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Texas Instruments ISO7221BDR
- Part No.:
- ISO7221BDR
- Manufacturer:
- Texas Instruments
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISO7221BDR.pdf
- Description:
- DGTL ISO 2500VRMS 2CH GP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,990
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Product details
Overview
ISO7221BDR from Texas Instruments is a dual-channel digital isolator with opposite-direction channel orientation, 5 Mbps signaling rate, ≤3 ns channel-to-channel output skew, and 1 ns max pulse-width distortion. It provides 4000 VPK galvanic isolation per VDE 0884-17 and operates across –40°C to +125°C for industrial fieldbus interface applications.
For engineers reviewing the ISO7221BDR datasheet, ISO7221BDR pinout, ISO7221BDR application, or ISO7221BDR equivalent, this device delivers verified high CMTI (≥25 kV/μs), failsafe logic-high output on input power loss, and dual independent supply support (2.8V/3.3V/5V) for mixed-voltage system isolation.
Technical Context
The ISO7221BDR uses TI's silicon-dioxide (SiO₂) isolation barrier to separate input and output logic buffers, enabling galvanic isolation up to 4000 VPK. Its differential comparator-based architecture detects logic transitions across the barrier and drives flip-flop outputs with periodic DC-refresh pulses every 4 μs.
It implements TTL-compatible input thresholds with integrated noise filtering and supports asymmetric supply configurations (e.g., 5V input / 3.3V output). The failsafe circuit asserts logic high at the outputs if DC-refresh pulses are absent for >4 μs-indicating input-side power loss or undriven state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Signaling Rate | 5 Mbps - supports Profibus and DeviceNet data rates without oversampling or external clock conditioning |
| Channel-to-Channel Output Skew | ≤3 ns max - ensures synchronized timing between isolated A/B channels in servo control feedback loops |
| Pulse-Width Distortion | ≤3 ns max - preserves duty cycle integrity for PWM signals in motor drive gate driver interfaces |
| Common-Mode Transient Immunity | ≥25 kV/μs - suppresses noise coupling in high-noise factory automation environments with variable-frequency drives |
| Isolation Voltage Rating | 4000 VPK per VDE 0884-17 - meets reinforced insulation requirements for IEC 61010-1 safety-critical measurement equipment |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive ECUs and industrial PLC backplanes without derating |
| Failsafe Output Behavior | Logic-high assertion within 3 μs of input power loss - prevents undefined states in safety-monitored control systems |
Pinout & Package
ISO7221BDR is housed in an 8-pin SOIC (D package) with 4.90 mm × 3.91 mm body size and 4.9 mm × 6 mm overall footprint. The package supports surface-mount reflow and provides creepage/clearance ≥4 mm per IEC 60664-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INA | Input, Channel A | Accepts TTL-level signal referenced to VCC1/GND1; 5V-tolerant when VCC1 = 2.8V or 3.3V |
| INB | Input, Channel B | Independent TTL input referenced to same VCC1/GND1 domain as INA |
| VCC1 | Input-Side Power Supply | Supplies input buffer and isolation barrier transmitter; accepts 2.8V/3.3V/5V |
| GND1 | Input-Side Ground | Reference return for VCC1 and input signals; galvanically isolated from GNDO |
| OUTA | Output, Channel A | CMOS output referenced to VCC2/GNDO; drives 4 mA load with VCC2 = 3.3V or 5V |
| OUTB | Output, Channel B | Independent CMOS output referenced to same VCC2/GNDO domain as OUTA |
| VCC2 | Output-Side Power Supply | Supplies output buffer and isolation barrier receiver; accepts 2.8V/3.3V/5V independently of VCC1 |
| GND2 | Output-Side Ground | Reference return for VCC2 and output signals; galvanically isolated from GND1 |
Key Features
| Feature | Design Value |
|---|---|
| TTL input thresholds with noise filter | Rejects <200 ns transients at inputs-prevents false triggering in electrically noisy PLC I/O modules |
| Opposite-direction channel layout | Enables straight-through PCB routing for bidirectional serial buses like RS-485 half-duplex links |
| Failsafe output on input power loss | Guarantees known logic-high state within 3 μs-critical for SIL-2 functional safety monitoring paths |
| 4000 VPK reinforced isolation | Meets VDE 0884-17 and UL 1577 requirements-enables single-component isolation in medical and industrial safety barriers |
| 2.8V/3.3V/5V dual-supply flexibility | Supports mixed-voltage domains (e.g., 5V MCU ↔ 3.3V FPGA) without level shifters or external regulators |
Applications
| Factory Automation Interface | Servo Motor Control |
|---|---|
|
Use Scenario: Isolating Modbus RTU or Profibus DP signals between PLC master and remote I/O modules in high-noise factory floors. IC Role / Device Role / Timing Role: Dual-channel signal isolator providing galvanic separation between controller and fieldbus transceivers while preserving timing integrity. Use Value: Enables reliable communication at 5 Mbps with ≤3 ns inter-channel skew-meeting Profibus DP Class 1 timing budgets without added delay compensation. |
Use Scenario: Isolating position encoder feedback (A/B/Z quadrature) and PWM gate drive enable signals in closed-loop servo drives. IC Role / Device Role / Timing Role: Synchronized dual-channel isolator delivering matched propagation delay (<70 ns) and sub-3 ns skew between feedback and control paths. Use Value: Maintains phase coherence between encoder and PWM signals-reducing torque ripple and improving velocity regulation accuracy. |
| Data Acquisition System | Industrial Safety Monitoring |
|
Use Scenario: Isolating analog-to-digital converter (ADC) digital interface lines (e.g., SPI clock/data) from microcontroller in high-voltage test equipment. IC Role / Device Role / Timing Role: High-CMTI (≥25 kV/μs) isolator protecting low-voltage ADC interface from ground loop noise and transient surges. Use Value: Prevents data corruption during 6 kV ESD events or fast transients-ensuring ±0.1% measurement accuracy in Class I test instruments. |
Use Scenario: Isolating emergency stop (E-stop) and safety relay status signals in Category 3/PLd machinery control systems. IC Role / Device Role / Timing Role: Failsafe-enabled isolator asserting logic-high on input power loss-used in diagnostic monitoring paths per IEC 62061. Use Value: Guarantees safe shutdown state within 3 μs of primary side failure-supporting SIL 2 compliance without external watchdog circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM1201BRZ | 25 kV/μs CMTI, 100 Mbps max, 3.3V-only supply, no failsafe output | Lacks failsafe behavior and dual-supply flexibility-requires external pull-up and voltage translation for 5V systems | Prefer ISO7221BDR where input-side power loss detection or mixed-voltage operation is required |
| SI8621ED-B-IS | 50 kV/μs CMTI, 100 Mbps, 2.5–5.5V supply, failsafe configurable via pin | Higher CMTI but requires external configuration resistor for failsafe mode; different pinout and thermal profile | Choose ISO7221BDR for guaranteed built-in failsafe and proven SOIC-8 layout compatibility in legacy designs |
Compared with ADUM1201BRZ and SI8621ED-B-IS, ISO7221BDR uniquely combines fixed failsafe logic-high assertion, 5 Mbps precision timing (≤3 ns skew), and native 2.8V/3.3V/5V dual-supply support-making it optimal for safety-aware industrial fieldbus and servo interfaces where reliability and timing predictability are non-negotiable.
Availability
ISO7221BDR is available at Aetrix Electronics and suitable for factory automation, servo control, and industrial data acquisition requiring stable component supply, long-term lifecycle assurance, and full traceability.
Supply support for ISO7221BDR 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, embedded processing, and high-reliability components for industrial, automotive, and communications markets.
The ISO722x family was designed specifically for robust digital signal isolation in harsh industrial environments-emphasizing timing precision, fail-safe behavior, and safety certification compliance over raw speed.
FAQ
What is the maximum signaling rate supported by ISO7221BDR?
The ISO7221BDR supports a maximum signaling rate of 5 Mbps. This is confirmed in the device's datasheet under Recommended Operating Conditions and Switching Characteristics sections for the 'B' option. At this rate, propagation delay remains ≤70 ns with pulse-width distortion ≤3 ns-making ISO7221BDR suitable for Profibus DP and DeviceNet applications without signal degradation.
Does ISO7221BDR include a failsafe output feature?
Yes, ISO7221BDR includes a built-in failsafe output feature. When input-side power (VCC1) is lost or the input is undriven, the device asserts a logic-high state on both outputs within 3 μs. This behavior is implemented via a 4 μs DC-refresh pulse mechanism and is documented in the Description and Switching Characteristics sections of the ISO7221BDR datasheet.
Can ISO7221BDR operate with different supply voltages on input and output sides?
Yes, ISO7221BDR supports independent input (VCC1) and output (VCC2) supplies ranging from 2.8V to 5V each. It is fully characterized for combinations including 5V/3.3V, 3.3V/5V, and 3.3V/3.3V. Input pins remain 5V-tolerant even when VCC1 = 2.8V or 3.3V-enabling direct interfacing with higher-voltage controllers without level shifters.
What safety certifications does ISO7221BDR hold?
ISO7221BDR is certified to DIN EN IEC 60747-17 (VDE 0884-17), UL 1577, IEC 61010-1, and IEC 62368-1. These certifications validate its reinforced insulation barrier (4000 VPK), partial discharge performance (<5 pC), and suitability for safety-critical end equipment including industrial control panels and test instrumentation.
How does ISO7221BDR differ from ISO7220BDR in layout and function?
ISO7221BDR features opposite-direction channel orientation (INA→OUTA left-to-right, INB→OUTB right-to-left), whereas ISO7220BDR has same-direction orientation. This enables straight-through PCB routing for bidirectional buses. Both share identical electrical specs (5 Mbps, TTL inputs, failsafe), but ISO7221BDR's pinout reduces layer count and crosstalk in RS-485 or CAN physical layer isolation layouts.
ISO7221BDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 2
- Inputs - Side 1/Side 2:
- 1/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 2500Vrms
- Common Mode Transient Immunity (Min):
- 25kV/µs
- Data Rate:
- 5Mbps
- Propagation Delay tpLH / tpHL (Max):
- 70ns, 70ns
- Pulse Width Distortion (Max):
- 3ns
- Rise / Fall Time (Typ):
- 1ns, 1ns
- Voltage - Supply:
- 3V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ISO7221BDR FAQ
1.How can I place an order for ISO7221BDR through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO7221BDR 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 ISO7221BDR reliable?
The price and inventory of ISO7221BDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO7221BDR is usually 5 days.
3.What payment methods are accepted for ISO7221BDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO7221BDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO7221BDR?
ISO7221BDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO7221BDR 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 ISO7221BDR?
For technical support, including ISO7221BDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO7221BDR requirements.
6.How does Aetrix verify that ISO7221BDR is sourced from the original manufacturer or authorized distributors?
All ISO7221BDR 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 ISO7221BDR meets industry standards.
7.What is the process for return or replacement of ISO7221BDR?
All ISO7221BDR units undergo pre-shipment inspection (PSI). If there is an issue with ISO7221BDR, 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 ISO7221BDR part is unused and in its original packaging.
Return procedure for ISO7221BDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO7221BDR Tags
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ISO1212DBQR
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ISO6721BDR
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SI8710AC-B-ISR
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ISO7720FDR
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SI8710CC-B-ISR
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ISO7721DWVR
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ISO7762FDBQR
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ISO7741DWR
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ISO7741FDWR
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