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Texas Instruments OPA512BM
- Part No.:
- OPA512BM
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- TO-3-8
- Datasheet:
-
OPA512BM.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT TO3-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,051
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Product details
Overview
OPA512BM from Texas Instruments is a high-voltage, very-high-current operational amplifier in an 8-pin TO-3 package, rated for –25°C to +85°C operation. It delivers up to 15A peak output current, supports ±10V to ±50V supplies, and features voltage-current limiting protection. It serves as a power-output stage in servo amplifiers and motor drivers requiring low-distortion class A/B performance.
For engineers reviewing the OPA512BM datasheet, OPA512BM pinout, OPA512BM application, or OPA512BM equivalent, this page provides verified specifications, thermal derating behavior, SOA-limited current delivery, V-I limiter configuration, and direct-mount heat sinking guidance - all critical for high-power analog output stage design.
Technical Context
The OPA512BM uses a laser-trimmed monolithic bias circuit to achieve ±2 mV initial input offset voltage and <±65 µV/°C drift, enabling precision DC-coupled gain stages. Its complementary class A/B output stage eliminates crossover distortion while delivering >96 dB open-loop gain at 8Ω load and 4 MHz gain-bandwidth product.
It integrates user-programmable voltage-current (V-I) limiting via external RCL+ and RCL– resistors (pin 7 and pin 2), with limiter response governed by ILIMIT = (20 + RVI)/(0.65 + RCL + 0.007) + 0.28·VO. The hermetically sealed TO-3 package provides electrical isolation between circuitry and case, enabling direct chassis mounting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±10V to ±50V - supports wide-rail industrial and test equipment power rails without external regulation. |
| Peak Output Current | 15A - drives low-impedance reactive loads such as voice coils and syncro windings directly. |
| Input Offset Voltage (Initial) | ±2 mV - enables accurate DC-coupled servo loop closure without external nulling circuitry. |
| Open-Loop Gain (8Ω) | 96 dB - ensures stable closed-loop gain accuracy under heavy load conditions. |
| Slew Rate | 2.5 V/µs - supports fast transient response in audio and test pin driver applications. |
| Junction-to-Case Thermal Resistance (AC) | 0.8 °C/W - mandates active heat sinking for >25W continuous dissipation at +85°C case temperature. |
| Safe Operating Area (SOA) | Defined up to 15A/100V with secondary breakdown limits - requires explicit SOA compliance checking per application waveform. |
Pinout & Package
OPA512BM is housed in an 8-pin hermetic TO-3 metal package with electrically isolated case, enabling direct mounting to heatsinks or chassis without insulating hardware. Pin numbering follows top-view orientation with pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+In) | Non-inverting input | High-impedance (200 MΩ) differential input node; common-mode range extends to ±(|VS| – 5 V). |
| 2 (RCL+) | Positive current limit sense | Connects to external resistor (RCL+) to set positive output current limit threshold; referenced to –VS. |
| 3 (–In) | Inverting input | Differential input node; used for feedback configuration and gain setting in closed-loop designs. |
| 4 (RVI) | Voltage-current limiter programming | Resistor to ground sets V-I limiter slope; enables dynamic current increase near supply rails to reduce power dissipation. |
| 5 (Output) | Amplifier output | Capable of ±(|VS| – 6 V) swing at 10A; must be decoupled with low-ESR capacitors for stability with reactive loads. |
| 6 (–VS) | Negative supply rail | Power supply return; connects to system negative rail; internal bias circuit referenced to this node. |
| 7 (RCL–) | Negative current limit sense | Connects to external resistor (RCL–) to set negative output current limit threshold; referenced to +VS. |
| 8 (+VS) | Positive supply rail | Power supply input; total |+VS| + |–VS| ≤ 100 V; requires low-inductance, high-current routing. |
Key Features
| Feature | Design Value |
|---|---|
| Class A/B output stage | Eliminates crossover distortion across full output swing, preserving fidelity in audio and precision motion control signals. |
| User-programmable V-I limiter | Prevents SOA violation during short-circuit or inductive kickback by scaling current limit with instantaneous output voltage. |
| Laser-trimmed monolithic bias | Ensures ±2 mV input offset and <±65 µV/°C drift - critical for DC-stable servo and excitation amplifier designs. |
| Hermetic TO-3 package with isolated case | Enables direct thermal coupling to heatsink without insulating washers, reducing thermal resistance by ≥0.5 °C/W vs insulated mounts. |
| Wide supply range (±10V to ±50V) | Supports single-supply or unbalanced configurations up to 90V total, simplifying integration into legacy test and industrial power systems. |
Applications
| Servo Amplifier | Motor Driver |
|---|---|
|
Use Scenario: Closed-loop position control of high-inertia rotary actuators in aerospace test stands. IC Role / Device Role / Timing Role: Final power-output stage delivering 10A peak into 0.5Ω coil impedance with <0.1% harmonic distortion at 1 kHz. Use Value: Class A/B architecture avoids crossover notch, ensuring smooth torque delivery during low-speed reversal and microstepping. |
Use Scenario: Driving brushed DC motors in automated manufacturing conveyors requiring 12A continuous current. IC Role / Device Role / Timing Role: High-current op-amp configured as current-controlled voltage source with programmable ILIM for stall protection. Use Value: RCL+/RCL– resistor programming allows precise current limiting independent of supply voltage, improving motor lifetime. |
| Syncro Excitation | Test Pin Driver |
|
Use Scenario: Generating 26V RMS, 400Hz sinusoidal excitation for aircraft synchro transmitters. IC Role / Device Role / Timing Role: Low-distortion voltage amplifier operating at unity gain with 15A peak capability into reactive load. Use Value: 4 MHz GBW and 2.5 V/µs slew rate maintain phase coherence and amplitude flatness across full 400Hz bandwidth. |
Use Scenario: Driving 50Ω transmission lines in automated test equipment for semiconductor device characterization. IC Role / Device Role / Timing Role: Fast-settling (2 µs to 0.1%) output buffer delivering ±20V pulses with controlled edge rates. Use Value: SOA-limited 15A peak current enables safe driving of shorted or mismatched DUTs without latch-up or second breakdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA512SM | Identical circuit topology but rated for –55°C to +125°C; higher MTTF at elevated temperature due to extended thermal range. | Required for military/aerospace deployments where ambient exceeds +85°C or storage includes –55°C. | Select OPA512SM when full military temperature range and long-term reliability under thermal cycling are mandatory. |
| LM675T | Lower peak current (4A), wider input offset (±10 mV), no V-I limiter; TO-220 package with non-isolated tab. | Suitable only for lower-power servo or audio applications where SOA margin and direct heatsink mounting are not required. | Choose LM675T only for cost-sensitive, non-mission-critical designs with <4A load demand and no need for hermetic sealing or V-I limiting. |
Compared with OPA512SM, the OPA512BM trades extended temperature range for lower cost and qualification overhead; compared with LM675T, it delivers 3.75× higher peak current, integrated V-I limiting, and thermally superior TO-3 packaging - making it essential for demanding industrial motion and test systems.
Availability
OPA512BM is available at Aetrix Electronics and suitable for servo amplifier design, motor driver implementation, and test equipment development requiring stable component supply across extended production cycles.
Supply support for OPA512BM 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 company specializing in analog and embedded processing technologies, with leadership in high-performance amplifiers and precision signal chains.
The OPA512BM belongs to TI's high-current operational amplifier product line, engineered for applications demanding robust power delivery, SOA-aware protection, and direct-mount thermal management in industrial and test environments.
FAQ
What is the maximum safe operating voltage for OPA512BM?
The OPA512BM supports a total supply voltage (|+VS| + |–VS|) up to 100V, with absolute maximum rating of 100V across +VS and –VS pins. For reliable long-term operation, TI recommends limiting total supply to ≤90V under normal conditions. Exceeding 90V increases risk of secondary breakdown, especially at elevated case temperatures. Always verify SOA compliance using the curve in Figure 1 of the OPA512BM datasheet before finalizing supply rails.
How do I configure current limiting on OPA512BM?
Current limiting on OPA512BM is configured using two external resistors: RCL+ (pin 2 to –VS) sets positive current limit, and RCL– (pin 7 to +VS) sets negative current limit. Nominal values follow RCL = 0.65/ILIM – 0.007 Ω. For example, a 10A limit requires ~64.3 mΩ. The optional RVI resistor (pin 4 to ground) enables voltage-dependent current limiting to reduce power dissipation near supply rails.
Can OPA512BM be mounted directly to a heatsink without insulation?
Yes - the OPA512BM's hermetic TO-3 package features full electrical isolation between internal circuitry and the metal case, allowing direct mounting to grounded heatsinks or chassis without mica washers or silicone pads. This reduces thermal resistance by up to 0.5 °C/W versus insulated mounting, improving power handling. Ensure mechanical clamping force meets TI's 20–25 lbf specification to maintain optimal thermal contact.
What is the small-signal bandwidth of OPA512BM at G = 10?
The OPA512BM has a gain-bandwidth product of 4 MHz, yielding a small-signal bandwidth of approximately 400 kHz at closed-loop gain G = 10. Measured under standard conditions (TC = +25°C, VS = ±40V, RL = 8Ω), its –3dB point remains stable across load currents up to 500 mA. Bandwidth decreases slightly at higher output currents due to thermal effects and SOA constraints.
Does OPA512BM include built-in protection against short circuits?
Yes - OPA512BM incorporates dual protection: fixed current limiting via RCL+ and RCL– resistors, and a programmable voltage-current (V-I) limiter via RVI. During a short circuit, the current limit circuit engages first, holding output current at the programmed value. If the short persists, thermal foldback reduces current as case temperature rises, preventing junction overheating. This layered approach avoids latch-up and enables automatic recovery after fault removal.
OPA512BM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-3-8
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 4V/µs
- Gain Bandwidth Product:
- 4 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 12 nA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 25mA
- Current - Output / Channel:
- 10 A
- Voltage - Supply Span (Min):
- 20 V
- Voltage - Supply Span (Max):
- 90 V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-3-8
OPA512BM FAQ
1.How can I place an order for OPA512BM through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA512BM 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 OPA512BM reliable?
The price and inventory of OPA512BM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA512BM is usually 5 days.
3.What payment methods are accepted for OPA512BM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA512BM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA512BM?
OPA512BM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA512BM 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 OPA512BM?
For technical support, including OPA512BM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA512BM requirements.
6.How does Aetrix verify that OPA512BM is sourced from the original manufacturer or authorized distributors?
All OPA512BM 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 OPA512BM meets industry standards.
7.What is the process for return or replacement of OPA512BM?
All OPA512BM units undergo pre-shipment inspection (PSI). If there is an issue with OPA512BM, 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 OPA512BM part is unused and in its original packaging.
Return procedure for OPA512BM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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