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Texas Instruments OPA377AID
- Part No.:
- OPA377AID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA377AID.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,968
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Product details
Overview
OPA377AID from Texas Instruments is a single, rail-to-rail output CMOS operational amplifier optimized for low-voltage, single-supply applications. It delivers 5.5MHz gain-bandwidth, 7.5nV/√Hz input voltage noise at 1kHz, 0.2pA typical input bias current, 1mV max offset voltage, and operates from 2.2V to 5.5V supply - enabling precision photodiode preamplification in battery-powered sensor front-ends.
For engineers reviewing the OPA377AID datasheet, OPA377AID pinout, OPA377AID application, or OPA377AID equivalent, key selection criteria include its ultra-low input bias current for high-impedance source interfacing, EMI-hardened input filtering, unity-gain stability with capacitive load drive up to 250pF, and guaranteed operation from –40°C to +125°C in SOIC-8 packaging.
Technical Context
The OPA377AID employs a CMOS input stage enabling femtoampere-level input bias current and high input impedance (>1013 Ω), critical for photodiode and piezoelectric sensor signal conditioning. Its internal EMI input filter (–3dB at ~75MHz) suppresses RF rectification effects without external components.
It features rail-to-rail output swing (within 10mV of rails at 10kΩ load), wide common-mode input range (extending 100mV beyond supplies), and robust PSRR (≥70dB from 100Hz to 100kHz), making it suitable for noisy, unregulated battery systems where supply rejection and output headroom are essential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 5.5MHz - supports stable closed-loop operation up to 100kHz with gain ≥10, suitable for anti-aliasing filters ahead of 16-bit ADCs like ADS8327. |
| Input Bias Current | ±0.2pA (typ) - enables accurate amplification of nanoamp-level photocurrents without significant DC error in transimpedance configurations. |
| Input Voltage Noise | 7.5nV/√Hz at 1kHz - ensures minimal added noise in low-level analog signal chains, especially critical for sensor preamps below 100kHz. |
| Offset Voltage | 1mV (max) - guarantees ≤10mV output error at unity gain with 10V supply, supporting 12-bit+ system accuracy without trimming. |
| Supply Voltage Range | 2.2V to 5.5V - allows direct operation from single Li-ion cells (3.0–4.2V) or regulated 3.3V/5V rails without LDO overhead. |
| Quiescent Current | 0.76mA/ch (typ) - balances performance and power efficiency for always-on industrial sensing nodes with <1mW total dissipation. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, motor control feedback, and industrial PLC I/O modules. |
Pinout & Package
OPA377AID is supplied in an 8-pin SOIC (D) package with standard industry footprint (5.3mm × 6.2mm, 1.27mm pitch). Thermal pad is not present; junction-to-ambient thermal resistance is 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No internal connection | Unused pin; must be left floating or tied to ground per layout best practice - no functional impact on operation. |
| 2 (–IN) | Inverting input | High-impedance CMOS node; connects to feedback network in transimpedance or inverting configurations. |
| 3 (+IN) | Non-inverting input | Accepts high-Z sensor signals (e.g., photodiode cathode); common-mode range extends 100mV beyond V– and V+ rails. |
| 4 (V–) | Negative supply | Ground reference for single-supply operation; also serves as thermal and EMI return path for internal protection diodes. |
| 5 (OUT) | Amplifier output | Rail-to-rail capable (10mV from rails @ 10kΩ); drives capacitive loads ≤250pF directly in unity-gain buffer mode. |
| 6 (NC) | No internal connection | Unused pin; electrically isolated - no routing or grounding required. |
| 7 (V+) | Positive supply | Accepts 2.2V–5.5V; requires 0.1µF ceramic bypass capacitor placed adjacent to pin for EMI immunity and stability. |
| 8 (NC) | No internal connection | Unused pin; no internal bond wire - may be omitted from PCB layout or grounded for mechanical rigidity only. |
Key Features
| Feature | Design Value |
|---|---|
| EMI Input Filtering | Integrated low-pass filter (–3dB at ~75MHz) reduces RF-induced offset shift in noisy industrial environments without external RC networks. |
| Rail-to-Rail Output | Swings within 10mV of V+ and V– at 10kΩ load, maximizing dynamic range in 3.3V systems where headroom is constrained. |
| Unity-Gain Stable | Operates stably at G = +1 without external compensation - simplifies design of noninverting buffers for ADC driving and signal isolation. |
| Low Quiescent Current | 0.76mA typical per amplifier enables >1-year battery life in portable gas sensors or wearable health monitors using coin-cell sources. |
| Wide Supply Range | 2.2V–5.5V operation eliminates need for dedicated LDOs when interfacing with mixed-voltage microcontrollers or energy-harvesting PMUs. |
Applications
| Photodiode Preamplifier | Piezoelectric Sensor Preamplifier |
|---|---|
Use Scenario: Amplifying weak current from silicon photodiodes in optical smoke detectors or pulse oximeters. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photocurrent to voltage with minimal input bias error and low noise. Use Value: 0.2pA input bias current prevents signal loss across >1GΩ feedback resistors; 7.5nV/√Hz noise preserves SNR in sub-100nA signal paths. |
Use Scenario: Conditioning high-impedance charge output from accelerometers or vibration sensors in predictive maintenance nodes. IC Role / Device Role / Timing Role: Charge amplifier with ultra-high input impedance to avoid signal attenuation from sensor capacitance. Use Value: >1013 Ω input impedance minimizes loading of piezoelectric elements; rail-to-rail output maximizes ADC utilization in 3.3V systems. |
| Sensor Signal Conditioning | Audio Equipment |
Use Scenario: Front-end amplification for RTD, thermistor, or bridge-based pressure sensors in HVAC controllers. IC Role / Device Role / Timing Role: Precision gain stage with low offset drift (<2µV/°C) and high CMRR (>70dB) rejecting supply and ground noise. Use Value: 0.32µV/°C typical offset drift ensures <1°C error over –40°C to +85°C ambient; 90dB CMRR rejects common-mode interference from shared PCB grounds. |
Use Scenario: Line-level buffering and active filtering in portable DAC headphone amplifiers or studio monitor inputs. IC Role / Device Role / Timing Role: Low-noise, low-distortion unity-gain buffer isolating DAC output from cable capacitance and volume potentiometers. Use Value: 0.00027% THD+N at 1kHz preserves audio fidelity; 2V/ms slew rate supports full-scale 20kHz sine waves without slewing distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA377AIDBVR | SOT-23-5 package (5-pin), same electrical specs, 3000-unit tape-and-reel, smaller footprint (2.9mm × 1.6mm). | Better suited for space-constrained portable devices; lacks two NC pins, limiting layout flexibility for grounding or thermal relief. | Select OPA377AIDBVR when board area is critical and SOIC-8 footprint is unavailable; verify thermal performance under 0.76mA load in confined enclosures. |
| OPA2377AID | Dual-channel version in same SOIC-8 package; identical per-channel specs but shares supply pins and thermal mass. | Reduces component count in multi-sensor systems (e.g., dual-axis inclinometer), but channel separation is 0.5µV/V - insufficient for simultaneous high-precision measurements. | Choose OPA2377AID only when two independent amplifiers are needed and crosstalk <1ppm is acceptable; otherwise, use two OPA377AID for true isolation. |
Compared with OPA377AID, OPA377AIDBVR offers identical performance in a miniaturized package ideal for wearables, while OPA2377AID provides dual functionality at the cost of inter-channel coupling - making OPA377AID the optimal choice for single-channel, high-isolation, production-ready designs requiring SOIC-8 manufacturability.
Availability
OPA377AID is available at Aetrix Electronics and suitable for photodiode preamplification, piezoelectric sensor interfacing, and precision analog front-ends requiring stable component supply across automotive, industrial, and medical device programs.
Supply support for OPA377AID 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 decades of expertise in precision op amps and signal chain solutions.
The OPA377 family was designed specifically for low-noise, low-power, single-supply signal conditioning in battery-operated and space-constrained systems - emphasizing ultra-low input bias current, EMI resilience, and rail-to-rail output capability.
FAQ
What is the maximum capacitive load the OPA377AID can drive in unity-gain configuration?
The OPA377AID can directly drive up to 250pF of pure capacitive load while maintaining stability in unity-gain buffer configuration. This value is confirmed in the Typical Characteristics section (Figure 15) of the SBOS504B datasheet. For loads exceeding 250pF, a small series resistor (10Ω–20Ω) between the OPA377AID output and the capacitive load is recommended to preserve phase margin without degrading DC accuracy significantly.
Does the OPA377AID require external input protection when used with photodiodes?
No, the OPA377AID incorporates internal ESD protection diodes on all pins, including input terminals clamped to V+ and V– rails. As long as input current is limited to ±10mA (per Absolute Maximum Ratings), no external protection is needed. In photodiode transimpedance applications, the feedback resistor inherently limits current - making external protection unnecessary for standard configurations using OPA377AID.
Is the OPA377AID pin-compatible with other members of the OPA377 family?
Yes - the OPA377AID (SOIC-8) shares identical pinout with the dual OPA2377AID and quad OPA4377AIPW in their respective SOIC-8 and TSSOP-14 packages for pins 1–8. However, pin 1 (NC), 6 (NC), and 8 (NC) are unused in OPA377AID, whereas OPA2377AID uses pins 1, 6, and 8 for second amplifier functions. Thus, OPA377AID is not drop-in replaceable for OPA2377AID without PCB redesign.
What is the input common-mode voltage range specification for OPA377AID?
The OPA377AID supports an input common-mode voltage range from (V–) – 0.1V to (V+) + 0.1V - extending 100mV beyond both supply rails. This is explicitly specified in the Electrical Characteristics table (page 3 of SBOS504B) and enables robust operation with inputs near ground or near V+ in single-supply systems. Operation outside this range may cause increased offset or reduced CMRR.
How does the OPA377AID's EMI filtering affect its AC performance?
The OPA377AID's integrated EMI input filter has a –3dB cutoff at ~75MHz and imposes no degradation on audio- or sensor-bandwidth performance (DC to 100kHz). Its 20dB/decade roll-off attenuates RF interference before rectification occurs, preventing DC offset shifts during EMI exposure - verified in Application Information (Section 9.2.3). No bandwidth sacrifice is incurred for EMI immunity in normal signal-path operation.
OPA377AID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- 5.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 250 µV
- Current - Supply:
- 760µA
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 2.2 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA377AID FAQ
1.How can I place an order for OPA377AID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA377AID 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 OPA377AID reliable?
The price and inventory of OPA377AID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA377AID is usually 5 days.
3.What payment methods are accepted for OPA377AID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA377AID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA377AID?
OPA377AID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA377AID 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 OPA377AID?
For technical support, including OPA377AID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA377AID requirements.
6.How does Aetrix verify that OPA377AID is sourced from the original manufacturer or authorized distributors?
All OPA377AID 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 OPA377AID meets industry standards.
7.What is the process for return or replacement of OPA377AID?
All OPA377AID units undergo pre-shipment inspection (PSI). If there is an issue with OPA377AID, 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 OPA377AID part is unused and in its original packaging.
Return procedure for OPA377AID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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