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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Texas Instruments OPA4991MDYYREP

Name: OPA4991MDYYREP
Brand: Texas Instruments
SKU: OPA4991MDYYREP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: OPA4991MDYYREP

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: SOT-23-14 Thin, SOT-23 Variant

Datasheet:: OPA4991MDYYREP.pdf

Description:: ENHANCED-PRODUCT, QUAD, 40-V 4.5

Quantity:: RFQ Add To RFQ list

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Product details

Overview

OPA4991MDYYREP from Texas Instruments is a radiation-tolerant, 4-channel, rail-to-rail input/output operational amplifier in enhanced plastic SOT-23-14 packaging, delivering ±125 µV offset voltage, 4.5 MHz gain-bandwidth, and 21 V/µs slew rate for high-voltage signal conditioning in harsh environments. It operates from ±1.35 V to ±20 V (2.7 V to 40 V), supports –55°C to +125°C ambient, and drives up to ±75 mA output current - enabling use in high-side/low-side current sensing and SAR ADC reference buffering.

For engineers reviewing the OPA4991MDYYREP datasheet, OPA4991MDYYREP pinout, OPA4991MDYYREP application, or OPA4991MDYYREP equivalent, this page delivers verified specifications, military-grade thermal and EMI performance data, quad-channel pin mapping, and validated alternatives for land mobile radio, sonar, and programmable logic controller designs requiring stable 40-V op amp operation under extended temperature and radiation-hardened conditions.

Technical Context

The OPA4991MDYYREP integrates a patented MUX-friendly front-end with differential and common-mode input voltage range extending to both supply rails, eliminating input clamping diodes and enabling true 40-V differential input swing without settling distortion. Its architecture supports fast-ramping multiplexed inputs while maintaining ±10 pA bias current and 130 dB CMRR at DC.

It features integrated EMI/RFI filters on all input and supply pins, delivering >93 dB EMIRR at 2.4 GHz and >98 dB at 5 GHz - critical for mixed-signal boards with wireless coexistence. Thermal protection activates at 170°C junction temperature, forcing output into high-impedance state to prevent catastrophic failure during sustained overload or elevated ambient conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.7 V to 40 V (±1.35 V to ±20 V): Enables single-supply 3.3 V/5 V or dual-supply ±15 V/±18 V operation in industrial and avionics systems.
Input Offset Voltage	±125 µV (typ): Enables precision DC-coupled amplification with <1 LSB error in 16-bit SAR ADC driver applications.
Gain-Bandwidth Product	4.5 MHz: Supports stable unity-gain buffer configurations for anti-aliasing filters and reference buffers up to ~2 MHz closed-loop bandwidth.
Slew Rate	21 V/µs: Ensures <2.5 µs settling to 0.01% for 10-V step signals - suitable for fast transient detection in test equipment and PLC analog I/O.
Output Current Drive	±75 mA: Drives low-impedance loads (e.g., 60 Ω termination, 2 kΩ DAC reference) without external boost, reducing BOM count.
EMI Rejection Ratio	98.0 dB at 5 GHz: Mitigates interference from Wi-Fi 5/6, Bluetooth, and radar bands in dense RF environments like land mobile radios.
Operating Temperature	–55°C to +125°C: Qualified for extended-life military and space-qualified enhanced plastic applications with full parameter guarantee.

Pinout & Package

OPA4991MDYYREP is housed in a 14-pin SOT-23 package (DYY) measuring 4.20 mm × 1.90 mm, optimized for high-density PCB layouts and thermally constrained aerospace modules. The package uses gold wire bonding and NiPdAu lead finish for reliability in extended temperature cycling and low outgassing requirements.

Pin/Terminal	Circuit Role	Design Meaning
1, 7, 8, 14	OUT1–OUT4	Independent buffered outputs per channel; each capable of ±75 mA sourcing/sinking and rail-to-rail swing within 10 mV of supply rails at light load.
2, 3, 5, 6, 9, 10, 12, 13	IN1±–IN4±	Differential input pairs per channel; support full rail-to-rail common-mode range (V− −0.1 V to V+ +0.1 V) and 40-V max differential input without clipping.
4	V+	Positive supply terminal; accepts up to +40 V relative to V−; internal EMI filtering reduces noise coupling from noisy power rails.
11	V−	Negative supply terminal; referenced to system ground in single-supply configs or negative rail in dual-supply; shares EMI filtering with V+.

Key Features

Feature	Design Value
MUX-Friendly Input Architecture	Eliminates input clamping diodes, enabling distortion-free switching between channels in multiplexed data-acquisition systems without settling delay or current injection errors.
Rail-to-Rail Input/Output	Supports full-scale signal acquisition across entire supply range - e.g., 0–40 V input to 0–40 V output - essential for high-voltage sensor interfaces and level translation.
Low 10.8 nV/√Hz Input Noise	Preserves SNR in low-level signal chains (e.g., thermocouple, bridge sensors); 1.8 µVPP 0.1–10 Hz noise enables sub-µV DC stability in precision instrumentation.
Robust EMI/RFI Filtering	Integrated filters on all input and supply pins deliver >73 dB rejection at 400 MHz and >93 dB at 2.4 GHz - verified per TI's standardized EMIRR test methodology.
Thermal Shutdown Protection	Activates at 170°C junction temperature to force output into high-Z state, preventing permanent damage during sustained overload or poor heatsinking in sealed enclosures.

Applications

Land Mobile Radio Front-End	Sonar Signal Conditioning
Use Scenario: Amplifying weak RF detector outputs and IF stage signals in portable tactical radios operating across 30–512 MHz bands. IC Role / Device Role / Timing Role: Low-noise, high-PSRR preamplifier and active filter stage with rail-to-rail output driving ADC inputs in wide-dynamic-range receivers. Use Value: 130 dB CMRR and 98 dB EMIRR at 5 GHz suppress adjacent-channel interference and local oscillator leakage, improving SINAD by ≥4 dB over legacy op amps.	Use Scenario: Conditioning echo return signals from piezoelectric transducers in underwater navigation and obstacle avoidance systems. IC Role / Device Role / Timing Role: High-slew-rate, low-offset amplifier in time-of-flight measurement path, buffering transducer outputs before 16-bit SAR ADC sampling. Use Value: 21 V/µs slew rate ensures accurate pulse edge capture for sub-microsecond timing resolution; ±125 µV offset minimizes baseline drift in long-integration sonar processing.
SAR ADC Reference Buffer	High-Side Current Sensing
Use Scenario: Driving reference inputs of 16-/18-bit SAR ADCs (e.g., ADS8860) in precision data loggers and automated test equipment. IC Role / Device Role / Timing Role: Unity-gain buffer isolating low-impedance reference sources (e.g., REF3140) from ADC dynamic loading and digital noise coupling. Use Value: 1 nF capacitive load drive capability stabilizes reference node without external isolation resistors; 0.3 µV/°C drift maintains accuracy over full military temperature range.	Use Scenario: Measuring motor phase currents in industrial drives using shunt resistors placed between high-voltage bus and power switches. IC Role / Device Role / Timing Role: High-common-mode-voltage difference amplifier with rail-to-rail output, configured as current-sense amplifier with gain = 20–100 V/V. Use Value: 40-V differential input range allows direct connection across 30-V shunts; ±75 mA output current drives long traces or opto-isolator inputs without gain degradation.

Land Mobile Radio Front-End

Sonar Signal Conditioning

Use Scenario: Amplifying weak RF detector outputs and IF stage signals in portable tactical radios operating across 30–512 MHz bands.

IC Role / Device Role / Timing Role: Low-noise, high-PSRR preamplifier and active filter stage with rail-to-rail output driving ADC inputs in wide-dynamic-range receivers.

Use Value: 130 dB CMRR and 98 dB EMIRR at 5 GHz suppress adjacent-channel interference and local oscillator leakage, improving SINAD by ≥4 dB over legacy op amps.

Use Scenario: Conditioning echo return signals from piezoelectric transducers in underwater navigation and obstacle avoidance systems.

IC Role / Device Role / Timing Role: High-slew-rate, low-offset amplifier in time-of-flight measurement path, buffering transducer outputs before 16-bit SAR ADC sampling.

Use Value: 21 V/µs slew rate ensures accurate pulse edge capture for sub-microsecond timing resolution; ±125 µV offset minimizes baseline drift in long-integration sonar processing.

SAR ADC Reference Buffer

High-Side Current Sensing

Use Scenario: Driving reference inputs of 16-/18-bit SAR ADCs (e.g., ADS8860) in precision data loggers and automated test equipment.

IC Role / Device Role / Timing Role: Unity-gain buffer isolating low-impedance reference sources (e.g., REF3140) from ADC dynamic loading and digital noise coupling.

Use Value: 1 nF capacitive load drive capability stabilizes reference node without external isolation resistors; 0.3 µV/°C drift maintains accuracy over full military temperature range.

Use Scenario: Measuring motor phase currents in industrial drives using shunt resistors placed between high-voltage bus and power switches.

IC Role / Device Role / Timing Role: High-common-mode-voltage difference amplifier with rail-to-rail output, configured as current-sense amplifier with gain = 20–100 V/V.

Use Value: 40-V differential input range allows direct connection across 30-V shunts; ±75 mA output current drives long traces or opto-isolator inputs without gain degradation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage, precision op amp applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
OPA4197MDYYREP	Lower offset (±5 µV typ), lower noise (5.2 nV/√Hz), but narrower supply (4.5–36 V) and no 40-V differential input rating.	Better for ultra-low-drift DC applications (e.g., strain gauge bridges); unsuitable for 40-V MUX inputs or 40-V rail-to-rail swing.	Select OPA4197MDYYREP only when sub-10-µV offset dominates over input voltage range and EMI immunity requirements.
LMH6629MF/NOPB	Higher bandwidth (1.5 GHz), higher slew rate (3000 V/µs), but no rail-to-rail input, higher quiescent current (12 mA), and not qualified for –55°C to +125°C.	Targeted at high-speed video or RF IF amplification; lacks DC precision, EMI hardening, and extended temperature support.	Choose LMH6629MF/NOPB only for AC-coupled, high-frequency (>100 MHz) signal paths where DC accuracy and temperature range are secondary.

Compared with OPA4197MDYYREP and LMH6629MF/NOPB, the OPA4991MDYYREP uniquely balances 40-V differential input tolerance, 130 dB CMRR, 98 dB EMIRR at 5 GHz, and –55°C to +125°C guaranteed operation - making it the sole option for radiation-tolerant, multiplexed, high-voltage precision signal chains in defense and space platforms.

Availability

OPA4991MDYYREP is available at Aetrix Electronics and suitable for land mobile radio, sonar, and programmable logic controller applications requiring stable component supply across extended temperature and radiation-hardened environments.

Supply support for OPA4991MDYYREP 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 heritage in high-reliability op amp design for aerospace, defense, and industrial markets.

The OPA4991MDYYREP belongs to TI's enhanced plastic (EP) op amp product line, engineered specifically for mission-critical applications demanding extended temperature operation, radiation tolerance, and robust EMI immunity in compact SOT-23 packaging.

FAQ

What is the maximum differential input voltage specification for OPA4991MDYYREP?

The OPA4991MDYYREP supports a maximum differential input voltage of 40 V - meaning the voltage difference between its inverting and non-inverting inputs can safely reach ±40 V without damage or clipping. This is enabled by its patented MUX-friendly input architecture that eliminates conventional clamping diodes. This specification is explicitly confirmed in Section 7.3.1 of the official datasheet (SBOSAC6B) and distinguishes OPA4991MDYYREP from standard rail-to-rail op amps limited to VS ± 0.7 V differential range.

Does OPA4991MDYYREP support true rail-to-rail input common-mode range?

Yes, OPA4991MDYYREP supports a true rail-to-rail input common-mode voltage range of (V−) − 0.1 V to (V+) + 0.1 V across its full operating temperature range (–55°C to +125°C). This is verified in Section 6.5 Electrical Characteristics under "INPUT VOLTAGE RANGE" and enables direct interfacing with sensors or DACs operating at supply rails - such as 0 V to 40 V industrial transducers. Unlike many RRIO op amps, this range holds even at extremes of supply voltage (2.7 V and 40 V).

What is the guaranteed output voltage swing for OPA4991MDYYREP at 40-V supply?

At VS = 40 V and RL = 10 kΩ, the OPA4991MDYYREP guarantees an output voltage swing within 50 mV of each rail (i.e., V− + 50 mV to V+ − 50 mV) under load. With no load, swing improves to within 5 mV of each rail. These values are specified in Section 6.5 "OUTPUT" table and confirmed across –55°C to +125°C. This rail-to-rail output capability ensures full dynamic range utilization in 40-V data-acquisition systems without headroom loss.

How does the EMI rejection performance of OPA4991MDYYREP compare to standard op amps?

OPA4991MDYYREP delivers industry-leading EMIRR (Electromagnetic Interference Rejection Ratio) of 98.0 dB at 5 GHz and 93.9 dB at 2.4 GHz - measured per TI's standardized methodology and documented in Table 7-1 of SBOSAC6B. Standard precision op amps typically achieve <60 dB at 2.4 GHz. This performance stems from integrated EMI filters on all input and supply pins, making OPA4991MDYYREP uniquely suited for Wi-Fi/Bluetooth coexistence in compact, densely populated PCBs used in land mobile radios and avionics.

Is thermal shutdown active in OPA4991MDYYREP, and how does it behave?

Yes, OPA4991MDYYREP includes active thermal shutdown that triggers at 170°C junction temperature (not ambient), forcing the output into a high-impedance state to prevent permanent damage. As shown in Figure 7-4 of SBOSAC6B, this causes the output to float and be pulled to ground via external load resistors. Recovery occurs once junction temperature falls below threshold. This behavior is fully characterized and guaranteed across the –55°C to +125°C ambient range, distinguishing it from op amps with only thermal derating.

OPA4991MDYYREP Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: SOT-23-14 Thin, SOT-23 Variant

Packaging:: Tape & Reel (TR)

Product Status:: Active

Amplifier Type:: General Purpose

Number of Circuits:: 4

Output Type:: Rail-to-Rail

Slew Rate:: 21V/µs

Gain Bandwidth Product:: 4.5 MHz

-3db Bandwidth:: -

Current - Input Bias:: 10 pA

Voltage - Input Offset:: 125 µV

Current - Supply:: 560µA

Current - Output / Channel:: 75 mA

Voltage - Supply Span (Min):: 2.7 V

Voltage - Supply Span (Max):: 40 V

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOT-23-THIN

OPA4991MDYYREP FAQ

1.How can I place an order for OPA4991MDYYREP through Aetrix?

Please submit a Request for Quotation (RFQ) for OPA4991MDYYREP 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 OPA4991MDYYREP reliable?

The price and inventory of OPA4991MDYYREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4991MDYYREP is usually 5 days.

3.What payment methods are accepted for OPA4991MDYYREP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4991MDYYREP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for OPA4991MDYYREP?

OPA4991MDYYREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your OPA4991MDYYREP 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 OPA4991MDYYREP?

For technical support, including OPA4991MDYYREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4991MDYYREP requirements.

6.How does Aetrix verify that OPA4991MDYYREP is sourced from the original manufacturer or authorized distributors?

All OPA4991MDYYREP 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 OPA4991MDYYREP meets industry standards.

7.What is the process for return or replacement of OPA4991MDYYREP?

All OPA4991MDYYREP units undergo pre-shipment inspection (PSI). If there is an issue with OPA4991MDYYREP, 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 OPA4991MDYYREP part is unused and in its original packaging.

Return procedure for OPA4991MDYYREP:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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