Toshiba Semiconductor and Storage 74HC175D

Overview

74HC175D from Toshiba is a quad D-type flip-flop with asynchronous clear, fabricated in silicon gate C2MOS technology. It provides four independent edge-triggered storage elements operating at up to 63 MHz (typ.) with supply voltage range 2.0–6.0 V and quiescent current ≤4.0 µA - used for synchronous data latching and state storage in digital control logic.

For engineers reviewing the 74HC175D datasheet, 74HC175D pinout, 74HC175D application, or 74HC175D equivalent, this device is selected for low-power, high-speed register functions in industrial control panels, serial-to-parallel data conversion, and clock-synchronized status capture where precise setup/hold timing and rail-to-rail CMOS compatibility are required.

Technical Context

The 74HC175D implements four identical D-type flip-flops sharing a common clock (CK) and asynchronous clear (CLR) input. Each flip-flop transfers the D-input value to Q and complementary Q̅ outputs on the positive-going edge of CK. CLR forces all Q outputs low and all Q̅ outputs high regardless of clock or D states.

All inputs include ESD protection diodes; propagation delays are balanced (t_PLH ≈ t_PHL); and operation is guaranteed across -40°C to +125°C with V_CC = 2.0–6.0 V. Unused inputs must be tied to V_CC or GND to prevent floating node instability.

Key Specifications

Pinout & Package

74HC175D is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package with standard 1.27 mm pitch, 10.2 mm × 7.5 mm body size, and 0.15 g typical weight.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad D-type flip-flop applications.

Compared with SN74HC175N and MC74HC175AD, the 74HC175D offers optimal balance of surface-mount compactness, commercial-grade performance, and cost efficiency for industrial and consumer control logic - without requiring PCB redesign or derating for standard ambient conditions.

Availability

74HC175D is available at Aetrix Electronics and suitable for industrial control logic, serial-to-parallel conversion, state machine register banks, and LED display scan latching requiring stable component supply across production lifecycles.

Supply support for 74HC175D 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

Toshiba Electronic Devices & Storage Corporation designs and manufactures high-reliability semiconductor components for industrial, automotive, and consumer applications, with emphasis on logic, power devices, and memory solutions.

The 74HC175D belongs to Toshiba's HC-series high-speed CMOS logic family, engineered for drop-in replacement of TTL in power-sensitive, noise-immune digital systems requiring rail-to-rail operation and wide temperature tolerance.

FAQ

What is the maximum clock frequency supported by the 74HC175D?

The 74HC175D achieves a typical maximum clock frequency of 63 MHz at V_CC = 5 V with C_L = 15 pF. At wider temperature ranges (–40°C to +125°C), the guaranteed minimum f_MAX drops to 24 MHz at 6 V, ensuring robust timing margin in demanding environments. This specification is measured under defined AC test conditions including input rise/fall times of 6 ns.

Does the 74HC175D support 3.3 V operation?

Yes, the 74HC175D operates over a supply range of 2.0 V to 6.0 V, making it fully compatible with 3.3 V systems. At V_CC = 3.3 V, DC parameters such as VIH (min 2.31 V) and VOL (max 0.33 V) remain valid, and AC performance scales predictably - e.g., f_MAX ≈ 40 MHz (typ.) with corresponding increase in propagation delay.

How does the asynchronous clear (CLR) function behave in the 74HC175D?

The CLR input on the 74HC175D is active-low and asynchronous: when pulled low, all four Q outputs immediately go LOW and all Q̅ outputs go HIGH, overriding any clock or D-input state. This action occurs independently of the clock edge and completes within t_PLH(CLR→Q) ≤ 21 ns (max) at V_CC = 6 V, enabling deterministic reset for safety-critical logic sequences.

What is the pinout compatibility of the 74HC175D with other 74HC175 variants?

The 74HC175D uses the industry-standard 16-pin SOIC pinout defined for 74HC175 devices, matching SN74HC175D (TI), MC74HC175AD (ON Semi), and 74HC175PW (NXP). All share identical pin assignments for CLK, CLR, D/Q/Q̅ terminals and power rails - enabling direct substitution in SOIC-16 footprints without layout modification.

Is the 74HC175D RoHS compliant?

Yes, the 74HC175D is RoHS compliant per EU Directive 2011/65/EU, with lead-free terminations and halogen-free molding compound. Toshiba confirms compliance in its official product documentation and environmental reports; full material declarations and test certificates are available upon request for qualifying customers.