EM3028V3TP14B Equivalent & Substitute Parts

Part Overview

The EM3028V3TP14B is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality manufactured by EM Microelectronic. This device operates as a 43-byte memory RTC with I2C/2-Wire Serial interface, designed for applications requiring accurate timekeeping with battery backup capability. The part is currently in Active product status with 891 pieces in stock.

Substitute parts are necessary when the original EM3028V3TP14B becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design modifications necessitate different electrical specifications while maintaining core RTC functionality.

Key Parameters

Parameter	EM3028V3TP14B
Manufacturer	EM Microelectronic
Category	Clock/Timing
Type	Clock/Calendar
Interface	I2C, 2-Wire Serial
Package / Case	14-TSSOP (0.173", 4.40mm Width)
Voltage - Supply	1.1V ~ 5.5V
Voltage - Supply, Battery	1.1V ~ 5.5V
Current - Timekeeping (Max)	0.4µA @ 5V
Operating Temperature	-40°C ~ 85°C
Memory Size	43B
Time Format	HH:MM:SS:hh (12/24 hr)
Date Format	YY-MM-DD-dd
Features	Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Trickle-Charger
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)
Product Status	Active

Substitute Part Grouping Explanation

Substitution of the EM3028V3TP14B is determined by the following critical parameters:

Interface Compatibility: All substitute parts must support I2C/2-Wire Serial communication protocol to maintain firmware and circuit compatibility.

Voltage Supply Range: The original part operates across 1.1V to 5.5V. Substitute parts must support overlapping voltage ranges to function in the same power supply environment.

Operating Temperature Range: All substitutes must maintain the -40°C to 85°C operating temperature specification.

Package Type: The 14-TSSOP package is specific to the EM3028V3TP14B. Substitute parts may use alternative surface-mount packages (8-SOIC, 8-TSSOP, 8-MSOP, 16-SOIC) provided the application circuit board layout can accommodate the different pin count and physical dimensions.

Memory and Features: The original part includes 43 bytes of memory with Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, and Trickle-Charger features. Substitute parts may have different memory sizes and feature sets, but must retain core RTC functionality (Clock/Calendar with I2C interface).

Time and Date Format: All substitutes must support at minimum 12/24-hour time format and YY-MM-DD-dd date format.

Parameter Comparison

Parameter	EM3028V3TP14B	BQ32002D	BU9873FVM-GTTR	DS1308U-18+	DS1308U-3+T	DS1337C#	DS1338Z-18+	DS1338Z-33+	DS1340C-3#	DS1342U+T&R	DS1388Z-33+T&R
Manufacturer	EM Microelectronic	Texas Instruments	Rohm Semiconductor	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
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
Package / Case	14-TSSOP (0.173", 4.40mm)	8-SOIC (0.154", 3.90mm)	8-MSOP (0.110", 2.80mm)	8-TSSOP, 8-MSOP (0.118", 3.00mm)	8-TSSOP, 8-MSOP (0.118", 3.00mm)	16-SOIC (0.295", 7.50mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	16-SOIC (0.295", 7.50mm)	8-TSSOP, 8-MSOP (0.118", 3.00mm)	8-SOIC (0.154", 3.90mm)
Voltage - Supply	1.1V ~ 5.5V	3V ~ 3.6V	1.8V ~ 5.5V	1.71V ~ 5.5V	2.7V ~ 5.5V	1.8V ~ 5.5V	1.71V ~ 5.5V	3V ~ 5.5V	2.7V ~ 5.5V	1.8V ~ 5.5V	2.97V ~ 3.63V
Voltage - Supply, Battery	1.1V ~ 5.5V	1.4V ~ 3.6V	-	1.3V ~ 5.5V	1.3V ~ 5.5V	-	1.3V ~ 3.7V	1.3V ~ 3.7V	1.3V ~ 3.7V	-	1.3V ~ 5.5V
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	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Time Format	HH:MM:SS:hh (12/24 hr)	HH:MM:SS (24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS:hh (12/24 hr)
Date Format	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd
Memory Size	43B	-	-	56B	56B	-	56B	56B	-	-	512B
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Not For New Designs	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compatibility):

The DS1338Z-33+ and DS1338Z-18+ from Analog Devices Inc./Maxim Integrated are the most direct functional equivalents. Both devices maintain I2C/2-Wire Serial interface, support 12/24-hour time format with YY-MM-DD-dd date format, and operate within the -40°C to 85°C temperature range. The DS1338Z-33+ specifically supports the 3V to 5.5V supply voltage range, matching the upper operating range of the EM3028V3TP14B. Both parts are ROHS3 compliant and in Active product status. The primary difference is package format (8-SOIC versus 14-TSSOP), which requires circuit board redesign.

The DS1308U-18+ and DS1308U-3+T offer 56 bytes of memory with NVSRAM and Square Wave Output features. Both maintain full I2C compatibility and the -40°C to 85°C operating temperature specification. The DS1308U-18+ supports 1.71V to 5.5V supply voltage, providing broader low-voltage capability than the original part. Both are in Active status and ROHS3 compliant.

Secondary Substitutes (Active Status, Feature Variations):

The DS1342U+T&R provides Alarm, Leap Year, and Square Wave Output features with ultra-low timekeeping current (0.6µA to 0.7µA at 3V to 5V). This part operates across 1.8V to 5.5V and is packaged in 8-TSSOP/8-MSOP format. It is in Active status and ROHS3 compliant.

The DS1388Z-33+T&R offers extended memory (512 bytes) with EEPROM, Supervisor, Trickle-Charger, and Watchdog Timer features. This part includes the subsecond time format (HH:MM:SS:hh) matching the original EM3028V3TP14B. However, the supply voltage range is restricted to 2.97V to 3.63V, limiting compatibility with lower voltage applications. The part is in Active status and ROHS3 compliant.

Conditional Substitutes (Status or Compliance Considerations):

The BU9873FVM-GTTR from Rohm Semiconductor is marked as "Not For New Designs" and should not be selected for new product development, despite meeting electrical specifications. This part is suitable only for legacy system maintenance or repair applications.

The BQ32002D from Texas Instruments operates within a restricted supply voltage range (3V to 3.6V) and supports only 24-hour time format, limiting its applicability to designs requiring 12-hour format operation.

The DS1337C# and DS1340C-3# are packaged in 16-SOIC format, requiring significant circuit board layout modifications compared to the original 14-TSSOP package.

Compliance Verification:

All recommended substitute parts maintain ROHS3 compliance and REACH Unaffected status, matching the original EM3028V3TP14B regulatory requirements. All parts operate within the -40°C to 85°C industrial temperature range.

Frequently Asked Questions (FAQ)

Q: Can I directly replace the EM3028V3TP14B with any of the listed substitute parts without circuit board modifications?

A: No. The EM3028V3TP14B uses a 14-TSSOP package. Most substitute parts use 8-SOIC, 8-TSSOP, 8-MSOP, or 16-SOIC packages. Different package types have different pin counts and physical dimensions, requiring circuit board redesign. Only parts with identical package specifications can be used as direct pin-for-pin replacements.

Q: What is the key difference between the DS1338Z-33+ and DS1338Z-18+?

A: Both parts are functionally equivalent with identical features (Leap Year, NVSRAM, Square Wave Output) and package format (8-SOIC). The primary difference is the supply voltage range: DS1338Z-33+ operates at 3V to 5.5V, while DS1338Z-18+ operates at 1.71V to 5.5V. The DS1338Z-18+ provides broader low-voltage compatibility. Current consumption also differs: DS1338Z-33+ draws 125µA to 200µA at 3.63V to 5.5V, while DS1338Z-18+ draws 100µA at 1.89V.

Q: Why is the BU9873FVM-GTTR marked as "Not For New Designs"?

A: The BU9873FVM-GTTR is in "Not For New Designs" product status, indicating that the manufacturer has discontinued active development and support for this part. While the part may still function in existing applications, it should not be selected for new product designs due to potential future unavailability and lack of manufacturer support.

Q: Does the DS1388Z-33+T&R provide better functionality than the EM3028V3TP14B?

A: The DS1388Z-33+T&R offers extended memory (512 bytes versus 43 bytes) and additional features including Supervisor and Watchdog Timer functions. However, its supply voltage range (2.97V to 3.63V) is more restricted than the original part (1.1V to 5.5V). This part is suitable only for applications operating within the 2.97V to 3.63V range.

Q: What is the significance of the Moisture Sensitivity Level (MSL) difference between the EM3028V3TP14B and substitute parts?

A: The EM3028V3TP14B has MSL 3 (168 hours), while most substitute parts have MSL 1 (Unlimited). MSL indicates the maximum time a component can be exposed to moisture before soldering. MSL 1 parts have no time restriction and are more robust for storage and handling. MSL 3 parts require more careful moisture control during manufacturing. Lower MSL values provide manufacturing flexibility.

Q: Can I use the BQ32002D as a substitute if my application only requires 24-hour time format?

A: The BQ32002D supports only 24-hour time format and operates within 3V to 3.6V supply voltage. If your application requires 12-hour format capability or operates outside the 3V to 3.6V range, this part is not suitable. Additionally, the BQ32002D has no specified battery supply voltage range, which may limit backup power functionality.

Q: What are the key parameters I should verify before selecting a substitute part?

A: Verify the following parameters: (1) I2C/2-Wire Serial interface compatibility, (2) Supply voltage range overlap with your application, (3) Operating temperature range (-40°C to 85°C), (4) Package type and pin count compatibility with your circuit board, (5) Time format requirements (12/24 hour), (6) Memory size and feature requirements (Alarm, EEPROM, Trickle-Charger, etc.), (7) Product status (Active versus Not For New Designs), and (8) RoHS and REACH compliance requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference document are ROHS3 compliant and REACH Unaffected, matching the regulatory compliance of the original EM3028V3TP14B.

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