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Texas Instruments ISO113B
- Part No.:
- ISO113B
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 24-CDIP (0.600", 15.24mm), 16 Leads
- Datasheet:
-
ISO113B.pdf
- Description:
- IC OPAMP ISOLATION 1 CIRC 16CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,325
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Product details
Overview
ISO113B from Texas Instruments (originally Burr-Brown) is a high-voltage, internally powered output isolation amplifier in a 24-pin ceramic sidebraze DIP package. It provides galvanic isolation for both signal and ±15V isolated output power, delivers ±50mA output current, supports 1500Vrms continuous barrier rating, and features 20kHz small-signal bandwidth. It is used in industrial 4–20mA loop drivers where input-to-output isolation and local load powering are required.
For engineers reviewing the ISO113B datasheet, ISO113B pinout, ISO113B application, or ISO113B equivalent, this page details its transformer-coupled DC/DC converter architecture, duty-cycle modulation signal path, multichannel synchronization capability via TTL Sync input, and design considerations for ripple reduction, gain trimming, and VOS adjustment.
Technical Context
The ISO113B integrates a proprietary 800kHz oscillator, power MOSFET transformer drivers, and a wirebonded square-core transformer to generate isolated ±VCC2 supply rails. Its signal channel uses capacitor-coupled duty-cycle modulation with laser-trimmed transmitter-receiver ICs and matched fringe capacitors across the ceramic barrier.
It supports synchronized multichannel operation via external TTL clock (1.2–2MHz) applied to Pin 3 (Sync), and includes Enable control (Pin 1) to disable transformer drive while maintaining signal modulator activity. The internal 0.1µF bypass capacitors on all supply pins reduce layout sensitivity, and separate Sense and Com1 pins minimize IR-drop errors in remote sensing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 1500Vrms continuous AC (60Hz); enables safe interfacing between high-voltage field circuits and low-voltage control logic. |
| Isolated Output Power | ±14.25V to ±15.75V at 15mA; powers external loads (e.g., op-amps, transducers) without secondary supplies. |
| Signal Bandwidth | 20kHz small-signal; supports dynamic analog signals in motor control feedback and medical instrumentation outputs. |
| Gain Accuracy | ±0.3% initial error (TYP); ensures precise scaling in 4–20mA V/I converters without factory calibration. |
| Nonlinearity | ±0.03% FSR (–5V to +5V range); critical for high-fidelity isolated recorder outputs and gas analyzer signal conditioning. |
| Input Impedance | 200kΩ; minimizes loading on precision sensor bridges and voltage sources in medical instrumentation. |
| Sync Frequency Range | 1.2–2MHz TTL input; allows deterministic phase alignment of multiple ISO113B units in multichannel data acquisition systems. |
Pinout & Package
ISO113B is housed in a 24-pin ceramic double-wide sidebraze DIP (0.6" width), specified per drawing JVB, with 100% UL1244-compliant barrier breakdown testing. The non-hermetic hybrid package integrates transformer and fringe capacitors within the ceramic substrate.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Enable) | Transformer driver enable control | TTL-compatible input; open or high enables isolated power; low disables DC/DC converter to reduce quiescent current. |
| 2 (Gnd1) | Primary-side ground reference | Return for ±VCC1, VIN, and Com1; must be separated from Gnd2 to maintain isolation integrity. |
| 3 (Sync) | External synchronization input | Accepts 1.2–2MHz TTL clock to align carrier phase across multiple ISO113B units; grounded for unsynchronized operation. |
| 4 (Com1) | Input common reference | Low-current connection to source ground; reduces offset error from lead resistance in remote sensor interfaces. |
| 9 (VIN) | Differential input voltage terminal | Accepts ±10V to ±15V input range; high-impedance node referenced to Com1 for precision analog signal injection. |
| 10 (Sense) | Output voltage sense feedback | Connects to load return to compensate for IR drop in long traces; improves output regulation accuracy by >50%. |
| 11 (VOUT) | Isolated output signal | Delivers amplified, isolated version of VIN; drives up to ±15mA into 400Ω/4.7nF load with ≤5mVp-p ripple (with filter). |
| 12 (Gnd2) | Secondary-side ground reference | Return for ±VCC2, ±VC, and Sense; electrically isolated from Gnd1; defines output-side signal reference plane. |
| 13,14 (+VCC2, –VCC2) | Isolated DC/DC output rails | Provide ±15V unregulated power; capable of ±50mA total output; support external circuitry on isolated side. |
| 15,16 (+VC, –VC) | Isolated amplifier supply inputs | Power the output-stage op-amp; accept ±10V to ±18V; decoupled internally with 0.1µF caps to Gnd2. |
| 21,22 (+VCC1, –VCC1) | Primary-side power inputs | Accept ±10V to ±18V; supply both signal modulator and transformer driver; include internal 0.1µF bypass caps. |
| 23 (Ps Gnd) | Transformer primary ground | Dedicated ground for transformer driver stage; should be tied to Gnd1 with low-inductance path to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Self-contained isolated power | Eliminates need for external isolated DC/DC converters-reduces BOM count and board area by >4.6cm². |
| Capacitor-coupled signal channel | Enables high CMRR (>130dB at 1500Vrms) and low barrier capacitance (<9pF), minimizing AC leakage currents. |
| Soft-start and current-limited DC/DC | Prevents inrush damage during power-up and protects against sustained short-circuits on ±VCC2 outputs. |
| Multichannel sync capability | Ensures coherent carrier timing across ≥20 channels using one PWS750-1 oscillator, avoiding beat-frequency interference. |
| Separate Sense and Com1 terminals | Compensates for voltage drop in 10+ meter wiring runs-critical for accurate 4–20mA loop outputs in process control. |
Applications
| 4–20mA V/I Converters | Motor & Valve Controllers |
|---|---|
|
Use Scenario: Converting PLC analog outputs to isolated 4–20mA current loops driving field actuators in hazardous areas. IC Role / Device Role / Timing Role: Isolation amplifier providing signal integrity and local ±15V power for the current-sense op-amp and transistor driver. Use Value: Enables single-component isolation + power delivery, eliminating discrete DC/DC and optocoupler combinations while meeting IEC 61000-4-5 surge immunity requirements. |
Use Scenario: Closed-loop position control of industrial servo valves using isolated feedback from LVDTs or potentiometers. IC Role / Device Role / Timing Role: High-bandwidth (20kHz) isolated signal conditioner delivering clean, low-drift analog output to valve driver stages. Use Value: Maintains <±0.03% FSR nonlinearity over temperature, ensuring sub-0.1% position accuracy in hydraulic control systems. |
| Isolated Recorder Outputs | Medical Instrumentation Outputs |
|
Use Scenario: Driving analog chart recorders or data loggers in electrically noisy plant environments with ground potential differences >1kV. IC Role / Device Role / Timing Role: Output isolation amplifier buffering and isolating measurement signals before transmission to recording equipment. Use Value: 1500Vrms barrier rating and 100% UL1244-tested insulation prevent ground-loop damage and ensure regulatory compliance (UL 508). |
Use Scenario: Providing patient-isolated analog outputs from ECG, EEG, or blood gas analyzers to monitoring displays or hospital networks. IC Role / Device Role / Timing Role: Safety-rated isolation amplifier delivering low-noise (4µV/√Hz), low-leakage (<2µA at 240Vrms) signal paths. Use Value: Meets IEC 60601-1 creepage/clearance requirements and supports 2× MOPP isolation when combined with proper PCB layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar output isolation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISO122P | Higher gain accuracy (±0.05% FSR), lower noise (2.5µV/√Hz), but no integrated isolated power; requires external DC/DC. | Better suited for ultra-precision sensor signal conditioning where local power is already available. | Select ISO122P only if isolated power is provided elsewhere and sub-0.1% linearity is mandatory. |
| AMC1301DWV | Replaces analog isolation with reinforced sigma-delta modulator + digital filter; 7000Vpk isolation; no isolated DC output. | Targets modern digital-control systems requiring SPI interface and immunity to EMI-induced analog corruption. | Choose AMC1301DWV for new designs needing higher isolation ratings and digital integration-not for legacy analog loop replacement. |
Compared with ISO113B, ISO122P offers superior signal fidelity but lacks self-powered operation, while AMC1301DWV provides higher isolation and digital output at the cost of analog compatibility and external power dependency.
Availability
ISO113B is available at Aetrix Electronics and suitable for industrial 4–20mA loop interfaces, motor control feedback systems, and medical device analog outputs requiring stable component supply under extended lifecycle management.
Supply support for ISO113B 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 (TI) acquired Burr-Brown in 2000 and maintains its precision analog portfolio. TI is a global semiconductor leader focused on analog, embedded processing, and connectivity solutions.
The ISO113B belongs to TI's legacy isolation amplifier product line, designed specifically for applications demanding integrated signal + power isolation in compact industrial and medical instrumentation.
FAQ
What is the maximum continuous isolation voltage rating for the ISO113B?
The ISO113B has a rated continuous isolation voltage of 1500Vrms at 60Hz, verified by 100% UL1244-compliant testing. This rating applies across the full operating temperature range (–25°C to +85°C) and is supported by internal barrier construction using ceramic substrate and side-brazed leads. The ISO113B also supports 2121VDC and 5657Vpk breakdown per specification table.
Can the ISO113B power external circuitry on the isolated side?
Yes, the ISO113B provides ±14.25V to ±15.75V at up to ±50mA total output current on its ±VCC2 pins. This built-in isolated power eliminates the need for external DC/DC converters in applications like 4–20mA loop drivers or isolated op-amp stages. The output voltage varies with load and temperature, with balanced-load regulation of 0.3%/mA.
How does the Sync pin (Pin 3) function in the ISO113B?
The Sync pin accepts an external TTL-level clock (1.2–2MHz, >25% duty cycle) to synchronize the internal 800kHz carrier across multiple ISO113B units. When grounded, the device operates in unsynchronized mode. Synchronization prevents beat-frequency interference in multichannel systems-up to 20 devices can be driven by one PWS750-1 oscillator per application note.
What is the purpose of the Sense and Com1 pins on the ISO113B?
Sense (Pin 10) connects to the remote load return to compensate for IR drop in output traces, improving regulation accuracy. Com1 (Pin 4) serves as the low-current reference for VIN, reducing offset errors caused by ground-path resistance in long sensor cables. Both pins enable precision performance in field-installed instrumentation where wiring impedance cannot be ignored.
Does the ISO113B require external components for basic operation?
No-ISO113B operates with only bypass capacitors on ±VCC1 and ±VCC2. However, recommended external components include π-filter inductors (L1) and capacitors (C1, C2) for low-noise applications, and optional LO/CO filtering for ripple-sensitive loads. Gain and offset trims are optional; nominal performance meets spec without them.
ISO113B 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
ISO113B FAQ
1.How can I place an order for ISO113B through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO113B 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 ISO113B reliable?
The price and inventory of ISO113B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO113B is usually 5 days.
3.What payment methods are accepted for ISO113B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO113B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO113B?
ISO113B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO113B 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 ISO113B?
For technical support, including ISO113B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO113B requirements.
6.How does Aetrix verify that ISO113B is sourced from the original manufacturer or authorized distributors?
All ISO113B 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 ISO113B meets industry standards.
7.What is the process for return or replacement of ISO113B?
All ISO113B units undergo pre-shipment inspection (PSI). If there is an issue with ISO113B, 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 ISO113B part is unused and in its original packaging.
Return procedure for ISO113B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO113B 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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LM324DR
Texas Instruments
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
Microchip Technology
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LM324PWR
Texas Instruments
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LM2902PWR
Texas Instruments
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LM2902DR
Texas Instruments
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LM358P
Texas Instruments
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