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Texas Instruments OPA404KP
- Part No.:
- OPA404KP
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA404KP.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:121
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Product details
Overview
OPA404KP from Texas Instruments (originally Burr-Brown) is a quad high-speed precision Difet® operational amplifier in 14-pin plastic DIP packaging, delivering 6.4MHz gain bandwidth, 35V/µs slew rate, ±750µV max input offset voltage, ±4pA max input bias current, and 0.01% settling in 1.5µs - deployed in precision instrumentation, ultrasound front-ends, and low-noise photodiode amplifiers.
For engineers reviewing the OPA404KP datasheet, OPA404KP pinout, OPA404KP application, or OPA404KP equivalent, this page provides verified specifications, validated pin configuration, real-world use cases in medical and optoelectronic systems, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The OPA404KP uses a dielectrically isolated FET (Difet®) input stage with cascode architecture to simultaneously achieve ultra-low bias current (<±4pA) and high-speed performance (6.4MHz GBW, 35V/µs slew). Its laser-trimmed thin-film resistors ensure ±750µV max offset and ±5µV/°C drift over 0°C to +70°C.
It is unity-gain stable, supports ±15V supply operation, features standard quad op amp pinout (DIP-14), and maintains >125dB channel separation at 100Hz - enabling direct drop-in upgrades in legacy instrumentation designs without layout changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth | 6.4MHz - enables stable closed-loop operation up to ~60kHz at G = +100 without phase margin loss. |
| Slew Rate | 35V/µs - supports full-scale 20Vp-p output transitions in <0.6µs for fast pulse conditioning. |
| Input Offset Voltage | ±750µV max - ensures ≤0.005% error in 10V-range precision measurement circuits. |
| Input Bias Current | ±4pA max - preserves signal integrity in >1GΩ feedback networks and high-impedance sensor interfaces. |
| Settling Time (0.01%) | 1.5µs - meets timing requirements for 16-bit ADC drivers and multiplexed data acquisition systems. |
| Common-Mode Rejection | 84dB min - rejects noise in differential transducer interfaces with ±10V common-mode swing. |
| Supply Voltage Range | ±5V to ±18V - allows flexible rail selection for low-power portable or high-dynamic-range industrial systems. |
Pinout & Package
OPA404KP is housed in a 14-pin plastic dual in-line package (PDIP-N), with 0.300" wide body, through-hole mounting, and industry-standard quad op amp pinout compatible with legacy designs.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output A | Amplifier A output; drives loads ≥2kΩ with ±11.5V swing and ±10mA sourcing/sinking capability. |
| 2 | –In A | Inverting input of Amp A; high-impedance node (10¹³Ω || 1pF) requiring guarding in >100MΩ applications. |
| 3 | +In A | Non-inverting input of Amp A; matched to Pin 2 for optimal CMR and offset cancellation. |
| 4 | +VCC | Positive supply rail; must be decoupled with ≥0.1µF ceramic capacitor near pin for stability. |
| 5 | +In B | Non-inverting input of Amp B; electrically identical to Pin 3, supporting independent dual-channel buffering. |
| 6 | –In B | Inverting input of Amp B; shares same low-bias-current performance as Pin 2 for matched channel operation. |
| 7 | Output B | Amplifier B output; fully independent from Amp A, enabling true quad-channel signal processing. |
| 8 | –VCC | Negative supply rail; symmetrical to Pin 4; absolute max rating ±18VDC. |
| 9 | +In C | Non-inverting input of Amp C; part of monolithic quad die - thermal tracking minimizes inter-channel drift. |
| 10 | –In C | Inverting input of Amp C; referenced to same substrate bias (–VCC) as all inputs for consistent leakage behavior. |
| 11 | Output C | Amplifier C output; capable of driving capacitive loads up to 1000pF in unity-gain configuration. |
| 12 | +In D | Non-inverting input of Amp D; supports simultaneous four-channel low-noise amplification in detector arrays. |
| 13 | –In D | Inverting input of Amp D; exhibits <12fA/√Hz current noise at 1kHz, critical for femtoamp-level measurements. |
| 14 | Output D | Amplifier D output; completes quad functionality with identical AC/DC specs to Pins 1, 7, and 11. |
Key Features
| Feature | Design Value |
|---|---|
| Difet® cascode input stage | Enables <±4pA bias current while sustaining 6.4MHz bandwidth - impossible with conventional BIFET or bipolar inputs. |
| Laser-trimmed thin-film resistors | Delivers ±750µV max offset and ±5µV/°C drift over 0°C to +70°C - best-in-class for quad FET op amps. |
| Standard quad pinout (DIP-14) | Allows direct replacement of LM324, TL084, or OP27-based quad designs without PCB rework. |
| Unity-gain stable operation | Eliminates need for external compensation in G = +1 buffer, inverting, or non-inverting configurations. |
| 125dB channel separation (100Hz) | Prevents crosstalk in multi-channel lock-in amplifiers and time-of-flight ultrasound receivers. |
Applications
| Precision Instrumentation | Optoelectronics |
|---|---|
Use Scenario: High-resolution digital multimeter (DMM) input stage measuring µV-level thermocouple outputs with 100dB CMRR. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier providing gain, offset correction, and low-drift buffering before 24-bit ΣΔ ADC. Use Value: ±750µV max offset and ±5µV/°C drift ensure <0.01% measurement error across 0–70°C ambient range without recalibration. |
Use Scenario: Transimpedance amplifier for UDT PIN-040A photodiode in optical power meter with <1pF parasitic capacitance. IC Role / Device Role / Timing Role: Low-bias-current, low-noise TIA converting photocurrent to voltage with 100kHz bandwidth. Use Value: ±4pA max bias current prevents signal corruption in 1GΩ feedback networks; 15nV/√Hz voltage noise maintains SNR >85dB. |
| Sonar / Ultrasound | Professional Audio Equipment |
Use Scenario: Receive-path amplifier in medical ultrasound beamformer handling weak echo signals after 15MHz transducer. IC Role / Device Role / Timing Role: High-speed, low-noise preamplifier with 1.5µs 0.01% settling for time-gated echo sampling. Use Value: 35V/µs slew rate and 6.4MHz GBW support clean amplification of 5–10MHz RF envelopes without distortion or ringing. |
Use Scenario: Line driver in studio-grade analog audio interface requiring THD+N <0.001% at 1kHz, 6.5Vrms output. IC Role / Device Role / Timing Role: Unity-gain stable output buffer isolating DAC from cable capacitance and load variations. Use Value: 12nV/√Hz input voltage noise at 10kHz and 0.001% THD+N at 20kHz ensure transparent signal reproduction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision quad operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4134UA | Lower bandwidth (8MHz), higher bias current (±10pA), no laser trimming (±1mV offset), SOIC-14 only. | Better suited for audio line drivers than precision DC instrumentation due to higher offset and drift. | Select when cost-sensitive audio applications prioritize low distortion over sub-mV DC accuracy. |
| LMC6084IMX | CMOS input (±20fA bias), lower slew rate (1.5V/µs), narrower GBW (1.3MHz), rail-to-rail output, SOIC-14 only. | Ideal for ultra-high-impedance pH sensors but cannot replace OPA404KP in >100kHz signal chains. | Choose for battery-powered, low-voltage (±2.5V) sensor interfaces where speed is secondary to femtoamp bias current. |
Compared with OPA404KP, OPA4134UA trades laser-trimmed precision for broader audio bandwidth and lower cost, while LMC6084IMX sacrifices speed for ultra-low bias current and rail-to-rail operation - neither matches the OPA404KP's unique combination of 6.4MHz GBW, ±4pA bias, and ±750µV offset in PDIP-14.
Availability
OPA404KP is available at Aetrix Electronics and suitable for precision instrumentation, ultrasound receiver modules, and professional audio equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA404KP 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 its precision analog portfolio, emphasizing high-performance op amps, data converters, and interface ICs for industrial and medical applications.
The OPA404KP belongs to TI's legacy precision Difet® op amp family, engineered specifically for applications demanding simultaneous ultra-low input bias current, high speed, and laser-trimmed DC accuracy - such as detector arrays and sonar front-ends.
FAQ
What is the operating temperature range specified for the OPA404KP?
The OPA404KP is specified for operation from 0°C to +70°C ambient temperature. This range is explicitly stated in the Ordering Information table and confirmed in both the Electrical Specifications and Absolute Maximum Ratings sections of the datasheet. The device's offset drift is rated at ±5µV/°C across this full range, and quiescent current remains stable between 9.3mA and 10.5mA. It is not rated for extended industrial (–40°C to +85°C) or military (–55°C to +125°C) temperatures like the OPA404SG variant.
Does the OPA404KP require external compensation for unity-gain stability?
No, the OPA404KP is internally compensated and unity-gain stable. The datasheet explicitly states "The OPA404 is unity-gain stable" in the DESCRIPTION section and confirms stability with capacitive loads up to 1000pF in unity-gain configuration. This eliminates the need for external compensation networks in G = +1 buffers, inverting amplifiers, or active filters - simplifying design and improving phase margin predictability compared to decompensated op amps like the OPA627.
What is the maximum safe continuous output current for the OPA404KP?
The OPA404KP delivers ±10mA typical output current into RL = 2kΩ at ±10V output swing, with short-circuit current rated at ±27mA (min) and ±40mA (max) under ±10V conditions. The Absolute Maximum Ratings specify continuous short-circuit duration is allowed, provided junction temperature remains below +175°C and internal power dissipation stays within 1000mW - requiring appropriate heatsinking or derating above +70°C ambient.
Can the OPA404KP drive capacitive loads without oscillation?
Yes, the OPA404KP is designed to drive up to 1000pF in unity-gain configuration without requiring external isolation resistance, as confirmed in the "Load Capacitance Stability" specification (1000pF, Gain = +1). For heavier loads (>1000pF) or higher gains, a small series resistor (e.g., 10–50Ω) at the output is recommended to maintain phase margin - consistent with standard FET op amp layout practices outlined in the Applications Information section.
Is the OPA404KP pin-compatible with other quad op amps in PDIP-14 packages?
Yes, the OPA404KP uses the industry-standard quad op amp pinout for 14-pin DIP packages, matching LM324, TL084, and OP274 pin-for-pin. Pins 1–7 and 8–14 follow the identical arrangement: Output A, –In A, +In A, +VCC, +In B, –In B, Output B, –VCC, +In C, –In C, Output C, +In D, –In D, Output D. This enables direct drop-in replacement in existing layouts without trace modifications.
OPA404KP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Difet®
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- 14-PDIP
OPA404KP FAQ
1.How can I place an order for OPA404KP through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA404KP 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 OPA404KP reliable?
The price and inventory of OPA404KP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA404KP is usually 5 days.
3.What payment methods are accepted for OPA404KP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA404KP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA404KP?
OPA404KP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA404KP 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 OPA404KP?
For technical support, including OPA404KP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA404KP requirements.
6.How does Aetrix verify that OPA404KP is sourced from the original manufacturer or authorized distributors?
All OPA404KP 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 OPA404KP meets industry standards.
7.What is the process for return or replacement of OPA404KP?
All OPA404KP units undergo pre-shipment inspection (PSI). If there is an issue with OPA404KP, 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 OPA404KP part is unused and in its original packaging.
Return procedure for OPA404KP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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