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Texas Instruments OPA2735AIDG4
- Part No.:
- OPA2735AIDG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2735AIDG4.pdf
- Description:
- IC OPAMP ZERO-DRIFT 2 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,768
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Product details
Overview
OPA2735AIDG4 from Texas Instruments is a dual, zero-drift CMOS operational amplifier optimized for precision DC-coupled applications requiring ultra-low offset voltage (5 µV max), near-zero drift (0.05 µV/°C max), and low quiescent current (750 µA max per amplifier) across 2.7 V to 12 V single-supply operation. It delivers rail-to-rail output swing within 50 mV of the rails and supports high-impedance sensor signal conditioning in battery-powered instrumentation.
For engineers reviewing the OPA2735AIDG4 datasheet, OPA2735AIDG4 pinout, OPA2735AIDG4 application, or OPA2735AIDG4 equivalent, key selection criteria include guaranteed offset stability over temperature, input bias current ≤200 pA, shutdown capability (not present in this non-shutdown variant), and SOIC-8 package compatibility with legacy layouts requiring dual op-amp precision performance.
Technical Context
The OPA2735AIDG4 employs auto-zeroing architecture with a time-continuous 1.6 MHz main amplifier corrected every 100 µs, enabling simultaneous low offset and near-zero drift. Its CMOS input stage provides 200 pA max input bias current and 10 pF common-mode input capacitance, supporting high-impedance transducer interfaces without significant loading error.
Specified for −40°C to +85°C operation, it achieves 115 dB open-loop gain, 1.6 MHz gain-bandwidth product, and 1.5 V/µs slew rate while maintaining rail-to-rail output swing (20–50 mV from rails at 10 kΩ load). Input common-mode range extends from (V−) − 0.1 V to (V+) − 1.5 V, enabling direct interfacing with unbuffered ADC references and bridge sensors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | 5 µV maximum - ensures sub-LSB error in 16-bit+ systems with 10 V full-scale range |
| Drift vs Temperature | 0.05 µV/°C maximum - guarantees <0.5 µV total drift over 85°C operating range |
| Quiescent Current | 750 µA per amplifier maximum - enables >1-year battery life in handheld test equipment at 3 V supply |
| Input Bias Current | 200 pA maximum - preserves accuracy with >10 MΩ source impedances (e.g., thermistors, pH electrodes) |
| Supply Range | 2.7 V to 12 V single-supply - supports direct connection to Li-ion, 3.3 V, and 5 V rails without level shifting |
| Gain-Bandwidth Product | 1.6 MHz - sufficient for anti-alias filtering up to 100 kHz with unity-gain stable configuration |
| Output Swing | Within 50 mV of rails at 10 kΩ - maximizes dynamic range when driving SAR ADCs with 0–VREF inputs |
Pinout & Package
OPA2735AIDG4 is housed in an 8-pin SOIC (D) package with 1.27 mm lead pitch, 3.91 mm body width, and 1.75 mm max height, compliant with JEDEC MS-012AA and RoHS Green requirements.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives low-impedance loads up to ±20 mA; high-impedance state not supported (no shutdown) |
| 2 | −IN A | Inverting input A - accepts differential signals within (V−) − 0.1 V to (V+) − 1.5 V common-mode range |
| 3 | +IN A | Non-inverting input A - matched to −IN A for optimal CMRR; requires symmetrical source impedance to minimize clock feedthrough |
| 4 | V− | Negative supply rail - referenced for all input/output voltage ranges; must be connected even in single-supply use |
| 5 | +IN B | Non-inverting input B - electrically isolated from Channel A; shares same V− and V+ rails |
| 6 | −IN B | Inverting input B - independent of Channel A; supports dual-sensor conditioning without crosstalk |
| 7 | OUT B | Amplifier B output - identical performance to OUT A; enables dual-channel instrumentation amplifiers or active filters |
| 8 | V+ | Positive supply rail - supplies both amplifiers; requires 0.1 µF ceramic bypass capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift auto-zero architecture | Eliminates thermal EMF-induced errors in precision weigh scales by suppressing long-term offset drift below 0.05 µV/°C |
| Rail-to-rail output | Delivers full 0–VREF swing into 10 kΩ loads, preserving ADC effective resolution without external level-shifting circuitry |
| Ultra-low input bias current | Enables direct connection to high-impedance medical sensors (e.g., ECG electrodes, thermopiles) without signal attenuation |
| Single-supply operation | Operates from 2.7 V to 12 V, allowing direct integration into portable devices powered by coin cells or Li-ion batteries |
| Unity-gain stable | Supports direct use in buffer, integrator, and active filter configurations without external compensation components |
Applications
| Transducer Signal Conditioning | Medical Instrumentation |
|---|---|
|
Use Scenario: Amplifying microvolt-level outputs from load cells, strain gauges, or pressure bridges in electronic scales. IC Role / Device Role / Timing Role: Dual-channel precision instrumentation amplifier front-end with matched gain paths and low noise density (135 nV/√Hz). Use Value: 5 µV max offset ensures ≤0.005% full-scale error in 100 mV span transducers; rail-to-rail output drives 16-bit ADCs directly. |
Use Scenario: Biopotential signal acquisition in portable ECG or EEG monitors with dry electrodes. IC Role / Device Role / Timing Role: Low-noise, high-input-impedance preamplifier stage rejecting common-mode interference from AC mains. Use Value: 200 pA max input bias current prevents electrode polarization; 115 dB CMRR suppresses 50/60 Hz noise without guard traces. |
| Battery-Powered Test Equipment | Temperature Measurement Systems |
|
Use Scenario: Precision voltage reference buffering and sensor excitation in handheld multimeters or calibrators. IC Role / Device Role / Timing Role: Dual op-amp providing reference voltage follower and ratiometric sensor excitation simultaneously. Use Value: 750 µA max quiescent current per channel extends battery life to >500 hours on two AA cells; 0.05 µV/°C drift maintains calibration stability. |
Use Scenario: Cold-junction compensation and linearization of thermocouple outputs in industrial temperature controllers. IC Role / Device Role / Timing Role: High-accuracy difference amplifier rejecting thermoelectric voltages induced by PCB thermal gradients. Use Value: Auto-zero correction eliminates Seebeck-effect errors; 10 pF input capacitance minimizes phase shift in thermistor RC networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2188AIDR | Higher offset (25 µV max), lower drift (0.003 µV/°C), no auto-zero clock feedthrough | Preferred for ultra-low-noise audio or spectral analysis where 1.6 MHz auto-zero clock must be avoided | Select OPA2188AIDR when clock feedthrough sensitivity outweighs need for sub-5 µV initial offset |
| AD8629ARZ | Similar offset (5 µV max) and drift (0.02 µV/°C), but higher quiescent current (1.2 mA per amp) | Suitable for industrial PLC analog I/O modules where power budget allows >1 mA per channel | Choose AD8629ARZ if SOIC-8 footprint compatibility is required and higher supply current is acceptable |
Compared with OPA2735AIDG4, OPA2188AIDR trades initial offset precision for zero clock feedthrough and superior low-frequency noise, while AD8629ARZ matches offset performance but consumes 60% more supply current-making OPA2735AIDG4 optimal for battery-constrained, high-DC-accuracy applications.
Availability
OPA2735AIDG4 is available at Aetrix Electronics and suitable for electronic scales, medical instrumentation, and battery-powered test equipment requiring stable component supply across extended production lifecycles.
Supply support for OPA2735AIDG4 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 specializing in analog and embedded processing technologies, with leadership in precision signal chain solutions.
The OPA2735AIDG4 belongs to TI's Zerø-Drift Series of CMOS op amps, designed specifically for high-accuracy DC-coupled measurement systems where long-term offset stability and low power consumption are critical.
FAQ
What is the maximum allowable supply voltage for OPA2735AIDG4?
The absolute maximum supply voltage for OPA2735AIDG4 is +13.2 V. Operation above this rating may cause permanent damage. The device is specified for normal operation from +2.7 V to +12 V (or ±1.35 V to ±6 V in split-supply configurations). Exceeding 12 V during continuous operation violates the recommended operating conditions and risks reliability degradation, even if below the absolute maximum limit. Always maintain VS ≤ 12 V in final designs using OPA2735AIDG4.
Does OPA2735AIDG4 include a shutdown feature?
No, OPA2735AIDG4 does not include a shutdown feature. It is the non-shutdown version of the dual OPA2735 family. Shutdown functionality is only available in the OPA2734 variant (e.g., OPA2734AIDGST), which adds dedicated enable pins. OPA2735AIDG4 operates continuously when powered and draws 750 µA per amplifier regardless of signal activity. This makes it suitable for always-on precision monitoring but not for ultra-low-power duty-cycled systems requiring standby current <10 µA.
What is the input common-mode voltage range for OPA2735AIDG4?
The input common-mode voltage range for OPA2735AIDG4 is (V−) − 0.1 V to (V+) − 1.5 V. For example, with a single 5 V supply (V− = 0 V, V+ = 5 V), valid input voltages span 0.1 V below ground to 3.5 V. Inputs exceeding this range may degrade CMRR or cause phase reversal. The specification assumes proper decoupling and layout; exceeding the upper bound by >0.5 V requires series current limiting (≤10 mA) per the datasheet's input protection guidance. This range directly impacts bridge sensor biasing and ADC reference interface design in OPA2735AIDG4 circuits.
How does the auto-zero architecture affect OPA2735AIDG4's noise performance?
OPA2735AIDG4's auto-zero architecture results in 0.8 µVPP integrated input voltage noise (0.01 Hz to 1 Hz) and 2.5 µVPP (0.1 Hz to 10 Hz), with a noise density of 135 nV/√Hz at 1 kHz. Unlike chopper-stabilized amplifiers, it avoids large 1/f noise discontinuities but introduces 1.6 MHz clock feedthrough that appears as small spurs in the output spectrum. Feedthrough is minimized by matching source impedances (<1 kΩ) on both inputs and using low-ESR bypass capacitors. This behavior is inherent to the auto-zero topology and confirmed in the OPA2735AIDG4's typical characteristics plots.
Is OPA2735AIDG4 pin-compatible with other dual op-amps in SOIC-8 packages?
OPA2735AIDG4 follows the industry-standard dual op-amp SOIC-8 pinout (pin 1 = OUT A, pin 2 = −IN A, pin 3 = +IN A, pin 4 = V−, pin 5 = +IN B, pin 6 = −IN B, pin 7 = OUT B, pin 8 = V+), matching LM358, TL072, and OPA234. However, functional compatibility requires verification of input/output voltage ranges, supply current, and stability characteristics. While footprint-compatible, substituting OPA2735AIDG4 for non-zero-drift op-amps may require layout adjustments to mitigate EMI sensitivity due to its high DC precision and auto-zero clock.
OPA2735AIDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Zero-Drift
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- Zero-Drift
- Number of Circuits:
- 2
- Output Type:
- Differential, 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 (x2 Channels)
- 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
OPA2735AIDG4 FAQ
1.How can I place an order for OPA2735AIDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2735AIDG4 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 OPA2735AIDG4 reliable?
The price and inventory of OPA2735AIDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2735AIDG4 is usually 5 days.
3.What payment methods are accepted for OPA2735AIDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2735AIDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2735AIDG4?
OPA2735AIDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2735AIDG4 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 OPA2735AIDG4?
For technical support, including OPA2735AIDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2735AIDG4 requirements.
6.How does Aetrix verify that OPA2735AIDG4 is sourced from the original manufacturer or authorized distributors?
All OPA2735AIDG4 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 OPA2735AIDG4 meets industry standards.
7.What is the process for return or replacement of OPA2735AIDG4?
All OPA2735AIDG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2735AIDG4, 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 OPA2735AIDG4 part is unused and in its original packaging.
Return procedure for OPA2735AIDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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