CMOS Quad Low-to-High Voltage Level Shifter (20V Rating) - CD40109B


CMOS Quad Low-to-High Voltage Level Shifter (20V Rating)



CD40109B contains four low-to-high-voltage level-shifting circuits. Each circuit will shift a low-voltage digital-logic input signal (A, B, C, D) with logical 1 = VCC and logical 0 = VSS to a higher-voltage output signal (E, F, G, H) with logical 1 = VDD and logical 0 = VSS.

The CD40109, unlike other low-to-high level-shifting circuits, does not require the presence of the high-voltage supply (VDD) before the application of either the low-voltage supply (VCC) or the input signals. There are no restrictions on the sequence of application of VDD, VCC, or the input signals. In addition, with one exception there are no restrictions on the relative magnitudes of the supply voltages or input signals within the device maximum ratings, provided that the input signal swings between VSS and at least 0.7 VCC; VCC may exceed VDD, and input signals may exceed VCC and VDD. When operated in the mode VCC > VDD, the CD40109 will operate as a high-to-low level-shifter.

The CD40109 also features individual three-state output capability. A low level on any of the separately enabled three-state output controls produces a high-impedance state in the corresponding output.

The CD40109B-Series types are supplied in 16-lead ceramic dual-in-line packages (F3A suffix), 16-lead dual-in-line plastic packages (E suffix), 16-lead small-outline packages (NSR suffix), and 16-lead thin shrink small-outline packages (PW and PWR suffixes).


  • Independence of power supply sequence considerations - VCC can exceed VDD, input signals can exceed both VCC and VDD
  • Up and down level-shifting capability
  • Three-state outputs with separate enable controls
  • Standardized, symmetrical output characteristics
  • 100% tested for quiescent current at 20 V
  • Maximum input current of 1 uA at 18 V over full package-temperature range; 100 nA at 18 V and 25°C
  • Noise margin (full package-temperature range):
       = 1 V at VCC = 5 V, VDD = 10 V
       = 2 V at VCC = 10 V, VDD = 15 V
  • 5-V, 10-V, and 15-V parametric ratings
  • Meets all requirements of JEDEC Tentative Standard No. 13B, "Standard Specifications for Description of 'B' Series CMOS Devices"
  • Applications:
    • High-or-low level-shifting with three-state outputs for unidirectional or bidirectional bussing.
    • Isolation of logic subsystems using separate power supplies from supply sequencing, supply loss and supply regulation considerations

Data sheet acquired from Harris Semiconductor

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Other qualified versions of CD40109B

Version Part Number Definition
Military CD40109B-MIL QML certified for Military and Defense Applications
Automotive CD40109B-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects

Parametrics Compare all products in Unidirectional Voltage Translation

Technology Family
Bits (#)
VCC (Min) (V)
VCC (Max) (V)
Voltage (Nom) (V)
F @ Nom Voltage (Max) (Mhz)
ICC @ Nom Voltage (Max) (mA)
Output Drive (IOL/IOH) (Max) (mA)
Schmitt Trigger
tpd @ Nom Voltage (Max) (ns)
Operating Temperature Range (C)
CD40109B CD40109B-MIL CD40109B-Q1
CD4000    CD4000    CD4000   
4    4    4   
3      3   
18      18   
50      50   
0.001      0.001   
4.2/-4.2      4/-4   
No    No    No   
100    600    600   
Catalog    Military    Automotive   
-55 to 125    -55 to 125    -40 to 125