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STMicroelectronics 74ACT32TTR
- Part No.:
- 74ACT32TTR
- Manufacturer:
- STMicroelectronics
- Category:
- Gates and Inverters
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74ACT32TTR.pdf
- Description:
- IC GATE OR 4CH 2-INP 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,147
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Product details
Overview
74ACT32TTR from STMicroelectronics is a quad 2-input OR gate in TSSOP-14 package, operating at 4.5–5.5 V with 4.5 ns typical propagation delay, ±24 mA symmetrical output drive, and TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V). It interfaces high-speed CMOS systems with TTL/NMOS logic in industrial control and data acquisition subsystems.
For engineers reviewing the 74ACT32TTR datasheet, 74ACT32TTR pinout, 74ACT32TTR application, or 74ACT32TTR equivalent, key selection criteria include transmission-line driving capability (50 Ω), latch-up immunity, ESD tolerance (2 kV), and guaranteed balanced tPLH/tPHL delays across temperature ranges.
Technical Context
This device implements four independent OR logic functions using sub-micron C2MOS technology with buffered outputs, enabling high noise immunity and stable switching. Its internal two-stage architecture supports direct interfacing between HC/HCT/ACT families and legacy TTL/NMOS systems without level-shifting circuitry.
All inputs and outputs feature integrated protection diodes for ±20 mA DC current handling and transient voltage suppression. The design meets absolute maximum ratings up to VCC = +7 V and operates reliably from –55 °C to +125 °C with 2 kV HBM ESD immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V logic rails and tolerates supply variation in noisy industrial environments. |
| tPD (Typ.) | 4.5 ns at VCC = 5 V - Enables reliable operation in high-speed digital systems with clock periods down to ~220 MHz. |
| IOL / IOH (Min.) | 24 mA - Drives 50 Ω transmission lines directly without external buffers, reducing board space and signal integrity risk. |
| VIH / VIL Thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - Guarantees interoperability with TTL-output devices across full temperature range. |
| ICC (Max.) | 2 µA at TA = 25 °C - Delivers ultra-low static power consumption suitable for battery-backed or energy-sensitive applications. |
| ESD Immunity | 2 kV HBM - Protects against common handling and assembly electrostatic events without external TVS components. |
| CIN | 3 pF - Minimizes capacitive loading on driving stages, preserving edge rate and timing margin in fan-out configurations. |
Pinout & Package
TSSOP-14 package: 4.9–5.1 mm width, 6.25–6.5 mm length, 1.1 mm height, 0.65 mm pitch, lead-free compliant per RoHS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9, 12 | Input A1–A4 | First input of each OR gate; accepts TTL/CMOS logic levels with defined VIH/VIL thresholds. |
| 2, 5, 10, 13 | Input B1–B4 | Second input of each OR gate; electrically identical to A pins, supporting independent dual-input logic evaluation. |
| 3, 6, 8, 11 | Output Y1–Y4 | OR result per gate; delivers symmetrical sourcing/sinking capability (±24 mA) and low VOL/VOH. |
| 7 | GND | Reference ground plane for all logic and power domains; requires low-inductance PCB connection for noise control. |
| 14 | VCC | Positive supply rail; decoupling capacitor (0.1 µF ceramic) required within 5 mm for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| 50 Ω transmission line drive | Guaranteed ±24 mA output current enables direct termination into 50 Ω traces, eliminating need for external series resistors in high-speed routing. |
| Balanced propagation delays | tPLH ≅ tPHL minimizes duty cycle distortion in clocked or synchronous logic paths, critical for setup/hold timing compliance. |
| Improved latch-up immunity | Sub-micron C2MOS process and layout hardening prevent destructive SCR triggering under overvoltage or ESD stress. |
| 2 kV HBM ESD protection | Integrated input/output clamping diodes eliminate requirement for discrete ESD protection in most industrial assembly environments. |
Applications
| Industrial PLC I/O Expansion | Legacy System Bus Interface |
|---|---|
Use Scenario: Expanding discrete input channels in programmable logic controllers by OR-ing multiple sensor fault signals into a single alarm line. IC Role / Device Role / Timing Role: Logic-level aggregation node performing real-time Boolean OR on asynchronous 24 VDC-sensed inputs via optocoupler outputs. Use Value: Eliminates need for microcontroller polling or additional glue logic; leverages 4.5 ns delay and 24 mA drive to meet <100 ns response requirements. | Use Scenario: Bridging 5 V TTL-based peripheral cards (e.g., ISA bus add-ons) to modern CMOS-based host controllers. IC Role / Device Role / Timing Role: Voltage-level translator and signal combiner ensuring compatible VIH/VIL thresholds and timing alignment across mixed-technology buses. Use Value: Avoids external level shifters while maintaining <10 ns skew between parallel data lines due to matched tPLH/tPHL. |
| Test Equipment Signal Conditioning | Automated Test Fixture Logic |
Use Scenario: Combining pass/fail outputs from multiple DUT test channels into a consolidated go/no-go indicator for production testers. IC Role / Device Role / Timing Role: High-reliability combinational logic element operating continuously at 5 V with minimal self-heating (<2 µA ICC). Use Value: Supports 24/7 operation in thermal-constrained enclosures; 125 °C max operating temperature ensures stability during extended burn-in cycles. | Use Scenario: Implementing interlock logic in automated test fixtures where mechanical actuator status and safety sensor states must be OR-ed before enabling motion. IC Role / Device Role / Timing Role: Safety-critical decision node requiring predictable propagation behavior and robust ESD resilience in factory-floor environments. Use Value: 2 kV HBM rating withstands repeated operator contact; symmetrical drive ensures consistent relay coil activation timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2-input OR gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT32DR | SOP-14 package; identical AC/DC specs but lacks TSSOP's board-area efficiency and thermal profile. | Preferred for through-hole prototyping or legacy SOP-based designs; not suitable for fine-pitch SMT lines. | Select when manual rework or socket-based validation is required; avoid for high-density automated assembly. |
| MC74ACT32DT | Same TSSOP-14 footprint; minor differences in ICC max (40 µA vs. 20 µA) and VOH min at -24 mA (3.7 V vs. 3.86 V). | Valid for cost-sensitive consumer-grade applications where tighter VOH margin is acceptable. | Choose only after verifying system-level noise margin; not recommended for industrial 5 V rail systems with >100 mV ground bounce. |
Compared with SN74ACT32DR and MC74ACT32DT, the 74ACT32TTR offers superior thermal dissipation in compact layouts and the tightest VOH specification at full load-critical for noise-immune 5 V logic interfacing in harsh environments.
Availability
74ACT32TTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy system bus interface, and automated test fixture logic requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 74ACT32TTR 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 automotive, industrial, and consumer markets.
The 74ACT32TTR belongs to ST's advanced CMOS logic family, engineered specifically for high-speed, low-power interoperability between TTL, NMOS, and modern CMOS systems in mission-critical industrial environments.
FAQ
What is the maximum operating temperature for the 74ACT32TTR?
The 74ACT32TTR is rated for continuous operation from –55 °C to +125 °C. This extended temperature range is validated per STMicroelectronics' qualified industrial grade testing and supports deployment in motor control cabinets, outdoor instrumentation, and under-hood automotive modules where ambient heat exceeds 85 °C.
Does the 74ACT32TTR 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, but no external resistors are needed-the device has no internal weak pull-ups or pull-downs. Leaving inputs unconnected risks undefined logic states, excessive power draw, and potential oscillation due to noise coupling.
Can the 74ACT32TTR drive a 50 Ω coaxial cable directly?
Yes. With guaranteed ±24 mA output drive and symmetrical impedance, the 74ACT32TTR can terminate and drive 50 Ω transmission lines without external series resistors. Verified under AC conditions (CL = 50 pF, RL = 500 Ω, tr/tf = 3 ns), it maintains signal integrity up to 100 MHz with <10% overshoot in controlled-impedance PCB layouts.
Is the 74ACT32TTR pin-compatible with older 74LS32 devices?
Yes-pin and function compatible with standard 74-series 32 devices including 74LS32, 74HC32, and 74HCT32. All 14 pins map identically: inputs at 1/2/4/5/9/10/12/13, outputs at 3/6/8/11, VCC at 14, GND at 7. However, ACT logic requires 5 V supply only and does not tolerate 3.3 V operation.
74ACT32TTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74ACT
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- OR Gate
- Number of Circuits:
- 4
- Number of Inputs:
- 2
- Features:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Max):
- 2 µA
- Current - Output High, Low:
- 24mA, 24mA
- Input Logic Level - Low:
- 0.8V
- Input Logic Level - High:
- 2V
- Max Propagation Delay @ V, Max CL:
- 9ns @ 5V, 50pF
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
74ACT32TTR FAQ
1.How can I place an order for 74ACT32TTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT32TTR 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 74ACT32TTR reliable?
The price and inventory of 74ACT32TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT32TTR is usually 5 days.
3.What payment methods are accepted for 74ACT32TTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT32TTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT32TTR?
74ACT32TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT32TTR 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 74ACT32TTR?
For technical support, including 74ACT32TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT32TTR requirements.
6.How does Aetrix verify that 74ACT32TTR is sourced from the original manufacturer or authorized distributors?
All 74ACT32TTR 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 74ACT32TTR meets industry standards.
7.What is the process for return or replacement of 74ACT32TTR?
All 74ACT32TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT32TTR, 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 74ACT32TTR part is unused and in its original packaging.
Return procedure for 74ACT32TTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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