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Texas Instruments OPA2541SMQ
- Part No.:
- OPA2541SMQ
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- TO-3-8
- Datasheet:
-
OPA2541SMQ.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT TO3-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,011
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Product details
Overview
OPA2541SMQ from Texas Instruments (formerly Burr-Brown) is a dual high-power operational amplifier in an electrically isolated TO-3 metal can package, delivering ±40V supply operation, 5A continuous output current per channel, FET input stage, and –55°C to +125°C extended temperature range. It serves as a robust power gain block in servo amplifiers, motor drivers, and programmable power supplies where high voltage swing and thermal resilience are critical.
For engineers reviewing the OPA2541SMQ datasheet, OPA2541SMQ pinout, OPA2541SMQ application, or OPA2541SMQ equivalent, this page delivers verified electrical specs, thermal design guidance, SOA-limited output behavior, isolation-enabled heatsink mounting, and real-world use cases including voice coil and resolver excitation circuits - all grounded in the official SBOS157 datasheet and TI packaging addendum.
Technical Context
The OPA2541SMQ integrates two monolithic power op-amps on a single die with electrically isolated case, enabling direct heatsink mounting without thermal insulators. Its FET input provides ultra-low input bias current (15 pA typ), while internal current limiting caps output at ~6A peak under fault conditions.
Thermal performance depends on operating mode: θJC is 0.8°C/W for AC output with both amplifiers active, rising to 1.9°C/W for DC output from one amplifier. The device's safe operating area (SOA) is voltage- and temperature-dependent, with continuous output current derating from 5A at +25°C to 3A at +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | ±10V to ±40V - supports wide-range bipolar rails up to 80V total, enabling high-voltage analog output stages. |
| Continuous Output Current | 5A per channel at +25°C - sufficient to drive low-impedance loads like voice coils or motor windings directly. |
| Input Bias Current | 15 pA typical - enables high-impedance sensor interfacing and precision integrator designs without significant error. |
| Open-Loop Gain | 90 dB at 10 Hz - ensures stable closed-loop gain accuracy in high-fidelity servo and audio applications. |
| Slew Rate | 6 V/µs minimum - supports fast transient response in dynamic load control systems such as motion control. |
| Junction-to-Case Thermal Resistance | 0.8°C/W (AC, both amps) - allows efficient heat transfer to external heatsink, critical for sustained high-power operation. |
| Operating Temperature Range | –40°C to +125°C (case) - qualified for harsh industrial and aerospace environments requiring extended thermal margin. |
Pinout & Package
OPA2541SMQ uses an 8-pin TO-3 (LMF) metal can package with electrically isolated case. The case is internally insulated from all circuitry, permitting direct mechanical attachment to heatsinks without mica or silicone pads - eliminating up to 0.7°C/W of parasitic thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5 | Output A / Output B | High-current output terminals - each capable of sourcing/sinking 5A continuously; require low-inductance PCB traces and Kelvin sensing for stability. |
| 2 | +VS | Positive power supply rail - must be bypassed with low-ESR ceramic/tantalum capacitors placed within 1 cm of pin. |
| 3, 7 | +In A / +In B | Non-inverting inputs - FET-based, high-impedance nodes sensitive to layout-induced leakage; guard rings recommended. |
| 4, 8 | –In A / –In B | Inverting inputs - used for feedback configuration; matched input capacitance (5 pF) ensures balanced AC response across channels. |
| 6 | –VS | Negative power supply rail - shares same bypassing requirements as +VS; ground return path must avoid coupling into input traces. |
Key Features
| Feature | Design Value |
|---|---|
| FET Input Stage | 15 pA input bias current enables precision integration and high-Z sensor buffering without drift or loading errors. |
| Electrically Isolated Case | Eliminates need for thermal insulators - improves thermal conductivity by up to 0.7°C/W and simplifies mechanical mounting. |
| Dual Monolithic Architecture | Two matched amplifiers on one die ensure consistent offset, gain, and thermal tracking - critical for bridge and differential output topologies. |
| Internal Current Limit | ~6A peak protection reduces risk of catastrophic failure during short-circuit transients, though external current sensing is advised for precise control. |
| SOA-Optimized Output Stage | Safe Operating Area curve defines voltage/current boundaries - enables reliable operation into reactive loads like motors and solenoids. |
Applications
| Motor Driver | Servo Amplifier |
|---|---|
Use Scenario: Driving brushed DC or stepper motor windings in industrial automation systems requiring rapid torque response and bidirectional current control. IC Role / Device Role / Timing Role: High-current output stage delivering ±35V swing and 5A peak to motor terminals, configured as a unity-gain current booster with external current-sense feedback. Use Value: Eliminates need for discrete power transistor arrays; integrated SOA protection and thermal monitoring simplify system-level safety compliance. |
Use Scenario: Closed-loop position control in CNC machines using analog feedback from resolvers or encoders. IC Role / Device Role / Timing Role: Precision gain block amplifying low-level resolver sine/cosine signals while maintaining phase integrity and minimizing distortion below 0.01% THD+N. Use Value: FET input preserves signal fidelity over wide temperature range; dual-channel matching ensures consistent loop gain between axes. |
| Voice Coil Driver | Programmable Power Supply |
Use Scenario: Linear actuation in hard disk drive head positioning or vibration testing shakers demanding sub-microsecond settling and low noise. IC Role / Device Role / Timing Role: High-slew-rate output amplifier driving low-inductance voice coil loads (typically <100 mΩ), operated in linear Class-AB mode. Use Value: 6 V/µs slew rate and 2 µs 0.1% settling enable accurate waveform reproduction up to 55 kHz bandwidth. |
Use Scenario: Lab-grade bench power supply with programmable 0–50V output and 5A current limit, controlled via DAC interface. IC Role / Device Role / Timing Role: Precision output buffer amplifying DAC reference voltage, delivering regulated output with minimal load regulation error (<0.01%/A). Use Value: ±40V supply capability and 5A drive allow full-range output without external pass transistors; isolated case simplifies chassis grounding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-power operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2541SM | Identical electrical specs and TO-3 package, but rated for –55°C to +125°C case temperature range. | Preferred for aerospace or military applications requiring full military-grade temp qualification. | Select OPA2541SM when MIL-STD-883 compliance or extended low-temp operation below –40°C is required. |
| LM675T | Single-channel, 4A continuous output, ±35V max supply, TO-220 package, no isolated case. | Lacks dual-channel integration and direct heatsink mounting; requires insulator and thermal pad. | Choose LM675T only for cost-sensitive single-axis systems where dual-channel density and thermal efficiency are not critical. |
Compared with OPA2541SMQ, OPA2541SM offers broader temperature coverage but identical performance and pinout; LM675T trades channel count, thermal advantage, and isolation for lower unit cost and simpler procurement - making it suitable only for non-dual, non-isolated, and non-military applications.
Availability
OPA2541SMQ is available at Aetrix Electronics and suitable for motor driver, servo amplifier, and programmable power supply designs requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial OEM programs.
Supply support for OPA2541SMQ 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-reliability, high-performance signal conditioning components for industrial and aerospace markets.
The OPA2541SMQ belongs to TI's high-power operational amplifier product line, engineered specifically for applications demanding high voltage, high current, and thermally robust analog output stages - including motion control, test equipment, and programmable power systems.
FAQ
What is the maximum continuous output current specification for OPA2541SMQ at +125°C?
The OPA2541SMQ delivers 3A continuous output current per channel at +125°C case temperature, as specified in the "Output Current" table of the SBOS157 datasheet. This reflects thermal derating from the 5A rating at +25°C, and must be validated against the SOA curve for specific voltage and duty-cycle conditions. Always verify junction temperature using θJC = 1.4°C/W (one amp, DC) and ambient thermal design.
Does OPA2541SMQ support single-supply operation?
Yes, the OPA2541SMQ supports single-supply operation as long as the total supply voltage does not exceed 80V - for example, +70V and GND. However, its input common-mode range extends only to (|±VS| – 6V), so level-shifting or biasing is required for true rail-to-rail input operation. The device is optimized for split-supply configurations like ±35V, where full symmetric swing and optimal PSRR are achieved.
Is the case of OPA2541SMQ electrically isolated from internal circuitry?
Yes, the TO-3 metal case of the OPA2541SMQ is fully electrically isolated from all internal circuitry, as confirmed in the "Features" and "Installation Instructions" sections of the SBOS157 datasheet. This allows direct mounting to a grounded heatsink without insulating hardware - improving thermal performance by eliminating ~0.7°C/W of added resistance from mica or silicone pads.
What is the input capacitance of OPA2541SMQ, and how does it affect stability?
The OPA2541SMQ has a specified input capacitance of 5 pF per input terminal, as listed in the "INPUT CHARACTERISTICS" table. This low value minimizes phase shift in high-frequency feedback networks but requires careful PCB layout: keep input traces short, avoid vias near inputs, and use guard rings to prevent stray capacitance from degrading CMRR or causing oscillation - especially when driving capacitive loads above 3.3 nF.
Can OPA2541SMQ be used in parallel for higher output current?
Yes, the OPA2541SMQ supports paralleled operation as documented in Figure 4 of the SBOS157 datasheet, which shows master-slave configuration with 0.1Ω ballast resistors per output. This extends SOA capability and shares current between channels, but requires matched layout, identical feedback networks, and thermal coupling to ensure balanced current sharing - particularly important at elevated temperatures where mismatch increases.
OPA2541SMQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-3-8
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 8V/µs
- Gain Bandwidth Product:
- 1.6 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 15 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 40mA (x2 Channels)
- Current - Output / Channel:
- 7 A
- Voltage - Supply Span (Min):
- 20 V
- Voltage - Supply Span (Max):
- 80 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-3-8
OPA2541SMQ FAQ
1.How can I place an order for OPA2541SMQ through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2541SMQ 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 OPA2541SMQ reliable?
The price and inventory of OPA2541SMQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2541SMQ is usually 5 days.
3.What payment methods are accepted for OPA2541SMQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2541SMQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2541SMQ?
OPA2541SMQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2541SMQ 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 OPA2541SMQ?
For technical support, including OPA2541SMQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2541SMQ requirements.
6.How does Aetrix verify that OPA2541SMQ is sourced from the original manufacturer or authorized distributors?
All OPA2541SMQ 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 OPA2541SMQ meets industry standards.
7.What is the process for return or replacement of OPA2541SMQ?
All OPA2541SMQ units undergo pre-shipment inspection (PSI). If there is an issue with OPA2541SMQ, 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 OPA2541SMQ part is unused and in its original packaging.
Return procedure for OPA2541SMQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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