SN74HC21QPWRG4Q1 - Dual 4-Input AND Gate AEC-Q100 | TI
MPN: SN74HC21QPWRG4Q1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.55 | $0.55 |
| 10 | $0.48 | $4.80 |
| 100 | $0.42 | $42.00 |
| 500 | $0.4 | $200.00 |
| 1,000 | $0.38 | $380.00 |
Drop-in alternatives for SN74HC21QPWRG4Q1 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
SN74HC21APWR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
CD74HC21PWR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
74HC21PW,118
β Drop-Inπ Reference alternative (not in catalog)
SN74HC21QDRG4Q1
β Drop-Inπ Reference alternative (not in catalog)
SN74HC21QPWRG4Q1 Maximum Ratings & Electrical Characteristics
| Logic Type | AND Gate |
| Number of Circuits | 2 |
| Number of Inputs per Gate | 4 |
| Supply Voltage Range | 2 V to 6 V |
| Quiescent Current (Max) | 2 uA |
| Output Drive Current (High/Low) | 5.2 mA / 5.2 mA |
| LSTTL Loads per Output | 10 |
| Input Logic Level - Low | 0.5 V to 1.8 V (VCC dependent) |
| Operating Temperature Range | -40C to +125C |
| Package | 14-TSSOP (PW), 4.40 mm width |
| Mounting Type | Surface Mount |
| Technology Family | 74HC (High-Speed CMOS) |
| Qualification | AEC-Q100 (Automotive) |
| Boolean Function | Y = A AND B AND C AND D (per gate) |
| Series | 74HC-Q1 Automotive |
SN74HC21QPWRG4Q1 Pin Configuration
| Pin 1 | 1A β Gate 1 input A |
| Pin 2 | 1B β Gate 1 input B |
| Pin 3 | NC β Not connected (per datasheet) |
| Pin 4 | 1C β Gate 1 input C |
| Pin 5 | 1D β Gate 1 input D |
| Pin 6 | 1Y β Gate 1 output Y = 1A AND 1B AND 1C AND 1D |
| Pin 7 | GND β Ground |
| Pin 8 | 2A β Gate 2 input A |
| Pin 9 | 2B β Gate 2 input B |
| Pin 10 | NC β Not connected (per datasheet) |
| Pin 11 | 2C β Gate 2 input C |
| Pin 12 | 2D β Gate 2 input D |
| Pin 13 | 2Y β Gate 2 output Y = 2A AND 2B AND 2C AND 2D |
| Pin 14 | VCC β Power supply, 2V to 6V |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
SN74HC21QPWRG4Q1 is suitable for 6 applications: Automotive Body Control Modules, ECU Power Sequencing and Enable Gating, Industrial Safety Interlocks, Sensor Signal Qualification, Clock and Reset Supervision Logic, Test and Measurement Instrument Gating.
Automotive Body Control Modules
The SN74HC21QPWRG4Q1 is purpose-built for automotive body-control modules (BCMs) where multiple condition signals - door switches, seat-belt latches, ignition states - must be ANDed together before enabling loads such as interior lighting or relay coils. Its AEC-Q100 qualification and -40C to +125C rating guarantee operation across the full automotive ambient envelope, while the 2 uA maximum quiescent current preserves battery budget in always-on modules. The 2V-6V supply range tolerates cranking transients on 5V logic rails. Placed between sensor buffers and microcontroller interrupt inputs, each 4-input gate consolidates four discrete-condition checks into one nanosecond-class hardware verdict, reducing MCU GPIO count and firmware latency in safety-relevant interlock paths.
Recommended
ECU Power Sequencing and Enable Gating
In electronic control units, power rails must be enabled only when several prerequisites are met - supply-good flags, overtemperature-clear signals, and ignition-on states. The SN74HC21QPWRG4Q1's two 4-input AND gates implement these multi-condition enables in pure hardware with 5.2 mA drive, sufficient to directly drive enable pins or optocoupler LEDs of downstream regulators. Its HC-family rail-to-rail CMOS output swings cleanly to the rail, guaranteeing unambiguous enable thresholds, and the 2V-6V range lets it live on either 3.3V or 5V monitoring rails. Compared to firmware-based gating, hardware ANDing eliminates software boot-time dependency, ensuring fail-safe power sequencing that holds even if the MCU is held in reset.
Recommended
Industrial Safety Interlocks
Industrial machinery requires that guard doors, emergency-stop chains, and start commands all agree before a machine actuates. The SN74HC21QPWRG4Q1 provides a hardware AND of up to four such interlock signals per gate, with defined CMOS thresholds (VIH scaling with VCC) that reject ground-bounce noise common on factory floors. With 5.2 mA output drive it can directly energize the input of a relay driver or PLC input card. While the part is automotive-qualified, that screening level comfortably exceeds typical industrial temperature demands, and its 2 uA quiescent current suits battery-backed safety monitoring units. The nanosecond-class propagation delay ensures interlock verdicts occur within one scan cycle, supporting deterministic stop-path timing.
Recommended
Sensor Signal Qualification
Redundant or multi-sensor systems often require that all sensors in a group report an active condition before the system reacts - a classic 4-input AND problem. The SN74HC21QPWRG4Q1 evaluates four sensor outputs per gate with high-impedance CMOS inputs that draw negligible loading current, preserving weak sensor drive capability. In automotive contexts such as seat-occupancy plus belt-latch qualification, or in industrial proximity-sensor voting, the TSSOP-14 package fits dense sensor-hub PCBs at 4.40 mm width. The rail-to-rail output presents a clean single-line qualified signal to the MCU, and the wide 2V-6V supply range allows operation from the same rail as 3.3V or 5V sensor front-ends without translation.
Recommended
Clock and Reset Supervision Logic
System reset and clock-enable logic frequently requires several supervision flags - power-good, watchdog-clear, manual-reset-release - to combine before releasing a processor from reset. The SN74HC21QPWRG4Q1 ANDs up to four supervision outputs with nanosecond-class delay, guaranteeing the MCU reset line asserts immediately when any condition drops. Its 5.2 mA drive can pull typical reset-network capacitance quickly, and the AEC-Q100 rating makes it suitable for automotive ECUs where reset integrity is safety-relevant. Operating from the same 3.3V or 5V rail as the supervisor ICs, it adds only 2 uA quiescent current to the always-on standby budget, an advantage over MCU-firmware implementations that cannot react during the reset state itself.
Recommended
Test and Measurement Instrument Gating
Bench instruments and automated test equipment use multi-input AND gates to qualify acquisition triggers - combining arm, range-valid, and threshold-crossed signals before a measurement event latches. The SN74HC21QPWRG4Q1's HC-family propagation delay in the nanosecond range preserves trigger timing accuracy, while rail-to-rail CMOS outputs give clean edges into counter or FPGA trigger inputs. The 2V-6V supply flexibility suits instruments built on 3.3V, 5V, or mixed rails, and the TSSOP-14 footprint integrates into dense trigger-conditioning boards. Although Q1 automotive screening is unnecessary here, it imposes no penalty and offers margin over commercial temperature specs in instrument enclosures that run warm.
Recommended
Recommended Products Summary
Engineering reference data for SN74HC21QPWRG4Q1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN74HC21APWR | CD74HC21PWR | 74HC21PW,118 | SN74HC21QDRG4Q1 |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | NXP Semiconductors | Texas Instruments |
| Package | TSSOP-14 (PW) | TSSOP-14 (PW) - same | TSSOP-14 (PW) - same | TSSOP-14 (PW) - same | SOIC-14 (D) - different footprint |
| Logic Function | Dual 4-input AND | Dual 4-input AND | Dual 4-input AND | Dual 4-input AND | Dual 4-input AND |
| Supply Voltage | 2 V to 6 V | 2 V to 6 V | 2 V to 6 V | 2 V to 6 V | 2 V to 6 V |
| Output Drive | 5.2 mA (10 LSTTL loads) | 5.2 mA class | [DATA_NEEDED] | [DATA_NEEDED] | 5.2 mA (10 LSTTL loads) |
| Quiescent Current (Max) | 2 uA | 2 uA class | [DATA_NEEDED] | [DATA_NEEDED] | 2 uA |
| AEC-Q100 Automotive | Yes (-40C to +125C) | No (standard grade) | No (standard grade) | Manufacturer automotive flow (verify) | Yes (-40C to +125C) |
| Unit Price (qty 1, as of 2026-09-04) | $0.55 | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- AEC-Q100 automotive qualification in a TSSOP-14 footprint (vs SN74HC21APWR)
- Two 4-input gates in one 14-pin package (vs 74HC21PW,118 (single-function equivalents aside))
- Wide 2V-6V supply tolerance for automotive transients (vs CD74HC21PWR)
Design Notes
Never leave CMOS inputs floating. All eight inputs of the SN74HC21QPWRG4Q1 (1A-1D, 2A-2D) must be driven to VCC or GND, or tied via pull resistors, in every operating state including MCU reset and connector-unplugged conditions. Floating HC inputs can hover near the switching threshold, causing both gates to oscillate, raising ICC far above the 2 uA spec, and injecting noise into nearby traces. For automotive harness-connected inputs, add pull-ups or pull-downs sized 10 kOhm-100 kOhm so the gate fails to a defined state if a wire breaks.
Place a 100 nF ceramic decoupling capacitor within 5 mm of the VCC pin (pin 14) with a low-inductance ground return to pin 7. Although a slow logic gate generates little switching noise itself, the decoupling cap also shunts rail transients that could momentarily violate input thresholds. Keep gate inputs away from high-dV/dt nets such as relay coil drives or gate-driver outputs in automotive BCM layouts; HC inputs have high impedance and can couple false levels capacitively from adjacent traces on a 2-layer board.
Estimated: at 5V VCC with 8 logic transitions per microsecond and 15 pF load per output, dynamic ICC remains well under 1 mA - the dominant consumption is load current, up to 5.2 mA per output. Ensure the supply rail feeding VCC can source 2x5.2 mA plus quiescent margin. If outputs drive long harness-connected wires (common in automotive), add 22-100 Ohm series resistors at the outputs to damp line reflections and limit fault current during short-to-battery events on the driven line.
Compliance Information
AEC-Q100 qualified per TI product page (74HC-Q1 automotive series, -40C to +125C). RoHS/lead-free status per standard TI automotive catalog offering; REACH and halogen-free status not stated in provided data.
