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Texas Instruments ISO100AP
- Part No.:
- ISO100AP
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 18-CDIP (0.300", 7.62mm)
- Datasheet:
-
ISO100AP.pdf
- Description:
- IC OPAMP ISOLATION 1 CIRC 18CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,582
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Product details
Overview
ISO100AP from Burr-Brown is an optically-coupled linear isolation amplifier with 750V continuous isolation voltage, 60kHz small-signal bandwidth, and ultra-low 0.3µA rms leakage at 240V/60Hz. It operates as a current-to-voltage converter (VOUT = IINRF) or voltage-input amplifier (VOUT/VIN = RF/RIN), supporting unipolar and bipolar configurations for industrial transducer sensing and 4mA–20mA loop isolation.
For engineers reviewing the ISO100AP datasheet, ISO100AP pinout, ISO100AP application, or ISO100AP equivalent, key selection considerations include its 18-pin DIP package, ±25°C to +85°C operating range, laser-trimmed optical matching for <0.1% nonlinearity, and dual precision reference current sources enabling true bipolar operation without external components.
Technical Context
The ISO100AP uses a single LED coupled to two matched photodiodes (D1, D2) to achieve galvanic isolation: D1 provides negative feedback to the input op-amp (A1), while D2 delivers the isolated output current to the output stage (A2). This architecture ensures gain stability depends on optical match-not absolute component performance-enabling high linearity and low drift.
It supports both unipolar (IIN = –20µA to –0.02µA) and bipolar (IIN = ±10µA) operation via internal 12µA reference current sources (IREF1/IREF2) trimmed to <50nA matching error. The device achieves 146dB DC common-mode rejection (RIN = 10kΩ, gain = 100) and 108dB AC rejection at 60Hz, critical for ground-loop elimination in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 750V AC/DC continuous; enables safe interface between hazardous field-side sensors and protected control-side circuitry. |
| Small-Signal Bandwidth | 60kHz; supports amplification of fast industrial signals including motor control feedback and pressure transients. |
| Leakage Current | 0.3µA rms max at 240V/60Hz; minimizes measurement error in high-impedance biomedical and RTD bridge applications. |
| Input Offset Voltage (RTI) | 200µV max initial; laser-trimmed for stable DC accuracy in precision process control loops. |
| Nonlinearity | 0.03% max; ensures fidelity in analog signal transmission across isolation barrier without calibration. |
| Reference Current Matching | 50nA max mismatch; enables accurate zero-centered bipolar operation for thermocouple and AC sensor interfaces. |
| Operating Temperature | –25°C to +85°C; qualified for deployment in industrial enclosures without forced cooling. |
Pinout & Package
ISO100AP is housed in an 18-pin bottom-braze DIP package (Package Drawing #220), with 0.3-inch row spacing and through-hole mounting. Pin 1 is located at bottom-left corner when viewed from top with notch facing up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input Common | Galvanically isolated reference for input stage; must be routed separately from output common to prevent ground-loop coupling. |
| 2 | –In | Inverting input node of A1; connects to sensor return or transducer low-side in unipolar/bipolar configurations. |
| 3 | VOUT | Isolated output voltage node; drives load or next-stage amplifier with ±10V swing into 2kΩ. |
| 4 | Balance | Feedback connection point for optical nulling; tied to pin 5 in unipolar mode per datasheet Figure 1. |
| 5 | Balance | Duplicate balance terminal; connected to pin 4 for unipolar operation or left open in bipolar mode. |
| 6 | –VCCA1 | Negative supply for input-stage amplifier A1; requires ±15V for rated performance. |
| 7 | NC | No internal connection; must remain unconnected per datasheet Note (1). |
| 8 | +VCCA1 | Positive supply for input-stage amplifier A1; decoupling capacitor required near pin. |
| 9 | NC | No internal connection; must remain unconnected per datasheet Note (1). |
| 10 | +VCCA2 | Positive supply for output-stage amplifier A2; independent of A1 supplies for isolation integrity. |
| 11 | –VCCA2 | Negative supply for output-stage amplifier A2; must be isolated from A1 supplies. |
| 12 | RF | Feedback resistor connection; sets gain (VOUT = IINRF) and determines output swing limits. |
| 13 | IREF2 | Bipolar reference current source output; used with pin 14 to establish midscale zero in bipolar mode. |
| 14 | IREF1 | Bipolar reference current source input; matched to IREF2 for precise offset cancellation. |
| 15 | +In | Noninverting input node of A1; connects to sensor high-side or excitation source in bridge applications. |
| 16 | Output Common | Galvanically isolated reference for output stage; forms separate ground domain for downstream circuitry. |
| 17 | –In | Duplicate inverting input; tied to pin 2 in standard configurations per datasheet pin diagram. |
| 18 | Input Common | Duplicate input reference; tied to pin 1 to complete input-side reference network. |
Key Features
| Feature | Design Value |
|---|---|
| Optical feedback architecture | Uses LED-D1 optical path for input-stage negative feedback, eliminating reliance on absolute photodiode gain and enabling <0.03%/°C gain drift. |
| Laser-trimmed component matching | Photodiode pair (D1/D2) and reference currents trimmed to <50nA mismatch, ensuring <0.1% full-scale nonlinearity over temperature. |
| Dual precision reference sources | 12µA IREF1/IREF2 with 300ppm/°C tempco and 0.3nA/V supply rejection enable stable bipolar zero-centering without external DACs. |
| Configurable unipolar/bipolar modes | Pin-strappable operation: unipolar (pins 16–17) for 4–20mA loops; bipolar (pins 15–16) for thermocouples and AC-coupled sensors. |
| Ultra-low 60Hz leakage | 0.3µA rms at 240V/60Hz meets stringent medical and test equipment safety requirements for patient-connected devices. |
Applications
| Industrial Process Control | Biomedical Measurements |
|---|---|
|
Use Scenario: Isolating 4mA–20mA current loops in PLC analog input modules where field-side sensors operate at hazardous voltages. IC Role / Device Role / Timing Role: Galvanic isolator converting loop current to ground-referenced voltage while breaking ground paths between field and control domains. Use Value: Eliminates ground-loop noise and prevents damage from 750V fault transients, maintaining 12-bit accuracy in 16-bit ADC systems. |
Use Scenario: Amplifying low-level thermocouple outputs in patient-monitoring ECG/EMG front-ends requiring reinforced isolation. IC Role / Device Role / Timing Role: Bipolar-input isolation amplifier providing ±10µA input range and 60kHz bandwidth for dynamic physiological signals. Use Value: Achieves <0.3µA leakage at 240V/60Hz, satisfying IEC 60601-1 creepage/clearance requirements without external shielding. |
| Test Equipment | Data Acquisition |
|
Use Scenario: Building isolated differential probes for oscilloscopes measuring switching-node voltages in power electronics. IC Role / Device Role / Timing Role: Unipolar current-input amplifier with 60kHz bandwidth capturing fast transients in motor drive gate signals. Use Value: Delivers 146dB DC CMRR and 108dB 60Hz AC CMRR, rejecting common-mode noise from SMPS power rails. |
Use Scenario: Multi-channel isolated analog input for industrial DAQ systems acquiring RTD, strain gauge, and pressure bridge signals. IC Role / Device Role / Timing Role: Programmable-gain isolation amplifier supporting 8-channel multiplexing with individual offset trimming per channel. Use Value: Laser-trimmed 200µV RTI offset and 0.03% nonlinearity enable <0.1% system accuracy without per-channel calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AMC1301DWVR | Reinforced 5kVrms isolation, 20MHz bandwidth, but only voltage-input (no current-input mode); requires external shunt resistor. | Optimized for high-speed motor phase current sensing, not low-frequency precision transducer isolation. | Select AMC1301DWVR for >100kHz bandwidth needs and higher isolation ratings; avoid for µA-level current inputs or bipolar operation. |
| ISO124P | Lower 2500VDC test isolation, 10kHz bandwidth, no internal reference sources; requires external trim for bipolar zero. | Suitable for cost-sensitive unipolar applications where 60kHz bandwidth and laser-trimmed bipolar operation are unnecessary. | Select ISO124P for basic unipolar isolation with tighter budget constraints; retain ISO100AP when bipolar mode or 60kHz response is required. |
Compared with AMC1301DWVR and ISO124P, the ISO100AP uniquely combines current-input capability, integrated bipolar reference sources, and 60kHz bandwidth in a single 18-pin DIP-making it irreplaceable for legacy industrial designs requiring direct µA-range transducer interfacing without layout changes.
Availability
ISO100AP is available at Aetrix Electronics and suitable for industrial process control, biomedical instrumentation, and test equipment requiring stable component supply with long-term lifecycle support.
Supply support for ISO100AP 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 was a U.S.-based analog semiconductor pioneer, acquired by Texas Instruments in 2000, renowned for high-precision data acquisition and isolation products.
The ISO100AP belongs to Burr-Brown's optically-coupled isolation amplifier family, designed specifically for high-accuracy, low-drift signal conditioning in electrically noisy industrial and medical environments where galvanic isolation is mandatory.
FAQ
What is the maximum continuous isolation voltage rating for the ISO100AP?
The ISO100AP has a rated continuous isolation voltage of 750V AC or DC, verified per UL standards. This rating applies across the full operating temperature range of –25°C to +85°C and allows safe interfacing between hazardous field-side circuits and protected control-side electronics without additional isolation barriers. The device also withstands 2500V DC for 10 seconds during production testing.
Can the ISO100AP operate in both unipolar and bipolar modes, and how is the mode selected?
Yes, the ISO100AP supports both unipolar and bipolar operation via pin strapping. For unipolar mode, connect pins 16 and 17; for bipolar mode, connect pins 15 and 16. The internal 12µA reference current sources (IREF1/IREF2) enable true bipolar zero-centering without external components, allowing ±10µA input range in bipolar mode versus –20µA to –0.02µA in unipolar mode.
What is the small-signal bandwidth of the ISO100AP, and how does it affect signal fidelity?
The ISO100AP delivers a small-signal bandwidth of 60kHz at unity gain (1V/µA), enabling accurate amplification of fast industrial signals such as motor encoder feedback, pressure transients, and switching power supply ripple. Its 5kHz full-power bandwidth (±10V output) ensures minimal distortion for large-swing signals, while the 0.22V/µs slew rate maintains fidelity in dynamic applications without overshoot or settling delay.
How does the ISO100AP achieve low offset voltage and high linearity?
The ISO100AP achieves 200µV max input-referred offset voltage and 0.03% max nonlinearity through laser-trimming of its optical cavity components (LED, D1, D2) and precision amplifier stages. This trimming compensates for manufacturing variations in photodiode responsivity and op-amp parameters, ensuring that gain and offset errors depend on optical match-not absolute component tolerances-resulting in stable performance over temperature and time.
What are the power supply requirements for the ISO100AP input and output stages?
The ISO100AP requires separate isolated ±15V supplies for both input (pins 6, 8) and output (pins 10, 11) stages to maintain galvanic isolation integrity. Supply current ranges from ±1.1mA (quiescent) to +13mA/–2mA (max under full load), with derated operation supported down to ±7V and up to ±18V. Decoupling capacitors must be placed near each supply pin to suppress high-frequency noise coupling across the isolation barrier.
ISO100AP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 18-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Isolation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.31V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 60 kHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 8mA
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 14 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 18-CDIP
ISO100AP FAQ
1.How can I place an order for ISO100AP through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO100AP 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 ISO100AP reliable?
The price and inventory of ISO100AP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO100AP is usually 5 days.
3.What payment methods are accepted for ISO100AP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO100AP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO100AP?
ISO100AP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO100AP 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 ISO100AP?
For technical support, including ISO100AP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO100AP requirements.
6.How does Aetrix verify that ISO100AP is sourced from the original manufacturer or authorized distributors?
All ISO100AP 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 ISO100AP meets industry standards.
7.What is the process for return or replacement of ISO100AP?
All ISO100AP units undergo pre-shipment inspection (PSI). If there is an issue with ISO100AP, 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 ISO100AP part is unused and in its original packaging.
Return procedure for ISO100AP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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