STMicroelectronics M74HC595YTTR

Overview

M74HC595YTTR from STMicroelectronics is an automotive-grade 8-bit serial-in, parallel-out shift register with output latches and 3-state outputs, operating from 2 V to 6 V, delivering f_MAX = 59 MHz (typ.) at V_CC = 6 V, I_OH/I_OL ≥ 6 mA for QA–QH, and -40/+125 °C temperature range - used in automotive LED driver interfaces and industrial I/O expansion.

For engineers reviewing the M74HC595YTTR datasheet, M74HC595YTTR pinout, M74HC595YTTR application, or M74HC595YTTR equivalent, this page delivers verified functional identity, TSSOP16 package mapping, confirmed 16-pin terminal roles, automotive qualification status (AEC-Q100), and real-world timing behavior across V_CC = 2–6 V.

Technical Context

The device integrates two independent positive-edge-triggered registers: an 8-bit shift register accepting serial data via SI and clocked by SCK, and a separate 8-bit storage register loaded on RCK edges - enabling asynchronous latching of shifted data. Clear (SCLR) is asynchronous and active-low.

Output enable (G) controls high-impedance state for all QA–QH pins; QH′ provides cascading capability. Input protection includes HBM ESD rating of 2 kV, and VIH/VIL thresholds are specified as 28% V_CC min., ensuring robust noise immunity in noisy automotive environments.

Key Specifications

Pinout & Package

TSSOP16 package: 4.9 mm × 6.4 mm × 1.05 mm body, 0.65 mm pitch, lead-free and RoHS-compliant per ECOPACK® specifications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit shift register with storage latch applications.

Compared with SN74HC595PWR and 74LV595PW,118, the M74HC595YTTR uniquely combines automotive qualification, 6 V operation, and 59 MHz speed - making it the only choice for safety-critical or high-temperature serial-to-parallel conversion in certified vehicle subsystems.

Availability

M74HC595YTTR is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC I/O expansion, consumer appliance displays, and medical diagnostic panel indicators requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for M74HC595YTTR 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, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog/mixed-signal devices for automotive, industrial, and consumer markets.

The M74HC595YTTR belongs to ST's high-reliability HC logic family, engineered specifically for automotive signal conditioning and I/O extension where extended temperature operation, ESD robustness, and AEC-Q100 compliance are mandatory.

FAQ

What is the maximum clock frequency supported by M74HC595YTTR at 3.3 V?

At V_CC = 3.3 V and T_A = 25 °C, the maximum clock frequency (f_MAX) is 24 MHz (typ.) and 20 MHz (max.) over the full -40/+125 °C range, as specified in Table 7 of the datasheet. This ensures reliable operation in 3.3 V automotive infotainment and body control modules.

Can M74HC595YTTR be used in cascade mode with mixed supply voltages?

No - cascading requires matching V_CC levels across all devices in the chain. QH′ output swing is referenced to its local V_CC, so connecting it to SI of a device powered at a different voltage violates input voltage limits (VI = 0 to V_CC) and risks latch-up or incorrect logic interpretation.

Does the storage register retain data during SCLR assertion?

Yes. SCLR resets only the shift register; the storage register and its QA–QH outputs remain unaffected. This allows safe clearing of incoming data without disrupting currently displayed or driven outputs - essential for fault recovery in lighting or indicator systems.

Is there a minimum pulse width requirement for RCK when using 5 V supply?

Yes. At V_CC = 5 V and T_A = -55 to +125 °C, the minimum RCK high- and low-time (t_W(H)/t_W(L)) is 16 ns each, per Table 7. This defines the shortest usable clock period for guaranteed storage register capture and must be respected in FPGA or microcontroller timing constraints.