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Texas Instruments OPA404SG
- Part No.:
- OPA404SG
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-CDIP (0.300", 7.62mm)
- Datasheet:
-
OPA404SG.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,077
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Product details
Overview
OPA404SG from Texas Instruments (originally Burr-Brown) is a quad high-speed precision dielectrically isolated FET (Difet®) operational amplifier designed for ultra-low-input-bias-current signal conditioning in demanding 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 time to 0.01% - enabling high-fidelity amplification in sonar receivers and medical detector arrays.
For engineers reviewing the OPA404SG datasheet, OPA404SG pinout, OPA404SG application, or OPA404SG equivalent, this page provides verified specifications, ceramic DIP-14 package details, quad-channel pin mapping, laser-trimmed precision performance context, and validated alternative options for extended-temperature instrumentation designs.
Technical Context
The OPA404SG employs a cascode input stage architecture that decouples gate-to-drain voltage dependence, preserving sub-picoampere bias current across its full ±10.5 V common-mode input range. Its monolithic Difet® process achieves superior noise, drift, and speed versus legacy BIFET® amplifiers.
Laser trimming of thin-film resistors ensures ±260 µV typical input offset voltage and ±3 µV/°C average drift over –55°C to +125°C, while unity-gain stability and 1000 pF load capacitance tolerance support robust feedback design without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth | 6.4 MHz at G = 100 - supports stable closed-loop operation up to ~64 kHz at unity gain with minimal phase margin loss. |
| Slew Rate | 35 V/µs - enables accurate reproduction of fast-rising signals such as ultrasound pulses or transient detector outputs. |
| Input Bias Current | ±4 pA max at 25°C - critical for guarding high-impedance sources like photodiodes or piezoelectric sensors without loading error. |
| Input Offset Voltage | ±750 µV max - laser-trimmed for low DC error in precision integrators and auto-zero circuits without external nulling. |
| Settling Time | 1.5 µs to 0.01% - ensures rapid stabilization after multiplexer switching or step inputs in data acquisition systems. |
| Operating Temp Range | –55°C to +125°C - qualified for aerospace, downhole, and military-grade embedded systems requiring extended thermal reliability. |
| Supply Voltage | ±5 V to ±18 V - accommodates both low-power portable instrumentation and high-dynamic-range industrial signal chains. |
Pinout & Package
OPA404SG is housed in a 14-pin ceramic dual in-line package (CDIP), offering hermetic sealing and enhanced thermal stability for harsh-environment deployment. The package conforms to JEDEC standard JD outline with 0.300-inch body width and 0.100-inch lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output A | Amplifier A output - drives external loads up to ±11.5 V into 2 kΩ with ±10 mA sourcing/sinking capability. |
| 2 | –In A | Inverting input A - high-impedance node (10¹³ Ω || 1 pF) sensitive to PCB leakage; requires guard ring routing. |
| 3 | +In A | Non-inverting input A - matched impedance to Pin 2; used for differential sensing or reference buffering. |
| 4 | +VCC | Positive supply rail - accepts ±5 V to ±18 V; decoupling capacitor required within 1 cm for stability. |
| 5 | +In B | Non-inverting input B - electrically isolated from other channels; supports independent sensor interface per amplifier. |
| 6 | –In B | Inverting input B - identical bias current and noise performance as Pin 2; shares same substrate isolation. |
| 7 | Output B | Amplifier B output - fully independent channel with same AC/DC specs as Output A. |
| 8 | Output D | Amplifier D output - fourth channel output; pin-compatible with industry-standard quad op amp layouts. |
| 9 | –In D | Inverting input D - maintains <±4 pA bias current across full temperature range; critical for long-term calibration stability. |
| 10 | +In D | Non-inverting input D - referenced to same high-impedance node structure as Pins 2/3/5/6. |
| 11 | –VCC | Negative supply rail - must be connected even in single-supply configurations using virtual ground. |
| 12 | +In C | Non-inverting input C - enables simultaneous multi-channel signal conditioning without crosstalk degradation. |
| 13 | –In C | Inverting input C - benefits from cascode design immunity to common-mode voltage-induced bias current drift. |
| 14 | Output C | Amplifier C output - completes quad configuration; supports synchronized sampling or parallel filter banks. |
Key Features
| Feature | Design Value |
|---|---|
| Difet® input architecture | Dielectric isolation eliminates latch-up risk and enables ±36 V differential input rating with no input protection diodes needed. |
| Laser-trimmed thin-film resistors | Delivers ±260 µV typical offset and ±3 µV/°C drift - best-in-class for quad FET op amps over military temperature range. |
| Cascode input stage | Maintains ±4 pA max bias current independent of common-mode voltage - unlike BIFET® amplifiers whose bias current doubles above ±5 V CM. |
| Unity-gain stable | Operates reliably with gain ≥ 1 without external compensation; supports direct use in buffers, followers, and active filters. |
| 1000 pF capacitive load drive | Stable into heavy capacitive loads (e.g., coaxial cables, ADC input capacitance) without oscillation or peaking. |
Applications
| Precision Instrumentation | Optoelectronics |
|---|---|
Use Scenario: High-resolution digital multimeter front-end measuring nanoamp-level leakage currents in semiconductor test fixtures. IC Role / Device Role / Timing Role: Ultra-low-bias-current transimpedance amplifier converting photodiode or picoammeter current to voltage with minimal input loading. Use Value: ±4 pA max bias current prevents measurement error in sub-nA ranges; 1.5 µs settling enables 100 kSPS sampling without droop-induced offset. |
Use Scenario: Low-noise amplification of weak optical signals from avalanche photodiodes in fiber-optic receivers. IC Role / Device Role / Timing Role: First-stage preamplifier in transimpedance configuration, preserving signal integrity before digitization. Use Value: 15 nV/√Hz input voltage noise at 1 kHz and 0.6 fA/√Hz current noise minimize SNR degradation in photon-starved conditions. |
| Sonar/Ultrasound | Medical Equipment |
Use Scenario: Signal conditioning of echo return pulses in underwater sonar transducers operating at 50–500 kHz. IC Role / Device Role / Timing Role: High-slew-rate amplifier in receive-path gain stages, handling fast-rising pulse envelopes with minimal distortion. Use Value: 35 V/µs slew rate reproduces 10-Vpp pulses with <0.1% overshoot; 6.4 MHz bandwidth preserves pulse fidelity up to 5th harmonic. |
Use Scenario: Front-end amplification of EEG/ECG biopotential signals in portable patient monitors requiring battery longevity and EMI resilience. IC Role / Device Role / Timing Role: Precision instrumentation amplifier input stage rejecting common-mode interference while amplifying microvolt-level neural activity. Use Value: 92 dB min CMRR at DC and 88 dB at ±10 V CM ensures >80 dB interference rejection; –55°C to +125°C rating supports sterilization cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision, low-bias-current operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4141AMDBV | Single-supply capable (2.7–36 V), lower 11 MHz GBW, ±20 pA bias current, SOIC-14 package only. | Not rated for –55°C operation; unsuitable for aerospace or downhole deployments requiring extended temperature qualification. | Select when cost-sensitive commercial instrumentation needs rail-to-rail output but does not require military temp range or sub-5 pA bias current. |
| ADA4625-2ARZ | Dual-channel, 18 MHz GBW, ±0.3 pA bias current, 3.8 nV/√Hz noise, SOIC-8 package, ±15 V max supply. | Lacks quad configuration; requires two devices to match OPA404SG channel count; no CDIP packaging option available. | Choose for highest-precision dual-channel applications where ultra-low bias current outweighs need for four integrated amplifiers or hermetic packaging. |
Compared with OPA404SG, OPA4141AMDBV trades extended temperature capability and femtoamp-level bias current for lower cost and single-supply flexibility, while ADA4625-2ARZ delivers superior bias current and noise but requires doubling component count and forfeits ceramic DIP ruggedness.
Availability
OPA404SG is available at Aetrix Electronics and suitable for precision instrumentation, sonar signal processing, and medical diagnostic equipment requiring stable component supply across extreme temperature environments.
Supply support for OPA404SG 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 Corporation in 2000 and maintains legacy high-precision analog product lines including the OPA family. TI is a global leader in analog semiconductors with over 50 years of op amp innovation.
The OPA404SG belongs to TI's precision Difet® operational amplifier product line, engineered specifically for applications demanding ultra-low input bias current, wide bandwidth, and operation across military-grade temperature ranges.
FAQ
What is the maximum operating temperature range for the OPA404SG?
The OPA404SG is specified for operation from –55°C to +125°C ambient temperature, making it suitable for aerospace, defense, and oilfield applications where thermal extremes are routine. This extended range is enabled by its ceramic DIP package and Difet® process, distinguishing it from commercial-grade variants like OPA404KP (0°C to +70°C). The OPA404SG maintains ±4 pA max input bias current and ±750 µV max offset voltage across this full range.
Does the OPA404SG require external input protection circuitry?
No, the OPA404SG does not require external input protection diodes under normal operation. Its Difet® architecture eliminates forward-biased gate-to-substrate diodes found in conventional BIFET® amplifiers. Input current limiting resistors are only needed if input voltage exceeds –VCC – 8 V (e.g., more than 8 V negative relative to –VCC). A 10 kΩ series resistor suffices for ±15 V supply loss scenarios, per Absolute Maximum Ratings guidance.
Can the OPA404SG drive capacitive loads without instability?
Yes, the OPA404SG is stable driving up to 1000 pF capacitive loads in unity-gain configuration, as confirmed in the Electrical Specifications table. This capability allows direct interfacing with ADC input capacitance, coaxial cables, or long PCB traces without requiring isolation resistors or external compensation networks - a key advantage over many general-purpose op amps that oscillate beyond 100 pF.
How does the OPA404SG's cascode input stage improve performance over standard FET op amps?
The OPA404SG's cascode input stage isolates the input FET gate from drain voltage variations, eliminating the common-mode voltage dependence seen in BIFET® amplifiers. As shown in Figure 4 of the datasheet, bias current remains flat at ±4 pA across ±10 V common-mode range, whereas competitors like LF156 show >10× increase above ±5 V. This ensures consistent DC accuracy and low-frequency drift in varying input common-mode conditions.
Is the OPA404SG pin-compatible with standard quad op amp footprints?
Yes, the OPA404SG uses the industry-standard 14-pin DIP pinout for quad operational amplifiers, matching pin assignments for devices such as LM324, TL084, and OP274. Pin 1 is Output A, Pins 2/3 are Inverting/Non-inverting Input A, Pin 4 is +VCC, Pins 5/6 are Input B, Pin 7 is Output B, Pin 8 is Output D, Pins 9/10 are Input D, Pin 11 is –VCC, Pins 12/13 are Input C, and Pin 14 is Output C - enabling drop-in upgrades in existing designs.
OPA404SG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Difet®
- Package/Case:
- 14-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Not For New Designs
- 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:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-CDIP
OPA404SG FAQ
1.How can I place an order for OPA404SG through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA404SG 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 OPA404SG reliable?
The price and inventory of OPA404SG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA404SG is usually 5 days.
3.What payment methods are accepted for OPA404SG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA404SG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA404SG?
OPA404SG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA404SG 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 OPA404SG?
For technical support, including OPA404SG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA404SG requirements.
6.How does Aetrix verify that OPA404SG is sourced from the original manufacturer or authorized distributors?
All OPA404SG 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 OPA404SG meets industry standards.
7.What is the process for return or replacement of OPA404SG?
All OPA404SG units undergo pre-shipment inspection (PSI). If there is an issue with OPA404SG, 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 OPA404SG part is unused and in its original packaging.
Return procedure for OPA404SG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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