74VHC373MTCX - Octal D-Type Latch, 3-STATE, TSSOP-20 | onsemi
MPN: 74VHC373MTCX ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.61 | $0.61 |
| 10 | $0.55 | $5.50 |
| 100 | $0.43 | $43.00 |
| 500 | $0.36 | $180.00 |
| 1,000 | $0.32 | $320.00 |
| 2,500 | $0.29 | $725.00 |
74VHC373MTCX Overview
A D-type transparent latch is a sequential logic element that captures data on its D inputs when the latch-enable signal is asserted, and holds that data on the Q outputs when LE is de-asserted. The 3-STATE outputs allow multiple devices to share a common bus, controlled by the OE pin. In the broader system hierarchy, the 74VHC373 belongs to the 74VHC logic family of high-speed CMOS logic, itself part of the larger CMOS logic IC family used for glue logic, bus buffering, and address/data demultiplexing in digital systems.
Key specifications include a wide 2.0 V to 5.5 V VCC operating range, typical propagation delay of approximately 5 ns at 5 V, low quiescent current, and high output drive capability. The output structure is non-inverting, making it well suited to bus-driving applications where input and output polarities must match. An internal static-guard design provides ESD protection on every input and output pin.
Typical applications include address/data bus demultiplexing in microcontroller and microprocessor systems, bus arbitration and bidirectional buffering, register file building blocks, I/O port expansion, and general-purpose storage elements in digital logic designs. The TSSOP-20 footprint makes it attractive for compact, surface-mount assemblies where board space is constrained.
When designing with this part, ensure that the OE pin is correctly driven to avoid bus contention when multiple 74VHC373 devices share a common output bus. Decoupling the VCC pin with a 0.1 µF ceramic capacitor placed within a few millimeters of the package is recommended for reliable high-speed operation.
This page synthesizes distributor pricing, verified cross-reference drop-in alternatives, and practical design notes beyond what is presented in the manufacturer datasheet.
Drop-in alternatives for 74VHC373MTCX — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with 74VHC373MTCX (same form factor and footprint) — differing in Input Type, Logic Family, Number of Channels, Operating Temperature, Output Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
74VHC373MTC
✅ Drop-In📋 Reference alternative (not in catalog)
MC74VHC373DTR2G
✅ Drop-In📋 Reference alternative (not in catalog)
SN74AHC373PWG4
✅ Drop-In📋 Reference alternative (not in catalog)
74VHC373MTCX Maximum Ratings & Electrical Characteristics
| Logic Type | D-Type Transparent Latch |
| Number of Channels | 1 |
| Number of Bits per Channel | 8 |
| Output Configuration | 3-State (Tri-State) |
| Output Type | Non-Inverting |
| Latch Type | Transparent D-Type |
| VCC Supply Range | 2.0 V to 5.5 V |
| Logic Family | 74VHC (High-Speed CMOS) |
| Input Type | CMOS |
| Operating Temperature | -40 °C to +85 °C |
| Mounting Type | Surface Mount |
| Package | 20-TSSOP (MTC), 4.40 mm body width |
| RoHS Status | Compliant |
| Lead-Free | Yes |
74VHC373MTCX Pin Configuration
| Pin 1 | OE — Output Enable (active LOW for 3-STATE outputs; HIGH = outputs high-impedance) |
| Pin 2 | D0 — Data input bit 0 |
| Pin 3 | D1 — Data input bit 1 |
| Pin 4 | D2 — Data input bit 2 |
| Pin 5 | D3 — Data input bit 3 |
| Pin 6 | D4 — Data input bit 4 |
| Pin 7 | D5 — Data input bit 5 |
| Pin 8 | D6 — Data input bit 6 |
| Pin 9 | D7 — Data input bit 7 |
| Pin 10 | GND — Ground reference |
| Pin 11 | LE — Latch Enable (active HIGH; data flows D to Q while HIGH, held when LOW) |
| Pin 12 | Q0 — Latch output bit 0 (3-STATE) |
| Pin 13 | Q1 — Latch output bit 1 (3-STATE) |
| Pin 14 | Q2 — Latch output bit 2 (3-STATE) |
| Pin 15 | Q3 — Latch output bit 3 (3-STATE) |
| Pin 16 | Q4 — Latch output bit 4 (3-STATE) |
| Pin 17 | Q5 — Latch output bit 5 (3-STATE) |
| Pin 18 | Q6 — Latch output bit 6 (3-STATE) |
| Pin 19 | Q7 — Latch output bit 7 (3-STATE) |
| Pin 20 | VCC — Power supply (2.0 V to 5.5 V) |
Typical Applications
74VHC373MTCX is suitable for 6 applications: Microprocessor Address/Data Bus Demultiplexing, Bus Arbitration and Bidirectional Buffering, I/O Port Expansion, Register File Building Block, Industrial Control Logic, Test and Measurement Equipment.
Microprocessor Address/Data Bus Demultiplexing
The 74VHC373MTCX is a classic building block for demultiplexing the multiplexed address/data bus of 80C31/8051 microcontrollers and similar processors. The 8-bit transparent latch captures the low-byte address on D0-D7 when LE is asserted during the ALE cycle, then holds that address on the Q0-Q7 outputs for the remainder of the bus cycle so the processor can use the bus for data transfer. The 3-STATE OE control allows the latch outputs to be released when an external memory device takes over the bus, preventing contention. Operating from 2.0 V to 5.5 V, the device works seamlessly with both 5 V 8051 systems and 3.3 V modern microcontrollers. The CMOS low-power dissipation reduces overall system current draw compared to legacy bipolar 74LS373 designs, while matching TTL-compatible switching speeds.
Recommended
Bus Arbitration and Bidirectional Buffering
The 74VHC373MTCX serves as a unidirectional 8-bit latch in bidirectional bus architectures where multiple masters must arbitrate for shared resources. By connecting the OE pins of multiple 74VHC373 devices to arbitration logic, only one source drives the shared bus at any time. The transparent latch function isolates the held value from upstream bus transients during read cycles, improving signal integrity on heavily loaded buses. The wide VCC range (2.0-5.5 V) supports mixed-voltage systems where legacy 5 V peripherals share a 3.3 V processor bus. The TSSOP-20 package provides compact routing in dense backplane designs where multiple parallel latches must fit adjacent to connector pins.
Recommended
I/O Port Expansion
For microcontroller designs needing additional output ports without integrated peripherals, the 74VHC373MTCX provides 8 bits of latched output expansion through just three control pins (LE, OE, D-input). The micro writes data to the latch via a GPIO port, strobes LE briefly to capture, and the 74VHC373MTCX holds the output state indefinitely. This pattern is widely used in LED driving, relay control, and parallel LCD interface circuits. The 3-STATE OE control lets the expansion port be electrically disconnected when not in use, eliminating bus contention during shared peripheral access. Compared to shift-register expansion (e.g., 74HC595), the parallel latch interface is faster for simultaneous 8-bit updates, at the cost of using more GPIO pins.
Recommended
Register File Building Block
The 74VHC373MTCX functions as one byte of a register file when multiple devices are cascaded or arranged with external decoding. Designers use the device to build small general-purpose register banks for DSP, FPGA glue logic, or custom state machines. The transparent latch captures data on the rising edge of LE, then holds it on Q outputs; this acts as an edge-triggered register when LE is driven by a clock edge. Combined with an external decoder (such as 74HCT154BQ), multiple 74VHC373 latches can be selected individually for read/write operations, creating indexed register files of arbitrary depth.
Recommended
Industrial Control Logic
In industrial automation systems, the 74VHC373MTCX interfaces control logic signals to actuator drivers and indicator panels. The wide operating temperature range of -40 °C to +85 °C supports factory floor environments, while the 5.5 V tolerant inputs accept long cable-driven signals without damage. The CMOS low quiescent current reduces power consumption in always-on industrial controllers. A typical configuration latches 8 bits of control state from a PLC CPU and drives opto-isolated actuator inputs downstream. The TSSOP-20 package saves PCB area in densely populated control boards where dozens of signal lines must be routed to terminal blocks.
Recommended
Test and Measurement Equipment
The 74VHC373MTCX captures and holds digital test patterns in automated test equipment (ATE), logic analyzers, and laboratory instrumentation. The transparent latch function, combined with the 3-STATE output, allows a stimulus vector to be applied to a device under test and then isolated after capture. Designers use multiple cascaded 74VHC373 devices to build long shift-register patterns for serial-to-parallel conversion in high-channel-count test systems. The low propagation delay through the latch preserves timing fidelity in sub-microsecond test sequences. The TSSOP-20 footprint suits compact probe cards and modular instrumentation where space is at a premium.
Recommended
Recommended Products Summary
Engineering reference data for 74VHC373MTCX — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 74VHC373MTC | MC74VHC373DTR2G | SN74AHC373PWG4 |
|---|---|---|---|---|
| Package | 20-TSSOP (MTC) | 20-TSSOP (MTC) - same | 20-TSSOP (DT) - same footprint | 20-TSSOP (PW) - same footprint |
| Brand | onsemi | onsemi - same | onsemi - same | Texas Instruments - cross-brand |
| Logic Function | Octal D-Type Transparent Latch | Octal D-Type Transparent Latch - identical | Octal D-Type Transparent Latch - identical | Octal D-Type Transparent Latch - identical |
| Logic Family | 74VHC (VHC) | 74VHC (VHC) - same | 74VHC (VHC) - same | 74AHC (AHC) - cross-family |
| Output Configuration | 3-State, non-inverting | 3-State, non-inverting - identical | 3-State, non-inverting - identical | 3-State, non-inverting - identical |
| VCC Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V - same | 2.0 V to 5.5 V - same | 2.0 V to 5.5 V - same |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C - same | -40 °C to +85 °C - same | -40 °C to +85 °C - same |
| Packaging Carrier | Tape & Reel (MTCX suffix) | Tube (MTC suffix) | Tape & Reel (DTR2 suffix) | Tape & Reel (G4 suffix) |
| Pin-to-Pin Compatible | Reference | Yes - identical pinout | Yes - same TSSOP-20 footprint | Yes - same TSSOP-20 footprint |
Key Differentiators
- Tube-packaging drop-in option with identical die (vs 74VHC373MTC)
- Same-brand alternative with verified pin-to-pin compatibility (vs MC74VHC373DTR2G)
- Cross-brand AHC-family option with same TSSOP-20 footprint (vs SN74AHC373PWG4)
Design Notes
Decouple the VCC pin (pin 20) with a 0.1 µF X7R ceramic capacitor placed within 5 mm of the package, plus a bulk 1-10 µF tantalum or electrolytic capacitor on the same VCC net. For multi-latch designs with several 74VHC373 devices sharing a VCC rail, add additional bulk capacitance to absorb simultaneous switching transients. The VHC family draws higher dynamic current during transitions than HC; the bulk cap prevents VCC droop when all 8 bits switch simultaneously.
Do not leave the OE pin (pin 1) floating; an undriven OE may sit at an intermediate voltage causing high quiescent current and unpredictable 3-STATE behavior. Tie OE to GND (LOW) for always-enabled outputs, or drive it from a defined logic source. Also note that LE (pin 11) is level-sensitive: while HIGH, the latch is transparent and Q follows D; only on the HIGH-to-LOW transition is the data latched. Designers intending edge-triggered behavior must ensure LE is a clean narrow pulse, not a slow ramp or noisy signal.
The TSSOP-20 package requires careful PCB layout to maintain signal integrity at high switching speeds. Keep data and output traces short and direct, with ground plane reference for impedance control. Avoid running high-frequency switching signals parallel to sensitive analog traces; the VHC family's ~5 ns edge rates can couple significant noise into nearby circuits. For bus-sharing applications, place the 74VHC373 outputs close to the bus connector and keep stub lengths minimal to reduce reflections.
Compliance Information
RoHS compliant and lead-free per onsemi product page and distributor listings. Not AEC-Q100 qualified - the 74VHC373MTCX is not designed for automotive applications. For automotive latch needs, look for AEC-Q100 qualified equivalents. Halogen-free status not explicitly stated in verified data.
