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Equivalent & Substitute Parts for X1226V8IT2
Part Overview
The X1226V8IT2 is a Real Time Clock (RTC) IC with Clock/Calendar functionality manufactured by Renesas Electronics Corporation. This device operates as a 2-Wire Serial I2C interface component in an 8-TSSOP surface mount package. The X1226V8IT2 is classified as obsolete, which necessitates identification of functionally equivalent substitute components for new designs and ongoing production requirements. Substitute parts must maintain compatibility across electrical specifications, interface protocols, and mechanical packaging constraints.
Substiute Parts
Key Parameters
| Parameter | X1226V8IT2 Specification |
|---|---|
| Manufacturer | Renesas Electronics Corporation |
| Product Status | Obsolete |
| Type | Clock/Calendar |
| Interface | I2C, 2-Wire Serial |
| Package / Case | 8-TSSOP (0.173", 4.40mm Width) |
| Voltage - Supply | 2.7V ~ 5.5V |
| Voltage - Supply, Battery | 1.8V ~ 5.5V |
| Current - Timekeeping (Max) | 10µA ~ 20µA @ 2.7V ~ 5V |
| Operating Temperature | -40°C ~ 85°C |
| Time Format | HH:MM:SS (12/24 hr) |
| Date Format | YY-MM-DD-dd |
| Features | Alarm, Leap Year |
| Mounting Type | Surface Mount |
| RoHS Status | RoHS non-compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the X1226V8IT2 is determined by the following critical parameters:
Primary Compatibility Criteria:
- Interface Protocol: I2C, 2-Wire Serial (mandatory match)
- Time Format: HH:MM:SS with 12/24 hour capability (mandatory match)
- Date Format: YY-MM-DD-dd (mandatory match)
- Operating Temperature Range: -40°C ~ 85°C (mandatory match)
- Supply Voltage Overlap: Minimum 2.7V ~ 5.5V operating range
- Mounting Type: Surface Mount (mandatory match)
Secondary Compatibility Criteria:
- Package compatibility: 8-pin configurations (8-TSSOP, 8-MSOP, 8-SOIC acceptable with PCB layout verification)
- Features: Alarm and Leap Year support (baseline requirement)
- Current consumption: Timekeeping current ≤ 20µA preferred for battery-backed operation
Substitute parts are grouped into two categories:
Category A - Direct Package Match (8-TSSOP): ISL12026IVZ-T and DS1337U+T&R maintain identical 8-TSSOP packaging, enabling direct footprint compatibility without PCB redesign.
Category B - Alternative Package (8-SOIC, 8-MSOP, Module): DS1338C-33#T&R, DS1338U-18+T&R, DS1339AU+T, DS1340C-33#, M41T01M6F, BQ32000DR, and module-based alternatives (AB-RTCMC series) require PCB layout modification but maintain full electrical compatibility within specified voltage and interface parameters.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Package / Case | Voltage - Supply | Voltage - Battery | Current - Timekeeping (Max) | Time Format | Date Format | Interface | Features | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| X1226V8IT2 | Renesas | Obsolete | 8-TSSOP | 2.7V ~ 5.5V | 1.8V ~ 5.5V | 10µA ~ 20µA @ 2.7V ~ 5V | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | I2C, 2-Wire | Alarm, Leap Year | RoHS non-compliant |
| ISL12026IVZ-T | Renesas | Active | 8-TSSOP | 2.7V ~ 5.5V | 1.8V ~ 5.5V | 10µA ~ 20µA @ 2.7V ~ 5.5V | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | I2C, 2-Wire | Alarm, Leap Year | ROHS3 Compliant |
| DS1337U+T&R | Analog Devices/Maxim | Active | 8-TSSOP, 8-MSOP | 1.8V ~ 5.5V | — | 0.6µA @ 1.3V ~ 1.8V | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | I2C, 2-Wire | Alarm, Leap Year, Square Wave Output | ROHS3 Compliant |
| DS1338U-18+T&R | Analog Devices/Maxim | Active | 8-TSSOP, 8-MSOP | 1.71V ~ 5.5V | 1.3V ~ 3.7V | 100µA @ 1.89V | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | I2C, 2-Wire | Leap Year, NVSRAM, Square Wave Output | ROHS3 Compliant |
| DS1338C-33#T&R | Analog Devices/Maxim | Active | 16-SOIC | 3V ~ 5.5V | 1.3V ~ 3.7V | 125µA ~ 200µA @ 3.63V ~ 5.5V | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | I2C, 2-Wire | Leap Year, NVSRAM, Square Wave Output | ROHS3 Compliant |
| DS1339AU+T | Analog Devices/Maxim | Active | 8-TSSOP, 8-MSOP | 1.71V ~ 5.5V | 1.3V ~ 3.7V | 200µA @ 1.71V ~ 5.5V | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | I2C, 2-Wire | Alarm, Leap Year, Square Wave Output, Trickle-Charger | ROHS3 Compliant |
| DS1340C-33# | Analog Devices/Maxim | Active | 16-SOIC | 2.97V ~ 5.5V | 1.3V ~ 5.5V | 150µA @ 5.5V | HH:MM:SS (24 hr) | YY-MM-DD-dd | I2C, 2-Wire | Leap Year, Trickle-Charger | ROHS3 Compliant |
| M41T01M6F | STMicroelectronics | Active | 8-SOIC | 2V ~ 5.5V | 2.5V ~ 4.6V | 70µA @ 2V ~ 5.5V | HH:MM:SS | YY-MM-DD-dd | I2C, 2-Wire | Leap Year | ROHS3 Compliant |
| BQ32000DR | Texas Instruments | Active | 8-SOIC | 3V ~ 3.6V | 1.4V ~ 3.6V | 100µA @ 3.3V | HH:MM:SS (24 hr) | YY-MM-DD-dd | I2C, 2-Wire | Leap Year, Square Wave Output, Trickle-Charger | ROHS3 Compliant |
| AB-RTCMC-32.768KHZ-AIGZ-S7-T | Abracon LLC | Active | 8-WCDFN | 1V ~ 4.4V | — | 0.4µA ~ 0.95µA @ 1V ~ 4.4V | HH:MM:SS:hh (24 hr) | YY-MM-DD-dd | I2C, 2-Wire | Alarm, Leap Year, Watchdog Timer | ROHS3 Compliant |
| AB-RTCMC-32.768KHZ-IBO5-S3-T | Abracon LLC | Not For New Designs | Module | 1.5V ~ 3.6V | 1.4V ~ 3.6V | 0.29µA ~ 0.33µA @ 1.8V ~ 3V | HH:MM:SS:hh (24 hr) | YY-MM-DD-dd | I2C, 2-Wire | Alarm, Square Wave Output, SRAM, Trickle Charge, Watchdog Timer | ROHS3 Compliant |
Engineering Selection Recommendations
For Direct Replacement (No PCB Redesign):
ISL12026IVZ-T is the primary substitute for X1226V8IT2. Both components share identical 8-TSSOP packaging, matching supply voltage range (2.7V ~ 5.5V), battery voltage range (1.8V ~ 5.5V), and timekeeping current specifications (10µA ~ 20µA). ISL12026IVZ-T is manufactured by Renesas Electronics Corporation and maintains Active product status with ROHS3 compliance, addressing the obsolescence of the original part.
For Applications Requiring Enhanced Compliance:
DS1337U+T&R and DS1338U-18+T&R offer Active product status and ROHS3 compliance. DS1337U+T&R provides lower timekeeping current (0.6µA @ 1.3V ~ 1.8V) and operates across 1.8V ~ 5.5V supply range. DS1338U-18+T&R includes 56B NVSRAM and operates across 1.71V ~ 5.5V with 100µA timekeeping current. Both are available in 8-TSSOP or 8-MSOP packages.
For Applications with Relaxed Package Constraints:
DS1339AU+T provides comprehensive features including Alarm, Leap Year, Square Wave Output, and Trickle-Charger functionality in 8-TSSOP or 8-MSOP packages. M41T01M6F (STMicroelectronics, 8-SOIC) and BQ32000DR (Texas Instruments, 8-SOIC) are suitable alternatives when package footprint modification is acceptable.
For Ultra-Low Power Applications:
AB-RTCMC-32.768KHZ-AIGZ-S7-T (Abracon LLC) delivers exceptional timekeeping current of 0.4µA ~ 0.95µA @ 1V ~ 4.4V with integrated Watchdog Timer functionality. This component operates across extended low-voltage range (1V ~ 4.4V) and is ROHS3 compliant. Package is 8-WCDFN, requiring PCB layout modification.
Compliance Consideration:
All recommended substitutes maintain ROHS3 compliance, addressing the RoHS non-compliant status of the obsolete X1226V8IT2. This is critical for new design certifications and regulatory requirements.
Frequently Asked Questions (FAQ)
Q: Can DS1340C-33# replace X1226V8IT2 directly on the PCB?
A: No. DS1340C-33# uses 16-SOIC packaging versus the 8-TSSOP of X1226V8IT2. PCB layout modification is required. However, electrical compatibility is maintained across I2C interface, time/date formats, and operating temperature range. Supply voltage range differs slightly (2.97V ~ 5.5V vs. 2.7V ~ 5.5V), which may affect low-voltage applications.
Q: What is the key difference between ISL12026IVZ-T and DS1337U+T&R?
A: ISL12026IVZ-T maintains identical 8-TSSOP packaging and voltage specifications to X1226V8IT2, enabling direct substitution. DS1337U+T&R offers lower timekeeping current (0.6µA vs. 10µA ~ 20µA) and extended low-voltage operation (1.8V minimum), but operates across 1.8V ~ 5.5V supply range. DS1337U+T&R is available in 8-TSSOP or 8-MSOP packages.
Q: Are module-based alternatives (AB-RTCMC series) suitable for production designs?
A: AB-RTCMC-32.768KHZ-AIGZ-S7-T is Active and ROHS3 compliant, suitable for new designs. AB-RTCMC-32.768KHZ-IBO5-S3-T is marked "Not For New Designs" and should not be selected for production applications. Module-based components require integration verification and are typically used in specialized applications requiring integrated oscillator and RTC functionality.
Q: What is the impact of timekeeping current differences on battery life?
A: Timekeeping current directly affects battery backup duration. X1226V8IT2 specifies 10µA ~ 20µA. AB-RTCMC-32.768KHZ-AIGZ-S7-T operates at 0.4µA ~ 0.95µA, extending battery life proportionally. DS1337U+T&R at 0.6µA provides superior battery efficiency. Selection depends on application battery capacity and required backup duration.
Q: Can I use BQ32000DR in a 2.7V application?
A: No. BQ32000DR minimum supply voltage is 3V. X1226V8IT2 operates down to 2.7V. For applications requiring 2.7V operation, select ISL12026IVZ-T, DS1337U+T&R, or M41T01M6F, which support lower voltage thresholds.
Q: What packaging options are available for I2C RTC substitutes?
A: Available packages include 8-TSSOP (ISL12026IVZ-T, DS1337U+T&R, DS1338U-18+T&R, DS1339AU+T), 8-MSOP (DS1337U+T&R, DS1338U-18+T&R, DS1339AU+T), 8-SOIC (M41T01M6F, BQ32000DR), 16-SOIC (DS1338C-33#T&R, DS1340C-33#), 8-WCDFN (AB-RTCMC-32.768KHZ-AIGZ-S7-T), and Module (AB-RTCMC-32.768KHZ-IBO5-S3-T). Direct 8-TSSOP match is available only with ISL12026IVZ-T.
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