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STMicroelectronics 74AC32MTR
- Part No.:
- 74AC32MTR
- Manufacturer:
- STMicroelectronics
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74AC32MTR.pdf
- Description:
- IC GATE OR 4CH 2-INP 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,632
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Product details
Overview
74AC32MTR from STMicroelectronics is a quad 2-input OR gate in high-speed CMOS technology, operating across 2V–6V supply, delivering 4ns typical propagation delay at 5V, ±24mA symmetrical output drive, and 2µA max quiescent current at 25°C. It serves as a logic-level combinatorial gate in digital control subsystems requiring noise-immune signal aggregation, such as industrial PLC I/O modules.
For engineers reviewing the 74AC32MTR datasheet, 74AC32MTR pinout, 74AC32MTR application, or 74AC32MTR equivalent, key selection criteria include transmission-line driving capability (50Ω), latch-up immunity, ESD tolerance (2kV), input voltage thresholds (VIH/VIL = 2.1V/0.9V @ 3V), and temperature range (-55°C to +125°C).
Technical Context
The 74AC32 implements four independent OR gates with buffered outputs, enabling stable switching and high noise immunity via C2MOS sub-micron silicon gate process. Each gate features symmetrical output impedance (|IOH| = |IOL| ≥ 24mA) and balanced tPLH/tPHL delays for minimal skew in parallel logic paths.
It supports incident-wave switching on 50Ω transmission lines and meets stringent DC input thresholds (VIH ≥ 70% VCC, VIL ≤ 30% VCC) across full temperature range. Input protection includes 2kV HBM ESD diodes and transient voltage clamping on all pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - Enables interoperability with 3.3V and 5V logic families without level shifters. |
| tPD (Typ) | 4ns @ VCC = 5V - Supports >100MHz toggle rates in combinatorial logic chains. |
| IOL / IOH | ≥24mA - Drives 50Ω transmission lines directly; eliminates need for external line drivers. |
| VNIH / VNIL | ≥28% VCC - Ensures robust operation under noisy industrial power rail conditions. |
| ICC (Max) | 2µA @ TA = 25°C - Enables ultra-low static power in battery-backed or always-on control logic. |
| Operating Temp | -55°C to +125°C - Qualified for under-hood automotive, motor drive, and aerospace environments. |
| ESD Rating | 2kV HBM - Protects against handling-induced discharge without external TVS components. |
Pinout & Package
74AC32MTR is housed in a 14-lead SOIC (Small Outline Integrated Circuit) package with 1.27mm pitch, JEDEC MS-012 compliant, body dimensions 8.55 × 5.8 mm (max), and gull-wing leads suitable for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9, 12 | Input A (Gate 1–4) | First operand input per OR gate; accepts TTL- and CMOS-compatible logic levels. |
| 2, 5, 10, 13 | Input B (Gate 1–4) | Second operand input per OR gate; electrically identical to Input A pins. |
| 3, 6, 8, 11 | Output Y (Gate 1–4) | Active-high OR result; capable of sourcing/sinking ≥24mA into resistive or 50Ω loads. |
| 7 | GND | Logic ground reference; must be low-impedance connection to minimize ground bounce. |
| 14 | VCC | Positive supply; decoupling capacitor (100nF) required within 1cm for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Quad 2-input OR function | Four independent gates in single SOIC-14; reduces board space vs discrete gate arrays. |
| 50Ω transmission-line drive | Guaranteed incident-wave switching on controlled-impedance PCB traces - no termination resistor needed. |
| Symmetrical output drive | |IOH| = |IOL| ≥ 24mA - Eliminates duty-cycle distortion in clocked or data-path applications. |
| High noise immunity | VNIH/VNIL ≥ 28% VCC - Tolerates ≥1.4V noise margin on 5V rails; critical for factory-floor EMI resilience. |
| Latch-up immunity | Improved over standard CMOS - prevents destructive parasitic SCR conduction during overvoltage transients. |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
Use Scenario: Aggregating multiple sensor fault signals (e.g., door open, seatbelt unfastened, hood ajar) into a single warning bus line. IC Role / Device Role / Timing Role: Combinatorial OR gate performing real-time logical OR of asynchronous safety inputs. Use Value: Delivers sub-5ns response with 2kV ESD hardening - avoids false triggers in high-noise vehicle harness environments. |
Use Scenario: Enabling redundant wake-up logic for CAN transceiver power management based on multiple ignition or accessory switch inputs. IC Role / Device Role / Timing Role: Level-sensitive OR combiner feeding enable input of low-quiescent LDO or load switch. Use Value: 2µA ICC enables <1µA system standby current; -55°C to +125°C rating ensures cold-cranking reliability. |
| Test Equipment Signal Routing | Medical Diagnostic Interface Logic |
Use Scenario: Selecting active test channel by OR-ing enable bits from FPGA-controlled multiplexer control lines. IC Role / Device Role / Timing Role: High-speed logic gate synchronizing channel selection before analog acquisition window opens. Use Value: 4ns tPD ensures deterministic setup time for 100MHz sampling clocks; 50Ω drive matches PCB trace impedance. |
Use Scenario: Combining emergency stop, interlock, and calibration-ready signals to generate a unified "safe-to-operate" flag. IC Role / Device Role / Timing Role: Safety-critical combinatorial logic element in Class II medical device control path. Use Value: Guaranteed operation at 6V allows direct interface with isolated 5.5V supply rails; 2kV ESD protects against operator contact discharge. |
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 |
|---|---|---|---|
| SN74AC32DR | TI part; identical AC/DC specs but wider VCC min (2V vs 1.5V), slightly higher CPD (36pF vs 33pF). | Same industrial temp range; TI's qualification documentation emphasizes automotive AEC-Q100 Grade 2 compliance. | Preferred where AEC-Q100 traceability is contractually required; otherwise functionally interchangeable. |
| 74VHC32M | ON Semiconductor part; lower ICC (1µA typ), slower tPD (7.5ns typ @ 5V), same 24mA drive. | Lower speed limits use in >50MHz timing paths; better suited for ultra-low-power battery monitoring logic. | Select when static power dominates design priority and propagation delay <6ns is not required. |
Compared with SN74AC32DR and 74VHC32M, the 74AC32MTR offers the best balance of speed (4ns), drive strength (24mA), and industrial temperature support without AEC-Q100 overhead - ideal for cost-sensitive, high-reliability embedded control.
Availability
74AC32MTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, test equipment signal routing, and medical diagnostic interface logic requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74AC32MTR 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 microcontrollers, power ICs, sensors, and logic devices for industrial, automotive, and consumer markets.
The 74AC series targets high-speed, low-power, industrial-grade logic applications - emphasizing noise immunity, transmission-line compatibility, and extended temperature operation over legacy 74LS or 74HC families.
FAQ
Is 74AC32MTR pin-compatible with standard 74LS32 or 74HC32?
Yes - it is pin- and function-compatible with 74-series 32 OR gates, including 74LS32 and 74HC32. However, its higher drive strength (24mA vs 8mA for LS, 12mA for HC) and wider VCC range (2–6V vs 4.75–5.25V for LS) require verification of load compatibility and decoupling design.
Can 74AC32MTR operate reliably at 3.3V supply?
Yes - it is fully specified at VCC = 3.0V, 4.5V, and 5.5V. At 3.3V, VIH = 2.1V (min), VIL = 1.5V (max), tPD = 5.5ns (max), and IOH/IOL ≥ 12mA, making it compatible with 3.3V LVTTL and mixed-voltage systems.
Does 74AC32MTR require external pull-up or pull-down resistors on unused inputs?
No - unused inputs may be tied directly to VCC or GND. The device has no internal pull-ups; however, floating inputs must be avoided to prevent increased ICC and potential oscillation due to noise coupling into high-impedance nodes.
What is the maximum recommended capacitive load for 74AC32MTR outputs?
The AC specifications assume CL = 50pF. Driving >100pF loads increases tPD and may cause ringing on unterminated lines. For >50pF, add series source termination (e.g., 33Ω) close to the output pin to dampen reflections.
74AC32MTR 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
- 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-SO
74AC32MTR FAQ
1.How can I place an order for 74AC32MTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC32MTR 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 74AC32MTR reliable?
The price and inventory of 74AC32MTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC32MTR is usually 5 days.
3.What payment methods are accepted for 74AC32MTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC32MTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC32MTR?
74AC32MTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC32MTR 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 74AC32MTR?
For technical support, including 74AC32MTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC32MTR requirements.
6.How does Aetrix verify that 74AC32MTR is sourced from the original manufacturer or authorized distributors?
All 74AC32MTR 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 74AC32MTR meets industry standards.
7.What is the process for return or replacement of 74AC32MTR?
All 74AC32MTR units undergo pre-shipment inspection (PSI). If there is an issue with 74AC32MTR, 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 74AC32MTR part is unused and in its original packaging.
Return procedure for 74AC32MTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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