THS4281D - 90MHz, 35V/us Low-Power RRIO Op Amp | Texas Instruments
N.º da peça: THS4281D ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $4.92 | $4,92 |
| 10 | $4.42 | $44,20 |
| 100 | $3.76 | $376,00 |
| 500 | $3.24 | $1.620,00 |
| 1.000 | $2.91 | $2.910,00 |
THS4281D Visão geral
An operational amplifier is an analog signal-conditioning semiconductor that compares two inputs and drives its output according to external feedback. The THS4281 belongs to the hierarchy of voltage-feedback amplifier, operational amplifier, analog IC, and semiconductor. Its rail-to-rail input stage accepts signals close to the supply rails, while its rail-to-rail output stage provides useful output swing near either rail.
The BiCom-II process supports a combination of speed and low power. Verified device data identifies a 90 MHz unity-gain bandwidth, 35 V/us slew rate, and typical 750 uA quiescent current at 5 V. These characteristics make the amplifier suitable for portable instrumentation, low-power signal conditioning, active filtering, buffer stages, and high-speed analog systems where bandwidth matters more than nanoamp-level bias current.
The wide supply range allows operation from 3.3 V and 5 V systems, as well as higher-voltage analog rails up to the verified 15 V maximum single-supply limit. Rail-to-rail input and output behavior increases usable signal range in low-voltage designs, although output-headroom, loading, common-mode range, stability, and noise still require verification for the selected gain and supply condition.
Typical uses include portable test equipment, sensor signal conditioning, active filters, small-signal transducers, and low-power analog interfaces. Because it is a voltage-feedback device, feedback-network values and parasitic capacitance strongly influence bandwidth and stability. Designers should use short, low-inductance feedback paths and follow the manufacturer's recommended operating and layout guidance.
A key design trade-off is speed versus power: the THS4281D provides substantially more bandwidth than general-purpose low-power amplifiers while consuming 750 uA at 5 V, but it is not automatically the best choice where microamp or picoamp input bias, very low offset voltage, or ultra-low-noise operation dominates.
This product record combines verified manufacturer specifications, package information, sourcing references, application guidance, and replacement qualification limits. Alternative parts are listed only when same-package, pin-compatible evidence is available; otherwise missing qualification data is disclosed rather than inferred.
Alternativas drop-in para THS4281D — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
THS4281DG4
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
THS4281D Classificações máximas e características elétricas
| Amplifier Type | Voltage-feedback operational amplifier |
| Number of Channels | 1 channel |
| Unity-Gain Bandwidth | 90 MHz |
| Slew Rate | 35 V/us |
| Single-Supply Voltage Range | 2.7 V to 15 V |
| Dual-Supply Voltage Range | +/-1.35 V to +/-7.5 V |
| Corrente de repouso | 750 uA at 5 V |
| Input Common-Mode Range | Rail-to-rail input |
| Output Swing | Rail-to-rail output |
| Process Technology | BiCom-II |
| Encapsulamento | 8-pin SOIC |
| Tipo de montagem | Surface mount |
| Status RoHS | unknown |
| REACH Status | unknown |
Guia de Configuração de Pinos do THS4281D 8-pin soic
Configuração de pinos para THS4281D (pacote 8-pin soic). Este componente analógico possui pinos de entrada, saída e alimentação. Consulte o datasheet do fabricante para configurações de offset null, compensação e pino de enable. Ideal para circuitos de condicionamento de sinal e amplificadores.
Nenhum dado detalhado de pinagem disponível para THS4281D.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
THS4281D é adequado para 6 aplicaçãos: Portable Instrumentation Signal Conditioning, Low-Power Active Filtering, High-Speed Analog Buffer, Audio Preamplifier Front End, Industrial Sensor Interface, Communication Interface Conditioning.
Portable Instrumentation Signal Conditioning
THS4281D fits portable instrumentation because it combines a verified 90 MHz unity-gain bandwidth with only 750 uA typical current at a 5 V supply. Place it between a sensor or transducer and an ADC driver stage to provide voltage gain when the signal bandwidth requires it. The rail-to-rail input and output maximize signal range in compact systems, while 35 V/us slew rate reduces distortion on fast transitions. The main qualification is precision: offset, input bias, noise, and settling performance must be checked against the sensor and ADC requirements.
Recomendado
Low-Power Active Filtering
THS4281D is appropriate for active filters that require substantially more bandwidth than a general-purpose micropower amplifier. Its 90 MHz unity-gain bandwidth leaves design headroom for higher-order filters, while the 35 V/us slew rate supports larger-amplitude signals without excessive rise-time limiting. At a 5 V supply, the verified 750 uA quiescent current helps portable equipment balance filter response and energy use. Component tolerances, op-amp noise, load, and closed-loop stability remain decisive for accurate filter behavior.
Recomendado
High-Speed Analog Buffer
Use THS4281D as a unity-gain or moderate-gain buffer when the downstream load benefits from the part's 90 MHz bandwidth and 35 V/us slew rate. Rail-to-rail input and output behavior are valuable when the source and destination operate near 3.3 V or 5 V rails. A buffer does not create extra voltage range, so verify output loading, capacitive drive, settling, and stability. The 750 uA current at 5 V remains reasonable for a portable design but is higher than a deeply micropower buffer.
Recomendado
Audio Preamplifier Front End
THS4281D can serve in a low-voltage audio preamplifier path when bandwidth and slew rate are more important than ultra-low input-bias current. The verified 35 V/us slew rate handles fast signal edges, and the 90 MHz unity-gain bandwidth provides more loop bandwidth than ordinary low-speed audio amplifiers. Rail-to-rail operation supports 3.3 V and 5 V portable systems. Engineers must still evaluate input noise, offset, THD specifications, output swing, and the exact gain network because those figures were not supplied in the verified excerpt.
Recomendado
Industrial Sensor Interface
THS4281D is suitable for conditioning signals from suitable industrial sensors when the sensor bandwidth is high and the interface can operate from its verified 2.7 V to 15 V supply range. Rail-to-rail input capability is useful near low-voltage sensor outputs, while the 90 MHz bandwidth and 35 V/us slew rate preserve rapid signal transitions. The op amp adds only one amplifier channel, so dual-signal or isolated designs may need another device. Input common-mode details beyond the verified rail-to-rail designation, noise, offset, and industrial temperature qualification require datasheet review.
Recomendado
Communication Interface Conditioning
THS4281D can condition bursty or rapidly changing analog signals around a communication link when the selected supply and loading are compatible. Its 90 MHz unity-gain bandwidth and 35 V/us slew rate provide useful transient response, while 750 uA current at 5 V supports power-sensitive portable designs. Rail-to-rail input and output improve headroom in compact systems. It does not replace a dedicated line driver or transceiver; designers must verify bandwidth allocation, output drive, noise, distortion, and recovery time in the complete interface.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para THS4281D — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | THS4281DG4 |
|---|---|---|
| Brand | Texas Instruments | Texas Instruments |
| Package | 8-pin SOIC | 8-pin SOIC - related family; exact package code should be confirmed |
| Amplifier Type | Voltage-feedback operational amplifier | THS4281 family voltage-feedback operational amplifier |
| Input and Output Range | Rail-to-rail input and output | THS4281 family identified as rail-to-rail input/output; exact variant data needed |
Principais diferenciais
- High bandwidth in a low-power amplifier (vs NE5532D)
- Rail-to-rail signal-path coverage (vs THS4281DG4)
- Power-conscious speed tradeoff (vs General-purpose low-power operational amplifier)
Notas de projeto
Keep the feedback loop compact and use a resistor ratio consistent with the intended closed-loop gain. The verified 90 MHz unity-gain bandwidth means parasitic capacitance in the feedback node and output can materially affect phase margin. Place the feedback components adjacent to the amplifier pins, maintain short output routing, and test the completed board with the intended load rather than relying only on simulation.
Estimated power at 5 V is 3.75 mW, calculated from the verified 750 uA quiescent current and 5 V supply: 5 V times 0.00075 A. This excludes output-current effects and external circuit losses. Bypass each supply connection close to the device with capacitors selected from the manufacturer guidance, and check startup and shutdown behavior if the analog node must remain controlled during power transitions.
Use a quiet, continuous ground reference and avoid routing the input and output nets beneath noisy power-converter paths. Place decoupling capacitance at the physical supply pins, and observe the exposed limitations of the SOIC package when it is the only thermal path. Keep test points and probing arrangements from injecting capacitance onto a high-bandwidth node. Analog and digital return-current paths should follow the completed board's reference-plane strategy.
Do not assume that rail-to-rail input or output means exact rail contact under every condition. Output current, frequency, gain, load, and supply voltage can reduce usable swing. Also avoid selecting the amplifier solely from 90 MHz bandwidth: verify offset, noise, input bias, settling, output drive, and temperature limits from the complete manufacturer datasheet before treating it as a precision or industrial component.
Informações de conformidade
The supplied official and distributor excerpts do not provide verified RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. These fields remain unknown rather than inferred.