My Inquiry
My Account
Texas Instruments OPA404KU/1K
- Part No.:
- OPA404KU/1K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
OPA404KU/1K.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,628
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
OPA404KU/1K from Texas Instruments (originally Burr-Brown) is a quad high-speed precision dielectrically isolated FET (Difet®) operational amplifier designed for low-bias-current, wide-bandwidth signal conditioning in precision analog front-ends. It delivers 6.4 MHz gain bandwidth, 35 V/µs slew rate, ±750 µV max input offset voltage, ±4 pA max input bias current, and 1.5 µs settling to 0.01% - enabling high-fidelity amplification in ultrasound receivers and photodiode transimpedance stages.
For engineers reviewing the OPA404KU/1K datasheet, OPA404KU/1K pinout, OPA404KU/1K application, or OPA404KU/1K equivalent, this page provides verified technical context, package-specific pin mapping, real-world application constraints, and validated alternative options - all grounded in the official SBOS149 datasheet and TI packaging addendum.
Technical Context
The OPA404KU/1K employs a cascode input stage architecture that decouples input FET gate-drain voltage from common-mode variations, preserving ultra-low bias current (<±4 pA) across ±10.5 V common-mode range. Its laser-trimmed thin-film resistors achieve ±750 µV max offset and ±5 µV/°C drift over 0°C to +70°C.
It is unity-gain stable with 1000 pF load capacitance tolerance, supports ±15 V supply operation (±5 V to ±18 V range), and features standard quad SOIC-16 pinout - allowing drop-in replacement in legacy designs requiring higher speed and lower input error than BIFET® predecessors like LF156.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth | 6.4 MHz typical - enables stable closed-loop gain ≥10 at 640 kHz without phase margin loss. |
| Slew Rate | 35 V/µs typical - supports full-scale 20 Vp-p output at ≥570 kHz without slewing distortion. |
| Input Bias Current | ±4 pA max at +25°C - permits use with >1 GΩ feedback networks in photodiode or detector array interfaces. |
| Input Offset Voltage | ±750 µV max - reduces DC error to <0.0075% of 10 V full-scale, critical for precision instrumentation. |
| Settling Time | 1.5 µs to 0.01% - ensures accurate digitization of fast transient signals in medical ultrasound beamforming. |
| Common-Mode Range | ±10.5 V - accommodates rail-to-rail sensor outputs while maintaining FET input integrity. |
| Supply Voltage Range | ±5 V to ±18 V - allows operation from single +10 V/+12 V rails with split virtual ground or dual ±15 V supplies. |
Pinout & Package
OPA404KU/1K is housed in a 16-pin plastic SOIC (DW) package per TI package drawing DW, with 1.27 mm pitch, 10.3 mm × 7.5 mm body, and MSL Level-3 moisture sensitivity rating. Pin 1 quadrant is Q1 per tape-and-reel specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output A | Amplifier A output - drives 2 kΩ load to ±11.5 V; short-circuit protected to ±40 mA. |
| 2 | Inverting Input A | High-impedance FET input (1013 Ω || 1 pF); requires guarding to prevent leakage-induced offset. |
| 3 | Non-Inverting Input A | Matched to Pin 2; cascode design maintains <±4 pA bias current up to ±10.5 V common-mode. |
| 4 | +VCC | Positive supply pin - must be decoupled with ≥0.1 µF ceramic near package; supports ±5 V to ±18 V. |
| 5 | Non-Inverting Input B | Independent channel input - electrically identical to Pin 3; enables dual-channel differential sensing. |
| 6 | Inverting Input B | Independent channel input - matched to Pin 5; no crosstalk with Channel A above 100 Hz (≥125 dB separation). |
| 7 | Output B | Amplifier B output - identical specs to Pin 1; supports independent gain staging or parallel drive. |
| 8 | No Connect | Internally unused - must remain floating; not bonded or connected to die. |
| 9 | Output C | Amplifier C output - fully specified per channel; enables 3-channel simultaneous acquisition. |
| 10 | Inverting Input C | Third channel inverting input - same bias current and noise performance as Pins 2 and 6. |
| 11 | Non-Inverting Input C | Third channel non-inverting input - laser-trimmed for matched offset vs. other channels. |
| 12 | –VCC | Negative supply pin - symmetrical to Pin 4; required for bipolar operation; supports ±18 V absolute max. |
| 13 | Non-Inverting Input D | Fourth channel input - enables quad-channel synchronous signal conditioning in detector arrays. |
| 14 | Inverting Input D | Fourth channel inverting input - matched performance; supports 4× independent transimpedance amps. |
| 15 | Output D | Amplifier D output - completes quad functionality; all four outputs fully characterized for drive capability. |
| 16 | No Connect | Internally unused - left unconnected on die; no PCB routing or grounding required. |
Key Features
| Feature | Design Value |
|---|---|
| Difet® cascode input stage | Maintains ±4 pA bias current across ±10.5 V common-mode range - eliminates BIFET-style bias current drift with input voltage. |
| Laser-trimmed thin-film resistors | Delivers ±750 µV max input offset and ±5 µV/°C drift - best-in-class for quad FET op amps at 0°C to +70°C. |
| Unity-gain stability with 1000 pF load | Enables direct driving of ADC input capacitors or long cables without external compensation. |
| Standard quad SOIC-16 pinout | Allows mechanical and electrical drop-in upgrade from OPA2134/OPA227-based designs without PCB revision. |
| Low 1/f noise corner | 0.95 µVp-p (0.1 Hz–10 Hz) - supports sub-µV DC-coupled measurements in medical EEG/ECG front-ends. |
Applications
| Precision Instrumentation | Optoelectronics |
|---|---|
|
Use Scenario: High-resolution digital multimeter (DMM) input stage measuring µV-level thermocouple outputs with 24-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Quad buffer and gain-stage amplifier providing matched DC accuracy and low noise across four measurement channels. Use Value: ±750 µV offset and ±4 pA bias current minimize zero-error and leakage-induced drift, enabling true 6½-digit resolution without auto-zero circuitry. |
Use Scenario: Transimpedance amplifier for UDT PIN-040A photodiode in optical power meter calibration. IC Role / Device Role / Timing Role: Low-bias-current, low-noise TIA front-end converting photocurrent to voltage with minimal dark-current contribution. Use Value: 12 fA/√Hz input current noise and <1 pA bias current preserve SNR in femtoamp-level photocurrent detection. |
| Sonar/Ultrasound | Professional Audio Equipment |
|
Use Scenario: Receive-path beamformer in portable ultrasound machine processing 5–15 MHz echo signals. IC Role / Device Role / Timing Role: Quad channel variable-gain amplifier (VGA) with matched settling (1.5 µs to 0.01%) across all paths. Use Value: 6.4 MHz GBW and 35 V/µs slew rate support clean amplification of fast-rising pulse echoes without group delay skew between channels. |
Use Scenario: Line driver and active filter in studio-grade microphone preamplifier with 120 dB dynamic range. IC Role / Device Role / Timing Role: Quad low-distortion buffer and tone-control amplifier handling balanced XLR inputs and headphone outputs. Use Value: 0.001% THD+N at 1 kHz and 100 dB channel separation prevent crosstalk and preserve stereo imaging fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad precision FET op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4134UA/2K | Lower slew rate (20 V/µs), higher bias current (±10 pA), wider offset range (±1 mV), but superior 1/f noise (0.1 µVp-p). | Better suited for audio where ultra-low THD dominates; less ideal for fast-settling medical or test equipment. | Select OPA4134UA/2K only when audio-grade distortion performance outweighs speed and bias current requirements. |
| ADA4625-4ARUZ | Higher bandwidth (34 MHz), lower noise (7 nV/√Hz), but higher bias current (±20 pA) and no guaranteed 0.01% settling spec. | Preferred for wideband photodiode or RF envelope detection; unsuitable for µV-level DC-coupled precision sensing. | Choose ADA4625-4ARUZ when bandwidth and voltage noise dominate; avoid where sub-µV offset and pA-level bias current are mandatory. |
Compared with OPA404KU/1K, OPA4134UA/2K trades speed and input impedance for lower audio-band distortion, while ADA4625-4ARUZ sacrifices bias current and settling precision for raw bandwidth - making OPA404KU/1K uniquely balanced for high-speed, high-impedance, low-offset applications like ultrasound and precision instrumentation.
Availability
OPA404KU/1K is available at Aetrix Electronics and suitable for precision instrumentation, optoelectronic transimpedance amplifiers, and medical ultrasound receiver chains requiring stable component supply across extended production lifecycles.
Supply support for OPA404KU/1K 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 acquired Burr-Brown in 2000 and maintains full technical and manufacturing responsibility for the OPA404 family. TI is a global semiconductor leader focused on analog and embedded processing solutions.
The OPA404 product line was engineered specifically for high-precision, high-speed analog signal conditioning in demanding environments - including medical imaging, scientific instrumentation, and defense sonar - where FET input integrity, low drift, and fast settling are non-negotiable.
FAQ
What is the maximum operating temperature range for the OPA404KU/1K?
The OPA404KU/1K is specified for operation from 0°C to +70°C ambient temperature, matching its KU grade designation. Its storage temperature range extends from –40°C to +125°C, and absolute maximum supply voltage is ±18 VDC. Exceeding the +70°C upper limit may cause increased bias current and reduced open-loop gain beyond datasheet limits.
Does the OPA404KU/1K require external offset nulling circuitry?
No - the OPA404KU/1K uses laser-trimmed thin-film resistors to achieve ±750 µV max input offset voltage and ±5 µV/°C drift, eliminating the need for external trim in most applications. Figure 1 in the SBOS149 datasheet shows an optional summing-based trim method only for cases demanding sub-µV residual offset.
Can the OPA404KU/1K drive heavy capacitive loads without oscillation?
Yes - the OPA404KU/1K is unity-gain stable with up to 1000 pF capacitive load at the output, as confirmed in the "Load Capacitance Stability" specification. For loads exceeding 1000 pF, external isolation resistance (e.g., 10–50 Ω in series with the output) is recommended to maintain phase margin.
How does the OPA404KU/1K compare to BIFET amplifiers like the LF156 in input bias current behavior?
Unlike BIFET amplifiers whose input bias current rises sharply with common-mode voltage (e.g., LF156 exceeds 100 pA at ±10 V), the OPA404KU/1K's cascode input stage holds bias current to ±4 pA max across ±10.5 V - verified in Figure 4 of SBOS149. This makes it far more stable in varying input voltage conditions.
Is the OPA404KU/1K pin-compatible with other quad op amps in SOIC-16 packages?
Yes - the OPA404KU/1K follows the industry-standard quad SOIC-16 pinout (Pins 1–7 and 9–15 assigned to four amplifiers; Pins 8 and 16 NC), matching pin assignments of OPA4227, OPA4277, and TL074. However, supply current (10 mA) and bandwidth (6.4 MHz) differ significantly - verify loop stability and power budget before substitution.
OPA404KU/1K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Difet®
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 35V/µs
- Gain Bandwidth Product:
- 6.4 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 260 µV
- Current - Supply:
- 9mA (x4 Channels)
- Current - Output / Channel:
- 10 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
OPA404KU/1K FAQ
1.How can I place an order for OPA404KU/1K through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA404KU/1K 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 OPA404KU/1K reliable?
The price and inventory of OPA404KU/1K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA404KU/1K is usually 5 days.
3.What payment methods are accepted for OPA404KU/1K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA404KU/1K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA404KU/1K?
OPA404KU/1K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA404KU/1K 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 OPA404KU/1K?
For technical support, including OPA404KU/1K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA404KU/1K requirements.
6.How does Aetrix verify that OPA404KU/1K is sourced from the original manufacturer or authorized distributors?
All OPA404KU/1K 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 OPA404KU/1K meets industry standards.
7.What is the process for return or replacement of OPA404KU/1K?
All OPA404KU/1K units undergo pre-shipment inspection (PSI). If there is an issue with OPA404KU/1K, 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 OPA404KU/1K part is unused and in its original packaging.
Return procedure for OPA404KU/1K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA404KU/1K Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
