AB0804-T3 Real Time Clock IC Equivalent & Substitute Parts

Part Overview

The AB0804-T3 is a Real Time Clock (RTC) IC with Clock/Calendar functionality manufactured by Abracon LLC. This device integrates a 256-byte I2C interface, 2-wire serial communication, and advanced features including alarm capability, leap year compensation, SRAM, trickle-charger, and watchdog timer functionality. The AB0804-T3 operates across a supply voltage range of 1.7V to 3.6V with battery backup support from 1.5V to 3.6V, making it suitable for low-power applications requiring accurate timekeeping.

The AB0804-T3 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Active alternatives with identical or compatible electrical and mechanical specifications are available from both Abracon LLC and third-party manufacturers.

Key Parameters

Parameter	AB0804-T3 Specification
Manufacturer	Abracon LLC
Product Type	Real Time Clock (RTC) IC Clock/Calendar
Memory Size	256B
Interface	I2C, 2-Wire Serial
Time Format	HH:MM:SS:hh
Date Format	YY-MM-DD-dd
Features	Alarm, Leap Year, SRAM, Trickle-Charger, Watchdog Timer
Voltage Supply (Operating)	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
Package / Case	16-VFQFN Exposed Pad
Supplier Device Package	16-QFN (3x3)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the AB0804-T3 are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution logic follows these parameters:

Critical Matching Parameters:

Interface Type: I2C, 2-Wire Serial (mandatory match)
Operating Voltage Range: 1.7V ~ 3.6V (or compatible overlap)
Battery Backup Voltage: 1.5V ~ 3.6V (or compatible overlap)
Operating Temperature Range: -40°C ~ 85°C (or compatible overlap)
Package Type: 16-VFQFN Exposed Pad or equivalent surface mount packages
RoHS Compliance: ROHS3 Compliant
Product Status: Active (preferred for ongoing availability)

Secondary Compatibility Parameters:

Memory Size: 256B (preferred match)
Time/Date Format: HH:MM:SS:hh and YY-MM-DD-dd (preferred match)
Features: Alarm, Leap Year, SRAM, Trickle-Charger, Watchdog Timer (preferred match)

Substitutes are categorized into two groups: direct equivalents from Abracon LLC (AB0805-T3, AB1805-T3) and cross-manufacturer alternatives from Renesas Electronics Corporation and Analog Devices Inc./Maxim Integrated. Cross-manufacturer substitutes may have different package configurations and feature sets but maintain core I2C RTC functionality with compatible electrical specifications.

Parameter Comparison

Parameter	AB0804-T3	AB0805-T3	AB1805-T3	1337AGDCGI8	1337AGDVGI	1337GDVGI	1339-31DCGI	DS1307+	DS1338C-18#	DS1338C-3#	DS1338U-18+T&R
Manufacturer	Abracon LLC	Abracon LLC	Abracon LLC	Renesas	Renesas	Renesas	Renesas	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
Interface	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial
Voltage Supply (Operating)	1.7V ~ 3.6V	1.7V ~ 3.6V	1.7V ~ 3.6V	1.8V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V	3.3V ~ 5.5V	4.5V ~ 5.5V	1.71V ~ 5.5V	2.7V ~ 5.5V	1.71V ~ 5.5V
Voltage Supply (Battery)	1.5V ~ 3.6V	1.5V ~ 3.6V	1.5V ~ 3.6V	—	—	—	1.3V ~ 3.7V	2V ~ 4.6V	1.3V ~ 3.7V	1.3V ~ 3.7V	1.3V ~ 3.7V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	16-VFQFN Exposed Pad	16-VFQFN Exposed Pad	16-VFQFN Exposed Pad	8-SOIC (0.154", 3.90mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-SOIC (0.154", 3.90mm Width)	8-DIP (0.300", 7.62mm)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Through Hole	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Direct Abracon LLC Equivalents (Preferred for Pin-Compatible Substitution):

AB0805-T3 and AB1805-T3 are the primary substitutes for AB0804-T3. Both parts maintain identical electrical specifications, feature sets, and package configuration (16-VFQFN Exposed Pad). AB0805-T3 is available in Cut Tape and Digi-Reel packaging with 21,300 units in stock. AB1805-T3 is available in Tape & Reel packaging with 5,287 units in stock. Both are classified as Active products, ensuring long-term availability and supply chain continuity. These substitutes require no circuit redesign and provide direct functional replacement.

Cross-Manufacturer Alternatives (For Design Flexibility):

Renesas Electronics Corporation and Analog Devices Inc./Maxim Integrated offer RTC IC alternatives with I2C interface compatibility. These alternatives differ in package configuration and feature implementation:

Renesas 1337 series (1337AGDCGI8, 1337AGDVGI, 1337GDVGI, 1339-31DCGI) provide I2C RTC functionality in 8-pin packages (SOIC, TSSOP, MSOP) with operating voltage ranges extending to 5.5V. These parts are suitable for applications requiring higher supply voltage tolerance or compact package footprints.
Analog Devices DS1307+ and DS1338 series provide I2C RTC functionality with 56-byte memory (versus 256-byte in AB0804-T3). DS1307+ is available in 8-DIP through-hole package. DS1338C-18# and DS1338C-3# are available in 16-SOIC surface mount packages. DS1338U-18+T&R is available in 8-TSSOP surface mount package. All Analog Devices alternatives are classified as Active products.

Selection Criteria:

For direct replacement without PCB redesign: Select AB0805-T3 or AB1805-T3
For applications requiring higher supply voltage tolerance (up to 5.5V): Select Renesas 1337 series or Analog Devices DS1338 series
For through-hole mounting applications: Select Analog Devices DS1307+
For compact surface mount packages: Select Renesas 1337AGDVGI, 1337GDVGI, or Analog Devices DS1338U-18+T&R

All recommended substitutes are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can AB0805-T3 or AB1805-T3 be used as direct replacements for AB0804-T3 without circuit modification?

A: Yes. AB0805-T3 and AB1805-T3 are direct functional equivalents with identical electrical specifications, feature sets, and 16-VFQFN Exposed Pad package configuration. No circuit redesign is required. The primary difference is product status (Active versus Obsolete) and packaging format (Cut Tape/Digi-Reel versus Tape & Reel).

Q: What are the key differences between Abracon LLC substitutes and cross-manufacturer alternatives?

A: Abracon LLC substitutes (AB0805-T3, AB1805-T3) maintain identical package and electrical specifications. Cross-manufacturer alternatives from Renesas and Analog Devices offer different package configurations (8-pin versus 16-pin), varying memory sizes (56-byte versus 256-byte), and extended supply voltage ranges (up to 5.5V). Cross-manufacturer substitutes require PCB redesign and firmware validation.

Q: Are Renesas 1337 series parts compatible with AB0804-T3 applications?

A: Renesas 1337 series parts provide I2C RTC functionality with compatible operating temperature range (-40°C to 85°C) and I2C interface. However, they use 8-pin packages (SOIC, TSSOP, MSOP) versus the 16-pin VFQFN package of AB0804-T3. Supply voltage ranges extend to 5.5V, providing broader compatibility with higher-voltage systems. PCB redesign is required for package migration.

Q: What is the memory difference between AB0804-T3 and Analog Devices DS1338 series?

A: AB0804-T3 provides 256-byte memory, while Analog Devices DS1338 series provides 56-byte memory. This difference affects the amount of non-volatile storage available for user data. Applications requiring extended data storage must account for this reduction when migrating to DS1338 alternatives.

Q: Can DS1307+ be used in new designs requiring surface mount components?

A: DS1307+ is available only in 8-DIP through-hole package configuration. For surface mount applications, select DS1338C-18#, DS1338C-3#, or DS1338U-18+T&R, which are available in SOIC and TSSOP surface mount packages.

Q: Are all substitute parts ROHS3 compliant and REACH unaffected?

A: Yes. All recommended substitute parts (AB0805-T3, AB1805-T3, Renesas 1337 series, and Analog Devices DS1307+ and DS1338 series) are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What packaging options are available for each substitute part?

A: AB0805-T3 is available in Cut Tape and Digi-Reel packaging. AB1805-T3 is available in Tape & Reel packaging. Renesas 1337 series parts are available in Tube or standard packaging. Analog Devices DS1307+ is available in Tube packaging. DS1338C-18# and DS1338C-3# are available in Tube packaging. DS1338U-18+T&R is available in Tape & Reel packaging. Packaging selection depends on production volume and assembly requirements.

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