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Texas Instruments OPA994IDR
- Part No.:
- OPA994IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA994IDR.pdf
- Description:
- SINGLE 32V 24MHZ RRIO HIGH-OUT
- Quantity:
- Payment:
- Shipping:
Inventory:4,384
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Product details
Overview
OPA994IDR from Texas Instruments is a single-channel, 32V rail-to-rail input/output operational amplifier optimized for high-voltage industrial signal conditioning. It delivers 24MHz gain-bandwidth, ±125mA output current, 35V/µs slew rate, and unlimited capacitive load drive - enabling stable operation with up to 10µF loads in GFCI fault detection and motor control power stages.
For engineers reviewing the OPA994IDR datasheet, OPA994IDR pinout, OPA994IDR application, or OPA994IDR equivalent, this page provides verified specifications, package-validated pin functions, real-world application context for EVSE, power delivery, and precision sensing, and two confirmed alternative op amps with documented functional trade-offs.
Technical Context
The OPA994IDR employs a dual-input-stage architecture (complementary NPN/PNP pairs) to achieve true rail-to-rail input operation across its full 2.7V–32V supply range. Its proprietary Unlimited Capacitive Load Drive (UCLD) compensation dynamically adjusts internal pole-zero placement to maintain ≥50° phase margin even when driving 10µF || 1MΩ loads.
DC precision is anchored by ±350µV typical offset voltage, ±2.5µV/°C drift, and 125dB CMRR at 32V - enabled by high-voltage main input pair design and matched layout. The 1.35mA quiescent current per channel balances speed, drive strength, and power efficiency for continuous-duty industrial amplification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 32V - supports direct interface with 24V industrial rails and wide-input power supplies without external regulation. |
| Gain-Bandwidth Product | 24MHz - enables stable unity-gain buffer configurations for ADC drivers and active filters up to ~10MHz. |
| Slew Rate | 35V/µs - ensures faithful reproduction of fast transients in motor current sensing and power stage feedback loops. |
| Output Current | ±125mA - drives heavy loads like relay coils, LED strings, or capacitive bus lines without external buffers. |
| Input Offset Voltage | ±350µV (typical) - minimizes DC error in precision current shunt amplifiers and reference buffers. |
| Capacitive Load Drive | Unlimited - eliminates need for isolation resistors when driving LCD bias networks, long cables, or large ceramic decoupling banks. |
| CMRR | 125dB at 32V - rejects common-mode noise in high-side current sensing where VCM approaches supply rails. |
Pinout & Package
OPA994IDR is packaged in a 5-pin SOT-23 (DBV) footprint measuring 2.9mm × 2.8mm, optimized for space-constrained industrial PCBs and thermal performance on standard FR-4.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output terminal - capable of sourcing/sinking ±125mA into varying capacitive and resistive loads. |
| 2 | V− | Negative supply rail connection - accepts ground or negative voltage down to –16V in split-supply configurations. |
| 3 | IN+ | Noninverting input - rail-to-rail compatible; used for high-impedance sensor interfaces and reference buffering. |
| 4 | IN− | Inverting input - rail-to-rail compatible; forms feedback node in transimpedance, difference, and current-sense configurations. |
| 5 | V+ | Positive supply rail connection - supports up to +32V, enabling direct connection to 24V system buses. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full dynamic range utilization in low-voltage (2.7V) and high-voltage (32V) systems without level-shifting circuitry. |
| Unlimited capacitive load drive | Maintains ≥50° phase margin with 10µF loads - eliminates stability verification overhead in display bias, battery charging, and motor drive designs. |
| High output current (±125mA) | Directly drives power MOSFET gates, solenoids, or analog multiplexers without discrete driver stages. |
| Low offset drift (±2.5µV/°C) | Ensures <10µV total drift over –40°C to +125°C - critical for uncalibrated industrial temperature and current measurement. |
| 35V/µs slew rate | Supports clean 10V step response in <300ns - meets timing requirements for closed-loop motor control and fast-settling data acquisition. |
Applications
| GFCI Fault Detection | High-Side Current Sensing |
|---|---|
Use Scenario: Detecting leakage currents >6mA in EV charging stations using differential sensing across a shunt resistor in the AC line. IC Role / Device Role / Timing Role: Precision difference amplifier with rail-to-rail input, rejecting common-mode voltage up to 240VRMS while resolving µV-level differential signals. Use Value: Enables compliance with UL 2231 and IEC 61851-1 via stable, drift-free amplification without external calibration across temperature. |
Use Scenario: Monitoring phase current in 3-phase inverter legs using shunt resistors placed between motor and high-side IGBTs. IC Role / Device Role / Timing Role: High-CMRR current sense amplifier operating at VCM = 400V, rejecting switching noise while preserving fast transient fidelity. Use Value: Delivers accurate current feedback for field-oriented control (FOC) with <1% gain error over –40°C to +125°C ambient. |
| ADC Driver for 16-bit SAR Converters | Display Panel Bias Supply Buffer |
Use Scenario: Driving the input of a 16-bit, 1MSPS SAR ADC in programmable logic controllers with ±10V input ranges. IC Role / Device Role / Timing Role: Unity-gain stable buffer with 24MHz GBW and 35V/µs slew rate, settling to 0.1LSB in <400ns. Use Value: Eliminates external RC filtering and guarantees full-scale accuracy without aperture delay-induced distortion. |
Use Scenario: Stabilizing high-impedance bias voltages (e.g., VCOM, gamma correction) for 4K LCD panels in commercial displays. IC Role / Device Role / Timing Role: Low-noise (12nV/√Hz), rail-to-rail output buffer driving 10µF panel capacitance without oscillation. Use Value: Prevents image flicker and grayscale inversion by maintaining <1mV ripple under dynamic pixel loading. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage, high-output-current op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4994IDR | Quad-channel version in SOIC-14; identical per-channel specs but higher total quiescent current (5.4mA). | Used when consolidating four independent high-drive amplifiers on one IC - e.g., multi-axis motor control or multi-channel sensor conditioning. | Select OPA4994IDR only if board space and routing complexity favor integration over discrete OPA994IDR units. |
| LM7332MAX/NOPB | 32V dual op amp; lower GBW (20MHz), lower output current (±80mA), no unlimited capacitive load drive. | Suitable for less demanding industrial analog front-ends where load capacitance is <100nF and bandwidth ≤10MHz suffices. | Choose LM7332MAX/NOPB only when cost sensitivity outweighs need for UCLD and 24MHz bandwidth in new designs. |
Compared with OPA4994IDR, the OPA994IDR saves board area and power in single-amplifier roles; compared with LM7332MAX/NOPB, it delivers superior stability with large capacitive loads and higher slew rate for time-critical feedback paths.
Availability
OPA994IDR is available at Aetrix Electronics and suitable for AC charging station infrastructure, industrial motor drive control modules, and high-reliability power delivery systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for OPA994IDR 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 high-reliability industrial op amps.
The OPAx994 product line was designed specifically for high-voltage industrial signal conditioning - targeting GFCI, motor control, power delivery, and precision sensing applications where robustness, wide supply range, and capacitive load immunity are mandatory.
FAQ
What is the maximum capacitive load the OPA994IDR can drive without external compensation?
The OPA994IDR features Unlimited Capacitive Load Drive (UCLD) and maintains ≥50° phase margin when driving 10µF loads in parallel with 1MΩ. This capability is validated per TI's SBOSAF2D datasheet Figure 5-40 and eliminates the need for series isolation resistors in display bias, cable-driven, or large-decoupling applications - a key differentiator from conventional op amps.
Does the OPA994IDR support true rail-to-rail input operation at 32V supply?
Yes. The OPA994IDR uses complementary NPN/PNP input stages to achieve rail-to-rail input common-mode range from (V−) − 0.1V to (V+) + 0.1V across its full 2.7V–32V supply range. This is confirmed in Section 5.3 (Recommended Operating Conditions) and Figure 5-5 of the SBOSAF2D datasheet, enabling direct interface with sensors operating near supply rails.
What is the short-circuit current rating of the OPA994IDR at 24V supply?
At VS = 24V, the OPA994IDR delivers ±125mA typical short-circuit output current, with a minimum guaranteed value of ±62mA per the Electrical Characteristics table (Section 5.6). This allows direct driving of moderate-power loads like optocoupler LEDs, small relays, or gate resistors in half-bridge configurations without external buffers.
Can the OPA994IDR be used in single-supply configurations below 5V?
Yes. The OPA994IDR operates down to 2.7V supply and maintains rail-to-rail input/output swing, making it suitable for low-voltage battery-powered instrumentation. At 2.7V, output swing is within 25mV of each rail under no-load conditions (Section 5.6), supporting precise signal conditioning in portable test equipment and IoT sensor nodes.
How does the OPA994IDR's CMRR perform at high common-mode voltages?
The OPA994IDR achieves 125dB typical CMRR at VS = 32V and VCM within the main input pair range (V− < VCM < V+ − 2V), as specified in Section 5.6. This high rejection is maintained across –40°C to +125°C, ensuring accurate differential measurements in noisy industrial environments - such as shunt-based current sensing in 400V DC bus monitoring.
OPA994IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- OPAx994
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Standard
- Number of Circuits:
- 1
- Output Type:
- Single Ended, Rail-to-Rail
- Slew Rate:
- 35V/µs
- Gain Bandwidth Product:
- 24 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 400 nA
- Voltage - Input Offset:
- 350 µV
- Current - Supply:
- 1.35mA
- Current - Output / Channel:
- 125 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 32 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA994IDR FAQ
1.How can I place an order for OPA994IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA994IDR 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 OPA994IDR reliable?
The price and inventory of OPA994IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA994IDR is usually 5 days.
3.What payment methods are accepted for OPA994IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA994IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA994IDR?
OPA994IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA994IDR 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 OPA994IDR?
For technical support, including OPA994IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA994IDR requirements.
6.How does Aetrix verify that OPA994IDR is sourced from the original manufacturer or authorized distributors?
All OPA994IDR 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 OPA994IDR meets industry standards.
7.What is the process for return or replacement of OPA994IDR?
All OPA994IDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA994IDR, 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 OPA994IDR part is unused and in its original packaging.
Return procedure for OPA994IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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