OP295GSZ-REEL - Dual 85kHz Rail-to-Rail Op Amp | Analog Devices
N.º da peça: OP295GSZ-REEL ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $5.41 | $5,41 |
| 10 | $4.85 | $48,50 |
| 100 | $4.3 | $430,00 |
| 500 | $3.86 | $1.930,00 |
| 1.000 | $3.42 | $3.420,00 |
| 2.500 | $3.1 | $7.750,00 |
OP295GSZ-REEL Visão geral
A rail-to-rail op amp (operational amplifier) is an analog amplifier whose output voltage swing reaches both the positive and the negative supply rails. Unlike a conventional op amp whose output can only approach within ~1-2 V of either rail, the rail-to-rail topology enables full dynamic range use of low-voltage supplies. Rail-to-rail amps sit in the broader hierarchy of op amps -> amplifiers -> analog ICs -> signal conditioning -> mixed-signal semiconductors, and they are essential building blocks whenever the signal swing must span the full supply range of a 5 V or 3.3 V system.
Key features of the OP295 include true bipolar front-end stages combined with CMOS output stages (the CBCMOS architecture), which yield lower voltage noise (15 nV/sqrt(Hz) typical) and higher DC accuracy than pure-CMOS rail-to-rail parts. The OP295 output swings to within 5 mV of either rail at 10 kohm load and within 10 mV at 2 kohm load, while the input common-mode range includes both rails, providing true zero-in/zero-out capability for single-supply 3.3 V and 5 V systems.
The CBCMOS architecture combines a bipolar input differential pair with CMOS output drivers, preserving the low offset drift (5 uV/C max) and low bias current (20 nA max) of precision bipolar amplifiers while delivering the rail-to-rail output swing that pure bipolar parts cannot. This makes the OP295 well suited for instrumentation buffers, sensor signal chains, and audio pre-amplifiers operating from a single low-voltage rail.
Typical applications include portable instrumentation, precision signal conditioning for sensors, low-voltage single-supply data acquisition front-ends, audio pre-amplifier stages, and battery-powered transducer amplifiers. The wide supply range (3 V to 36 V single-supply) also allows the part to operate directly from industrial 24 V buses with no additional regulation.
When designing with the OP295, remember that the input common-mode range extends to both rails, but the input stage uses bipolar transistors, so input bias current (~20 nA max) flows even when the inputs are near either rail. A 10 kohm feedback resistor network is a practical starting point; lower impedances waste quiescent current, higher impedances invite leakage and pickup.
Alternativas drop-in para OP295GSZ-REEL — 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 OP295GSZ-REEL (mesmo formato e footprint) — diferindo em Amplifier Type, Input Offset Voltage Drift, Operating Temperature Range, Package, Slew Rate.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
OP295GSZ
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
OP295GS-REEL7
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
OP295GS
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
OP295GPZ
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
OP2177ARZ-REEL7
✅ Drop-In✓ Em estoque
$3.62 / unidade
Ver ficha técnica →OP295GSZ-REEL Classificações máximas e características elétricas
| Amplifier Type | General Purpose (GP), Dual, Rail-to-Rail Output |
| Number of Circuits | 2 |
| Tipo de saída | Rail-to-Rail |
| Gain-Bandwidth Product (GBW) | 85 kHz |
| Slew Rate | 0.03 V/us |
| Input Offset Voltage (max) | 75 uV |
| Input Bias Current (max) | 20 nA |
| Input Offset Voltage Drift | 5 uV/C max |
| Supply Current (per amplifier) | 375 uA typ |
| Supply Voltage Range (Single) | 3 V to 36 V |
| Supply Voltage Range (Dual) | +/-1.5 V to +/-18 V |
| Input Common-Mode Range | Includes both rails (zero-in/zero-out) |
| Output Swing to Rail (10 kohm) | 5 mV |
| Output Swing to Rail (2 kohm) | 10 mV |
| Voltage Noise Density | 15 nV/sqrt(Hz) |
| Faixa de temperatura de operação | -40C to +125C |
| Encapsulamento | 8-SOIC (0.154", 3.90 mm Width) |
| Tipo de montagem | Surface Mount |
| Nível MSL | 1 |
| Status RoHS | Compliant |
Configuração de pinos do OP295GSZ-REEL
| Pino 1 | OUTPUT A — Output of amplifier A |
| Pino 2 | -INPUT A — Inverting input of amplifier A |
| Pino 3 | +INPUT A — Non-inverting input of amplifier A |
| Pino 4 | V- — Negative power supply |
| Pino 5 | +INPUT B — Non-inverting input of amplifier B |
| Pino 6 | -INPUT B — Inverting input of amplifier B |
| Pino 7 | OUTPUT B — Output of amplifier B |
| Pino 8 | V+ — Positive power supply |
Aplicações típicas
OP295GSZ-REEL é adequado para 7 aplicaçãos: Portable Instrumentation Signal Conditioning, Sensor Signal Conditioning (Bridge / Thermocouple / RTD), Single-Supply 3.3 V / 5 V Data Acquisition Front-End, Audio Preamplifier / Line Driver (Low-Noise Stages), Industrial 24 V Bus Signal Conditioning, Battery-Powered Transducer Amplifier, Precision Active Filter (Sallen-Key / MFB Topology).
Portable Instrumentation Signal Conditioning
The OP295GSZ-REEL fits portable instrumentation front-ends because its 75 uV max offset and 5 uV/C drift preserve DC accuracy across temperature, while the rail-to-rail input/output swings let a single 3.3 V or 5 V rail accommodate both the zero-baseline and full-scale output of a sensor bridge. The bipolar input stage delivers 20 nA max bias current that is well below the leakage of typical thin-film strain gauges, so bridge self-heating error stays negligible. Placed between the transducer and the ADC input driver, the OP295 sets the signal-chain noise floor (15 nV/sqrt(Hz)) well below the quantization noise of 16-bit converters. Trade-off: 375 uA per amplifier is higher than micropower parts, so it is not the best choice for sleep-mode battery operation.
Recomendado
Sensor Signal Conditioning (Bridge / Thermocouple / RTD)
Precision sensor signal chains benefit from the OP295GSZ-REEL's combination of low offset (75 uV max), low drift (5 uV/C), and true rail-to-rail input common-mode range that includes both supplies. In a 3.3 V single-supply design, this means a bridge signal centered at 0 V or at the positive rail can both be amplified without level-shifting tricks. The 85 kHz GBW and 0.03 V/us slew rate comfortably support filter frequencies up to ~10 kHz for typical transducer bandwidths. CBCMOS input structure gives 20 nA bias current that does not drift with input common-mode, unlike many CMOS-input rail-to-rail parts.
Recomendado
Single-Supply 3.3 V / 5 V Data Acquisition Front-End
True zero-in/zero-out capability makes the OP295GSZ-REEL ideal for single-supply data acquisition front-ends running from 3.3 V or 5 V rails, where the analog signal can span the entire ADC input range without external level shifters. The 8-SOIC dual package places two independent channels adjacent on the PCB, easing layout of differential-ended multi-channel systems. At 85 kHz GBW the part is well-matched to 12-bit to 16-bit SAR and sigma-delta converters whose input bandwidth rarely exceeds a few hundred kHz. Power dissipation stays modest at 750 uA total quiescent current from a 5 V rail, enabling battery-powered DAQ modules.
Recomendado
Audio Preamplifier / Line Driver (Low-Noise Stages)
Audio pre-amplifier stages benefit from the OP295GSZ-REEL's 15 nV/sqrt(Hz) voltage noise density, which is well below the audible noise floor of typical 16/24-bit audio converters and far quieter than generic CMOS-input rail-to-rail parts. The bipolar input stage preserves low 1/f noise corner for warm bass reproduction, while the rail-to-rail output lets a 5 V single-supply deliver a full 0 V to 5 V audio swing into 10 kohm or 2 kohm loads. CBCMOS design gives better DC accuracy than audio-grade CMOS parts without sacrificing rail-to-rail swing. Trade-off: 0.03 V/us slew rate limits full-power bandwidth to ~5 kHz at 5 Vp output, so this is a preamp/gain-stage part, not a headphone-driver part.
Recomendado
Industrial 24 V Bus Signal Conditioning
Operating directly from an unregulated industrial 24 V bus is feasible with the OP295GSZ-REEL because its supply range extends to 36 V single-supply (or +/-18 V dual-supply). This eliminates the need for a pre-regulator on the analog front-end, saving board area and cost in PLC analog input modules, industrial sensor interfaces, and process-control loops. The bipolar input stage tolerates input voltages all the way to the rails, including the 24 V common-mode that frequently appears on long cable runs. CBCMOS design delivers the DC accuracy needed for 4-20 mA loop and RTD measurements while rail-to-rail output maximizes dynamic range on the ADC side.
Recomendado
Battery-Powered Transducer Amplifier
Single-cell Li-ion (3.7 V nominal) and 9 V battery-powered transducer amplifiers are a strong fit for the OP295GSZ-REEL because its 3 V minimum supply operates from a single Li-ion cell down to depletion. The 375 uA per-amplifier quiescent current keeps total draw modest for a dual-channel design, although micropower parts like the AD8659 (20 uA) are still preferred when always-on battery life is the dominant constraint. The 75 uV max offset preserves accuracy at low signal levels typical of piezoelectric sensors and Hall-effect transducers. True rail-to-rail output maximizes ADC dynamic range on the battery's declining supply.
Recomendado
Precision Active Filter (Sallen-Key / MFB Topology)
Precision Sallen-Key and multiple-feedback (MFB) active filters benefit from the OP295GSZ-REEL's 85 kHz GBW, which comfortably supports filter cutoff frequencies up to ~10 kHz while preserving the DC accuracy of low-pass and band-pass stages. The 0.03 V/us slew rate handles typical audio and instrumentation-bandwidth filter outputs without slew-induced distortion. CBCMOS input stage preserves low offset across temperature, important for DC-coupled cascaded filter stages. Rail-to-rail output lets the filter output span the full ADC input range in a single-supply system, simplifying downstream signal chain design.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para OP295GSZ-REEL — comparação, orientação de projeto e informações de conformidade.
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Comparação com alternativas
| Parâmetro | Este produto | OP295GSZ | OP295GS-REEL7 | OP295GPZ | OP2177ARZ-REEL7 |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 8-SOIC (0.154") | 8-SOIC (0.154") | 8-SOIC (0.154") | PDIP-8 | 8-SOIC (0.154") |
| Number of Channels | 2 | 2 | 2 | 2 | 2 |
| Gain-Bandwidth Product | 85 kHz | 85 kHz | 85 kHz | 85 kHz | 1.3 MHz |
| Slew Rate | 0.03 V/us | 0.03 V/us | 0.03 V/us | 0.03 V/us | 0.5 V/us |
| Input Offset Voltage (max) | 75 uV | 75 uV | 75 uV | 75 uV | 75 uV |
| Supply Voltage Range (Single) | 3 V to 36 V | 3 V to 36 V | 3 V to 36 V | 3 V to 36 V | +/-18 V dual only |
| Quiescent Current per Amplifier | 375 uA | 375 uA | 375 uA | 375 uA | 400 uA |
| Rail-to-Rail Output | Yes | Yes | Yes | Yes | Yes (output only) |
| RoHS Compliance | Yes (matte-tin) | Yes | No (legacy lead-finish) | Yes | Yes |
Principais diferenciais
- True bipolar front-end with rail-to-rail output (CBCMOS) (vs Generic CMOS-input rail-to-rail op amps (e.g. TLC2272))
- Very wide 3 V to 36 V single-supply range (vs OP2177ARZ-REEL7)
- Low 15 nV/sqrt(Hz) voltage noise density (vs AD8605 (CMOS-input, 8 nV/sqrt(Hz))
- Zero-in/zero-out capability on a single 3.3 V or 5 V rail (vs Traditional non-rail-to-rail op amps (e.g. OP07))
Notas de projeto
Place a 0.1 uF X7R ceramic bypass capacitor as close as possible to the V+ (pin 8) supply pin, with a 10 uF tantalum or aluminum bulk capacitor on the same rail. The OP295GSZ-REEL's bipolar input stage draws ~20 nA bias current that is independent of input common-mode voltage, but the input protection diodes require the input voltage to remain within the rails; if input overdrive is possible, add 1 kohm series resistors on each input. Estimated: total quiescent power dissipation from a 5 V rail is 2 x 375 uA x 5 V = ~3.75 mW per IC, negligible for thermal design but worth noting for power-budgeting portable systems.
Keep input and feedback traces short and shielded by ground to minimize parasitic capacitance that, combined with the OP295's 85 kHz GBW, can introduce peaking above 50 kHz in high-gain configurations. Route both channels symmetrically if using the OP295GSZ-REEL as a differential amplifier to preserve common-mode rejection. Place sensitive analog grounds (sensor, reference, OP295) on a separate ground island that joins the digital ground only at the ADC ground pin to avoid digital return currents corrupting the analog reference.
The CBCMOS input stage gives rail-to-rail input common-mode range but introduces crossover distortion near the positive rail as the input differential pair transitions between NPN and PNP input sections. Avoid operating in the ~1 V region near either rail if THD matters; in audio and instrumentation applications, restrict input swing to V- + 1.5 V to V+ - 1.5 V for lowest distortion. Below this range, the OP295GSZ-REEL delivers better than 0.01% THD at 1 kHz into 2 kohm.
Do not assume that the rail-to-rail input implies zero input bias current - the OP295GSZ-REEL still draws up to 20 nA, which matters when the source impedance exceeds 100 kohm. Use the OP295 family part with bias-cancellation (OP295) only when source impedances stay below 1 Mohm; otherwise a precision JFET-input op amp such as the AD8628 is a better choice. Also note the 5 mV typical output swing to rail at 10 kohm is not the same as 0 V output; for true zero-output designs, level-shift downstream or use a negative supply.
The OP295GSZ-REEL dissipates ~3.75 mW at +/-5 V and ~15 mW at +/-15 V typical dual-supply operation, well within the 8-SOIC's thermal rating of ~150 C/W junction-to-ambient. No heatsink is required. At the absolute maximum supply voltage of +/-18 V, total dissipation approaches 27 mW (2 x 750 uA x 18 V) which is still safe but limits operation to ambient temperatures below +85 C without airflow. Estimated: junction temperature rise above 25 C ambient at +/-18 V is ~4 C, well below the 150 C absolute maximum.
Informações de conformidade
RoHS compliant per Analog Devices product page and DigiKey listing. The "Z" suffix in OP295GSZ-REEL denotes matte-tin lead-free finish. Not AEC-Q100 qualified; the OP295 family is intended for industrial and consumer applications. Halogen-free status not stated in the verified web data - set to unknown per data authenticity rules.
