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 ISO7220x and ISO7221x devices are dual-channel digital isolators. To facilitate PCB layout, the channels are oriented in the same direction in the ISO7220x and in opposite directions in the ISO7221x. 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 and isolate grounds, as well as 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). The A-option, B-option, 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.

The ISO7220x and ISO7221x 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.

The ISO7220x and ISO7221x 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
    and Figure 22)
  • VDE Basic Insulation with 4000-VPK VIOTM, 560
    VPK VIORM per DIN V VDE V 0884-10 (VDE V
    0884-10):2006-12 and DIN EN 61010-1 (VDE
  • 2500 VRMS Isolation per UL 1577
  • CSA Approved for Component Acceptance Notice
    5A and IEC 60950-1

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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 Working Voltage (Vpk)
Number of Channels (#)
Forward/Reverse Channels
Supply Voltage(s) (V)
Default Output
TTL/CMOS Input Threshold
Propagation Delay (ns)
Operating Temperature Range (C)
ISO7220A ISO7220C ISO7220M ISO7221A ISO7221C ISO7221M
2500    2500    2500    2500    2500    2500   
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   
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   

Other qualified versions of ISO7220A

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