Z8F042APJ020SC Equivalent & Substitute Parts

Part Overview

The Z8F042APJ020SC is an 8-bit microcontroller from Zilog's eZ8 Encore!® XP® series, featuring 4KB FLASH program memory, 1KB RAM, and 128 bytes EEPROM. This device integrates 23 I/O pins, on-chip analog-to-digital conversion (8x10-bit), and peripheral functions including PWM, watchdog timer, and temperature sensor. The part operates at 20MHz with a supply voltage range of 2.7V to 3.6V and is housed in a 28-pin DIP package.

The Z8F042APJ020SC is classified as obsolete. Locating equivalent substitute parts is necessary for ongoing system support, design updates, and procurement continuity when original inventory becomes unavailable.

Key Parameters

Parameter	Value
Core Processor	eZ8
Core Size	8-Bit
Speed	20MHz
Program Memory Size	4KB (4K x 8)
Program Memory Type	FLASH
RAM Size	1K x 8
EEPROM Size	128 x 8
Number of I/O	23
Voltage Supply (Vcc/Vdd)	2.7V ~ 3.6V
Data Converters	A/D 8x10b
Oscillator Type	Internal
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Through Hole
Package / Case	28-DIP (0.600", 15.24mm)
Connectivity	IrDA, UART/USART
Peripherals	Brown-out Detect/Reset, LED, LVD, POR, PWM, Temp Sensor, WDT

Substitute Part Grouping Explanation

Substitution of the Z8F042APJ020SC is determined by strict equivalence across the following critical parameters:

Core Architecture: eZ8 processor family
Memory Configuration: 4KB FLASH, 1KB RAM, 128 bytes EEPROM
Performance: 20MHz clock speed
I/O Count: 23 pins
Voltage Range: 2.7V to 3.6V supply compatibility
Analog Capability: 8-channel 10-bit A/D converter
Package: 28-pin DIP form factor with 0.600" (15.24mm) pitch
Peripheral Set: Identical feature set including PWM, WDT, temperature sensor, and communication interfaces

The Z8F042APJ020SG2156 meets all these criteria and is therefore a direct functional equivalent. Differences are limited to product status (active vs. obsolete) and packaging format (tube vs. standard), which do not affect electrical or mechanical compatibility.

Parameter Comparison

Parameter	Z8F042APJ020SC	Z8F042APJ020SG2156	Match
Manufacturer	Zilog	Zilog	✓
Series	Encore!® XP®	Encore!® XP®	✓
Core Processor	eZ8	eZ8	✓
Core Size	8-Bit	8-Bit	✓
Speed	20MHz	20MHz	✓
Program Memory Size	4KB (4K x 8)	4KB (4K x 8)	✓
Program Memory Type	FLASH	FLASH	✓
RAM Size	1K x 8	1K x 8	✓
EEPROM Size	128 x 8	128 x 8	✓
Number of I/O	23	23	✓
Voltage Supply (Vcc/Vdd)	2.7V ~ 3.6V	2.7V ~ 3.6V	✓
Data Converters	A/D 8x10b	A/D 8x10b	✓
Oscillator Type	Internal	Internal	✓
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	✓
Mounting Type	Through Hole	Through Hole	✓
Package / Case	28-DIP (0.600", 15.24mm)	28-DIP (0.600", 15.24mm)	✓
Connectivity	IrDA, UART/USART	IrDA, UART/USART	✓
Peripherals	Brown-out Detect/Reset, LED, LVD, POR, PWM, Temp Sensor, WDT	Brown-out Detect/Reset, LED, LVD, POR, PWM, Temp Sensor, WDT	✓
Product Status	Obsolete	Active	—
RoHS Status	RoHS non-compliant	ROHS3 Compliant	—
Packaging Format	Standard	Tube	—

Engineering Selection Recommendations

The Z8F042APJ020SG2156 is the direct substitute for the Z8F042APJ020SC. All electrical and mechanical parameters are identical, ensuring pin-for-pin and functional compatibility.

Product Status Consideration: The Z8F042APJ020SC is obsolete, while the Z8F042APJ020SG2156 is active. Selection of the active part ensures long-term availability and supply chain continuity.

Compliance Consideration: The Z8F042APJ020SG2156 is ROHS3 compliant, whereas the Z8F042APJ020SC is RoHS non-compliant. For applications subject to RoHS regulations or customer requirements, the Z8F042APJ020SG2156 is the appropriate choice.

Packaging Consideration: The Z8F042APJ020SG2156 is supplied in tube packaging, while the Z8F042APJ020SC uses standard packaging. This difference does not affect electrical performance or board-level integration.

Frequently Asked Questions (FAQ)

Q: Can the Z8F042APJ020SG2156 replace the Z8F042APJ020SC in existing designs?

A: Yes. The Z8F042APJ020SG2156 is electrically and mechanically equivalent. All pin assignments, voltage ratings, memory configurations, and peripheral functions are identical. Direct substitution is possible without design modification.

Q: Are there differences in programming or firmware compatibility?

A: No. Both parts use the same eZ8 core architecture and instruction set. Firmware compiled for the Z8F042APJ020SC will execute identically on the Z8F042APJ020SG2156.

Q: What is the significance of the product status difference?

A: The Z8F042APJ020SC is classified as obsolete, indicating that Zilog no longer manufactures or supports this part. The Z8F042APJ020SG2156 is active, meaning it is currently in production and available through authorized distributors. For new designs or ongoing production, the active part is recommended.

Q: Does the RoHS compliance difference affect functionality?

A: No. RoHS compliance relates to material composition and environmental regulations, not electrical performance. The Z8F042APJ020SG2156's ROHS3 compliance makes it suitable for applications in regulated markets or where customer specifications mandate RoHS-compliant components.

Q: Are the 28-DIP packages physically identical?

A: Yes. Both parts use the same 28-pin DIP package with 0.600" (15.24mm) pitch. They are mechanically interchangeable on PCBs designed for this form factor.

Q: What is the difference between standard and tube packaging?

A: Tube packaging is a reel-based format used for automated assembly processes, while standard packaging typically refers to individual or bulk formats. The packaging format does not affect the component's electrical characteristics or board-level performance.

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