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STMicroelectronics 74AC74MTR
- Part No.:
- 74AC74MTR
- Manufacturer:
- STMicroelectronics
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74AC74MTR.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,250
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Product details
Overview
74AC74MTR from STMicroelectronics is a dual D-type flip-flop with asynchronous preset and clear, designed for high-speed synchronous logic in industrial control and data acquisition systems. It operates from 2V to 6V, delivers 300MHz typical maximum clock frequency at 5V, features symmetrical 24mA output drive, and supports 50Ω transmission line driving with balanced tPLH/tPHL propagation delays.
For engineers reviewing the 74AC74MTR datasheet, 74AC74MTR pinout, 74AC74MTR application, or 74AC74MTR equivalent, key selection criteria include its dual-edge-triggered D-flip-flop architecture, guaranteed 5.0ns propagation delay at 5V, ±24mA output capability, -55°C to +125°C operating range, and TSSOP-14 package compatibility with space-constrained PCB layouts.
Technical Context
The 74AC74MTR implements two independent edge-triggered D-type flip-flops with fully asynchronous active-low preset (PR) and clear (CLR) inputs. Each flip-flop transfers the D-input state to Q and Q̅ outputs on the rising edge of CK, with setup/hold times as low as 3.0ns/2.0ns (5V).
Its C2MOS sub-micron silicon gate process enables low ICC of 2µA max at 25°C while sustaining 300MHz operation, and integrated ESD protection provides 2kV HBM immunity. Input thresholds are rail-proportional (28% VCC min noise immunity), and output impedance is matched for clean 50Ω line driving.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - supports mixed-voltage system interfacing and battery-backed operation |
| fMAX (Typ.) | 300MHz at VCC = 5V - enables high-throughput data latching in real-time control loops |
| tPLH / tPHL | 5.0ns (5V, CL=50pF) - ensures precise timing alignment between dual flip-flops |
| IOL / IOH | ±24mA min - drives 50Ω transmission lines directly without external buffers |
| VNIH / VNIL | 28% VCC min - provides robust noise margin against digital crosstalk in noisy environments |
| ICC (Max) | 2µA at TA = 25°C - enables ultra-low static power in always-on monitoring circuits |
| Operating Temp | -55°C to +125°C - qualified for under-hood automotive and industrial motor control applications |
Pinout & Package
TSSOP-14 package: 4.9mm × 6.4mm body, 0.65mm pitch, thin-profile surface-mount construction optimized for automated assembly and thermal performance in dense layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13 | 1CLR, 2CLR | Asynchronous active-low reset - forces Q = 0, Q̅ = 1 independent of clock |
| 2, 12 | 1D, 2D | Data input - sampled on rising edge of corresponding clock signal |
| 3, 11 | 1CK, 2CK | Clock input - positive-edge triggered; determines sampling instant for D-to-Q transfer |
| 4, 10 | 1PR, 2PR | Asynchronous active-low set - forces Q = 1, Q̅ = 0 independent of clock |
| 5, 9 | 1Q, 2Q | True output - reflects stored D value after clock edge, with 24mA drive strength |
| 6, 8 | 1Q̅, 2Q̅ | Inverted output - complementary to Q, matched delay and drive capability |
| 7 | GND | Ground reference - return path for all internal logic and I/O currents |
| 14 | VCC | Positive supply - powers core logic and output drivers; decoupling required per pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent flip-flops | Enables compact implementation of 2-bit registers or synchronized dual-channel sampling |
| Rail-proportional input thresholds | 28% VCC noise immunity ensures reliable operation across full 2–6V supply range |
| 50Ω transmission line drive | Eliminates need for external series termination resistors in high-speed interconnects |
| Sub-micron C2MOS process | Delivers 300MHz speed with only 2µA quiescent current - critical for low-power edge nodes |
| 2kV HBM ESD protection | Reduces risk of field failure during handling and board-level integration |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Latching sensor status (e.g., door open/closed, seatbelt buckle) before CAN message framing. IC Role / Device Role / Timing Role: Dual D-flip-flop synchronizes asynchronous mechanical switch inputs to the microcontroller's clock domain. Use Value: Prevents metastability-induced glitches using guaranteed 2.0ns hold time and -55°C to +125°C operation. | Use Scenario: Capturing pulse-width modulated signals from HVAC actuators or window lift motors. IC Role / Device Role / Timing Role: Edge-triggered storage element captures rising/falling edges for duty-cycle measurement. Use Value: 5.0ns propagation delay and 300MHz fMAX enable accurate capture of fast PWM transitions up to 150kHz. |
| Test Equipment Digital Pattern Generators | Medical Infusion Pump Controllers |
Use Scenario: Generating deterministic multi-phase clock sequences for stimulus generation in ATE systems. IC Role / Device Role / Timing Role: Dual flip-flop used as a 2-bit shift register stage to sequence test vectors. Use Value: Symmetrical tPLH/tPHL (≤0.5ns skew) ensures phase-aligned outputs critical for timing-sensitive pattern generation. | Use Scenario: Debouncing and synchronizing emergency stop button inputs in Class II medical devices. IC Role / Device Role / Timing Role: Asynchronous preset/clear enables immediate hardware-level fault response independent of MCU state. Use Value: Active-low PR/CLR pins allow direct connection to safety-rated switches with fail-safe assertion at power-up. |
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 |
|---|---|---|---|
| SN74AC74PWR | TI part in TSSOP-14; identical AC/DC specs but different VIL/VIH thresholds (20%/80% VCC vs. ST's 28% VCC) | Slightly lower noise margin at low VCC; same 300MHz fMAX and -40°C to +85°C temp grade | Preferred for TI-centric BOMs or where tighter input threshold tolerance is required |
| 74LVC74AD,118 | Nexperia part in SO-14; 3.3V-only operation (1.65–3.6V), lower ICC (1µA), but reduced fMAX (200MHz typ.) | Limited to 3.3V systems; lacks extended temperature range (-40°C to +125°C only) | Selected when cost-sensitive 3.3V designs prioritize ultra-low static power over speed or wide temp range |
Compared with SN74AC74PWR and 74LVC74AD,118, the 74AC74MTR uniquely combines 2–6V operation, -55°C to +125°C qualification, and 300MHz speed - making it optimal for ruggedized industrial and automotive subsystems requiring voltage flexibility and extreme environmental resilience.
Availability
74AC74MTR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and medical infusion pump controllers requiring stable component supply across extended temperature and voltage ranges.
Supply support for 74AC74MTR 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, specializing in automotive, industrial, and power management ICs with strong analog and mixed-signal design expertise.
The 74AC logic family targets high-speed, low-power digital interface and synchronization functions in harsh-environment applications where reliability and wide supply range are essential.
FAQ
What is the minimum recommended VCC for reliable operation of the 74AC74MTR?
The 74AC74MTR is specified for operation down to 2.0V VCC across its full temperature range. At 2.0V, DC parameters including VIH (min 0.9V), VOL (max 0.5V at 12mA), and fMAX (90MHz min) remain guaranteed per the datasheet's recommended operating conditions table. Operation below 2.0V is not characterized and may result in undefined behavior or increased propagation delay.
Can the 74AC74MTR be used with 3.3V logic systems?
Yes - the 74AC74MTR is fully compatible with 3.3V systems. Its VCC range (2V–6V) includes 3.3V, and its input thresholds scale with VCC (VIH min = 2.25V at 3.3V, VIL max = 1.35V). Output VOH/VOL meet 3.3V LVTTL requirements, and propagation delay is 7.0ns typical at 3.3V, enabling seamless integration into mixed-voltage designs without level shifters.
How does the 74AC74MTR handle simultaneous assertion of PRESET and CLEAR?
When both PRESET (PR) and CLEAR (CLR) are asserted low simultaneously, the outputs enter a metastable state per the truth table's "L L X X H H" row - meaning Q = 1 and Q̅ = 1. This violates the normal complementary relationship. The device resolves this upon release of either input, with priority determined by internal race conditions - therefore simultaneous assertion must be avoided in functional designs.
Is the 74AC74MTR pin-compatible with standard 74LS74 or 74HC74 devices?
Yes - the 74AC74MTR is pin- and function-compatible with industry-standard 74-series dual D-flip-flops including 74LS74 and 74HC74. Pin numbering, logic symbols, and truth table behavior (including asynchronous PR/CLR) match exactly. However, AC74 offers higher speed (300MHz vs. ~30MHz for LS74), lower power, and wider VCC range than LS74 or HC74, requiring attention to decoupling and layout for optimal high-frequency performance.
74AC74MTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74AC
- Package/Case:
- 14-SOIC (0.154", 3.90mm 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:
- 300 MHz
- Max Propagation Delay @ V, Max CL:
- 10ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 2 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOP
74AC74MTR FAQ
1.How can I place an order for 74AC74MTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC74MTR 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 74AC74MTR reliable?
The price and inventory of 74AC74MTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC74MTR is usually 5 days.
3.What payment methods are accepted for 74AC74MTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC74MTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC74MTR?
74AC74MTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC74MTR 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 74AC74MTR?
For technical support, including 74AC74MTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC74MTR requirements.
6.How does Aetrix verify that 74AC74MTR is sourced from the original manufacturer or authorized distributors?
All 74AC74MTR 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 74AC74MTR meets industry standards.
7.What is the process for return or replacement of 74AC74MTR?
All 74AC74MTR units undergo pre-shipment inspection (PSI). If there is an issue with 74AC74MTR, 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 74AC74MTR part is unused and in its original packaging.
Return procedure for 74AC74MTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74AC74MTR Tags
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