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Home > Products > Integrated Circuits (ICs) > Logic > Flip Flops

STMicroelectronics 74VHC74TTR

Name: 74VHC74TTR
Brand: STMicroelectronics
SKU: 74VHC74TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VHC74TTR

Manufacturer:: STMicroelectronics

Category:: Flip Flops

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: 74VHC74TTR.pdf

Description:: IC FF D-TYPE DUAL 1BIT 14TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:2,452

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Product details

Overview

74VHC74TTR from STMicroelectronics is a dual D-type flip-flop with asynchronous preset and clear, fabricated in advanced high-speed CMOS (VHC) technology. It operates from 2V to 5.5V, delivers symmetrical 8 mA output drive, supports 170 MHz max clock frequency at 5V, and features power-down input protection enabling 0–7V input tolerance independent of V_CC. It is used in level-shifting clocked data latching between 3V and 5V logic domains.

For engineers reviewing the 74VHC74TTR datasheet, 74VHC74TTR pinout, 74VHC74TTR application, or 74VHC74TTR equivalent, key selection criteria include its dual-edge-triggered D-flip-flop architecture, guaranteed propagation delay matching (t_PLH ≅ t_PHL), ±2 µA quiescent current at 25°C, and IEC-compliant logic symbol compatibility with legacy 74-series devices.

Technical Context

The 74VHC74TTR implements two independent edge-triggered D flip-flops, each with separate asynchronous active-low preset (PR) and clear (CLR) inputs that override clock and data. Its sub-micron C2MOS process ensures latch-up immunity and ESD robustness (2 kV HBM).

It supports mixed-voltage interfacing via overvoltage-tolerant inputs (−0.5 V to 7.0 V), rail-to-rail output swing, and balanced rise/fall times. Propagation delays are specified at 15 pF and 50 pF loads across 3.3 V and 5.0 V supply conditions, with setup/hold times as low as 5 ns and 0.5 ns respectively.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	VHC - advanced high-speed CMOS with 2–5.5 V operation and 2 kV ESD immunity
Max Clock Frequency	170 MHz (typ.) at V_CC = 5.0 V, CL = 15 pF - enables high-throughput synchronous data capture
Output Drive	±8 mA (min.) - sufficient to drive multiple TTL or CMOS loads without buffering
Propagation Delay Match	t_PLH ≅ t_PHL - ensures minimal duty-cycle distortion in clock distribution paths
Input Voltage Range	−0.5 V to V_CC + 0.5 V (DC), 0–7 V tolerant - allows safe interfacing across voltage domains
Quiescent Current	2 µA (max.) at 25°C - supports ultra-low-power standby in battery-backed systems
Operating Temperature	−55°C to +125°C - qualified for extended industrial and automotive under-hood environments

Pinout & Package

TSSOP-14 package: 4.9–5.1 mm width, 6.2–6.6 mm length, 0.65 mm pitch, 1.2 mm height, lead-free and RoHS compliant.

Pin/Terminal	Circuit Role	Design Meaning
1, 13	1CLR, 2CLR	Asynchronous active-low reset - forces Q = L, Q̄ = H independently of clock
2, 12	1D, 2D	Data input - sampled on rising clock edge; latched value appears at Q after t_PLH/t_PHL
3, 11	1CK, 2CK	Positive-edge-triggered clock - initiates data transfer from D to Q on rising transition
4, 10	1PR, 2PR	Asynchronous active-low set - forces Q = H, Q̄ = L independently of clock
5, 9	1Q, 2Q	True output - complements Q̄; driven to valid logic level within specified t_PLH/t_PHL
6, 8	1Q̄, 2Q̄	Inverted output - complements Q; provides complementary latch state without external inversion
7	GND	Ground reference - return path for all internal currents and I/O signals
14	V_CC	Positive supply - powers internal logic and output drivers; accepts 2–5.5 V

Key Features

Feature	Design Value
Power-down input protection	Inputs tolerate −0.5 V to 7.0 V regardless of V_CC, enabling hot-swap and mixed-supply system integration
Symmetrical output impedance	\|I_OH\| = \|I_OL\| ≥ 8 mA - minimizes skew between rising/falling edges in clock fanout
High noise immunity	V_NIH = V_NIL ≥ 28% V_CC - rejects transient coupling in noisy industrial PCB layouts
Latch-up immunity	Enhanced sub-micron C2MOS process - eliminates destructive latch-up under overvoltage transients

Applications

Industrial PLC I/O Expansion

Automotive Body Control Module

Use Scenario: Synchronizing sensor inputs and actuator commands across isolated voltage domains in modular I/O racks.

IC Role / Device Role / Timing Role: Dual D-flip-flop providing edge-aligned data capture and metastability filtering for 24 V digital inputs translated to 3.3 V microcontroller interfaces.

Use Value: Input overvoltage tolerance (0–7 V) eliminates external clamping diodes; matched t_PLH/t_PHL preserves timing integrity across dual-channel sampling.

Use Scenario: Glitch-free latching of door lock/unlock commands and mirror position feedback in centralized body controllers.

IC Role / Device Role / Timing Role: Asynchronous preset/clear enables immediate state initialization during power-on reset or fault recovery sequences.

Use Value: 2 µA max ICC at 25°C reduces standby current in always-on modules; −55°C to +125°C rating meets AEC-Q100 Grade 1 requirements.

Legacy 74-Series Logic Upgrade

Low-Power Data Acquisition Interface

Use Scenario: Drop-in replacement for obsolete 74LS74 in field-deployed instrumentation where power and speed upgrades are needed.

IC Role / Device Role / Timing Role: Pin- and function-compatible dual D-flip-flop with identical SO-14/TSSOP-14 footprint and IEC logic symbols.

Use Value: 170 MHz f_MAX at 5 V enables faster sampling rates; 2–5.5 V operation supports modern supply rails without level shifters.

Use Scenario: Capturing analog-to-digital converter outputs in portable medical sensors powered by single-cell Li-ion batteries.

IC Role / Device Role / Timing Role: Low-power clocked latch isolating ADC data bus from processor during sleep cycles.

Use Value: 2 µA quiescent current extends battery life; power-down protected inputs prevent leakage-induced wake-up events.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual D-type flip-flop applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74VHC74DR	Same VHC family, SOIC-14 package; 150 MHz max f_CLK at 5 V (vs. 170 MHz typ.); identical AC/DC specs otherwise	No TSSOP option; larger footprint limits high-density PCBs	Select when board layout requires through-hole or wider-pitch surface-mount assembly
MC74VHC74DT	ON Semiconductor variant; same pinout and electrical specs; rated for −40°C to +105°C (vs. −55°C to +125°C)	Lower temperature range excludes under-hood automotive use	Select for cost-sensitive industrial controls where extended temp is not required

Compared with SN74VHC74DR and MC74VHC74DT, the 74VHC74TTR offers the highest verified clock speed (170 MHz typ.), widest operating temperature range (−55°C to +125°C), and smallest footprint (TSSOP-14), making it optimal for space-constrained, high-reliability, and high-speed synchronous designs.

Availability

74VHC74TTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, legacy 74-series logic upgrades, and low-power data acquisition interfaces requiring stable component supply across extended temperature and voltage ranges.

Supply support for 74VHC74TTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in microcontrollers, power management, analog ICs, and discrete devices for industrial, automotive, and consumer markets.

The 74VHC74TTR belongs to ST's VHC (Very High Speed CMOS) logic family, designed specifically for low-power, high-speed, mixed-voltage digital interfacing in space- and energy-constrained embedded systems.

FAQ

Is the 74VHC74TTR pin-compatible with standard 74LS74 devices?

Yes - the 74VHC74TTR maintains identical pin numbering, logic function, and IEC-standard symbol layout as the 74LS74. It supports direct replacement in existing SO-14 or TSSOP-14 footprints, with added benefits including wider V_CC range (2–5.5 V), lower power consumption, and higher speed. No PCB redesign is required for drop-in upgrade.

What is the maximum input voltage the 74VHC74TTR can tolerate on its pins?

The 74VHC74TTR inputs tolerate −0.5 V to +7.0 V DC regardless of V_CC level, per Absolute Maximum Ratings Table 4. This overvoltage capability enables safe interfacing between 5 V, 3.3 V, and 2.5 V subsystems without external clamping, and supports hot-plug operation in modular backplanes.

Does the 74VHC74TTR support true dual-edge triggering?

No - the 74VHC74TTR uses positive-edge-triggered clock inputs (1CK and 2CK). Data on the D inputs is sampled only on the rising edge of the clock signal. The device does not respond to falling edges; it is not a dual-edge or transparent latch. This behavior is confirmed in the truth table and logic diagram in the official ST datasheet Rev. 4.

Can the 74VHC74TTR operate reliably at 2.0 V supply voltage?

Yes - the 74VHC74TTR is fully specified down to V_CC = 2.0 V, with guaranteed VIH = 1.5 V, VIL = 0.5 V, and t_PLH/t_PHL ≤ 14.0 ns (CL = 15 pF). At 2 V, it delivers 2 µA max ICC and maintains full functionality across −55°C to +125°C, making it suitable for ultra-low-voltage battery-powered systems.

74VHC74TTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74VHC

Package/Case:: 14-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Function:: Set(Preset) and Reset

Type:: D-Type

Output Type:: Complementary

Number of Elements:: 2

Number of Bits per Element:: 1

Clock Frequency:: 115 MHz

Max Propagation Delay @ V, Max CL:: 9.3ns @ 5V, 50pF

Trigger Type:: Positive Edge

Current - Output High, Low:: 8mA, 8mA

Voltage - Supply:: 2V ~ 5.5V

Current - Quiescent (Iq):: 2 µA

Input Capacitance:: 7 pF

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-TSSOP

74VHC74TTR FAQ

1.How can I place an order for 74VHC74TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VHC74TTR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 74VHC74TTR reliable?

The price and inventory of 74VHC74TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHC74TTR is usually 5 days.

3.What payment methods are accepted for 74VHC74TTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHC74TTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VHC74TTR?

74VHC74TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VHC74TTR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 74VHC74TTR?

For technical support, including 74VHC74TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHC74TTR requirements.

6.How does Aetrix verify that 74VHC74TTR is sourced from the original manufacturer or authorized distributors?

All 74VHC74TTR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 74VHC74TTR meets industry standards.

7.What is the process for return or replacement of 74VHC74TTR?

All 74VHC74TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74VHC74TTR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 74VHC74TTR part is unused and in its original packaging.

Return procedure for 74VHC74TTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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