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Texas Instruments OPA350PA
- Part No.:
- OPA350PA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA350PA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,339
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Product details
Overview
OPA350PA from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-voltage, single-supply operation (2.7 V to 5.5 V). It delivers 38 MHz gain-bandwidth, 22 V/µs slew rate, and ultra-low 5 nV/√Hz input voltage noise - enabling high-fidelity signal conditioning in space-constrained A/D converter driver and video processing circuits.
For engineers reviewing the OPA350PA datasheet, OPA350PA pinout, OPA350PA application, or OPA350PA equivalent, key selection criteria include rail-to-rail swing within 10 mV of supply rails under 10-kΩ load, THD+N of 0.0006% at 1 kHz, and guaranteed operation from −40°C to 85°C in SOIC-8 packaging.
Technical Context
The OPA350PA uses a complementary N/P-channel input stage to achieve rail-to-rail common-mode input range extending 100 mV beyond both supply rails, with laser trimming to minimize offset discontinuity across the transition region. Its class AB output stage enables full rail-to-rail swing while maintaining >100 dB open-loop gain up to 10 kHz.
Designed for unity-gain stability, it drives capacitive loads up to 100 pF without external compensation and supports 75-Ω video line driving per TI's test conditions. Input bias current remains ≤10 pA over temperature, and PSRR/CMRR exceed 74 dB across 10 Hz–100 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 38 MHz - supports stable closed-loop gain ≥10 at 3.8 MHz, suitable for anti-aliasing filters before 500-kSPS ADCs |
| Slew rate | 22 V/µs - enables clean 2.5 VPP output at 1 MHz without slewing distortion in unity-gain buffer configurations |
| Input voltage noise density | 5 nV/√Hz at 10 kHz - ensures <1 µVrms integrated noise in 20 kHz audio bandwidth, critical for low-level sensor interfaces |
| THD+N | 0.0006% at 1 kHz, RL = 600 Ω - meets broadcast-grade video and high-resolution audio signal chain requirements |
| Output swing from rail | ≤10 mV with 10-kΩ load - maximizes dynamic range in 3.3 V or 5 V single-supply systems, e.g., portable instrumentation |
| Supply voltage range | 2.7 V to 5.5 V - operates from Li-ion battery (3.0–4.2 V) or regulated 3.3 V/5 V rails without level-shifting circuitry |
| Quiescent current | 5.2 mA per amplifier - balances speed and power for always-on signal conditioning in battery-powered edge nodes |
Pinout & Package
OPA350PA is supplied in an 8-pin SOIC (D) package measuring 3.91 mm × 4.90 mm, rated for −40°C to 85°C operation with JEDEC-standard thermal performance (RθJA = 140.1°C/W).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection - must be left floating or tied to ground per layout best practices; no electrical function |
| 2 | Inverting input (−In) | Differential input node accepting signals down to −0.1 V and up to (V+) + 0.1 V; protected by clamping diodes |
| 3 | Noninverting input (+In) | Differential input node with identical rail-to-rail common-mode range as Pin 2; bias current ≤10 pA |
| 4 | Negative supply (V−) | Ground reference for single-supply operation; supports operation with V− at 0 V (not negative voltage) |
| 5 | NC | No internal connection - electrically isolated; no routing or termination required |
| 6 | Output | Class AB rail-to-rail output capable of sourcing/sinking ±40 mA; swings to within 10 mV of V− or V+ under 10-kΩ load |
| 7 | Positive supply (V+) | Single-supply input accepting 2.7–5.5 V; bypassing with 0.01 µF ceramic capacitor to V− is mandatory for stability |
| 8 | NC | No internal connection - unused pad; may be grounded for mechanical reinforcement but has no electrical role |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input | Common-mode range extends −0.1 V to (V+) + 0.1 V - eliminates need for level-shifting in single-supply data acquisition front-ends |
| Rail-to-rail output | Swings within 10 mV of V+ and V− with 10-kΩ load - preserves >99% of available voltage headroom in 3.3 V systems |
| Low THD+N | 0.0006% at 1 kHz - enables direct coupling into 12-bit+ ADCs without post-amplifier distortion correction |
| 75-Ω video drive | Validated 75-Ω load capability per NTSC test conditions - supports composite video buffering without external emitter-follower stages |
| Unity-gain stable | No external compensation required - simplifies PCB layout for gain-of-1 buffers in high-speed signal chains |
| MicroSize packages | SOIC-8 footprint compatible with MSOP-8 and PDIP-8 variants - allows drop-in replacement across form factors |
Applications
| Cell Phone PA Control Loop | Driving A/D Converters |
|---|---|
Use Scenario: Real-time monitoring and feedback control of power amplifier output power in GSM/UMTS handsets. IC Role / Device Role / Timing Role: Precision DC-coupled buffer amplifying detector voltage to maintain PA linearity and efficiency across battery voltage sag. Use Value: Rail-to-rail input captures full detector range (0–3.3 V); low 5 nV/√Hz noise prevents false power adjustments due to measurement uncertainty. |
Use Scenario: Driving the analog input of medium-speed sampling ADCs such as ADS7861 in portable data loggers. IC Role / Device Role / Timing Role: High-speed, low-distortion buffer isolating ADC input capacitance and absorbing charge injection kickback. Use Value: 22 V/µs slew rate settles 2.5 VPP step in ≤0.5 µs (0.01%); 38 MHz GBW supports anti-aliasing filter design up to Nyquist frequency. |
| Video Processing | Audio Processing |
Use Scenario: Buffering composite video signals in set-top boxes and HDMI transmitters requiring 75-Ω source termination. IC Role / Device Role / Timing Role: Unity-gain video driver delivering NTSC/PAL signal integrity with minimal differential gain/phase error. Use Value: 0.17% differential gain and 0.17° phase error at 1.4 VPP ensure broadcast-compliant color fidelity without external tuning components. |
Use Scenario: Low-noise preamplification of microphone or line-level signals in portable audio recorders and VoIP handsets. IC Role / Device Role / Timing Role: High-fidelity signal conditioner preserving SNR across 20 Hz–20 kHz bandwidth with minimal harmonic addition. Use Value: 0.0006% THD+N at 1 kHz and 5 nV/√Hz noise floor enable >105 dB SNR in 24-bit audio paths without post-processing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA350DGK | VSSOP-8 package (3.0 mm × 3.0 mm), 169.2°C/W RθJA vs SOIC-8's 140.1°C/W - higher thermal resistance requires derating above 3.5 mA quiescent current | Used where board area is constrained; not suitable for high-power-density layouts without thermal relief | Select OPA350DGK only when PCB real estate savings outweigh thermal performance trade-offs in ambient ≤60°C environments |
| OPA2350PA | Dual-channel version in same SOIC-8 package; identical per-channel specs but shares supply pins - increases channel count without doubling footprint | Preferred for dual-signal paths (e.g., stereo audio, differential sensor pairs) where inter-channel crosstalk <0.15 µV/V is acceptable | Choose OPA2350PA when two matched amplifiers are needed and board space is limited; verify supply decoupling suffices for both channels |
Compared with OPA350DGK and OPA2350PA, the OPA350PA offers optimal thermal performance in standard SOIC-8 layout, making it preferred for continuous high-speed operation in industrial temperature ranges without thermal derating.
Availability
OPA350PA is available at Aetrix Electronics and suitable for cell phone PA control loops, A/D converter driving, and video processing applications requiring stable component supply across automotive, industrial, and medical OEM programs.
Supply support for OPA350PA 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 OPA350PA belongs to TI's MicroAmplifier™ series - engineered specifically for low-voltage, rail-to-rail performance in portable, battery-powered, and space-constrained signal conditioning applications.
FAQ
What is the maximum operating temperature range for the OPA350PA?
The OPA350PA is specified from −40°C to +85°C for reliable operation, with extended functionality validated from −55°C to +150°C. This wide range supports deployment in automotive engine compartments and industrial motor control enclosures where ambient temperatures exceed standard commercial limits. The SOIC-8 package's thermal metrics ensure stable performance within these bounds when proper PCB copper pour and decoupling are applied.
Can the OPA350PA drive a 600-Ω load effectively?
Yes, the OPA350PA is characterized to drive 600-Ω loads with VO = 2.5 VPP while maintaining 0.0006% THD+N at 1 kHz. Its class AB output stage delivers ±40 mA output current, enabling full rail-to-rail swing even under this heavy load condition. TI's datasheet confirms performance with 600-Ω terminations in video applications, including differential gain/phase testing per NTSC standards.
Does the OPA350PA require external compensation for unity-gain stability?
No, the OPA350PA is internally compensated for unity-gain stability and requires no external components to operate stably at G = 1. Its design maintains ≥45° phase margin with 100-pF capacitive loads in unity-gain configuration, as verified in Figure 21 of the SBOS099D datasheet. This eliminates risk of oscillation in simple buffer implementations common in sensor front-ends and ADC drivers.
What is the input common-mode voltage range of the OPA350PA?
The OPA350PA supports an input common-mode voltage range from −0.1 V to (V+) + 0.1 V - extending 100 mV beyond both supply rails. This rail-to-rail input capability is achieved via parallel N- and P-channel input stages, allowing direct interfacing with sensors or DACs that output near-ground or near-V+ voltages without level-shifting circuitry.
How does the OPA350PA handle input signals exceeding the supply rails?
Input terminals of the OPA350PA are diode-clamped to the supply rails; signals exceeding (V−) − 0.3 V or (V+) + 0.3 V will forward-bias these clamps. To prevent damage, input current must be limited to ≤10 mA using series resistors - a requirement explicitly stated in Section 6.1 Absolute Maximum Ratings. TI provides guidance on resistor sizing in Figure 27 of the datasheet.
OPA350PA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 22V/µs
- Gain Bandwidth Product:
- 38 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.5 pA
- Voltage - Input Offset:
- 150 µV
- Current - Supply:
- 5.2mA
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA350PA FAQ
1.How can I place an order for OPA350PA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA350PA 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 OPA350PA reliable?
The price and inventory of OPA350PA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA350PA is usually 5 days.
3.What payment methods are accepted for OPA350PA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA350PA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA350PA?
OPA350PA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA350PA 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 OPA350PA?
For technical support, including OPA350PA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA350PA requirements.
6.How does Aetrix verify that OPA350PA is sourced from the original manufacturer or authorized distributors?
All OPA350PA 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 OPA350PA meets industry standards.
7.What is the process for return or replacement of OPA350PA?
All OPA350PA units undergo pre-shipment inspection (PSI). If there is an issue with OPA350PA, 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 OPA350PA part is unused and in its original packaging.
Return procedure for OPA350PA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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