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Texas Instruments OPA2541BM
- Part No.:
- OPA2541BM
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- TO-3-8
- Datasheet:
-
OPA2541BM.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT TO3-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,944
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Product details
Overview
OPA2541BM from Texas Instruments (formerly Burr-Brown) is a dual high-power operational amplifier in an electrically isolated TO-3 metal can package, delivering ±5A continuous output current with ±40V supply capability and FET-input architecture. It operates over –25°C to +85°C case temperature, features 90 dB open-loop gain at 10 Hz, and supports motor driver, servo amplifier, and programmable power supply applications.
For engineers reviewing the OPA2541BM datasheet, OPA2541BM pinout, OPA2541BM application, or OPA2541BM equivalent, this page provides verified specifications, thermal design guidance for heat-sink mounting, SOA-limited output current vs. temperature behavior, and validated alternatives for high-current linear amplification where electrical isolation and ±40V operation are required.
Technical Context
The OPA2541BM integrates two monolithic power op-amps on a single die with electrically isolated metal case-enabling direct mounting to heatsinks without thermal insulators. Its FET input stage delivers ultra-low input bias current (15 pA typ) and high input impedance (>1 TΩ), while internal current limiting caps output at ~6A peak.
Thermal performance is defined by junction-to-case resistance (θJC = 0.8–1.9 °C/W depending on AC/DC and single/dual amplifier operation), and safe operating area (SOA) is voltage- and temperature-dependent-e.g., ±5A continuous at +25°C but derated to ±3A at +125°C for SM-grade variants (not applicable to BM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±10 V to ±40 V - supports wide-range industrial power rails without external regulation |
| Continuous Output Current | ±5 A at +25°C - enables direct drive of low-impedance loads like voice coils and motor windings |
| Input Offset Voltage | ±0.25 mV (typ) - ensures precision DC gain accuracy in closed-loop servo and regulator circuits |
| Open-Loop Gain (10 Hz) | 90 dB (min) - provides stable loop gain margin for high-fidelity feedback control up to ~1.6 MHz GBW |
| Slew Rate | 6 V/µs (min) - supports fast transient response in audio and motion control waveforms |
| Input Bias Current | 15 pA (typ) - minimizes voltage error across high-value feedback networks |
| Thermal Resistance θJC | 0.8 °C/W (both amps, AC output) - allows efficient heat transfer to external heatsink without insulator penalty |
Pinout & Package
OPA2541BM uses an 8-pin TO-3 (LMF) metal-can package with electrically isolated case-designed for direct bolt-down heatsinking. Pin numbering follows standard top-view orientation with pins 1–4 on left row and 5–8 on right row.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5 | OutA / OutB | Amplifier A and B output terminals-capable of ±5A sourcing/sinking into resistive or reactive loads |
| 2 | +VS | Positive power supply rail connection for both amplifiers-rated up to +40V |
| 3, 7 | +InA / +InB | Non-inverting inputs-FET-based, 15 pA bias current, >1 TΩ input impedance |
| 4, 8 | –InA / –InB | Inverting inputs-matched to non-inverting inputs for precision differential operation |
| 6 | –VS | Negative power supply rail connection for both amplifiers-rated down to –40V |
Key Features
| Feature | Design Value |
|---|---|
| Electrically isolated TO-3 case | Enables direct mechanical and thermal attachment to heatsink without mica or silicone pads-eliminates ~0.7 °C/W thermal penalty |
| FET input stage | 15 pA typical input bias current ensures minimal offset drift in high-impedance sensor interfaces and precision integrators |
| Dual-monolithic architecture | Two matched high-power amplifiers share thermal substrate-reduces board space and inter-channel thermal crosstalk vs. discrete solutions |
| Internal current limiting | Clamps output near ±6A peak-provides basic fault protection during overload, though external SOA management remains essential |
| Wide temperature range (BM) | Rated for –25°C to +85°C case operation-validated for industrial motor drives and programmable supplies under ambient thermal stress |
Applications
| Motor Driver | Servo Amplifier |
|---|---|
Use Scenario: Driving brushed DC motors in industrial automation systems requiring bidirectional torque and speed control. IC Role / Device Role / Timing Role: Dual-channel power op-amp configured as H-bridge driver or current-mode controller for precise winding current regulation. Use Value: ±5A output sustains stall currents; ±40V supply accommodates 70V bus systems; isolated TO-3 simplifies thermal management in compact enclosures. |
Use Scenario: Closed-loop position control in CNC machines using analog feedback from resolvers or LVDTs. IC Role / Device Role / Timing Role: High-slew, low-drift amplifier conditioning resolver excitation signals and demodulating error voltages. Use Value: 6 V/µs slew rate supports fast error correction; <±0.25 mV offset ensures sub-arcminute positioning accuracy; FET input avoids loading high-Z resolver windings. |
| Voice Coil Driver | Programmable Power Supply |
Use Scenario: Precision actuation in semiconductor wafer steppers and optical alignment stages. IC Role / Device Role / Timing Role: Linear current source driving low-inductance voice coils with minimal phase lag and distortion. Use Value: 90 dB open-loop gain maintains tight current regulation; SOA curve validated for reactive loads; 5A capability covers full stroke acceleration demands. |
Use Scenario: Lab-grade bench power supplies with remote sensing and programmable voltage/current limits. IC Role / Device Role / Timing Role: Pass element driver in series-regulated topology, translating DAC output into high-current, low-noise output voltage. Use Value: ±40V supply headroom enables 0–70V output range; quiescent current (40 mA typ) balances efficiency and stability; TO-3 isolation prevents ground-loop noise coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-power operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2541SM | Same TO-3 package and pinout; extended temperature range (–55°C to +125°C); higher cost and longer lead time | Required for aerospace, defense, or extended-temperature industrial environments where BM grade fails qualification | Select OPA2541SM only when operation beyond +85°C case temperature is mandatory-BM offers identical electrical specs at lower cost for commercial/industrial use. |
| LM12CL | Single-channel, 13A capable, TO-3 package; no FET input (bipolar, ~100 nA IB); different pinout and gain structure | Used in ultra-high-current single-axis drivers; lacks dual-channel integration and low-input-bias advantage of OPA2541BM | Choose LM12CL only when single-amplifier 13A output is needed and dual-channel density is unnecessary-OPA2541BM provides better channel matching and thermal symmetry for multi-axis systems. |
Compared with OPA2541SM, the OPA2541BM trades military-grade temperature range for lower cost and faster availability, while retaining identical electrical performance at industrial temperatures; compared with LM12CL, it delivers dual-channel functional density and FET-input precision-but at lower peak current and different pin compatibility.
Availability
OPA2541BM is available at Aetrix Electronics and suitable for motor driver, servo amplifier, and programmable power supply applications requiring stable component supply, long-term industrial lifecycle support, and traceable sourcing from authorized channels.
Supply support for OPA2541BM 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-including legacy high-power op-amps like the OPA2541 series-with full datasheet, application note, and reliability documentation.
The OPA2541BM belongs to TI's high-voltage, high-current operational amplifier product line-designed specifically for linear power amplification in industrial motion control, test equipment, and programmable power systems where thermal efficiency and electrical isolation are critical.
FAQ
What is the maximum continuous output current specification for OPA2541BM at +25°C?
The OPA2541BM is specified for ±5A continuous output current at +25°C case temperature. This rating assumes proper heatsinking and operation within the Safe Operating Area (SOA) curve-derating to ±4A at +85°C and not rated above that temperature. The internal current limit activates near ±6A peak but is not intended as primary short-circuit protection.
Does OPA2541BM require insulating hardware when mounted to a heatsink?
No, the OPA2541BM does not require insulating hardware when mounted to a heatsink. Its TO-3 metal case is electrically isolated from all internal circuitry, enabling direct bolt-down installation. This eliminates thermal interface resistance from mica or silicone pads-improving thermal performance by ~0.7 °C/W versus insulated mounting methods.
What is the input stage technology used in OPA2541BM, and how does it affect system design?
The OPA2541BM uses a FET input stage, resulting in ultra-low input bias current (15 pA typ) and high DC input impedance (>1 TΩ). This enables use with high-value feedback resistors without significant offset error, supports precision integrator and sensor signal conditioning circuits, and reduces thermal EMF errors common in bipolar-input amplifiers at elevated temperatures.
Can OPA2541BM operate from a single supply, and what are the constraints?
Yes, OPA2541BM can operate from a single supply as long as the total voltage across +VS and –VS does not exceed 80V (e.g., +80V and GND). However, its input common-mode range extends only to ±(|VS| – 6V), and output swing is limited to ±(|VS| – 4.5V) at 2A load-so single-supply designs must carefully manage headroom and reference biasing to avoid clipping or saturation.
How does the thermal resistance θJC vary between single- and dual-amplifier operation in OPA2541BM?
In OPA2541BM, θJC is 0.8 °C/W for both amplifiers operating with AC output (best-case thermal distribution), but rises to 1.4 °C/W for a single amplifier under DC output (worst-case localized heating). This variation directly impacts heatsink sizing-designers must use the appropriate θJC value based on actual load profile and channel utilization to ensure junction temperature stays below +150°C.
OPA2541BM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-3-8
- Packaging:
- Tube
- 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:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-3-8
OPA2541BM FAQ
1.How can I place an order for OPA2541BM through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2541BM 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 OPA2541BM reliable?
The price and inventory of OPA2541BM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2541BM is usually 5 days.
3.What payment methods are accepted for OPA2541BM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2541BM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2541BM?
OPA2541BM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2541BM 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 OPA2541BM?
For technical support, including OPA2541BM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2541BM requirements.
6.How does Aetrix verify that OPA2541BM is sourced from the original manufacturer or authorized distributors?
All OPA2541BM 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 OPA2541BM meets industry standards.
7.What is the process for return or replacement of OPA2541BM?
All OPA2541BM units undergo pre-shipment inspection (PSI). If there is an issue with OPA2541BM, 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 OPA2541BM part is unused and in its original packaging.
Return procedure for OPA2541BM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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