR equivalent, key selection criteria include ultra-low offset stability over temperature, low input bias current (200pA max), wide supply flexibility, absence of shutdown functionality (distinguishing it from OPA734), and SOIC-8 compatibility for legacy PCB layouts.
Technical Context
The OPA735AIDR employs auto-zeroing architecture with a time-continuous 1.6MHz main amplifier corrected every 100µs, achieving near-zero long-term drift and eliminating 1/f noise. Its input stage uses CMOS technology to deliver 200pA max input bias current and 10pF common-mode input capacitance.
It operates without internal shutdown logic-unlike the pin-compatible OPA734-making it suitable for always-on precision gain stages. The device is unity-gain stable, exhibits no phase reversal, and maintains 115dB min open-loop gain and 130dB min CMRR across −40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | 5µV (max) - ensures ≤0.005mV error in 1V full-scale measurement systems |
| Offset Drift | 0.05µV/°C (max) - guarantees <0.5µV total drift over 10°C ambient change |
| Quiescent Current | 750µA (max) - enables operation from coin-cell sources in handheld test equipment |
| Input Bias Current | 200pA (max) - minimizes voltage error across >10MΩ sensor impedances |
| Supply Range | 2.7V to 12V (±1.35V to ±6V) - supports single-supply 3.3V/5V and dual-supply ±5V systems |
| Output Swing | Within 50mV of rails (RL = 10kΩ) - preserves dynamic range in low-voltage data acquisition |
| Gain-Bandwidth | 1.6MHz - sufficient for DC–10kHz sensor signal amplification with ≥60° phase margin |
Pinout & Package
OPA735AIDR is housed in an 8-pin SOIC (D) package per JEDEC MS-012, with 1.27mm pitch, 3.9mm width, and 1.75mm max height. Pin 1 is located at the index corner with beveled edge marking.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (−IN) | Differential input node; requires matched source impedance to minimize clock feedthrough |
| 2 | Non-Inverting Input (+IN) | Differential input node; thermally symmetric layout critical for sub-µV offset stability |
| 3 | Output (OUT) | Rail-to-rail capable output; drives ≥10kΩ load with <50mV headroom to each rail |
| 4 | Negative Supply (V−) | Reference for all internal circuitry; must be decoupled with 0.1µF ceramic capacitor |
| 5 | Positive Supply (V+) | Power rail; shares same decoupling requirement as V−; supports up to +12V absolute max |
| 6 | No Connect (NC) | Internally unconnected; must remain floating-no external tie or pull-up/down |
| 7 | No Connect (NC) | Internally unconnected; electrically isolated; no routing or thermal coupling required |
| 8 | Ground / Common Reference | Not used-OPA735 has no dedicated ground pin; V− serves as reference in single-supply mode |
Key Features
| Feature | Design Value |
|---|---|
| Zero-Drift Auto-Zero Architecture | Eliminates 1/f noise and achieves 0.05µV/°C max drift-critical for decade-long calibration stability |
| Rail-to-Rail Output | Swings within 50mV of V+ and V− rails at 10kΩ load-maximizes usable ADC input range in 3.3V systems |
| Ultra-Low Input Bias Current | 200pA max enables direct interfacing with high-impedance pH electrodes and piezoresistive bridges |
| Wide Supply Flexibility | Operates from 2.7V single supply to ±6V dual supply-reduces need for multiple LDOs in mixed-signal boards |
| Unity-Gain Stable, No Phase Reversal | Guarantees predictable closed-loop behavior in gain-of-1 buffers and active filters without compensation |
Applications
| Transducer Signal Conditioning | Medical Instrumentation |
|---|---|
|
Use Scenario: Amplifying µV-level outputs from load cells and strain gauges in electronic scales. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with gain-setting resistors and low-noise filtering. Use Value: 5µV max offset ensures ≤0.005% full-scale error in 100mV span bridge measurements at room temperature. |
Use Scenario: Front-end amplification of ECG, EEG, and pulse oximeter analog signals. IC Role / Device Role / Timing Role: DC-coupled, low-drift gain stage preceding anti-aliasing filter and ADC. Use Value: 0.05µV/°C drift prevents baseline wander during 37°C patient monitoring over extended sessions. |
| Battery-Powered Test Equipment | Temperature Measurement Systems |
|
Use Scenario: Portable multimeters and handheld DMMs requiring microamp-level supply current. IC Role / Device Role / Timing Role: Autoranging amplifier and reference buffer in precision voltage/current measurement paths. Use Value: 750µA max IQ extends AA/AAA battery life to >100 hours in continuous-use handheld calibrators. |
Use Scenario: Cold-junction compensation and linearization of thermocouple outputs (e.g., Type K). IC Role / Device Role / Timing Role: High-impedance, low-drift buffer for thermistor voltage dividers and RTD excitation circuits. Use Value: 200pA max IB introduces <1µV error across 10kΩ thermistor networks-enabling ±0.1°C accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA735AIDBVR | SOT-23-5 package (5-pin); identical electrical specs; no enable/shutdown pin; smaller footprint | Preferred for space-constrained portable devices where SOIC-8 layout is unavailable | Select when board area is limited and thermal resistance >200°C/W is acceptable |
| LTC2050CS8#PBF | 5µV max offset, 0.05µV/°C drift, but 1.1mA IQ; SOIC-8; higher PSRR (140dB) | Better rejection of supply noise in noisy industrial environments; slightly higher power draw | Choose when supply ripple exceeds 10mVpp and system PSRR budget is <120dB |
Compared with OPA735AIDR, the SOT-23-5 OPA735AIDBVR saves 70% board area but increases thermal resistance by 50°C/W; the LTC2050 offers superior PSRR at +0.35mA quiescent penalty-making OPA735AIDR optimal for cost-sensitive, thermally managed, low-noise precision systems.
Availability
OPA735AIDR is available at Aetrix Electronics and suitable for transducer signal conditioning, medical instrumentation, and battery-powered test equipment requiring stable component supply across industrial temperature ranges (−40°C to +85°C) and long-lifecycle production programs.
Supply support for OPA735AIDR 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 50 years of innovation in precision signal chain components.
The OPA735AIDR belongs to TI's Zerø-Drift Series of precision op amps, engineered specifically for DC-critical applications demanding sub-µV offset stability, ultra-low drift, and robust performance in single-supply, low-power environments.
FAQ
What is the maximum supply voltage for OPA735AIDR?
The absolute maximum supply voltage for OPA735AIDR is +13.2V. Operation beyond this rating risks permanent damage. The recommended operating range is +2.7V to +12V (or ±1.35V to ±6V for dual supplies). Electrical specifications are guaranteed only within the −40°C to +85°C temperature range and specified supply conditions. Exceeding 12V reduces long-term reliability even if below 13.2V absolute max.
Does OPA735AIDR include a shutdown feature?
No, OPA735AIDR does not include a shutdown feature. It is the non-shutdown variant of the OPA734/OPA735 family. The pinout lacks an enable input-pins 6 and 7 are NC, and there is no logic-controlled standby mode. For shutdown capability, use OPA734AIDR (SOIC-8) or OPA734AIDBVT (SOT-23-6), which provide 9µA max shutdown current and high-impedance output.
What is the input common-mode voltage range for OPA735AIDR?
The input common-mode voltage range for OPA735AIDR is (V−) − 0.1V to (V+) − 1.5V. For example, with V− = 0V and V+ = 5V, inputs must stay between −0.1V and +3.5V. Operation outside this range degrades CMRR and may cause unpredictable output behavior. This limitation tightens at lower supplies-e.g., on 3V single supply, the usable range is 0.1V below ground to 1.5V above ground.
Can OPA735AIDR drive capacitive loads?
OPA735AIDR is unity-gain stable but exhibits increasing overshoot with capacitive loads >100pF. Typical overshoot reaches ~15% at 1nF. For loads >500pF, external isolation (e.g., series resistor + feedback capacitor) is required. The device's 1.5V/µs slew rate and 1.6MHz GBW limit large-signal settling time-verify step response in SPICE using TI's TINA model before finalizing layout.
How does OPA735AIDR achieve zero-drift performance?
OPA735AIDR uses an auto-zero topology with a time-continuous 1.6MHz main amplifier corrected every 100µs via internal sampling and correction circuitry. Upon power-up, it requires one full auto-zero cycle (~100µs) plus bias start-up time to reach specified 5µV offset accuracy. During this period, output functions but offset is unspecified. Clock feedthrough is minimized by matching source impedances (<1kΩ) on both inputs.
OPA735AIDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Zero-Drift
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1.5V/µs
- Gain Bandwidth Product:
- 1.6 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 100 pA
- Voltage - Input Offset:
- 1 µV
- Current - Supply:
- 600µA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA735AIDR FAQ
1.How can I place an order for OPA735AIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA735AIDR 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 OPA735AIDR reliable?
The price and inventory of OPA735AIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA735AIDR is usually 5 days.
3.What payment methods are accepted for OPA735AIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA735AIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA735AIDR?
OPA735AIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA735AIDR 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 OPA735AIDR?
For technical support, including OPA735AIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA735AIDR requirements.
6.How does Aetrix verify that OPA735AIDR is sourced from the original manufacturer or authorized distributors?
All OPA735AIDR 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 OPA735AIDR meets industry standards.
7.What is the process for return or replacement of OPA735AIDR?
All OPA735AIDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA735AIDR, 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 OPA735AIDR part is unused and in its original packaging.
Return procedure for OPA735AIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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