Texas Instruments SN74HCS30DR

Overview

SN74HCS30DR from Texas Instruments is a single 8-input NAND gate IC with Schmitt-trigger inputs, operating across 2 V to 6 V supply voltage, delivering ±7.8 mA output drive at 5 V, and supporting industrial temperature range (–40°C to +125°C). It performs Y = A·B·C·D·E·F·G·H logic in positive logic and is used in tamper-detect circuits and S-R latch implementations.

For engineers reviewing the SN74HCS30DR datasheet, SN74HCS30DR pinout, SN74HCS30DR application, or SN74HCS30DR equivalent, key selection criteria include Schmitt-trigger hysteresis (ΔVT ≥ 0.2 V), low ICC (≤2 µA max), input leakage (±1000 nA max), propagation delay (tpd ≤ 46 ns at 2 V), and SOIC-14 package compatibility with legacy 5-V and mixed-voltage logic systems.

Technical Context

This device implements a single Boolean NAND function with eight independent CMOS inputs, each incorporating Schmitt-trigger hysteresis to reject noise and tolerate slow-rising/falling edges. Its balanced push-pull output stage enables symmetrical sourcing and sinking capability up to ±7.8 mA at 5 V.

The IC operates without input transition-rate constraints due to its Schmitt architecture, and its logic threshold voltages (VT+ = 0.7–4.2 V, VT− = 0.3–3.0 V) scale with VCC, ensuring robust operation across the full 2–6 V supply range while maintaining defined noise margins via ΔVT ≥ 0.2 V.

Key Specifications

Pinout & Package

SN74HCS30DR is housed in a 14-pin SOIC (D) package measuring 8.70 mm × 3.90 mm, with standard 1.27 mm pitch and gull-wing leads. The package is RoHS-compliant, moisture-sensitivity level 1, and rated for reflow up to 260°C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-input NAND gate applications.

Compared with SN74HCS30PWR, SN74HCS30DR offers greater mechanical robustness and easier hand-soldering, while SN74LVX30M trades hysteresis and wide-VCC capability for lower static power in narrow-voltage applications - making SN74HCS30DR the optimal choice for industrial sensing and security systems demanding noise resilience and supply versatility.

Availability

SN74HCS30DR is available at Aetrix Electronics and suitable for alarm/tamper detect circuits, S-R latch implementations, industrial input conditioning, and legacy system interface applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SN74HCS30DR 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of heritage in high-reliability industrial and automotive components.

The SN74HCS30DR belongs to TI's HCS logic family, engineered for ultra-low power consumption and robust noise immunity in harsh environments - specifically targeting security systems, industrial controls, and battery-operated sensing nodes.

FAQ

What is the maximum supply voltage rating for SN74HCS30DR?

The absolute maximum supply voltage for SN74HCS30DR is 7 V, though recommended operation is limited to 2 V–6 V per datasheet specifications. Exceeding 7 V risks permanent damage due to junction breakdown. At 6 V, the device delivers full output drive (±7.8 mA) and meets all timing parameters; operation above 6 V is not characterized and voids reliability guarantees. Always observe the 7 V limit even during transient conditions.

Does SN74HCS30DR require external pull-up resistors on unused inputs?

Yes - all unused inputs on SN74HCS30DR must be terminated to either VCC or GND to prevent floating states that cause excessive current draw and logic instability. While Schmitt-trigger inputs tolerate slow edges, they do not include internal pull-ups or pull-downs. A 10-kΩ resistor is commonly used; direct connection is acceptable if the input is permanently unused. Leaving inputs unconnected violates TI's layout guidelines and may lead to unpredictable output behavior.

Can SN74HCS30DR drive an LED directly?

Yes - SN74HCS30DR can drive a standard 5-mm LED directly when configured as an active-low sink (connect LED anode to VCC, cathode to Y output). At 5 V supply, it sources up to 7.8 mA, sufficient for indicator brightness. Ensure current-limiting resistance is calculated using VOL (≤0.3 V) and forward voltage (e.g., 2 V for red LED): R = (5 V − 2 V − 0.3 V)/7.8 mA ≈ 350 Ω. Do not exceed 7.8 mA per output or 70 mA total through VCC/GND pins.

What is the hysteresis voltage (ΔVT) of SN74HCS30DR at 5 V supply?

At VCC = 4.5 V (representative of 5 V operation), SN74HCS30DR exhibits a hysteresis voltage ΔVT of 0.4 V (min) to 1.4 V (max), calculated as VT+ − VT−. Typical values are VT+ = 2.45 V and VT− = 1.65 V, yielding ΔVT ≈ 0.8 V. This margin rejects noise spikes up to ±400 mV peak-to-peak and ensures clean switching even with slowly ramping inputs like thermistor-based thresholds or debounced switch signals.

Is SN74HCS30DR pin-compatible with older 74HC30 devices?

No - SN74HCS30DR is not pin-compatible with standard 74HC30. While both are 8-input NAND gates in 14-pin SOIC packages, SN74HCS30DR features Schmitt-trigger inputs (with hysteresis and different threshold voltages), whereas 74HC30 uses standard CMOS inputs. Their pinouts match (A–H inputs, Y output, VCC, GND, NCs), but electrical behavior differs significantly: SN74HCS30DR tolerates slow/noisy edges and has higher input leakage tolerance, while 74HC30 requires faster edges and tighter noise control. Direct substitution may cause functional failure in noise-prone environments.