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Texas Instruments OPA621KP-1
- Part No.:
- OPA621KP-1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA621KP-1.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,719
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Product details
Overview
OPA621KP-1 from Burr-Brown (now Texas Instruments) is a precision wideband voltage-feedback operational amplifier optimized for high-speed, low-noise, low-distortion signal conditioning in video, RF, and data acquisition systems. It delivers 500MHz gain-bandwidth, 25ns 0.01% settling time, ±150mA output drive, 2.3nV/√Hz input voltage noise, and stable operation at gains ≥ +2V/V or ≤ –2V/V - enabling use as an ADC/DAC buffer, ultrasound preamplifier, or high-resolution line driver.
For engineers reviewing the OPA621KP-1 datasheet, OPA621KP-1 pinout, OPA621KP-1 application, or OPA621KP-1 equivalent, this page provides verified technical context, package-specific pin mapping, real-world application cards, and two validated alternative parts with documented functional trade-offs for video, RF, and precision analog signal path design.
Technical Context
The OPA621KP-1 uses a classical voltage-feedback architecture with fully symmetrical differential inputs - unlike current-feedback amplifiers - ensuring compatibility with all standard op amp configurations including inverting, non-inverting, differential, and active filter topologies. Its laser-trimmed thin-film resistors optimize both DC accuracy (±200µV offset) and AC performance (50° phase margin at G = +2V/V).
It features internal ESD protection on all pins (2.5kV HBM), short-circuit current limiting (±150mA), and stability into 50Ω loads without external compensation. The device operates from ±4.0V to ±6.0V supplies, draws 26–30mA quiescent current, and maintains specified performance across –40°C to +85°C ambient temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 500MHz - enables stable closed-loop bandwidth of 500MHz at G = +2V/V for high-frequency signal chain stages. |
| Settling Time (0.01%) | 25ns - supports accurate sampling in ≥12-bit ADC buffer applications with fast step response. |
| Input Voltage Noise | 2.3nV/√Hz (1MHz–100MHz) - ensures minimal added noise in low-level preamplifier and sensor interface circuits. |
| Output Current Drive | ±150mA - directly drives 50Ω or 75Ω transmission lines, eliminating need for external buffers in video/RF line drivers. |
| Differential Gain/Phase Error | 0.05% / 0.05° at 3.58MHz - meets NTSC/PAL broadcast video fidelity requirements without post-correction. |
| Supply Voltage Range | ±4.0V to ±6.0V - requires dual-rail supply; operation outside ±7V absolute max risks permanent damage. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and medical equipment environments per KP grade specification. |
Pinout & Package
OPA621KP-1 is housed in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin 1 is marked by a notch or dot; pins are numbered counter-clockwise from top-left when viewed from component side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No internal connection | Unused; must remain unconnected - no routing or grounding permitted. |
| 2 | Inverting Input (–) | High-impedance differential input node; matched to Pin 3 for bias current cancellation in precision circuits. |
| 3 | Non-Inverting Input (+) | Symmetrical high-impedance input; laser-trimmed for low offset drift and CMR >60dB up to 100MHz. |
| 4 | Negative Supply (–VCC) | Return path for negative rail; requires local 10µF tantalum + 0.1µF ceramic bypass to ground within 5mm. |
| 5 | No internal connection | Unused; electrically isolated - no trace or pad should connect to this pin. |
| 6 | Output | Class-AB output stage capable of ±3.5V swing into 100Ω; series resistor (5–25Ω) required for >15pF capacitive loads. |
| 7 | Positive Supply (+VCC) | Power input for positive rail; same bypassing requirement as Pin 4; shared thermal path with output transistors. |
| 8 | No internal connection | Unused; floating - not tied to substrate or internal ground; leave unconnected. |
Key Features
| Feature | Design Value |
|---|---|
| Classical voltage-feedback architecture | Enables full compatibility with standard op amp theory, feedback networks, and stability analysis - unlike asymmetrical current-feedback designs. |
| Laser-trimmed input stage | Delivers ±200µV max input offset voltage and ±12µV/°C drift - critical for DC-coupled precision instrumentation and calibration circuits. |
| 50Ω/75Ω load drive capability | Eliminates external buffer stages in video distribution, RF IF amplification, and high-speed DAC output buffering. |
| Internal ESD protection (2.5kV HBM) | Reduces need for external diodes - preserves high-frequency bandwidth by avoiding added input capacitance. |
| Stable at G ≥ +2V/V or G ≤ –2V/V | Guarantees 50° phase margin without external compensation - simplifies layout and reduces BOM count in gain-setting networks. |
Applications
| Low-Noise Preamplifier | High-Resolution Video Driver |
|---|---|
Use Scenario: Amplifying weak signals from photodiode arrays or ultrasound transducers before digitization. IC Role / Device Role / Timing Role: First-stage voltage amplifier with ultra-low input noise (2.3nV/√Hz) and high linearity to preserve SNR. Use Value: Enables detection of sub-millivolt signals in medical imaging without degrading dynamic range or introducing harmonic distortion. |
Use Scenario: Driving 75Ω coaxial cable in broadcast-quality SD/HD video signal distribution. IC Role / Device Role / Timing Role: Line driver with 0.05% differential gain and 0.05° phase error at 3.58MHz NTSC frequency. Use Value: Maintains color fidelity and timing integrity over long cable runs without requiring external correction circuitry. |
| ADC Buffer for High-Speed Data Acquisition | Pulse/RF Amplifier in Test Equipment |
Use Scenario: Driving the switched-capacitor input of a 12-bit, 50MSPS flash ADC in automated test systems. IC Role / Device Role / Timing Role: Low-output-impedance buffer with 25ns 0.01% settling time to ensure accurate sampling aperture. Use Value: Prevents missing codes and integral nonlinearity errors caused by incomplete settling before conversion. |
Use Scenario: Amplifying narrow RF pulses (10–100MHz) in radar receiver front-ends or spectrum analyzer IF stages. IC Role / Device Role / Timing Role: Wideband gain block with 500MHz GBW and –70dBc third-harmonic distortion at 10MHz. Use Value: Preserves pulse shape and spectral purity while delivering ±3.5V swing into 50Ω loads without clipping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wideband precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA691IDBVT | Higher GBW (1.1GHz), lower noise (1.1nV/√Hz), but only ±65mA output drive and unstable below G = +5V/V. | Better for ultra-wideband small-signal gain; unsuitable for 50Ω line driving or low-gain video buffering. | Select OPA691IDBVT only when bandwidth >700MHz is required and load impedance ≥300Ω. |
| LMH6629MA/NOPB | Lower noise (0.94nV/√Hz), higher slew rate (3000V/µs), but 100ns 0.01% settling time and no guaranteed differential gain spec. | Preferred for ultra-low-noise preamp stages; not validated for broadcast video timing fidelity. | Choose LMH6629MA/NOPB for sensor front-ends where speed is secondary to noise floor, not for video/RF line driving. |
Compared with OPA621KP-1, OPA691IDBVT trades output drive and low-gain stability for higher bandwidth, while LMH6629MA/NOPB prioritizes noise reduction over settling accuracy and video compliance - making OPA621KP-1 uniquely balanced for applications demanding simultaneous speed, drive strength, and video-grade linearity.
Availability
OPA621KP-1 is available at Aetrix Electronics and suitable for industrial instrumentation, medical ultrasound systems, and broadcast video infrastructure requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA621KP-1 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
Burr-Brown Corporation, acquired by Texas Instruments in 2000, specialized in high-precision analog ICs for measurement, signal conditioning, and data conversion applications.
The OPA621KP-1 belongs to Burr-Brown's OPA6xx wideband precision op amp family, designed specifically for demanding analog signal paths where speed, noise, and fidelity must coexist - such as video, ultrasound, and high-speed data acquisition.
FAQ
What is the maximum safe supply voltage for the OPA621KP-1?
The OPA621KP-1 has an absolute maximum supply rating of ±7VDC. Operation beyond this - including transient spikes - risks permanent damage. For reliable long-term use, the recommended operating range is ±4.0V to ±6.0V. Exceeding ±7V, even briefly, may destroy internal junctions or ESD protection diodes. Always verify power supply ramp rates and sequencing during system startup to avoid overstress conditions in the OPA621KP-1.
Can the OPA621KP-1 drive a 50Ω load directly without external components?
Yes, the OPA621KP-1 is explicitly characterized to drive 50Ω loads directly, delivering ±3.0V output swing with <0.05% differential gain error at 3.58MHz. However, for optimal stability with capacitive loads >15pF - such as PCB traces or ADC input capacitance - a 5Ω–25Ω series resistor must be placed between the OPA621KP-1 output and the load. This isolation prevents peaking or oscillation while preserving bandwidth and settling performance.
Is the OPA621KP-1 pin-compatible with other OPA6xx-series devices?
No, the OPA621KP-1 is not pin-compatible with other OPA6xx-series op amps like OPA691 or OPA656. While all share the 8-pin DIP/SO-8 footprint, internal pin functions differ: OPA621KP-1 has three no-connect pins (1, 5, 8), whereas OPA691 uses Pin 1 for shutdown and Pin 5 for compensation. Substituting without verifying pin mapping will result in malfunction or damage. Always consult the specific device's pin configuration diagram before board reuse.
Does the OPA621KP-1 require external offset nulling circuitry?
No, the OPA621KP-1 features laser-trimmed input offset voltage (±200µV max) and does not require external nulling for most applications. An optional trim circuit (using 47kΩ potentiometer between Pins 1 and 8, referenced to ±VCC) is provided in the datasheet for ultra-high-precision cases, but adding it introduces noise susceptibility and degrades thermal drift performance. For >12-bit systems, matching input impedances (e.g., equal resistors on both inputs) is more effective than external trimming for minimizing bias-current-induced errors in the OPA621KP-1.
What thermal considerations apply to the OPA621KP-1 in continuous 50Ω load operation?
Under worst-case conditions - ±5V supplies, 0V output, 50Ω load - the OPA621KP-1 dissipates up to 1W (280mW quiescent + 750mW load). With θJA = 100°C/W for the KP package, junction temperature rise reaches 100°C above ambient. At +85°C ambient, TJ = 185°C - exceeding the 175°C absolute max. Therefore, derating or heatsinking is mandatory for sustained 50Ω drive. Reduce supply voltage or add airflow to maintain TJ ≤ 175°C in the OPA621KP-1.
OPA621KP-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Differential
- Slew Rate:
- 500V/µs
- Gain Bandwidth Product:
- 500 MHz
- -3db Bandwidth:
- 500 MHz
- Current - Input Bias:
- 18 µA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 26mA
- Current - Output / Channel:
- 150 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA621KP-1 FAQ
1.How can I place an order for OPA621KP-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA621KP-1 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 OPA621KP-1 reliable?
The price and inventory of OPA621KP-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA621KP-1 is usually 5 days.
3.What payment methods are accepted for OPA621KP-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA621KP-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA621KP-1?
OPA621KP-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA621KP-1 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 OPA621KP-1?
For technical support, including OPA621KP-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA621KP-1 requirements.
6.How does Aetrix verify that OPA621KP-1 is sourced from the original manufacturer or authorized distributors?
All OPA621KP-1 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 OPA621KP-1 meets industry standards.
7.What is the process for return or replacement of OPA621KP-1?
All OPA621KP-1 units undergo pre-shipment inspection (PSI). If there is an issue with OPA621KP-1, 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 OPA621KP-1 part is unused and in its original packaging.
Return procedure for OPA621KP-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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