Octal bus switch with quad output enables

The CBT3244A provides eight bits of high-speed TTL-compatible bus switching in a standard '244 device pinout. The low ON-state resistance of the switch allows connections to be made with minimal propagation delay. The CBT3244A device is organized as two 4-bit low-impedance switches with separate output-enable (OE) inputs. When OE is LOW, the switch is on and data can flow from port A to port B, or vice versa. When OE is HIGH, the switch is open and high-impedance state exists between the two ports. The CBT3244A is characterized for operation from -40 °C to +85 °C.


  • Standard '244-type pinout
  • 5 Ω switch connection between two ports
  • TTL compatible control input levels
  • Package options include:
    • plastic small outline (SO20)
    • shrink small outline (SSOP20)
    • shrink small outline, QSOP (SSOP20)
    • thin shrink small outline (TSSOP20)
    • depopulated heatsink very thin quad flat package, no leads (DHVQFN20)
  • Latch-up protection exceeds 500 mA per JESD78
  • ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101

Target applications


Type numberProduct statusVCC (V)VPASS (V)Logic switching levelsRON (Ohm)f(-3dB) (MHz)No of bitstpd (ns)Power dissipation considerationsTamb (Cel)Rth(j-a) (K/W)Ψth(j-top) (K/W)Rth(j-c) (K/W)Package name
CBT3244ADProduction4.5 - 5.53.9TTL730080.25very Low-40~858527.261SO20


Type numberPackageOutline versionReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
SOT163-1Reel 13" Q1/T1ActiveCBT3244ADCBT3244AD,118
( 9352 759 99118 )
Bulk PackActiveCBT3244ADCBT3244AD,112
( 9352 759 99112 )

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateMSLMSL leadfree
CBT3244ADCBT3244AD,118CBT3244ADAlways Pb-free11
CBT3244ADCBT3244AD,112CBT3244ADAlways Pb-free11
Quality and reliability disclaimer

Documentation (3)

File nameTitleTypeDate
CBT3244AOctal bus switch with quad output enablesData sheet2017-09-08
SOT163-1_118SO20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118Packing2013-04-15
SOT163-1plastic, small outline package; 20 leads; 1.27 mm pitch; 12.8 mm x 7.5 mm x 2.65 mm bodyOutline drawing2017-01-30


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