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STMicroelectronics 74AC32TTR
- Part No.:
- 74AC32TTR
- Manufacturer:
- STMicroelectronics
- Category:
- Gates and Inverters
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74AC32TTR.pdf
- Description:
- IC GATE OR 4CH 2-INP 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,332
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Product details
Overview
74AC32TTR from STMicroelectronics is a quad 2-input OR gate IC in TSSOP-14 package, operating from 2V to 6V supply, with 4ns typical propagation delay at 5V, ±24mA symmetrical output drive, and 2µA max quiescent current at 25°C - used in high-speed logic interfacing and level translation in industrial control backplanes.
For engineers reviewing the 74AC32TTR datasheet, 74AC32TTR pinout, 74AC32TTR application, or 74AC32TTR 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
This device implements four independent OR gates using sub-micron C2MOS technology with buffered outputs, enabling stable switching and high noise immunity (VNIH/VNIL ≥ 28% VCC). Input thresholds scale with supply voltage, supporting mixed-voltage system interfacing across 2V–6V operation.
Propagation delays are balanced (tPLH ≅ tPHL), and output impedance is symmetrical (|IOH| = IOL ≥ 24mA), ensuring consistent rise/fall times and clean signal integrity on 50Ω transmission lines - critical for clock distribution and data bus gating in embedded controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - supports wide-supply systems including 3.3V and 5V rails without level shifters |
| tPD (Typ.) | 4ns at VCC = 5V - enables >100MHz toggle rates in combinatorial logic paths |
| IOL / IOH | ≥24mA - drives 50Ω transmission lines directly with minimal overshoot/ringing |
| ICC (Max) | 2µA at TA = 25°C - ultra-low static power for battery-backed or always-on logic stages |
| VNIH / VNIL | ≥28% VCC - provides robust noise margin against crosstalk and ground bounce |
| ESD Rating | 2kV HBM - protects inputs during board handling and system integration |
| Operating Temp | −55°C to +125°C - qualified for extended-temperature industrial and automotive under-hood use |
Pinout & Package
TSSOP-14 package: 4.9–5.1 mm width, 6.25–6.5 mm length, 0.65 mm pitch, 0.5–0.7 mm lead protrusion, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9, 12 | Input A1–A4 | First input of each OR gate; accepts 0–VCC logic levels with hysteresis-free CMOS thresholds |
| 2, 5, 10, 13 | Input B1–B4 | Second input per gate; electrically identical to A pins, fully interchangeable |
| 3, 6, 8, 11 | Output Y1–Y4 | Active-high OR outputs; rail-to-rail swing, capable of sourcing/sinking ≥24mA |
| 7 | GND | Dedicated ground reference; must be low-impedance connection to minimize ground bounce |
| 14 | VCC | Positive supply; decoupling capacitor (100nF) required within 5mm for stable high-speed operation |
Key Features
| Feature | Design Value |
|---|---|
| Pin- and function-compatible with 74LS32/74HC32 | Drop-in replacement for legacy designs without layout or firmware changes |
| 50Ω transmission line driving | Eliminates need for external series termination resistors in high-speed interconnects |
| Balanced tPLH/tPHL | Ensures 50% duty cycle preservation in clock-gating and pulse-width-sensitive circuits |
| Improved latch-up immunity | Withstands transient overvoltage events without destructive parasitic SCR activation |
| 2kV HBM ESD protection | Reduces risk of field failure during assembly, test, and end-user handling |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: OR-ing logic for redundant sensor inputs (e.g., door open/closed + window position). IC Role / Device Role / Timing Role: Combinatorial logic gate performing real-time signal aggregation with <4ns latency. Use Value: Enables deterministic response within 100ns system-level timing budget while maintaining 125°C operation. | Use Scenario: Wake-up signal arbitration across multiple CAN node controllers. IC Role / Device Role / Timing Role: Active-high OR gate merging wake requests before MCU power-on sequencing. Use Value: Guarantees sub-10ns signal resolution across temperature, eliminating race conditions in cold-start scenarios. |
| Test Equipment Signal Routing | Medical Diagnostic Data Acquisition |
Use Scenario: Gating of trigger pulses between FPGA-based pattern generators and DUT interfaces. IC Role / Device Role / Timing Role: High-fidelity logic buffer with matched rise/fall times for precise edge alignment. Use Value: Maintains <100ps skew between parallel channels when driving 50Ω coaxial traces. | Use Scenario: OR-combining of emergency stop signals from multiple patient interface sensors. IC Role / Device Role / Timing Role: Safety-critical combinational logic with guaranteed fail-safe low-power state (2µA ICC). Use Value: Meets IEC 62304 Class C software safety requirements via hardware-level redundancy support. |
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 |
|---|---|---|---|
| SN74AC32PW | TSSOP-14, identical AC/DC specs, TI's version with same 2–6V range and 4ns tPD | No functional difference; pinout and thermal profile match exactly | Select when dual-sourcing or TI-aligned BOMs required |
| 74VHC32FT | Lower drive (±8mA), higher speed (2.5ns tPD), 2–5.5V range, smaller 5-pin TSSOP footprint | Insufficient drive for 50Ω line termination; requires external buffers in high-Z loads | Prefer only in space-constrained, low-current applications where speed outweighs drive strength |
Compared with SN74AC32PW, 74AC32TTR offers identical performance and sourcing flexibility; versus 74VHC32FT, it delivers 3× higher output current essential for direct transmission-line driving without added components.
Availability
74AC32TTR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and medical diagnostic data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74AC32TTR 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 consumer markets.
The 74AC logic family targets high-speed, low-power TTL-compatible digital interfacing - optimized for noise immunity, transmission-line driving, and extended-temperature reliability in mission-critical embedded systems.
FAQ
Is 74AC32TTR compatible with 5V TTL logic inputs?
Yes - its VIH minimum is 2.1V at VCC = 3.0V and 3.15V at VCC = 4.5V, exceeding standard TTL's 2.0V threshold. Inputs tolerate 0–VCC voltage range and exhibit 28% VCC noise margin, ensuring reliable recognition of TTL-high signals across temperature and supply variation.
What is the maximum capacitive load this device can drive reliably?
Per AC characterization, 74AC32TTR is specified with CL = 50 pF and RL = 500 Ω. It maintains 4ns typical tPD up to 50 pF; for heavier loads (>100 pF), propagation delay increases nonlinearly and output ringing may occur without series damping - use external 22–33Ω series resistors for loads >75 pF.
Does this part support mixed-voltage operation between inputs and outputs?
No - all inputs and outputs operate referenced to the same VCC rail (2–6V). The device does not support I/O voltage translation; for level-shifting between disparate rails (e.g., 3.3V logic controlling 5V peripherals), a dedicated translator like TXB0104 is required.
Can 74AC32TTR be used in place of 74HC32 in existing designs?
Yes - it is pin- and function-compatible with 74HC32 but offers superior performance: 4ns vs. 7ns typical tPD at 5V, ±24mA vs. ±4mA drive, and enhanced latch-up/ESD immunity. No layout or firmware changes are needed, though decoupling and grounding should be verified for >50MHz operation.
74AC32TTR 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:
- OR 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:
- 7.5ns @ 5V, 50pF
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
74AC32TTR FAQ
1.How can I place an order for 74AC32TTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC32TTR 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 74AC32TTR reliable?
The price and inventory of 74AC32TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC32TTR is usually 5 days.
3.What payment methods are accepted for 74AC32TTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC32TTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC32TTR?
74AC32TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC32TTR 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 74AC32TTR?
For technical support, including 74AC32TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC32TTR requirements.
6.How does Aetrix verify that 74AC32TTR is sourced from the original manufacturer or authorized distributors?
All 74AC32TTR 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 74AC32TTR meets industry standards.
7.What is the process for return or replacement of 74AC32TTR?
All 74AC32TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74AC32TTR, 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 74AC32TTR part is unused and in its original packaging.
Return procedure for 74AC32TTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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