Dual Channel, 2/0, 1Mbps Digital Isolator - ISO7220A


Dual Channel, 2/0, 1Mbps Digital Isolator

Recommended alternative parts

  • ISO7320C  -  Pin-to-pin upgrade from ISO7220A/B/C and ISO7420/E with 20% higher isolation (3kVrms), lower power consumption and better immunity and robustness.


The ISO7220 and ISO7221 are dual-channel digital isolators. To facilitate PCB layout, the channels are oriented in the same direction in the ISO7220 and in opposite directions in the ISO7221. These devices have a logic input and output buffer separated by TI’s silicon-dioxide (SiO2) isolation barrier, providing galvanic isolation of up to 4000 VPK per VDE. Used in conjunction with isolated power supplies, these devices block high voltage, isolate grounds, and prevent noise currents on a data bus or other circuits from entering the local ground and interfering with or damaging sensitive circuitry.

A binary input signal is conditioned, translated to a balanced signal, then differentiated by the capacitive isolation barrier. Across the isolation barrier, a differential comparator receives the logic transition information, then sets or resets a flip-flop and the output circuit accordingly. A periodic update pulse is sent across the barrier to ensure the proper dc level of the output. If this dc-refresh pulse is not received every 4 μs, the input is assumed to be unpowered or not being actively driven, and the failsafe circuit drives the output to a logic high state.

The small capacitance and resulting time constant provide fast operation with signaling rates available from 0 Mbps (dc) to 150 Mbps. The signaling rate of a line is the number of voltage transitions that are made per second expressed in the units bps (bits per second). The A-, B- and C-option devices have TTL input thresholds and a noise filter at the input that prevents transient pulses from being passed to the output of the device. The M-option devices have CMOS VCC/2 input thresholds and do not have the input noise-filter and the additional propagation delay.

These devices require two supply voltages of 2.8 V (C-Grade), 3.3 V, 5 V, or any combination. All inputs are 5-V tolerant when supplied from a 2.8-V or 3.3-V supply and all outputs are 4-mA CMOS.

These devices are characterized for operation over the ambient temperature range of –40°C to 125°C.


  • 1, 5, 25, and 150-Mbps Signaling Rate Options
    • Low Channel-to-Channel Output Skew;
      1-ns max
    • Low Pulse-Width Distortion (PWD); 1-ns max
    • Low Jitter Content; 1 ns Typ at 150 Mbps
  • 50 kV/µs Typical Transient Immunity
  • Operates with 2.8-V (C-Grade), 3.3-V or 5-V Supplies
  • 4-kV ESD Protection
  • High Electromagnetic Immunity
  • –40°C to 125°C Operating Range
  • Typical 28-Year Life at Rated Voltage
    (see application report High-Voltage Lifetime of the
    ISO72x Family of Digital Isolators
  • VDE Basic Insulation with 4000-VPK VIOTM, 560 VPK
    VIORM per DIN EN 60747-5-5 (VDE 0884-5)
    and DIN EN 61010-1 (VDE 0411-1)
  • 2500 VRMS Isolation per UL 1577
  • CSA Approved for Component Acceptance Notice 5A
    and IEC 60950-1
    • Industrial Fieldbus
      • Modbus
      • Profibus™
      • DeviceNet™ Data Buses
    • Computer Peripheral Interface
    • Servo Control Interface
    • Data Acquisition

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Parametrics Compare all products in Digital Isolators

UL 1577 Isolation Voltage (Single) (Vrms)
DIN V VDE V 0884-10 Transient Overvoltage Rating (Vpk)
DIN V VDE V 0884-10 Surge Voltage Rating (Vpk)
DIN V VDE V 0884-10 Working Voltage (Vpk)
Number of Channels (#)
Forward/Reverse Channels
Supply Voltage(s) (V)
Default Output
CSA 60950-1 Basic Working (Vrms)
CSA 60950-1 Reinforced Working (Vrms)
CSA Isolation Rating (Vrms)
TTL/CMOS Input Threshold
Propagation Delay (ns)
Operating Temperature Range (C)
Approx. Price (US$)
ISO7220A ISO7220C ISO7220M ISO7221A ISO7221C ISO7221M
2500     2500     2500     2500     2500     2500    
4000     4000     4000     4000     4000     4000    
4000     4000     4000     4000     4000     4000    
560     560     560     560     560     560    
2     2     2     2     2     2    
2/0     2/0     2/0     1/1     1/1     1/1    
High     High     High     High     High     High    
390     390     390     390     390     390    
125     125     125     125     125     125    
2000     2000     2000     2000     2000     2000    
TTL     TTL     CMOS     TTL     TTL     CMOS    
405     36     10     405     36     10    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
8SOIC     8SOIC     8SOIC     8SOIC     8SOIC     8SOIC    
0.98 | 1ku     1.21 | 1ku     1.38 | 1ku     0.98 | 1ku     1.21 | 1ku     1.38 | 1ku    

Other qualified versions of ISO7220A

Version Part Number Definition
Automotive ISO7220A-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects

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