STM32L073CZU6D Equivalent & Substitute Parts

Part Overview

The STM32L073CZU6D is an ARM Cortex-M0+ 32-bit microcontroller from STMicroelectronics, part of the STM32L0 series. This device integrates 192KB FLASH memory, 20KB RAM, and 6KB EEPROM in a 48-pin UFQFPN package. The microcontroller operates across a supply voltage range of 1.65V to 3.6V and supports multiple communication interfaces including I2C, SPI, UART/USART, USB, IrDA, and LINbus. With an active product status and ROHS3 compliance, the STM32L073CZU6D serves embedded applications requiring low-power operation and integrated peripheral functionality. Identifying equivalent substitute parts ensures design flexibility and supply chain continuity when the primary part becomes unavailable.

Key Parameters

Parameter	Value
Manufacturer Part Number	STM32L073CZU6D
Manufacturer	STMicroelectronics
Series	STM32L0
Core Processor	ARM Cortex-M0+
Core Size	32-Bit Single-Core
Speed	32MHz
Program Memory Size	192KB (192K x 8)
Program Memory Type	FLASH
RAM Size	20K x 8
EEPROM Size	6K x 8
Voltage Supply (Vcc/Vdd)	1.65V ~ 3.6V
Package / Case	48-UFQFN Exposed Pad
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C (TA)
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the STM32L073CZU6D are identified based on strict parametric equivalence across the following critical dimensions:

Core Architecture & Performance: ARM Cortex-M0+ processor, 32-bit single-core configuration, 32MHz clock speed

Memory Configuration: 192KB FLASH program memory, 20KB RAM, 6KB EEPROM

Electrical Specifications: Supply voltage range 1.65V to 3.6V, operating temperature -40°C to 85°C

Package & Mounting: 48-pin UFQFN with exposed pad, surface mount technology

Connectivity & Peripherals: I2C, SPI, UART/USART, USB, IrDA, LINbus interfaces; Brown-out Detect/Reset, DMA, I2S, LCD, POR, PWM, WDT peripherals

Compliance & Regulatory: ROHS3 compliance, REACH unaffected status

Parts meeting all these parameters are classified as parametric equivalents and direct substitutes.

Parameter Comparison

Parameter	STM32L073CZU6D	STM32L073CZU6
Manufacturer	STMicroelectronics	STMicroelectronics
Series	STM32L0	STM32L0
Core Processor	ARM Cortex-M0+	ARM Cortex-M0+
Core Size	32-Bit Single-Core	32-Bit Single-Core
Speed	32MHz	32MHz
Program Memory Size	192KB (192K x 8)	192KB (192K x 8)
RAM Size	20K x 8	20K x 8
EEPROM Size	6K x 8	6K x 8
Voltage Supply (Vcc/Vdd)	1.65V ~ 3.6V	1.65V ~ 3.6V
Data Converters	A/D 10x12b; D/A 2x12b	A/D 10x12b; D/A 2x12b
Connectivity	I2C, IrDA, LINbus, SPI, UART/USART, USB	I2C, IrDA, LINbus, SPI, UART/USART, USB
Peripherals	Brown-out Detect/Reset, DMA, I2S, LCD, POR, PWM, WDT	Brown-out Detect/Reset, DMA, I2S, LCD, POR, PWM, WDT
Number of I/O	37	37
Package / Case	48-UFQFN Exposed Pad	48-UFQFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Product Status	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The STM32L073CZU6 is a direct parametric equivalent to the STM32L073CZU6D. Both devices share identical core architecture, memory configuration, electrical specifications, package format, and peripheral integration. Both maintain active product status with ROHS3 compliance and REACH unaffected designation, ensuring regulatory alignment for current and future applications.

Selection between these parts should be based on availability, lead time, and inventory status rather than technical differentiation. The STM32L073CZU6 variant offers higher current inventory availability (3100 pieces) compared to the STM32L073CZU6D (974 pieces), making it suitable for high-volume production requirements or extended supply chain planning.

Frequently Asked Questions (FAQ)

Q: Are STM32L073CZU6D and STM32L073CZU6 pin-compatible?

A: Yes. Both devices use the 48-pin UFQFN package with identical pinout, electrical characteristics, and functional assignments. Direct PCB substitution is supported without layout modifications.

Q: Can I use STM32L073CZU6 as a drop-in replacement for STM32L073CZU6D?

A: Yes. The devices are parametrically equivalent across all critical specifications including processor architecture, memory capacity, voltage supply range, operating temperature, and peripheral functionality. No firmware or hardware redesign is required.

Q: What are the key differences between these part numbers?

A: The part numbers differ only in their suffix designation (D vs. no suffix). All functional and electrical parameters remain identical. The difference reflects internal STMicroelectronics manufacturing or distribution tracking and does not impact device performance or compatibility.

Q: Are both parts suitable for low-power applications?

A: Yes. Both STM32L073CZU6D and STM32L073CZU6 are members of the STM32L0 low-power microcontroller series, designed for battery-powered and energy-constrained embedded systems. They support the full range of low-power modes and peripheral configurations inherent to the STM32L0 architecture.

Q: What is the moisture sensitivity level for these devices?

A: Both parts carry MSL 3 (168 Hours) rating, indicating standard moisture sensitivity. Standard moisture control procedures during storage, handling, and assembly are required to maintain device reliability.

Q: Are these devices RoHS compliant?

A: Yes. Both STM32L073CZU6D and STM32L073CZU6 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for commercial and industrial applications.

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