OPA735AIDR - Zero-Drift 1.6MHz CMOS Op Amp, 5uV | TI
N.º da peça: OPA735AIDR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $2.45 | $2,45 |
| 10 | $2.18 | $21,80 |
| 100 | $1.92 | $192,00 |
| 500 | $1.68 | $840,00 |
| 1.000 | $1.45 | $1.450,00 |
| 2.500 | $1.28 | $3.200,00 |
OPA735AIDR Visão geral
A zero-drift operational amplifier is a precision analog amplifier that uses internal calibration (chopping or auto-zeroing) to continuously correct its input offset voltage, eliminating the 1/f noise and temperature drift that limit conventional CMOS op amps. Within the signal-chain hierarchy, zero-drift op amps belong to the precision-amplifier (or instrumentation-amplifier) category, which sits under the broader amplifier IC family and ultimately under analog signal conditioning. The OPA735's 5 uV max VOS and 0.05 uV/degC drift place it in the sub-10 uV precision tier favored for transducer front-ends.
Key differentiating specifications include 5 uV maximum input offset voltage, 0.05 uV/degC maximum offset drift, 1.6 MHz GBW, 115 dB CMRR, 1.6 mA typical quiescent current, and 50 mV rail-to-rail output headroom. The device supports both single and bipolar supplies (e.g., +5 V, +/-2.5 V, +/-5 V) and provides high-impedance CMOS inputs that draw only a few picoamperes of bias current - critical for high-impedance sensor bridges.
Architecturally, the OPA735 uses a switched-capacitor auto-zero topology that periodically samples and cancels the input offset and 1/f noise, achieving drift performance comparable to much larger chopper-stabilized modules while drawing only milliamps of quiescent current. This makes it ideal for battery-powered precision instrumentation where both accuracy and power budget matter.
Typical applications include precision weigh scales, strain-gauge bridges, thermocouple conditioning, medical instrumentation front-ends, handheld multimeter ADC drivers, and precision current-sense amplifiers. Designers also deploy the OPA735 in active filters, integrators, and reference buffers for 16- to 24-bit ADCs.
When laying out the PCB, place the 0.1 uF power-supply bypass capacitor within 2 mm of the supply pin and keep input traces short and guarded to preserve the 115 dB CMRR at high frequencies. The SOIC-8 thermal performance is adequate for the device's low dissipation; no heatsink is required.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives (including the OPA734 companion and cross-brand equivalents), and practical layout notes not found in the standalone datasheet.
Alternativas drop-in para OPA735AIDR — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com OPA735AIDR (mesmo formato e footprint) — diferindo em Package, Number of Channels, Amplifier Type, Gain-Bandwidth Product, Input Offset Voltage (max).
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
OPA735AID
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
OPA735AIDRG4
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
OPA734AIDR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
OPA2277UA
✅ Drop-In✓ Em estoque
$2.95 / unidade
Ver ficha técnica →MCP6072T-E/SN
✅ Drop-In✓ Em estoque
$0.72 / unidade
Ver ficha técnica →MAX9100EUK+T
✅ Drop-In✓ Em estoque
$1.95 / unidade
Ver ficha técnica →OPA735AIDR Classificações máximas e características elétricas
| Number of Channels | 1 |
| Amplifier Type | Zero-Drift / Auto-Zero CMOS Operational Amplifier |
| Input Offset Voltage (max) | 5 uV |
| Offset Drift (max) | 0.05 uV/degC |
| Gain-Bandwidth Product | 1.6 MHz |
| CMRR | 115 dB |
| Quiescent Current (typ) | 1.6 mA |
| Supply Voltage Range (single) | 2.7 V to 12 V |
| Supply Voltage Range (bipolar) | +/-1.35 V to +/-6 V |
| Output Swing | Rail-to-Rail (within 50 mV of rails) |
| Temperatura de operação | -40 C to +85 C |
| Encapsulamento | SOIC-8 (D) 3.90 mm |
| Tipo de montagem | Surface Mount |
| Nível MSL | 2 (1 year) |
| Status RoHS | Compliant |
| Input Type | CMOS, high-impedance |
Configuração de pinos do OPA735AIDR
| Pino 1 | NC — Not connected (per datasheet) |
| Pino 2 | IN- — Inverting input |
| Pino 3 | IN+ — Non-inverting input |
| Pino 4 | V- — Negative supply |
| Pino 5 | NC — Not connected (per datasheet) |
| Pino 6 | OUT — Output |
| Pino 7 | V+ — Positive supply |
| Pino 8 | NC — Not connected (per datasheet) |
Aplicações típicas
OPA735AIDR é adequado para 7 aplicaçãos: Precision Weigh Scale Signal Conditioning, Thermocouple Cold-Junction Compensation, Handheld Multimeter ADC Driver, Medical Instrumentation Front-End, Precision Current-Sense Amplifier, Active Filter and Integrator Stage, Photodiode Transimpedance Amplifier.
Precision Weigh Scale Signal Conditioning
The OPA735AIDR is ideal for strain-gauge bridge amplification in weigh-scale front-ends. Its 5 uV max input offset and 0.05 uV/degC drift directly minimize scale zero-point error and creep over temperature, while the 115 dB CMRR rejects common-mode noise from the bridge excitation. The high-impedance CMOS inputs accept low-output-impedance bridges without loading distortion. A typical circuit places the OPA735 as the first-stage instrumentation amp (INA129) gain-of-100 block, feeding a 24-bit ADC. Compared to chopper op amps in this role, the OPA735's 1.6 MHz GBW handles fast settling for multi-conversion-per-second update rates common in shipping scales.
Recomendado
Thermocouple Cold-Junction Compensation
The OPA735AIDR serves as a precision buffer for thermocouple cold-junction compensation in industrial temperature monitoring. The 5 uV offset translates to <0.1 C equivalent error for Type K thermocouples, and the 0.05 uV/degC drift stays below the measurement resolution of typical 16-bit ADCs across the industrial -40 C to +85 C ambient range. The rail-to-rail output swing supports single 5 V supply designs, eliminating the negative rail typically required for thermocouple conditioning. Combined with a precision reference (REF3030) and an op-amp thermocouple amplifier (OPA2188), the OPA735 enables total error budgets under 0.5 C.
Recomendado
Handheld Multimeter ADC Driver
The OPA735AIDR drives the input of 16- to 20-bit ADCs in handheld digital multimeters. Its 1.6 MHz GBW settles quickly enough for the 4 kHz conversion rate typical of RMS multimeters, while the 5 uV max offset contributes less than 1 count at 20-bit resolution on a 5 V reference. The single-supply 2.7 V to 12 V operation supports both 3.3 V logic-level ADCs and 5 V bipolar-input ADCs without level translation. Compared to OPA2277 in this role, the OPA735's auto-zero drift cancellation eliminates the periodic recalibration that conventional precision op amps require for 0.01% accuracy DMMs.
Recomendado
Medical Instrumentation Front-End
The OPA735AIDR is well-suited to the front-end of medical instrumentation including ECG, EEG, and pulse-oximeter signal chains. The 5 uV offset and 0.05 uV/degC drift maintain baseline stability over long patient-monitoring sessions, while the high input impedance (CMOS, pA-level bias) prevents loading of skin-electrode biopotential sources. The rail-to-rail output swing on a single 5 V supply enables direct connection to 24-bit medical-grade ADCs. The device's low 1.6 mA quiescent current is critical for battery-powered ambulatory monitors. FDA-cleared designs reference the OPA735 family in the documented schematics.
Recomendado
Precision Current-Sense Amplifier
The OPA735AIDR implements high-side or low-side current-sense amplifiers in battery-management and power-monitoring applications. Its 5 uV offset translates to sub-mA current-measurement accuracy when used with a 10 mOhm shunt, and the rail-to-rail output swing supports both low-voltage (3.3 V) and high-voltage (12 V) supply rails. The 1.6 MHz GBW handles the dynamic response of switching-mode power supplies, while the 115 dB CMRR rejects switching noise injected onto the common-mode voltage. Combined with a precision reference (REF3012) and 16-bit ADC (ADS1115), the OPA735 enables coulomb-counting accuracy within 1% across the discharge curve.
Recomendado
Active Filter and Integrator Stage
The OPA735AIDR functions as a precision active filter or integrator in 50 Hz/60 Hz line-noise rejection stages, sensor-signal conditioners, and analog computing modules. The 1.6 MHz GBW supports second-order low-pass filters with cutoffs up to 50 kHz, while the 5 uV offset and 0.05 uV/degC drift preserve DC accuracy in integrator reset circuits. The SOIC-8 single-channel package allows dense PCB layouts for multi-pole filters. Compared to TL082-class op amps, the OPA735's drift performance reduces long-time-constant integrator error to negligible levels in 10-second time-base integrators.
Recomendado
Photodiode Transimpedance Amplifier
The OPA735AIDR operates as a transimpedance amplifier (TIA) for photodiode current measurement in optical sensors, smoke detectors, and ambient-light systems. The high-impedance CMOS inputs handle pA-level photodiode currents directly without introducing bias-current error, while the 5 uV offset and low drift enable accurate measurements down to nA-scale photocurrents. The 1.6 MHz GBW supports gain-bandwidth products adequate for 100 kHz pulse response in optical-communication receivers. Combined with a low-leakage photodiode (BPW34) and 16-bit ADC, the OPA735 enables precision light-measurement systems.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para OPA735AIDR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | OPA735AID | OPA735AIDRG4 | OPA734AIDR | OPA2277UA | MCP6072T-E/SN |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Microchip Technology |
| Package | SOIC-8 (D) | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (SN) - same footprint |
| Gain-Bandwidth Product | 1.6 MHz | 1.6 MHz | 1.6 MHz | 0.7 MHz (-56%) | 1 MHz (-38%) | 1.2 MHz (-25%) |
| Input Offset Voltage (max) | 5 uV | 5 uV | 5 uV | 5 uV | 10 uV (+100%) | 150 uV (+2900%) |
| Offset Drift (max) | 0.05 uV/degC | 0.05 uV/degC | 0.05 uV/degC | 0.05 uV/degC | 0.1 uV/degC (+100%) | 1.5 uV/degC (+2900%) |
| Quiescent Current (typ) | 1.6 mA | 1.6 mA | 1.6 mA | 0.6 mA (-62%) | 1.4 mA (-12%) | 1.1 mA (-31%) |
| CMRR | 115 dB | 115 dB | 115 dB | 115 dB | 130 dB (+15 dB) | 90 dB (-25 dB) |
| Supply Voltage Range | 2.7 V to 12 V | 2.7 V to 12 V | 2.7 V to 12 V | 2.7 V to 12 V | +/-2 V to +/-18 V | 1.8 V to 5.5 V |
| Rail-to-Rail Output | Yes (within 50 mV) | Yes | Yes | Yes | No (swing to +/-13 V) | Yes (RRIO) |
Principais diferenciais
- Sub-10 uV zero-drift precision in SOIC-8 (vs OPA2277UA)
- Higher GBW for wider signal bandwidth (vs OPA734AIDR)
- Best-in-class CMRR for sensor bridge applications (vs MCP6072T-E/SN)
Notas de projeto
Place a 0.1 uF ceramic bypass capacitor within 2 mm of the V+ pin and a 1 uF to 10 uF bulk capacitor at the supply entry point. The SOIC-8 package pin layout places V- at pin 4 - do not route the negative-rail input trace under the package to avoid coupling noise into the high-impedance CMOS inputs. Use a ground plane on the layer beneath the op amp to maintain the 115 dB CMRR at high frequencies.
The OPA735 does not have rail-to-rail inputs - the common-mode voltage range extends only to within 1.5 V of V-. Exceeding this range distorts the input stage and can introduce permanent damage. For input signals approaching V-, use the OPA2277UA or MCP6072T-E/SN instead. Auto-zero amplifiers also generate small clock-feedthrough spurs at the switching frequency; avoid using the OPA735 in audio-frequency signal paths where these spurs are audible.
At unity gain, the 1.6 MHz GBW supports signal bandwidth up to ~160 kHz with 12 dB of headroom. For higher-frequency signals or sharper anti-alias filters, use a faster op amp such as the OPA354 (250 MHz). When driving capacitive loads above 100 pF, add a 50 ohm series resistor at the output to maintain phase margin; the OPA735 is stable for capacitive loads up to 1 nF without compensation.
Informações de conformidade
RoHS and REACH compliant per TI product page. Not AEC-Q100 qualified; for automotive applications verify with TI. Halogen-free status not explicitly stated in the available data.
