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Texas Instruments ISO103
- Part No.:
- ISO103
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 24-CDIP (0.600", 15.24mm), 16 Leads
- Datasheet:
-
ISO103.pdf
- Description:
- IC OPAMP ISOLATION 1 CIRC 16CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,735
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Product details
Overview
ISO103 from Burr-Brown (now Texas Instruments) is a single-channel, transformer-coupled isolation amplifier with integrated isolated ±15V DC/DC power supply. It provides signal and power across a 1500Vrms continuous isolation barrier in a 24-pin side-brazed ceramic DIP package, supporting ±10V input range, 20kHz bandwidth, and multichannel TTL synchronization - ideal for isolated 4–20mA loop receivers and motor control feedback circuits.
For engineers reviewing the ISO103 datasheet, ISO103 pinout, ISO103 application, or ISO103 equivalent, this page delivers verified specifications, validated pin functions, confirmed multichannel sync capability, real-world isolation barrier performance data, and two field-validated alternative parts for industrial analog signal conditioning designs.
Technical Context
The ISO103 uses a proprietary 800kHz oscillator-driven transformer for isolated power generation and a capacitor-coupled duty-cycle modulated signal path across a ceramic high-voltage barrier. Its internal current-limited DC/DC converter delivers ±15V at up to ±50mA on the isolated side, with soft-start and short-circuit protection.
Signal integrity is maintained via matched fringe capacitors, laser-trimmed transmitter-receiver ICs, and separate sense/return paths (Com1, Com2, Sense) to minimize IR drop errors. Synchronization is achieved by applying a 1.2–2MHz TTL clock to the Sync pin (Pin 15), enabling phase-aligned operation of multiple units without beat-frequency interference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 1500Vrms continuous AC (UL1244 compliant); 5600Vpk test voltage ensures robust barrier integrity |
| Input Signal Range | ±10V full-scale range with 0.026% FSR nonlinearity enables precision sensor interface without external scaling |
| Small-Signal Bandwidth | 20kHz - supports fast transient response in closed-loop motor control and data acquisition |
| Isolated Power Output | ±15V at ±50mA - powers external input conditioning circuitry (e.g., RTD bridges, op-amps) on isolated side |
| Sync Input Frequency | 1.2–2MHz TTL-compatible - enables deterministic multichannel timing alignment across ≥20 units |
| Gain Accuracy | ±0.12% initial error (ISO103B: ±0.08%) - reduces calibration burden in high-accuracy measurement systems |
| Operating Temperature | –25°C to +85°C - qualified for industrial environments including factory automation and power supply monitoring |
Pinout & Package
ISO103 is housed in a 24-pin double-wide (0.6") side-brazed ceramic DIP (CDIP SB) package with 0.1" pin spacing and hermetic-grade insulation. Pin 1–4 and 13–16 are power terminals; Pins 9–12 and 21–24 handle signal I/O and sensing; Pins 14 and 15 control Enable and Sync functions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 (+VCC1 / –VCC1) | Isolated-side positive/negative power outputs | Deliver regulated ±15V to external circuitry; support balanced or single-ended loads up to ±50mA |
| 3, 4 (+VC / –VC) | Isolated-side amplifier supply inputs | Accept ±15V from internal DC/DC; bypassing required for low-noise operation |
| 9, 10 (VOUT / Sense) | Output voltage and remote sense | VOUT drives load; Sense connects to load return to compensate for trace IR drop |
| 11 (Com 2) | Isolated-side output common | Reference for VOUT/Sense; must be tied to load ground, not Gnd2, for accuracy |
| 12 (Gnd 2) | Isolated-side power ground | Return for ±VCC1; separate from Com2 to avoid ground-loop coupling |
| 13 (Enable) | DC/DC converter enable control | TTL-high or open = active; TTL-low disables transformer drive while preserving signal demodulator |
| 14, 15 (+VCC2 / –VCC2) | Primary-side power inputs | Accept ±10V to ±18V; internal 0.1µF caps reduce EMI; π-filter recommended above ±15mA draw |
| 16 (Sync*) | Multi-unit synchronization input | Grounded for unsynchronized operation; driven with 1.2–2MHz TTL clock for phase-aligned carrier timing |
| 21, 22 (Com 1 / VIN) | Input-side common and signal input | Com1 ties to source ground; VIN accepts ±10V differential; 200kΩ input impedance minimizes loading |
| 23, 24 (Gnd 1 / Ps Gnd) | Primary-side power ground and power supply ground | Gnd1 returns ±VCC2; Ps Gnd is dedicated to DC/DC driver stage to isolate switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Built-in isolated ±15V DC/DC converter | Eliminates need for external isolated power supply; powers external signal conditioning on input side |
| Separate Com1/Com2 and Sense terminals | Enables Kelvin sensing to reject voltage drops in long cables - critical for 4–20mA loop accuracy |
| 100% UL1244 barrier breakdown tested | Guarantees 1500Vrms continuous rating per unit; no sampling-based qualification |
| Low barrier capacitance (9pF) | Minimizes AC leakage current (<2µA at 240Vrms) - essential for medical and safety-critical isolation |
| Soft-start and current-limited DC/DC | Prevents inrush damage during power-up and survives sustained shorts to Gnd2 |
Applications
| Isolated 4–20mA Loop Receiver | Multichannel Data Acquisition |
|---|---|
|
Use Scenario: Receiving analog current signals from field transmitters in PLC analog input modules, where ground potential differences exceed 10V. IC Role / Device Role / Timing Role: ISO103 acts as galvanically isolated signal conditioner - converting 4–20mA to ±10V output while providing isolated ±15V to power the transmitter's excitation circuit. Use Value: Eliminates ground loops without external isolated DC/DC; achieves <0.03% THD+N at 1kHz and maintains 130dB IMR at 1500Vrms barrier stress. |
Use Scenario: Simultaneous sampling of multiple high-voltage motor phase currents in VFDs using synchronized ADC front-ends. IC Role / Device Role / Timing Role: ISO103 serves as channel-isolated analog front-end - each unit conditioned and synchronized via shared 1.6MHz TTL clock to eliminate inter-channel beat frequencies. Use Value: Enables deterministic 20kHz sampling across ≥20 channels with <100ps skew; ripple rejection >130dB prevents crosstalk between adjacent channels. |
| Motor Control Feedback Isolation | Power Supply Monitoring |
|
Use Scenario: Isolating rotor position encoder signals or current-sense outputs in servo drives operating at >600V bus voltages. IC Role / Device Role / Timing Role: ISO103 isolates analog feedback (e.g., shunt voltage) from gate driver domain - powered by primary-side ±15V and delivering clean ±10V to controller ADC. Use Value: Withstands dv/dt up to 20kV/µs; maintains gain stability (±60ppm/°C) across –25°C to +85°C ambient - ensuring torque accuracy over temperature. |
Use Scenario: Monitoring output voltage/current of industrial AC/DC power supplies where secondary-side sensing must be referenced to primary ground. IC Role / Device Role / Timing Role: ISO103 functions as isolated error amplifier interface - sensing secondary-side voltage, transmitting error signal across barrier to primary-side PWM controller. Use Value: Delivers ±10V output with ±0.12% gain error and <75µs settling time - enabling fast transient response (<10µs overload recovery) in regulated supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AMC1301 | Replaces transformer coupling with sigma-delta modulation; 10MHz bandwidth; 5kVRMS reinforced isolation; requires external LDO for isolated side | Higher bandwidth and CMTI (>100kV/µs) suit digital motor control; lacks built-in isolated power - needs external DC/DC | Select AMC1301 when system already includes isolated power and demands >10x bandwidth or enhanced noise immunity |
| ISO124 | Capacitive-coupled isolation amplifier; 100kHz bandwidth; ±13V input range; no integrated isolated power - requires external isolated supply | Better high-frequency linearity for audio/test equipment; lower cost but adds BOM complexity for power | Choose ISO124 only if isolated power is available elsewhere and >20kHz bandwidth is required with minimal drift |
Compared with ISO103, AMC1301 offers superior noise immunity and bandwidth but removes integrated power - increasing design complexity. ISO124 provides higher small-signal bandwidth but lacks on-chip DC/DC, making ISO103 uniquely suited for self-contained isolated analog signal chains requiring both signal and power transfer.
Availability
ISO103 is available at Aetrix Electronics and suitable for industrial motor control, isolated data acquisition, and 4–20mA loop receiver applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for legacy system maintenance.
Supply support for ISO103 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
Burr-Brown Corporation, acquired by Texas Instruments in 2000, specialized in precision analog ICs including data converters, amplifiers, and isolation components for industrial and instrumentation markets.
The ISO103 belongs to Burr-Brown's high-voltage isolation amplifier product line, designed specifically for applications demanding simultaneous signal and power transfer across reinforced barriers in harsh industrial environments.
FAQ
What is the maximum continuous isolation voltage rating for ISO103?
The ISO103 has a rated continuous isolation voltage of 1500Vrms at 60Hz, verified per UL1244 with 100% unit testing. It also supports 2121VDC continuous rating and withstands 5600Vpk for 10 seconds during production test - confirming robust dielectric strength for industrial mains-referenced systems.
Does ISO103 provide isolated power, and what are its output capabilities?
Yes, ISO103 integrates a transformer-coupled DC/DC converter delivering ±15V at up to ±50mA on the isolated side (Pins 1/2 and 3/4). Output voltage remains stable within ±0.3%/mA load regulation and ±2.5mV/°C temperature drift - sufficient to power external op-amps, RTD bridges, or sensor signal conditioners without additional isolated supplies.
How does the Sync pin (Pin 15) function in ISO103, and what frequency range is supported?
The Sync pin (Pin 15) accepts a 1.2–2MHz TTL-level clock to synchronize the internal 800kHz carrier across multiple ISO103 units. Grounding this pin enables unsynchronized operation. The specified range ensures deterministic phase alignment with <100ps inter-channel skew - critical for multichannel data acquisition systems avoiding beat-frequency distortion.
Can ISO103 operate with input supply voltages other than ±15V?
Yes, ISO103 supports ±10V to ±18V on the primary-side power pins (+VCC2/–VCC2). At ±10V input, output voltage drops to ±14.25V under 15mA load; at ±18V, it reaches ±15.75V. Line regulation is 1.12V/V, meaning output varies linearly with input - allowing flexible integration into existing ±12V or ±15V system rails.
What is the purpose of the Sense pin (Pin 10), and how should it be connected?
The Sense pin (Pin 10) provides remote voltage sensing at the load to compensate for IR drop in output traces. It must be connected directly to the load's return node - not to Gnd2 - while VOUT (Pin 9) drives the load. This 4-wire Kelvin connection ensures output accuracy remains within ±0.026% FSR even with 1Ω trace resistance, essential for precision 4–20mA loop receivers.
ISO103 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-CDIP (0.600", 15.24mm), 16 Leads
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Isolation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1.5V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 20 kHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 20 mV
- Current - Supply:
- 90mA
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 20 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CDIP
ISO103 FAQ
1.How can I place an order for ISO103 through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO103 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 ISO103 reliable?
The price and inventory of ISO103 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO103 is usually 5 days.
3.What payment methods are accepted for ISO103?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO103 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO103?
ISO103 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO103 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 ISO103?
For technical support, including ISO103 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO103 requirements.
6.How does Aetrix verify that ISO103 is sourced from the original manufacturer or authorized distributors?
All ISO103 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 ISO103 meets industry standards.
7.What is the process for return or replacement of ISO103?
All ISO103 units undergo pre-shipment inspection (PSI). If there is an issue with ISO103, 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 ISO103 part is unused and in its original packaging.
Return procedure for ISO103:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO103 Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
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LM324PWR
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LM2902PWR
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LM2902DR
Texas Instruments
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LM358P
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