MC74ACT32DR2G - 5V Quad 2-Input OR Gate, SOIC-14 | onsemi
Référence : MC74ACT32DR2G ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $0.41 | $0,41 |
| 10 | $0.32 | $3,20 |
| 100 | $0.24 | $24,00 |
| 500 | $0.19 | $95,00 |
| 1 000 | $0.16 | $160,00 |
| 2 500 | $0.13 | $325,00 |
MC74ACT32DR2G Présentation
An OR gate is a fundamental combinational logic primitive whose output is the logical disjunction of its two inputs: the output goes HIGH whenever at least one input is HIGH. The MC74ACT32DR2G belongs to the ACT subfamily, which provides TTL-compatible input voltage thresholds while retaining CMOS output drive capability. In the broader taxonomy, this part sits under: logic gate -> combinational logic -> standard logic -> digital IC -> semiconductor. The ACT family was specifically developed to ease migration from legacy 74LS/74F TTL designs to CMOS, providing the lower quiescent current of CMOS with input levels that directly interface to 5V TTL outputs.
Key specifications include four channels per package, two inputs per channel, one output per channel, 24 mA source/sink output drive capability, and a propagation delay of 9 ns at 5V VCC. The device features TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), rail-to-rail output swing to VCC and ground, and ESD protection on all pins. Power dissipation is reduced by approximately 50% compared to the equivalent bipolar 74LS32, while drive strength is retained.
Architecturally, the ACT32 uses CMOS transistors for both the input stage (TTL-compatible threshold via adjusted NMOS/PMOS ratios) and the output stage (symmetric push-pull drivers capable of 24 mA sink/source). This makes the part suitable for driving moderate capacitive loads, bus interfaces within a backplane, and LED indicators. The four gates share VCC and GND pins (pins 14 and 7 respectively), with each gate using two dedicated input pins and one output pin.
Typical applications include address decoding in 5V memory-mapped systems, glue logic between microcontrollers and peripherals, bus arbitration logic, control signal combining in industrial PLC interfaces, and general-purpose logic replacement in legacy TTL designs. The wide operating temperature range of -40C to +85C supports both commercial and industrial environments, while the SOIC-14 package is suitable for hand-soldered prototypes and high-volume SMT assembly lines.
When designing with the MC74ACT32DR2G, observe standard high-speed CMOS design practice: place a 0.1 uF decoupling capacitor as close as possible to the VCC pin (pin 14), keep input traces short to minimize noise-induced threshold violations, and avoid driving inputs above VCC. Unused inputs must be tied to VCC or GND - never left floating - to prevent unwanted shoot-through current in the input stage that can increase ICC. The ACT32 is a 5V-only part and will not operate correctly at 3.3V; for 3.3V applications use the 74LVC32 family instead.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet, with explicit cross-brand references to TI, Toshiba, and Fairchild equivalents that share the same SOIC-14 footprint.
Alternatives de remplacement direct pour MC74ACT32DR2G — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MC74ACT32DG
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC74ACT32DR2
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SN74ACT32DR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
CD74ACT32M
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
74ACT32SCX
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SN74ACT32D
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC74ACT32DR2G Valeurs maximales et caractéristiques électriques
| Logic Type | OR Gate |
| Number of Channels | 4 |
| Inputs per Channel | 2 |
| Outputs per Channel | 1 |
| Logic Family | ACT (74ACT32) |
| Supply Voltage (VCC) | 4.5 V to 5.5 V |
| Input Voltage Threshold (VIH min) | 2.0 V (TTL-compatible) |
| Input Voltage Threshold (VIL max) | 0.8 V (TTL-compatible) |
| Propagation Delay (tpd max) | 9 ns at 5 V, 50 pF load |
| Output Drive Current | ±24 mA source/sink |
| Quiescent Current (ICC) | Reduced by 50% vs 74LS32 |
| Température de fonctionnement | -40 C to +85 C |
| Boîtier | SOIC-14 (SO-14, 14-pin) |
| Type de montage | Surface Mount |
| Packaging | Tape & Reel (suffix R2) |
| Statut RoHS | Compliant |
| Input Compatibility | TTL-compatible inputs |
| ESD Protection | Yes (per datasheet) |
Configuration des broches de MC74ACT32DR2G
| Broche 1 | 1A — Gate 1 input A |
| Broche 2 | 1B — Gate 1 input B |
| Broche 3 | 1Y — Gate 1 output |
| Broche 4 | 2A — Gate 2 input A |
| Broche 5 | 2B — Gate 2 input B |
| Broche 6 | 2Y — Gate 2 output |
| Broche 7 | GND — Ground (0 V) |
| Broche 8 | 3Y — Gate 3 output |
| Broche 9 | 3A — Gate 3 input A |
| Broche 10 | 3B — Gate 3 input B |
| Broche 11 | 4Y — Gate 4 output |
| Broche 12 | 4A — Gate 4 input A |
| Broche 13 | 4B — Gate 4 input B |
| Broche 14 | VCC — Positive supply voltage (4.5 V to 5.5 V) |
Applications typiques
MC74ACT32DR2G convient pour 6 applications: 5V Address Decoding in Memory Systems, Industrial PLC Control Logic, Glue Logic Between MCU and 5V Peripherals, Bus Arbitration and Request Combining, Legacy 74LS32 TTL Replacement, LED Indicator and Status Combining.
5V Address Decoding in Memory Systems
The MC74ACT32DR2G is well suited for address decoding in 5V memory-mapped systems where multiple address lines must be combined to generate a chip-select signal. Its 9 ns propagation delay at 5V supports decode settling within one memory access cycle for memories with access times of 50 ns or longer. The ACT family's TTL-compatible inputs (VIH=2.0V, VIL=0.8V) directly interface to 5V microcontroller or FPGA address outputs. Place 0.1 uF decoupling on pin 14 (VCC) and route address lines as short matched traces to minimize skew between gate inputs. Compared to bipolar 74LS32, the MC74ACT32DR2G reduces quiescent current by approximately 50%.
Recommandé
Industrial PLC Control Logic
In industrial PLCs and control panels, the MC74ACT32DR2G combines multiple sensor or switch inputs into a single control signal such as a safety-stop, fault indicator, or motor-enable. The -40C to +85C operating temperature range handles factory-floor conditions including unconditioned enclosures. TTL-compatible thresholds provide 1.2V of noise margin, sufficient to reject 24V industrial transients when signals are properly conditioned. Each of the four gates can independently handle a different logic function in the same PLC, making the package density highly efficient. Recommended to add TVS protection on field-side inputs upstream of the gate.
Recommandé
Glue Logic Between MCU and 5V Peripherals
When a 3.3V microcontroller must control 5V peripherals, the MC74ACT32DR2G acts as a level-translation and logic-combining stage in a 5V domain. The ACT family's TTL-compatible inputs accept 3.3V CMOS outputs from the MCU as valid logic HIGH (since 3.3V > 2.0V VIH), eliminating the need for an external level shifter in many designs. The four independent gates allow combining interrupt, chip-select, and control signals into a single bus request or wake-up signal. Output drive of 24 mA is sufficient for LED indicators and short PCB traces. Place 0.1 uF and 1 uF decoupling in parallel near VCC pin.
Recommandé
Bus Arbitration and Request Combining
The MC74ACT32DR2G's four OR gates are ideal for combining multiple bus request (BR#) or DMA request lines into a single active-high request to a host processor or arbiter. With 9 ns propagation delay and 24 mA drive, the gate can drive moderate-length backplane traces while meeting timing requirements for common 5V bus architectures such as VME or simple parallel backplanes. TTL-compatible inputs interface directly to 5V peripheral request outputs. The 50% ICC reduction versus 74LS32 means lower power dissipation across densely populated arbitration logic.
Recommandé
Legacy 74LS32 TTL Replacement
The MC74ACT32DR2G is a drop-in functional and pin-compatible replacement for the older bipolar 74LS32, 74S32, and 74F32 in legacy 5V designs. By upgrading to ACT CMOS, designers reduce quiescent current by approximately 50% per package and gain improved noise margin, while retaining pin compatibility with the standard SOIC-14 footprint. The TTL-compatible inputs ensure the replacement accepts existing 5V TTL output drivers without external resistors. This is a common modernization path for legacy industrial controls, test equipment, and communication infrastructure that originally shipped with bipolar TTL logic.
Recommandé
LED Indicator and Status Combining
The MC74ACT32DR2G combines multiple status signals into a single LED or alarm-driver output, useful for panel-mounted indicators and fault annunciators. With 24 mA output drive, the device can directly sink the cathode of a 5V LED indicator (with appropriate series resistor) without an additional driver transistor. The four gates allow one package to consolidate 'any-of-N fault' indication across multiple subsystems. TTL-compatible inputs interface directly to 5V sensor, comparator, or microcontroller status outputs. For higher-current loads (above 24 mA), buffer with an external transistor or driver.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MC74ACT32DR2G — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MC74ACT32DG | MC74ACT32DR2 | SN74ACT32DR | CD74ACT32M | 74ACT32SCX |
|---|---|---|---|---|---|---|
| Brand | onsemi | onsemi | onsemi | Texas Instruments | Texas Instruments | onsemi (Fairchild-sourced) |
| Package | SOIC-14 | SOIC-14 - same | SOIC-14 - same | SOIC-14 - same | SOIC-14 - same | SOIC-14 - same |
| Logic Function | Quad 2-input OR | Quad 2-input OR | Quad 2-input OR | Quad 2-input OR | Quad 2-input OR | Quad 2-input OR |
| Logic Family | 74ACT (TTL-compatible inputs) | 74ACT | 74ACT | 74ACT | 74ACT (military) | 74ACT |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Propagation Delay | 9 ns max @ 5 V | 9 ns max @ 5 V | 9 ns max @ 5 V | 9 ns max @ 5 V | 9 ns max @ 5 V | 9 ns max @ 5 V |
| Output Drive | ±24 mA | ±24 mA | ±24 mA | ±24 mA | ±24 mA | ±24 mA |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -55 C to +125 C (military) | -40 C to +85 C |
Principaux différenciateurs
- Reduced quiescent current versus bipolar 74LS32 (vs 74LS32 (bipolar))
- Wide distributor availability at sub-$0.20 pricing (vs SN74ACT32DR (TI))
- Industrial temperature range standard (vs CD74ACT32M (TI military grade))
Notes de conception
Place a 0.1 uF ceramic decoupling capacitor as close as possible to the VCC pin (pin 14) and a 1 uF to 10 uF bulk capacitor nearby for transient suppression. The ACT32 family draws reduced quiescent current compared to bipolar 74LS32, but switching current spikes can still reach tens of mA during output transitions. Multiple parallel decoupling caps reduce supply droop during simultaneous output switching across all four gates.
Unused inputs must NEVER be left floating. Tie them to either VCC (for logic HIGH) or GND (for logic LOW) - a floating input on an ACT gate can drift to mid-supply and cause excessive shoot-through current in the input stage, increasing ICC by tens of microamps per floating input and potentially causing oscillation. Forcing unused inputs to a defined logic level also ensures predictable behavior during power-up sequencing.
Inputs should not exceed VCC. Driving an ACT input above VCC even briefly can forward-bias the input ESD protection diodes and inject current into the VCC rail. For 5V-tolerant operation on a 3.3V rail, use the 74LVC32 family instead. Keep input traces short to minimize capacitive coupling and ringing; series termination (33-100 ohm) may be needed when driving inputs from long PCB traces or external connectors.
Informations de conformité
RoHS compliant per Arrow.com product technical specifications. EU RoHS Compliant, ECCN EAR99, HTS 8542.39.00.90. AEC-Q100 not applicable - this is a standard logic IC, not an automotive-qualified part.
