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PIC16C55T-XTE/SS Equivalent & Substitute Parts
Part Overview
The PIC16C55T-XTE/SS is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, featuring 768B of OTP (One-Time Programmable) memory and 20 I/O pins in a 28-SSOP surface mount package. This device is classified as obsolete, making substitute parts necessary for new designs and ongoing production support. The identification of equivalent parts is based on matching core electrical specifications, memory configuration, package type, and operational parameters.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Technology |
| Core Processor | PIC |
| Core Size | 8-Bit |
| Speed | 4MHz |
| Program Memory Size | 768B (512 x 12) |
| Program Memory Type | OTP |
| RAM Size | 24 x 8 |
| Number of I/O | 20 |
| Voltage Supply (Vcc/Vdd) | 3.25V ~ 6V |
| Peripherals | POR, WDT |
| Mounting Type | Surface Mount |
| Package | 28-SSOP (0.209", 5.30mm Width) |
| Operating Temperature | -40°C ~ 125°C (TA) |
| RoHS Status | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the PIC16C55T-XTE/SS is determined by the following critical parameters:
- Core Architecture & Memory: 8-bit PIC processor with 768B OTP program memory (512 x 12 organization) and 24 x 8 RAM
- I/O Configuration: 20 I/O pins
- Operating Frequency: 4MHz
- Package Type: 28-SSOP surface mount package with identical physical dimensions
- Voltage Supply Range: Compatible supply voltage window (minimum 3.25V, maximum 6V)
- Peripheral Set: POR (Power-On Reset) and WDT (Watchdog Timer)
- Compliance: ROHS3 compliance and MSL Level 1 rating
The substitute part PIC16C55-XTI/SS matches all core electrical and mechanical parameters. Variations in product status (obsolete vs. active) and operating temperature range do not affect functional substitution when the application requirements fall within the substitute's specifications.
Parameter Comparison
| Parameter | PIC16C55T-XTE/SS (Main) | PIC16C55-XTI/SS (Substitute) |
|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology |
| Series | PIC® 16C | PIC® 16C |
| Core Size | 8-Bit | 8-Bit |
| Speed | 4MHz | 4MHz |
| Program Memory Size | 768B (512 x 12) | 768B (512 x 12) |
| Program Memory Type | OTP | OTP |
| RAM Size | 24 x 8 | 24 x 8 |
| Number of I/O | 20 | 20 |
| Voltage Supply (Vcc/Vdd) | 3.25V ~ 6V | 3V ~ 6.25V |
| Peripherals | POR, WDT | POR, WDT |
| Operating Temperature | -40°C ~ 125°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 28-SSOP (0.209", 5.30mm Width) | 28-SSOP (0.209", 5.30mm Width) |
| Product Status | Obsolete | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
The PIC16C55-XTI/SS is a direct functional substitute for the PIC16C55T-XTE/SS based on matching core specifications. The substitute part carries Active product status, ensuring continued availability and manufacturing support compared to the obsolete main part.
Both parts maintain ROHS3 compliance and MSL Level 1 rating, confirming equivalent environmental and handling characteristics. The substitute's voltage supply range (3V ~ 6.25V) encompasses the main part's range (3.25V ~ 6V), providing compatible operation across standard supply configurations.
The operating temperature range difference (-40°C ~ 85°C for the substitute versus -40°C ~ 125°C for the main part) requires evaluation against specific application requirements. Applications operating above 85°C must retain the original part or identify alternative solutions outside this substitute group.
Frequently Asked Questions (FAQ)
Q: Can PIC16C55-XTI/SS replace PIC16C55T-XTE/SS in existing designs?
A: Yes, for applications operating within the substitute's temperature range (-40°C to 85°C). The substitute matches all core electrical parameters, memory configuration, I/O count, and package specifications. Verify application temperature requirements before implementation.
Q: What is the primary difference between these parts?
A: The main part is obsolete; the substitute is active. The substitute has a slightly narrower maximum operating temperature (85°C vs. 125°C). All other electrical and mechanical specifications are identical.
Q: Are the packages physically identical?
A: Yes. Both parts use 28-SSOP surface mount packages with identical dimensions (0.209" × 5.30mm width), ensuring PCB layout compatibility without modification.
Q: Do both parts have the same voltage supply requirements?
A: Both operate within overlapping voltage ranges. The main part requires 3.25V ~ 6V; the substitute operates at 3V ~ 6.25V. Standard 5V and 3.3V supply designs are compatible with both.
Q: What compliance certifications apply to the substitute?
A: The substitute maintains ROHS3 compliance and MSL Level 1 (Unlimited) rating, matching the main part's environmental and handling specifications.
Q: Is the substitute programmable through DiGi-Electronics?
A: The substitute is verified as programmable through DiGi-Electronics, whereas the main part's programmability status is not verified.
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