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Texas Instruments ISO7320CD
- Part No.:
- ISO7320CD
- Manufacturer:
- Texas Instruments
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISO7320CD.pdf
- Description:
- DGTL ISO 3000VRMS 2CH GP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,493
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Product details
Overview
ISO7320CD from Texas Instruments is a dual-channel, unidirectional digital isolator with capacitive isolation barrier, rated for 3000 VRMS (1 min) and 4242 VPK isolation, 25 Mbps signaling rate, 33 ns typical propagation delay at 5 V, and default-high output logic state. It enables galvanic separation between input-side (VCCI/GNDI) and output-side (VCCO/GNDO) domains in industrial motor control interfaces requiring robust noise immunity and level translation.
For engineers reviewing the ISO7320CD datasheet, ISO7320CD pinout, ISO7320CD application, or ISO7320CD equivalent, key selection criteria include its 65 kV/μs CMTI, integrated input noise filter, –40°C to 125°C operating range, 3.3 V/5 V dual-supply compatibility, and SOIC-8 narrow-body package with reinforced insulation per UL, VDE, CSA, and CQC standards.
Technical Context
The ISO7320CD implements a dual-capacitive isolation architecture with separate high-frequency (DC–25 Mbps) and low-frequency (DC–100 kbps) signal paths, using PWM modulation and LPF reconstruction for DC/low-speed signals. Its input buffers feature TTL-compatible thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) and 460 mV hysteresis for noise rejection.
Fail-safe operation defaults outputs to high upon input-side power loss, confirmed by tfs = 7.5 μs delay. The device supports independent 3.3 V or 5 V supplies on each side, with supply current scaling linearly with data rate-e.g., 0.9 mA per channel at 1 Mbps / 5 V, rising to 2.3 mA per channel at 25 Mbps / 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 3000 VRMS (1 min UL 1577), 4242 VPK (DIN V VDE V 0884-10) - enables reinforced insulation in safety-critical industrial systems |
| Signaling Rate | 25 Mbps - supports high-speed serial bus isolation including Modbus RTU and ProfiBus DP physical layer |
| Propagation Delay | 33 ns typical at 5 V - ensures timing-critical feedback loops (e.g., servo position control) remain closed-loop stable |
| CMTI | 65 kV/μs typical at 5 V - suppresses fast transients from IGBT switching noise in motor drives |
| Supply Range | VCCI and VCCO independently support 3 V to 5.5 V - allows level translation between 3.3 V microcontrollers and 5 V PLC I/O modules |
| Operating Temp | –40°C to 125°C - qualified for under-hood automotive subsystems and industrial inverters |
| Default Output | High - provides fail-safe active-state indication during input-side brownout or controller reset |
Pinout & Package
Narrow-body SOIC-8 (D package), 4.90 mm × 3.91 mm body size, with creepage/clearance ≥4 mm and CTI ≥400 V per DIN EN 60112.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCCI | Input-side power supply | Provides 3–5.5 V bias for input logic and isolation barrier transmitter; must be decoupled locally |
| 2: INA | Channel A input | TTL-compatible digital input (VIH ≥ 2 V); connects to MCU GPIO or UART TX line on isolated side |
| 3: INB | Channel B input | Independent TTL input for second signal path; used for bidirectional bus direction control or status feedback |
| 4: GNDI | Input-side ground reference | Return path for VCCI and input signals; must be separated from GNDO by PCB isolation gap ≥4 mm |
| 5: GNDO | Output-side ground reference | Return path for VCCO and output signals; forms isolated domain with VCCO for downstream logic or gate drivers |
| 6: OUTB | Channel B output | CMOS output driving isolated load (e.g., optocoupler replacement in servo enable circuit) |
| 7: OUTA | Channel A output | Unidirectional output mirroring INA; used for isolated data transmission to ADC or DAC interface |
| 8: VCCO | Output-side power supply | Supplies 3–5.5 V to output buffers; enables level-shifting to match downstream 3.3 V or 5 V logic |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Input Noise Filter | Rejects short-duration EFT pulses (<40 ns) without external RC networks-reduces BOM count in harsh industrial environments |
| Robust EMC Performance | System-level ESD (±4 kV HBM), EFT (IEC 61000-4-4), and surge (IEC 61000-4-5) immunity-eliminates need for external transient protection in fieldbus nodes |
| Low Power Consumption | 0.9 mA per channel at 1 Mbps / 5 V-enables thermally constrained designs such as battery-powered sensor gateways |
| Isolation Barrier Life | >25 years at rated voltage and temperature-meets long-lifecycle requirements for industrial automation infrastructure |
| 3.3 V / 5 V Level Translation | Supports mixed-voltage system interconnects (e.g., 3.3 V ARM Cortex-M host to 5 V legacy PLC backplane) |
Applications
| Industrial FieldBus Isolation | Motor Control Interface |
|---|---|
Use Scenario: Isolating RS-485 transceivers in Modbus RTU networks deployed in factory-floor PLC cabinets with high EMI. IC Role / Device Role / Timing Role: Dual-channel unidirectional isolator separating MCU UART lines from transceiver control and data lines while maintaining signal integrity at 115.2 kbps. Use Value: Prevents ground loop currents from corrupting communication and enables compliance with IEC 61000-4-5 surge immunity up to 4 kV. | Use Scenario: Providing isolated gate drive enable/disable signals and fault feedback in three-phase inverter drives. IC Role / Device Role / Timing Role: Channel A transmits PWM enable command from controller; Channel B returns IGBT overcurrent flag with <33 ns latency. Use Value: Ensures safe shutdown within <100 ns of fault detection, meeting SIL-2 functional safety timing constraints. |
| Servo Control Interface | Battery Pack Monitoring |
Use Scenario: Isolating position encoder quadrature signals and direction commands between servo amplifier and motion controller. IC Role / Device Role / Timing Role: Unidirectional isolation of A/B phase clock and DIR signals with matched propagation delay (<4 ns skew) to preserve encoder resolution. Use Value: Eliminates jitter-induced position error in high-precision CNC axes operating at >100 kRPM. | Use Scenario: Isolating cell voltage measurement data and balancing control signals in 48 V EV battery management systems. IC Role / Device Role / Timing Role: Transmitting analog-to-digital converter results and MOSFET gate commands across isolation barrier with fail-safe high default. Use Value: Guarantees open-circuit detection and safe discharge activation during microcontroller reset or supply dropout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel unidirectional digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISO7320CDR | Same electrical specs and pinout; tape-and-reel packaging only (no tube option) | Identical use in production assembly; no functional difference | Select ISO7320CDR for automated SMT placement; ISO7320CD for prototyping or low-volume hand-soldering |
| ADUM1200ARZ | Lower CMTI (25 kV/μs), no integrated noise filter, 100-year barrier life claim, different pinout (SOIC-8 but channel mapping differs) | Less suitable for high-noise motor drive environments; requires external filtering for EFT immunity | Choose ADUM1200ARZ only if legacy design reuse mandates Analog Devices footprint; verify layout changes for pin reassignment |
Compared with ISO7320CDR, the ISO7320CD offers identical performance in tube packaging for flexibility; versus ADUM1200ARZ, it delivers superior noise immunity and simplified layout via integrated filtering and standardized TI pinout-critical for time-sensitive industrial feedback loops.
Availability
ISO7320CD is available at Aetrix Electronics and suitable for industrial fieldbus nodes, motor control gate driver interfaces, servo amplifier feedback links, and battery pack monitoring systems requiring stable component supply across extended product lifecycles.
Supply support for ISO7320CD 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The ISO732x family was designed specifically for robust galvanic isolation in electrically noisy industrial environments, emphasizing high CMTI, fail-safe behavior, and regulatory compliance across global safety standards.
FAQ
What is the default output state of the ISO7320CD during input-side power loss?
The ISO7320CD defaults to high output state when VCCI drops below 2.1 V (powered-down condition), as confirmed in the Device Functional Modes table. This fail-safe behavior ensures that critical downstream circuits-such as motor enable lines or safety relays-remain asserted during controller brownout, preventing unintended shutdown. The delay from input power loss to output transition is 7.5 μs typical, enabling controlled system response. This characteristic is intrinsic to the ISO7320CD and does not require external components.
Does the ISO7320CD support independent 3.3 V and 5 V supplies on input and output sides?
Yes, the ISO7320CD supports independent VCCI and VCCO supplies ranging from 3 V to 5.5 V each. For example, VCCI can be 3.3 V (microcontroller domain) while VCCO is 5 V (PLC I/O module domain), enabling seamless level translation without external level shifters. Electrical characteristics-including VOH, VOL, and propagation delay-are specified separately for both 3.3 V and 5 V conditions in the datasheet. This dual-supply capability is fully implemented in the ISO7320CD and verified across temperature and voltage corners.
What safety certifications apply to the ISO7320CD?
The ISO7320CD carries UL 1577 (3000 VRMS, 1 minute), DIN V VDE V 0884-10 (4242 VPK, reinforced insulation), CSA Component Acceptance Notice 5A (IEC 60950-1, IEC 61010-1), and CQC GB4943.1-2011 certifications. These approvals cover die-level isolation barrier performance and package construction, including minimum creepage/clearance (≥4 mm) and CTI ≥400 V. All certifications are explicitly listed for the ISO7320CD in the official TI datasheet revision SLLSEK8C.
How does the ISO7320CD handle high-frequency noise on its input pins?
The ISO7320CD incorporates an integrated noise filter on both input channels, validated to reject short-duration transients down to 40 ns pulse width per the datasheet's tui specification. This eliminates the need for external RC filters in most industrial applications. The filter operates transparently-without affecting signal integrity at 25 Mbps-and is implemented in silicon, ensuring consistent performance across temperature and voltage. This feature is documented for the ISO7320CD in Section 1 (Features) and Section 8.3.1 of the TI datasheet.
Can the ISO7320CD replace optocouplers in existing designs without layout changes?
Yes, the ISO7320CD uses a standard narrow-body SOIC-8 package (D package) with identical footprint, pad dimensions, and thermal characteristics as industry-standard 8-pin optocouplers. Pin mapping is compatible with common optocoupler replacements: VCCI/VCCO align with VCC pins, INA/INB with input anodes, OUTA/OUTB with output collectors/emitters, and GNDI/GNDO with cathode/emitter grounds. No PCB redesign is required-only supply decoupling and isolation gap verification per TI layout guidelines. This drop-in capability is confirmed for the ISO7320CD in TI's Application Report SLOA175.
ISO7320CD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 2
- Inputs - Side 1/Side 2:
- 2/0
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 3000Vrms
- Common Mode Transient Immunity (Min):
- 25kV/µs
- Data Rate:
- 25Mbps
- Propagation Delay tpLH / tpHL (Max):
- 57ns, 57ns
- Pulse Width Distortion (Max):
- 4ns
- Rise / Fall Time (Typ):
- 2.4ns, 2.1ns
- Voltage - Supply:
- 3V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ISO7320CD FAQ
1.How can I place an order for ISO7320CD through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO7320CD 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 ISO7320CD reliable?
The price and inventory of ISO7320CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO7320CD is usually 5 days.
3.What payment methods are accepted for ISO7320CD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO7320CD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO7320CD?
ISO7320CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO7320CD 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 ISO7320CD?
For technical support, including ISO7320CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO7320CD requirements.
6.How does Aetrix verify that ISO7320CD is sourced from the original manufacturer or authorized distributors?
All ISO7320CD 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 ISO7320CD meets industry standards.
7.What is the process for return or replacement of ISO7320CD?
All ISO7320CD units undergo pre-shipment inspection (PSI). If there is an issue with ISO7320CD, 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 ISO7320CD part is unused and in its original packaging.
Return procedure for ISO7320CD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO7320CD Tags
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