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PCA24S08D,112 EEPROM Memory IC Equivalent & Substitute Parts
Part Overview
The PCA24S08D,112 is an 8Kbit I2C EEPROM memory IC manufactured by NXP USA Inc., housed in an 8-SOIC package with a 400 kHz clock frequency. This component is classified as obsolete, necessitating identification of active substitute parts that maintain functional and electrical compatibility. Equivalent parts must preserve the core memory specifications (8Kbit capacity, 1K x 8 organization, I2C interface) while accommodating variations in clock frequency, voltage supply range, and operating temperature specifications.
Substiute Parts
Key Parameters
| Parameter | PCA24S08D,112 |
|---|---|
| Memory Size | 8Kbit |
| Memory Organization | 1K x 8 |
| Memory Interface | I2C |
| Clock Frequency | 400 kHz |
| Voltage Supply Range | 2.5V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Write Cycle Time | Not specified |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the PCA24S08D,112 is determined by strict adherence to the following electrical and mechanical parameters:
Core Compatibility Requirements:
- Memory capacity: 8Kbit (1K x 8 organization)
- Interface protocol: I2C
- Package type: 8-SOIC (0.154", 3.90mm Width)
- RoHS3 compliance
- Operating temperature range: -40°C minimum to 85°C maximum
Acceptable Parameter Variations:
- Clock frequency: 400 kHz or higher (1 MHz acceptable as faster operation)
- Voltage supply range: Must encompass or exceed the original 2.5V ~ 3.6V specification
- Write cycle time: 5ms standard across all substitutes
- Moisture sensitivity: MSL 1 or MSL 3 acceptable
Substitutes are grouped into two categories:
-
Direct Frequency Match (400 kHz): BR24G08FJ-3GTE2, BR24L08FJ-WE2, BR24S08FJ-WE2, BR24T08FJ-WE2, CAT24C08WI-G, CAV24C08WE-GT3, BR24A08FJ-WME2
-
Higher Frequency (1 MHz): AT24C08D-SSHM-B, AT24CS08-SSHM-T, BR24G08FJ-3AGTE2
All substitute parts maintain I2C protocol compatibility, 8-SOIC packaging, and ROHS3 compliance with the original component.
Parameter Comparison
| Part Number | Manufacturer | Memory Size | Clock Frequency | Voltage Supply | Operating Temp | Package | Product Status | MSL |
|---|---|---|---|---|---|---|---|---|
| PCA24S08D,112 | NXP USA Inc. | 8Kbit | 400 kHz | 2.5V ~ 3.6V | -40°C ~ 85°C | 8-SOIC | Obsolete | 1 |
| AT24C08D-SSHM-B | Microchip Technology | 8Kbit | 1 MHz | 1.7V ~ 3.6V | -40°C ~ 85°C | 8-SOIC | Active | 3 |
| AT24CS08-SSHM-T | Microchip Technology | 8Kbit | 1 MHz | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-SOIC | Active | 1 |
| BR24A08FJ-WME2 | Rohm Semiconductor | 8Kbit | 400 kHz | 2.5V ~ 5.5V | -40°C ~ 105°C | 8-SOIC | Active | 1 |
| BR24G08FJ-3AGTE2 | Rohm Semiconductor | 8Kbit | 1 MHz | 1.6V ~ 5.5V | -40°C ~ 85°C | 8-SOIC | Active | 1 |
| BR24G08FJ-3GTE2 | Rohm Semiconductor | 8Kbit | 400 kHz | 1.6V ~ 5.5V | -40°C ~ 85°C | 8-SOIC | Active | 1 |
| BR24L08FJ-WE2 | Rohm Semiconductor | 8Kbit | 400 kHz | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOIC | Active | 1 |
| BR24S08FJ-WE2 | Rohm Semiconductor | 8Kbit | 400 kHz | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-SOIC | Active | 1 |
| BR24T08FJ-WE2 | Rohm Semiconductor | 8Kbit | 400 kHz | 1.6V ~ 5.5V | -40°C ~ 85°C | 8-SOIC | Active | 1 |
| CAT24C08WI-G | Catalyst Semiconductor Inc. | 8Kbit | 400 kHz | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-SOIC | Active | 3 |
| CAV24C08WE-GT3 | onsemi | 8Kbit | 400 kHz | 2.5V ~ 5.5V | -40°C ~ 125°C | 8-SOIC | Active | 1 |
Engineering Selection Recommendations
Primary Substitutes (Recommended):
BR24G08FJ-3GTE2, BR24L08FJ-WE2, BR24S08FJ-WE2, and BR24T08FJ-WE2 are preferred substitutes. All are manufactured by Rohm Semiconductor with active product status, ROHS3 compliance, MSL 1 rating, and 400 kHz clock frequency matching the original specification. These parts maintain the 8-SOIC package and -40°C ~ 85°C operating temperature range. Voltage supply ranges exceed the original 2.5V ~ 3.6V specification, providing broader system compatibility.
Secondary Substitutes (Higher Frequency):
AT24CS08-SSHM-T (Microchip Technology) offers active status with MSL 1 rating and extended voltage range (1.7V ~ 5.5V). The 1 MHz clock frequency exceeds the original 400 kHz specification but remains compatible with I2C protocol. AT24C08D-SSHM-B provides similar advantages with MSL 3 rating.
Automotive-Grade Alternative:
CAV24C08WE-GT3 (onsemi) is AEC-Q100 qualified with extended operating temperature range (-40°C ~ 125°C), suitable for automotive applications. This part maintains 400 kHz frequency and MSL 1 rating.
Compatibility Considerations:
All substitute parts are ROHS3 compliant and maintain I2C protocol compatibility. Voltage supply ranges of substitute parts encompass or exceed the original 2.5V ~ 3.6V specification. The 8-SOIC package dimensions (0.154", 3.90mm Width) are identical across all parts, ensuring mechanical interchangeability on PCB layouts.
Frequently Asked Questions (FAQ)
Q: Can I use a 1 MHz I2C EEPROM as a substitute for the 400 kHz PCA24S08D,112?
A: Yes. I2C protocol supports backward compatibility with lower clock frequencies. A 1 MHz device operates at the lower 400 kHz bus speed when integrated into a 400 kHz system. AT24C08D-SSHM-B and AT24CS08-SSHM-T are valid substitutes with this characteristic.
Q: What is the significance of MSL (Moisture Sensitivity Level) in EEPROM selection?
A: MSL indicates the maximum time a component can be exposed to ambient conditions (23°C, 50% relative humidity) before soldering. MSL 1 (Unlimited) requires no special handling. MSL 3 (168 Hours) requires controlled storage and handling procedures. The original PCA24S08D,112 specifies MSL 1; substitutes with MSL 1 require no additional process changes.
Q: Are all substitute parts pin-compatible with the PCA24S08D,112?
A: All substitute parts use the 8-SOIC package with identical pin configuration and spacing (0.154", 3.90mm Width). Pin-to-pin compatibility is confirmed for direct PCB replacement without layout modifications.
Q: Which substitute offers the widest voltage supply range?
A: AT24CS08-SSHM-T and BR24G08FJ-3AGTE2 both support 1.7V ~ 5.5V (or 1.6V ~ 5.5V for BR24G08FJ-3AGTE2), providing the broadest voltage compatibility compared to the original 2.5V ~ 3.6V specification.
Q: Is the BR24G08FJ-3GTE2 suitable for high-volume production replacement?
A: Yes. BR24G08FJ-3GTE2 has active product status with 260,275 pieces in stock, ROHS3 compliance, MSL 1 rating, and 400 kHz frequency matching the original specification. This part is suitable for direct production substitution.
Q: What is the difference between BR24L08FJ-WE2 and BR24S08FJ-WE2?
A: Both parts are 400 kHz I2C EEPROMs in 8-SOIC packages with active status and MSL 1 rating. BR24L08FJ-WE2 supports 1.8V ~ 5.5V voltage range and is DiGi-Electronics Programmable Verified. BR24S08FJ-WE2 supports 1.7V ~ 5.5V voltage range and is also DiGi-Electronics Programmable Verified. Selection depends on minimum voltage requirement of the target application.
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