3.3 V octal D-type transparent latch; 3-state

The 74LVT573 is a high-performance BiCMOS product designed for VCC operation at 3.3 V. This device is an octal transparent latch coupled to eight 3-state output buffers. The two sections of the device are controlled independently by Latch Enable (LE) and Output Enable (OE) control gates. The 74LVT573 has a broadside pinout configuration to facilitate PC board layout and allow easy interface with microprocessors.

The data on the Dn inputs are transferred to the latch outputs when the Latch Enable (LE) input is High. The latch remains transparent to the data inputs while LE is High, and stores the data that is present one setup time before the High-to-Low enable transition.

The 3-state output buffers are designed to drive heavily loaded 3-state buses, MOS memories, or MOS microprocessors. The active-Low Output Enable (OE) controls all eight 3-state buffers independent of the latch operation.

When OE is Low, the latched or transparent data appears at the outputs. When OE is High, the outputs are in the High-impedance “OFF” state, which means they will neither drive nor load the bus.

Orderable parts

Type number Orderable part number Ordering code (12NC) Package Buy from distributors
74LVT573BQ 74LVT573BQ,115 935285607115 SOT764-1 Order product


  • Inputs and outputs arranged for easy interfacing to microprocessors
  • 3-state outputs for bus interfacing
  • Common output enable control
  • TTL input and output switching levels
  • Input and output interface capability to systems at 5 V supply
  • Bus hold data inputs eliminate need for external pull-up resistors to hold unused inputs
  • Live insertion and extraction permitted
  • No bus current loading when output is tied to 5 V bus
  • Power-up reset
  • Power-up 3-state
  • Latch-up protection
    • JESD78 class II exceeds 500 mA
  • ESD protection:
    • HBM JESD22-A114E exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 V
  • Specified from -40 °C to +85 °C

Target applications


Type numberProduct statusVCC (V)Logic switching levelsOutput drive capability (mA)tpd (ns)No of bitsPower dissipation considerationsTamb (Cel)Rth(j-a) (K/W)Ψth(j-top) (K/W)Rth(j-c) (K/W)Package name
74LVT573BQProduction2.7 - 3.6TTL-32/+642.78medium-40~85778.649DHVQFN20


Type numberOrderable part number, (Ordering code (12NC))StatusMarkingPackageOutline versionReflow-/Wave solderingPacking
( 9352 856 07115 )
SOT764-1Reel 7" Q1/T1

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
74LVT573BQ74LVT573BQ,11574LVT573BQAlways Pb-free70.81.337.52E811
Quality and reliability disclaimer

Documentation (5)

File nameTitleTypeDate
74LVT5733.3 V octal D-type transparent latch; 3-stateData sheet2017-05-04
lvt573lvt573 IBIS modelIBIS model2013-04-07
lvtlvt Spice modelSPICE model2013-05-06
SOT764-1_115DHVQFN20; Reel pack; SMD, 7" Q1/T1 Standard product orientation Orderable part number ending ,115 or X Ordering code (12NC) ending 115Packing2013-04-23
SOT764-1plastic, leadless dual in-line compatible thermal enhanced very thin quad flat package; 20 terminals; 0.5 mm pitch; 4.5 mm x 2.5 mm x 1 mm bodyOutline drawing2018-11-14


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File nameTitleTypeDate
lvt573lvt573 IBIS modelIBIS model2013-04-07
lvtlvt Spice modelSPICE model2013-05-06

Ordering, pricing & availability

Type numberOrderable part numberOrdering code (12NC)PackingBuy online
74LVT573BQ74LVT573BQ,115935285607115Reel 7" Q1/T1Order product


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