AB0801-T3 Real Time Clock IC Equivalent & Substitute Parts

Part Overview

The AB0801-T3 is a Real Time Clock (RTC) IC with Clock/Calendar functionality manufactured by Abracon LLC. It features I2C/2-Wire Serial interface, alarm capability, leap year support, and trickle-charger functionality in a 16-VFQFN Exposed Pad package. The part is currently obsolete, making substitute components necessary for new designs and ongoing production requirements. Equivalent and substitute parts maintain core RTC functionality while offering active product status and enhanced feature sets.

Key Parameters

Parameter	AB0801-T3 Specification
Manufacturer	Abracon LLC
Product Status	Obsolete
Category	Clock/Timing
Type	Clock/Calendar
Interface	I2C, 2-Wire Serial
Package / Case	16-VFQFN Exposed Pad
Supplier Device Package	16-QFN (3x3)
Voltage - Supply	1.7V ~ 3.6V
Voltage - Supply, Battery	1.5V ~ 3.6V
Current - Timekeeping (Max)	0.17µA ~ 0.22µA @ 1.8V ~ 3V
Operating Temperature	-40°C ~ 85°C
Time Format	HH:MM:SS:hh
Date Format	YY-MM-DD-dd
Features	Alarm, Leap Year, Trickle-Charger
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the AB0801-T3 are grouped based on the following substitution criteria:

Primary Compatibility Parameters:

Interface: I2C, 2-Wire Serial (mandatory)
Operating Temperature: -40°C ~ 85°C (mandatory)
RoHS Status: ROHS3 Compliant (mandatory)
Product Status: Active (required for ongoing availability)

Secondary Compatibility Parameters:

Time Format: HH:MM:SS with hour format support
Date Format: YY-MM-DD-dd
Features: Alarm and Leap Year support (core functionality)
Voltage Supply Range: Overlap with 1.7V ~ 3.6V or extended range
Package Type: Surface Mount (QFN, TSSOP, MSOP, SOIC, WDFN variants acceptable)

Grouping Categories:

Group 1: Direct Abracon Equivalent

AB0805-T3: Enhanced version with 256B SRAM, Watchdog Timer, identical electrical specifications and package

Group 2: Renesas Electronics Substitutes

1338-31DVGI, 1338-31DVGI8: 56B memory, 8-MSOP package, extended voltage supply range
ISL12026AIVZ: 8-TSSOP package, alarm and leap year features
ISL12058IBZ-T, ISL12058IRTZ-T: Low power consumption (0.65µA @ 1.8V), 8-SOIC and 8-WDFN packages

Group 3: Texas Instruments Substitute

BQ32000D: 8-SOIC package, trickle-charger, leap year support

Group 4: Analog Devices Inc./Maxim Integrated Substitutes

DS1339U-2+T&R: 8-TSSOP package, alarm, trickle-charger, wide voltage range
DS1340Z-33+: 8-SOIC package, trickle-charger, 24-hour format
DS1342U+: 8-TSSOP package, alarm, ultra-low power (0.6µA ~ 0.7µA @ 3V ~ 5V)

Parameter Comparison

Part Number	Manufacturer	Package	Interface	Voltage Supply	Battery Voltage	Timekeeping Current (Max)	Operating Temp	Features	Product Status	RoHS
AB0801-T3	Abracon LLC	16-VFQFN	I2C, 2-Wire	1.7V ~ 3.6V	1.5V ~ 3.6V	0.17µA ~ 0.22µA @ 1.8V ~ 3V	-40°C ~ 85°C	Alarm, Leap Year, Trickle-Charger	Obsolete	ROHS3
AB0805-T3	Abracon LLC	16-VFQFN	I2C, 2-Wire	1.7V ~ 3.6V	1.5V ~ 3.6V	0.17µA ~ 0.22µA @ 1.8V ~ 3V	-40°C ~ 85°C	Alarm, Leap Year, SRAM, Trickle-Charger, Watchdog Timer	Active	ROHS3
1338-31DVGI	Renesas Electronics	8-MSOP	I2C, 2-Wire	3.3V ~ 5.5V	1.3V ~ 3.7V	5µA @ 3.63V ~ 5.5V	-40°C ~ 85°C	Leap Year, NVSRAM, Square Wave Output	Active	ROHS3
1338-31DVGI8	Renesas Electronics	8-MSOP	I2C, 2-Wire	3.3V ~ 5.5V	1.3V ~ 3.7V	5µA @ 3.63V ~ 5.5V	-40°C ~ 85°C	Leap Year, NVSRAM, Square Wave Output	Active	ROHS3
BQ32000D	Texas Instruments	8-SOIC	I2C, 2-Wire	3V ~ 3.6V	1.4V ~ 3.6V	100µA @ 3.3V	-40°C ~ 85°C	Leap Year, Square Wave Output, Trickle-Charger	Active	ROHS3
DS1339U-2+T&R	Analog Devices Inc./Maxim Integrated	8-TSSOP	I2C, 2-Wire	1.8V ~ 5.5V	1.3V ~ 3.7V	100µA @ 2.2V	-40°C ~ 85°C	Alarm, Leap Year, Square Wave Output, Trickle-Charger	Active	ROHS3
DS1340Z-33+	Analog Devices Inc./Maxim Integrated	8-SOIC	I2C, 2-Wire	2.97V ~ 5.5V	1.3V ~ 5.5V	150µA @ 5.5V	-40°C ~ 85°C	Leap Year, Trickle-Charger	Active	ROHS3
DS1342U+	Analog Devices Inc./Maxim Integrated	8-TSSOP	I2C, 2-Wire	1.8V ~ 5.5V	—	0.6µA ~ 0.7µA @ 3V ~ 5V	-40°C ~ 85°C	Alarm, Leap Year, Square Wave Output	Active	ROHS3
ISL12026AIVZ	Renesas Electronics	8-TSSOP	I2C, 2-Wire	2.7V ~ 5.5V	1.8V ~ 5.5V	10µA ~ 20µA @ 2.7V ~ 5.5V	-40°C ~ 85°C	Alarm, Leap Year	Active	ROHS3
ISL12058IBZ-T	Renesas Electronics	8-SOIC	I2C, 2-Wire	1.8V ~ 3.6V	—	0.65µA @ 1.8V	-40°C ~ 85°C	Alarm, Leap Year	Active	ROHS3
ISL12058IRTZ-T	Renesas Electronics	8-WDFN	I2C, 2-Wire	1.8V ~ 3.6V	—	0.65µA @ 1.8V	-40°C ~ 85°C	Alarm, Leap Year	Active	ROHS3

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical and Mechanical Compatibility): AB0805-T3 is the recommended primary substitute. It maintains identical voltage specifications, operating temperature range, timekeeping current characteristics, and package footprint (16-VFQFN Exposed Pad) while offering active product status and enhanced features including 256B SRAM and Watchdog Timer functionality. Both parts are ROHS3 compliant with MSL 1 rating.

For Package-Constrained Designs (Smaller Footprint Required): When 16-QFN footprint cannot be accommodated, select from 8-pin alternatives based on voltage supply requirements:

DS1342U+ or ISL12058IBZ-T for low-voltage applications (1.8V ~ 3.6V supply range)
DS1339U-2+T&R for wide voltage range (1.8V ~ 5.5V) with alarm and trickle-charger features
ISL12026AIVZ for applications requiring extended battery voltage range (1.8V ~ 5.5V)

For Low-Power Applications: DS1342U+ (0.6µA ~ 0.7µA @ 3V ~ 5V) and ISL12058IBZ-T/ISL12058IRTZ-T (0.65µA @ 1.8V) offer superior timekeeping current performance compared to the AB0801-T3 baseline.

Compliance and Availability: All substitute parts maintain ROHS3 compliance and active product status. Inventory availability varies; verify current stock levels for production requirements. MSL ratings range from 1 (Unlimited) to 3 (168 Hours), affecting storage and handling protocols.

Frequently Asked Questions (FAQ)

Q: Can AB0805-T3 be used as a direct drop-in replacement for AB0801-T3? A: Yes. AB0805-T3 maintains identical package (16-VFQFN Exposed Pad), voltage specifications (1.7V ~ 3.6V supply, 1.5V ~ 3.6V battery), operating temperature range (-40°C ~ 85°C), and timekeeping current characteristics (0.17µA ~ 0.22µA @ 1.8V ~ 3V). The primary difference is enhanced functionality (256B SRAM, Watchdog Timer) and active product status.

Q: What are the key differences between 16-pin and 8-pin RTC substitutes? A: 16-pin packages (AB0801-T3, AB0805-T3) provide additional I/O pins and typically higher memory capacity. 8-pin alternatives (DS1339U-2+T&R, ISL12058IBZ-T, BQ32000D) reduce board space but may have different voltage supply ranges and feature sets. Pin-to-pin compatibility is not guaranteed; PCB layout redesign may be required.

Q: Which substitute is best for battery-backed operation? A: ISL12026AIVZ supports the widest battery voltage range (1.8V ~ 5.5V). For low-voltage battery applications (1.5V ~ 3.6V), AB0805-T3 maintains the original specification. DS1340Z-33+ supports extended battery voltage (1.3V ~ 5.5V) but requires higher supply voltage (2.97V minimum).

Q: Are all substitutes ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and are suitable for applications requiring environmental compliance certification.

Q: What is the impact of different MSL ratings on component handling? A: MSL 1 (Unlimited) parts like AB0801-T3, AB0805-T3, BQ32000D, DS1339U-2+T&R, and DS1340Z-33+ have no moisture sensitivity restrictions. MSL 2 (1 Year) and MSL 3 (168 Hours) parts require controlled storage environments and have limited shelf life after packaging opening. Verify storage conditions for ISL12058IBZ-T (MSL 2) and 1338-31DVGI variants (MSL 3).

Q: Can I use a 3.3V-only RTC (like 1338-31DVGI) in a 1.7V ~ 3.6V design? A: No. The 1338-31DVGI minimum supply voltage is 3.3V, which exceeds the AB0801-T3 lower operating limit of 1.7V. Use only substitutes with overlapping or extended voltage ranges for the target application.

Q: What is the difference between I2C and 2-Wire Serial interface? A: I2C and 2-Wire Serial are equivalent designations for the same two-wire communication protocol (SCL and SDA lines). All listed substitutes use identical interface standards and are compatible with existing I2C bus implementations.

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