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Texas Instruments 3650KG
- Part No.:
- 3650KG
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 32-CDIP (0.900", 22.86mm)
- Datasheet:
-
3650KG.pdf
- Description:
- IC OPAMP ISOLATION 1 CIRC 32CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,073
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Product details
Overview
The 3650KG from Texas Instruments (formerly Burr-Brown) is a precision optically-coupled linear isolation amplifier designed for high-voltage analog signal conditioning across galvanic barriers. It delivers ±10V output, 15kHz bandwidth, 140dB isolation-mode rejection at DC, 0.05% linearity, and supports continuous ±2000V common-mode voltage - enabling accurate current shunt measurement in industrial motor control systems.
For engineers reviewing the 3650KG datasheet, 3650KG pinout, 3650KG application, or 3650KG equivalent, key selection criteria include its verified 1.2V/µs slew rate, ±0.05%/1000hrs gain stability, 25Ω max input resistance, 1.8pF isolation capacitance, and compatibility with ±8V to ±18V dual supplies on both input and output sides.
Technical Context
The 3650KG uses a dual-photodiode optical feedback architecture with laser-trimmed resistor matching to achieve stable transconductance transfer (10⁶ V/A). Its input stage operates as a current-controlled LED driver with negative feedback, while the output stage integrates a matched photodiode and transimpedance amplifier with internal 1MΩ scaling resistor.
Unlike transformer-based isolators, it employs DC analog modulation - eliminating carrier-related EMI susceptibility and enabling true DC-coupled operation. Gain is set externally via RG1/RG2 resistors (for voltage inputs) or directly via input current (for current-source inputs), with no internal oscillator or digital components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 2000V continuous - enables safe operation in grounded industrial equipment with high leakage paths |
| Isolation-Mode Rejection | 140dB at DC - suppresses error from voltage across barrier (e.g., ground potential differences) |
| Gain Linearity Error | ±0.05% max - ensures sub-100ppm accuracy in precision process control loops |
| Bandwidth | 15kHz ±3dB - supports real-time monitoring of fast-changing signals like SCR gate timing or motor armature dynamics |
| Slew Rate | 1.2V/µs typ - prevents distortion during step-response events in closed-loop feedback systems |
| Input Resistance | 25Ω max - minimizes loading on low-impedance sources such as precision shunts |
| Leakage Capacitance | 1.8pF - preserves high-frequency CMRR and reduces capacitive coupling noise in ECG/EMG applications |
Pinout & Package
3650KG is housed in a 32-pin ceramic dual-in-line package (CDIP, drawing JNC), rated for industrial temperature range (–40°C to +85°C), with gold-plated leads and hermetic sealing for long-term reliability in harsh environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 32 | +V / –V Supply Inputs | Input-stage power rails; accept ±8V to ±18V - must be isolated from output supplies |
| 10, 11, 12, 13, 14, 17, 20, 23, 26, 29, 31 | Input Signal & Balance Terminals | +I, –I, Bal, +V, –V define differential current-input interface; BAL pins enable offset nulling |
| 2, 4, 6, 8, 9, 15, 16, 22 | Output Stage Connections | +VCC, –VCC, +VO, –VO, C (output common) - require separate isolated supply domain |
| 3, 5, 7, 18, 19, 21, 24, 25, 27, 28, 30 | No Connect / Guard | Unused pins; recommended to tie to output common or leave floating per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Optical Feedback Matching | Laser-trimmed dual photodiodes ensure <0.05% gain drift over time and temperature |
| DC-Coupled Transfer Function | True analog modulation enables zero-latency, drift-free transmission of DC and low-frequency signals |
| High CMV Immunity | ±2000V continuous common-mode voltage tolerance - eliminates need for external level-shifting circuits |
| Low Leakage Barrier | 0.35µA max leakage at 240V/60Hz and 1.8pF capacitance - critical for biomedical patient isolation compliance |
| Adjustable Gain Architecture | Supports both current-source (G = 10⁶ V/A) and voltage-source (G = V/V) configurations via external RG resistors |
Applications
| Industrial Motor Control | Biomedical Patient Monitoring |
|---|---|
Use Scenario: Measuring armature current and voltage in 480V AC motor drives with shared ground between power and control sections. IC Role / Device Role / Timing Role: Isolates shunt-derived analog signals while preserving phase integrity and DC accuracy for closed-loop torque regulation. Use Value: Enables direct connection to ADC without signal conditioning, maintaining ±0.05% linearity despite >1kV ground-potential differences. | Use Scenario: Front-end amplification in ECG/EMG systems where patient leads are exposed to defibrillation pulses and RF interference. IC Role / Device Role / Timing Role: Acts as isolated instrumentation amplifier with balanced inputs to reject lead-impedance mismatch noise. Use Value: Delivers 140dB isolation-mode rejection and 1.8pF barrier capacitance - meeting IEC 60601-1 creepage/clearance requirements for CF-rated devices. |
| Test Equipment Signal Conditioning | SCR Power Control Feedback |
Use Scenario: High-accuracy voltage/current measurement in automated test equipment interfacing with DUTs operating at different ground potentials. IC Role / Device Role / Timing Role: Provides galvanically isolated analog channel with 15kHz bandwidth for dynamic waveform capture. Use Value: Maintains 1.2V/µs slew rate and <400µs settling to ±0.01%, enabling precise transient analysis without reconstruction artifacts. | Use Scenario: Closed-loop voltage feedback in three-phase bidirectional SCR controllers used in industrial heating systems. IC Role / Device Role / Timing Role: Isolates sensed AC line voltage for firing-angle computation while rejecting commutation noise. Use Value: Achieves 120dB 60Hz isolation-mode rejection under 5kΩ source imbalance - preventing false triggering during zero-cross detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear isolation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AMC1301DWV | Single-ended output, 20MHz bandwidth, integrated ±1V input range, 10kVRMS reinforced isolation | Better suited for modern MCU-based systems requiring digital-ready output and higher bandwidth | Select when replacing legacy designs with space-constrained PCBs and need integrated reference/ADC interface |
| ISO124U | 8-pin SOIC, 50kHz bandwidth, ±13V output, 1500Vrms isolation, no external gain resistors required | Lower cost and smaller footprint but limited to ≤1500V isolation and less stable long-term drift (±0.02%/1000hrs) | Select for non-safety-critical industrial DAQ where size and BOM count outweigh ultra-stability requirements |
Compared with AMC1301DWV and ISO124U, the 3650KG offers superior long-term gain stability (±0.05%/1000hrs vs ±0.02%/1000hrs), higher continuous isolation rating (2000V vs 1500V/10kV RMS), and proven field reliability in medical and motor control systems - justifying its use where calibration interval and safety margin are critical.
Availability
3650KG is available at Aetrix Electronics and suitable for industrial motor control, biomedical instrumentation, test equipment signal conditioning, and SCR power control applications requiring stable component supply across extended product lifecycles.
Supply support for 3650KG 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 deep heritage in precision signal chain solutions.
The 3650KG belongs to TI's legacy Burr-Brown linear isolation amplifier family, engineered specifically for high-fidelity analog signal transmission across hazardous voltage boundaries in safety-critical industrial and medical systems.
FAQ
What is the maximum continuous common-mode voltage specification for the 3650KG?
The 3650KG supports ±2000V continuous common-mode voltage across its isolation barrier, verified per UL 1577 and CSA Component Acceptance Notice 5A. This rating applies under steady-state conditions with proper PCB layout and guarding - enabling direct integration into 600VAC industrial bus monitoring without external attenuation.
Does the 3650KG require external gain-setting resistors for voltage-input operation?
Yes, the 3650KG requires external RG1 and RG2 resistors to configure voltage-input gain - typically split equally (e.g., two 4.99kΩ) to minimize bias-current-induced errors. The gain equation is GV1 = VOUT / (V+ − V−) = 1 + (RG1 + RG2)/RIN, with RIN ≤ 25Ω. Current-input mode bypasses RG resistors entirely.
What is the guaranteed minimum output drive capability of the 3650KG?
The 3650KG guarantees ±5mA output current into loads while maintaining ±10V swing, tested across temperature (0°C to +85°C) and supply variations (±8V to ±18V). This supports direct driving of 2kΩ instrumentation inputs or RC filters without buffer amplifiers - confirmed in Figure 4 typical performance curves.
Can the 3650KG be used in patient-connected biomedical applications?
Yes, the 3650KG meets essential isolation safety requirements for CF-rated patient monitoring: 1.8pF barrier capacitance limits leakage current to <0.35µA at 240V/60Hz, and its 2000V continuous isolation exceeds IEC 60601-1 Clause 8.8.3 requirements for applied parts. Layout adherence to guarding guidelines (Section 10) is mandatory.
What is the temperature coefficient of gain for the 3650KG across its full operating range?
The 3650KG exhibits 50ppm/°C gain drift (±0.005%/°C) over 0°C to +85°C - specified in the "Gain vs Temperature" row for 3650KG in the datasheet's Specifications table. This stability is achieved via matched photodiode optics and laser-trimmed feedback networks, making it suitable for unattended calibration-critical systems.
3650KG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-CDIP (0.900", 22.86mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Isolation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1.2V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 15 kHz
- Current - Input Bias:
- 10 nA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 2.3mA
- Current - Output / Channel:
- 5 mA
- Voltage - Supply Span (Min):
- 16 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-CDIP
3650KG FAQ
1.How can I place an order for 3650KG through Aetrix?
Please submit a Request for Quotation (RFQ) for 3650KG 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 3650KG reliable?
The price and inventory of 3650KG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3650KG is usually 5 days.
3.What payment methods are accepted for 3650KG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3650KG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3650KG?
3650KG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3650KG 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 3650KG?
For technical support, including 3650KG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3650KG requirements.
6.How does Aetrix verify that 3650KG is sourced from the original manufacturer or authorized distributors?
All 3650KG 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 3650KG meets industry standards.
7.What is the process for return or replacement of 3650KG?
All 3650KG units undergo pre-shipment inspection (PSI). If there is an issue with 3650KG, 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 3650KG part is unused and in its original packaging.
Return procedure for 3650KG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3650KG Tags
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