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STMicroelectronics 74AC02TTR
- Part No.:
- 74AC02TTR
- Manufacturer:
- STMicroelectronics
- Category:
- Gates and Inverters
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74AC02TTR.pdf
- Description:
- IC GATE NOR 4CH 2-INP 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,698
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Product details
Overview
74AC02TTR from STMicroelectronics is a quad 2-input NOR gate IC in TSSOP-14 package, operating at 2V–6V supply, with 4.2ns typical propagation delay at 5V, ±24mA symmetrical output drive, and 2µA max quiescent current at 25°C. It serves as a high-speed logic combinatorial element in digital control subsystems of industrial PLC I/O modules.
For engineers reviewing the 74AC02TTR datasheet, 74AC02TTR pinout, 74AC02TTR application, or 74AC02TTR equivalent, key selection criteria include transmission-line driving capability (50Ω), latch-up immunity, ESD tolerance (2kV), and compatibility with legacy 74-series logic families.
Technical Context
The 74AC02TTR implements four independent NOR gates using sub-micron C2MOS technology with three-stage buffered outputs, enabling stable switching and high noise immunity (28% VCC). Its symmetrical output impedance ensures matched tPLH/tPHL delays under load.
It supports incident-wave switching on 50Ω transmission lines and meets stringent industrial temperature range requirements (–55°C to +125°C), with input thresholds defined at 30–70% VCC and guaranteed dynamic output current up to ±75mA per output during transient events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - Enables interoperability across 3.3V and 5V logic domains without level shifters |
| tPD (Typ.) | 4.2ns at VCC = 5V - Supports >100MHz toggle rates in synchronous logic paths |
| IOL / IOH | ±24mA min - Drives 50Ω transmission lines directly with clean edge integrity |
| VNIH / VNIL | 28% VCC min - Provides robust noise margin against coupled transients in noisy industrial environments |
| ICC (Max) | 2µA at TA = 25°C - Enables ultra-low static power in battery-backed or always-on control logic |
| ESD Rating | 2kV HBM - Protects inputs during board handling and system integration without external clamping |
| Operating Temp | –55°C to +125°C - Qualified for under-hood automotive and industrial motor drive control applications |
Pinout & Package
TSSOP-14 (4.9 × 6.4 mm, 0.65 mm pitch) surface-mount package with exposed pad not electrically connected; moisture sensitivity level MSL3 per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | 1Y, 2Y, 3Y, 4Y | Active-low NOR gate outputs - Each capable of sourcing/sinking ≥24mA with matched rise/fall times |
| 2, 5, 8, 11 | 1A, 2A, 3A, 4A | First input per gate - TTL/CMOS-compatible thresholds; 2kV ESD protected |
| 3, 6, 9, 12 | 1B, 2B, 3B, 4B | Second input per gate - Independent of other gates; no internal coupling |
| 7 | GND | Dedicated ground reference - Shared return path for all four gates; low-inductance layout critical |
| 14 | VCC | Single positive supply - Powers all gates; decoupling capacitor required within 5mm |
Key Features
| Feature | Design Value |
|---|---|
| Pin- and function-compatible with 74LS02/74HC02 | Drop-in replacement for legacy designs without PCB or firmware changes |
| Improved latch-up immunity | Withstands transient overvoltage events without destructive parasitic thyristor activation |
| Symmetrical output drive | Ensures <100ps skew between tPLH and tPHL under matched 50Ω loads |
| 3-stage buffered output architecture | Reduces input loading effect and improves fan-out capability to ≥10 AC loads |
| Input protection diodes | Clamps fast transients to VCC/GND rails, limiting voltage excursion to ±0.5V beyond rails |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Logic-level signal conditioning for discrete sensor inputs (e.g., limit switches, door ajar sensors) before microcontroller sampling. IC Role / Device Role / Timing Role: NOR gate used as active-low enable combiner and noise-filtering stage prior to interrupt generation. Use Value: 28% VCC noise margin rejects EMI from solenoid drivers; 4.2ns delay preserves timing margins in 10kHz polling loops. | Use Scenario: Discrete fault detection logic in lighting control subsystems (e.g., headlamp short-circuit monitoring). IC Role / Device Role / Timing Role: Gate-level combinatorial logic implementing OR-of-faults with active-low reset coordination. Use Value: –55°C to +125°C rating ensures operation in engine bay enclosures; ±24mA drive interfaces directly with comparator inputs. |
| Test Equipment Digital Pattern Generators | Medical Infusion Pump Control Logic |
Use Scenario: Glitch-free signal inversion and gating in high-speed digital stimulus paths (e.g., clock enable trees). IC Role / Device Role / Timing Role: Critical path NOR gate in programmable pulse-width modulator feedback logic. Use Value: Matched tPLH/tPHL (<100ps skew) prevents duty cycle distortion; 50Ω line driving eliminates external termination resistors. | Use Scenario: Safety interlock validation logic verifying simultaneous actuation of dual redundant motor enable signals. IC Role / Device Role / Timing Role: Redundant fault-detection gate comparing two independent watchdog outputs. Use Value: 2kV HBM ESD rating withstands repeated operator contact during field service; low ICC minimizes standby power in battery-operated mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2-input NOR gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC02DR | SOP-14 package; identical AC/DC specs; same VCC range and drive strength | Larger footprint; less suitable for space-constrained PCBs with fine-pitch routing | Select when TSSOP assembly infrastructure is unavailable or thermal dissipation via larger pad area is preferred |
| 74HC02PW,118 | Lower drive (±4mA); slower tPD (15ns typ. at 4.5V); narrower VCC range (2–6V same, but lower noise margin) | Not suitable for 50Ω line driving or high-speed industrial backplanes | Choose only for cost-sensitive, low-speed consumer applications where ESD and latch-up immunity are non-critical |
Compared with SN74AC02DR and 74HC02PW,118, the 74AC02TTR uniquely delivers 50Ω transmission-line drive, 2kV ESD protection, and –55°C to +125°C operation in a compact TSSOP-14 package-making it optimal for ruggedized, high-reliability digital control nodes.
Availability
74AC02TTR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and medical infusion pump control logic requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74AC02TTR 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, designing and manufacturing analog, digital, and mixed-signal ICs for industrial, automotive, and power management applications.
The 74AC logic family targets high-speed, low-power, and high-noise-immunity digital interface and control functions in harsh-environment systems where reliability and timing precision are critical.
FAQ
Is the 74AC02TTR compatible with 3.3V-only systems?
Yes. The 74AC02TTR operates down to 2V and is fully specified at 3.3V ±0.3V, delivering 2.56V VOH (min) at –12mA and 0.44V VOL (max) at +12mA - meeting 3.3V LVTTL and LVCMOS interface requirements without level translation.
Does the 74AC02TTR require external pull-up or pull-down resistors on unused inputs?
No. Unused inputs must be tied to VCC or GND to prevent floating states and increased ICC. The device does not include internal pull resistors; leaving inputs unconnected risks oscillation, excess power draw, and ESD vulnerability due to undefined threshold crossing.
Can the 74AC02TTR drive a 50Ω coaxial cable directly?
Yes. Its ±24mA output drive and symmetrical impedance support incident-wave switching on 50Ω transmission lines. For reliable signal integrity beyond 10cm, use controlled-impedance PCB routing and terminate at the far end with 50Ω to avoid reflections and overshoot.
What is the maximum recommended input rise/fall time for reliable operation?
The datasheet specifies dt/dv ≤ 8 ns/V for VCC = 3.0V, 4.5V, or 5.5V. At 5V, this translates to ≤40ns max input transition time. Faster edges (≤3ns, as tested) ensure full AC performance; slower edges may cause increased propagation delay variation or metastability near threshold.
74AC02TTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74AC
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- NOR Gate
- Number of Circuits:
- 4
- Number of Inputs:
- 2
- Features:
- -
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Max):
- 2 µA
- Current - Output High, Low:
- 24mA, 24mA
- Input Logic Level - Low:
- 0.9V ~ 1.65V
- Input Logic Level - High:
- 2.1V ~ 3.85V
- Max Propagation Delay @ V, Max CL:
- 8ns @ 5V, 50pF
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
74AC02TTR FAQ
1.How can I place an order for 74AC02TTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC02TTR 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 74AC02TTR reliable?
The price and inventory of 74AC02TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC02TTR is usually 5 days.
3.What payment methods are accepted for 74AC02TTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC02TTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC02TTR?
74AC02TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC02TTR 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 74AC02TTR?
For technical support, including 74AC02TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC02TTR requirements.
6.How does Aetrix verify that 74AC02TTR is sourced from the original manufacturer or authorized distributors?
All 74AC02TTR 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 74AC02TTR meets industry standards.
7.What is the process for return or replacement of 74AC02TTR?
All 74AC02TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74AC02TTR, 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 74AC02TTR part is unused and in its original packaging.
Return procedure for 74AC02TTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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