TL16C552FN UART Dual Channel Interface IC - Equivalent & Substitute Parts

Part Overview

The TL16C552FN is a dual-channel asynchronous communication element (UART) manufactured by Texas Instruments, housed in a 68-PLCC surface mount package. This interface IC provides two independent UART channels with 16-byte FIFOs, supporting data rates up to 1 Mbps and operating at 4.75V to 5.25V supply voltage. The device includes modem control and false start bit detection capabilities, making it suitable for printer port and legacy communication applications.

The TL16C552FN carries a Last Time Buy product status, indicating that Texas Instruments has discontinued active production. This status necessitates identifying equivalent and substitute parts to ensure design continuity and long-term component availability for new production runs and system maintenance.

Substiute Parts

TL16C552FN

Texas InstrumentsIn Stock: 2302TL16C552FN Datasheet

Current PartRFQ

TL16C752DPFBR

Texas InstrumentsIn Stock: 7010TL16C752DPFBR Datasheet

MFR RecommendedRFQ

TL16C552AFN

Texas InstrumentsIn Stock: 1821TL16C552AFN Datasheet

Parametric EquivalentRFQ

TL16C552AFNG4

Texas InstrumentsIn Stock: 837TL16C552AFNG4 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TL16C552FN are classified into two categories based on substitution criteria:

Parametric Equivalents maintain identical or near-identical electrical and mechanical specifications, allowing direct replacement in existing designs without circuit modification. These parts share the same base product number (TL16C552), package type (68-PLCC), channel configuration (2 DUART), FIFO depth (16 Byte), data rate (1 Mbps), and supply voltage range (4.75V ~ 5.25V). Parametric equivalents differ only in packaging format (Tube vs. standard packaging) or minor revision designations.

Manufacturer Recommended Substitute (TL16C752DPFBR) represents an enhanced alternative when design flexibility permits package and performance upgrades. This part maintains functional compatibility through dual UART channels and modem control, but introduces improvements in FIFO depth (64 Byte vs. 16 Byte), maximum data rate (3 Mbps vs. 1 Mbps), supply voltage flexibility (1.62V ~ 5.5V vs. 4.75V ~ 5.25V), and additional features (internal oscillator, timer/counter, IrDA encoder/decoder, auto flow control). The trade-off involves a different package type (48-TQFP vs. 68-PLCC), requiring PCB layout redesign.

Key parameters determining substitution eligibility:

• Number of UART channels (must be 2)
• Modem control capability (must be present)
• False start bit detection (must be present)
• Surface mount technology (required)
• RoHS3 compliance (required)

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (No Design Changes Required):

Select TL16C552AFN or TL16C552AFNG4 when immediate component substitution is necessary without PCB or firmware modifications. Both parts maintain identical electrical specifications and package dimensions to the TL16C552FN. TL16C552AFN carries Last Time Buy status with active inventory (1716 pcs), making it the preferred choice for near-term production. TL16C752AFNG4 is classified as Obsolete with limited inventory (802 pcs) and should be considered only when TL16C552AFN availability is exhausted. Both parametric equivalents retain ROHS3 compliance and MSL-3 moisture sensitivity ratings.

For Enhanced Performance (Design Modification Required):

Select TL16C752DPFBR when design flexibility permits package redesign and performance enhancement is beneficial. This part offers superior specifications including 64-byte FIFO (vs. 16-byte), 3 Mbps data rate capability (vs. 1 Mbps), expanded supply voltage range (1.62V ~ 5.5V), and integrated features (auto flow control, IrDA encoder/decoder, internal oscillator, timer/counter). The transition from 68-PLCC to 48-TQFP package requires PCB layout modification but delivers improved thermal characteristics and reduced board footprint. TL16C752DPFBR maintains Active product status with substantial inventory (6966 pcs) and improved MSL-2 moisture sensitivity rating, supporting long-term design continuity.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and REACH Unaffected status, meeting regulatory requirements for new production. The TL16C752DPFBR's improved moisture sensitivity level (MSL-2 vs. MSL-3) provides extended shelf life and reduced handling risk in manufacturing environments.

Frequently Asked Questions (FAQ)

Q: Can TL16C552AFN be used as a direct replacement for TL16C552FN?

A: Yes. TL16C552AFN is a parametric equivalent with identical electrical specifications, channel configuration, FIFO depth, data rate, supply voltage range, and package dimensions. The only difference is packaging format (Tube vs. standard). No circuit or PCB modifications are required.

Q: What is the primary difference between parametric equivalents and the recommended substitute?

A: Parametric equivalents (TL16C552AFN, TL16C552AFNG4) maintain identical specifications and package type, enabling direct replacement. The recommended substitute (TL16C752DPFBR) offers enhanced performance (64-byte FIFO, 3 Mbps data rate, auto flow control, IrDA support) but requires package redesign from 68-PLCC to 48-TQFP, necessitating PCB layout modification.

Q: Why is TL16C752AFNG4 not recommended despite being a parametric equivalent?

A: TL16C752AFNG4 carries Obsolete product status with limited inventory (802 pcs). While electrically identical to TL16C552FN, its discontinued status and lower stock levels make it unsuitable for new production planning. TL16C552AFN is preferred due to Last Time Buy status and higher inventory availability (1716 pcs).

Q: Does the TL16C752DPFBR require firmware changes?

A: The TL16C752DPFBR maintains dual UART channel architecture, modem control, and false start bit detection, ensuring software compatibility at the functional level. However, the enhanced FIFO depth (64-byte vs. 16-byte) and additional features (auto flow control, IrDA encoder/decoder) may allow firmware optimization. PCB layout redesign is mandatory due to package change from 68-PLCC to 48-TQFP.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts (TL16C552AFN, TL16C552AFNG4, TL16C752DPFBR) maintain ROHS3 compliance and REACH Unaffected status, meeting regulatory requirements for new production and export.

Q: What is the moisture sensitivity difference between the main part and TL16C752DPFBR?

A: The TL16C552FN has MSL-3 rating (168 hours), while TL16C752DPFBR has MSL-2 rating (1 year). MSL-2 provides extended shelf life and reduced moisture absorption risk, improving handling flexibility in manufacturing environments.

Q: Can multiple TL16C552FN units be replaced with a single TL16C752DPFBR?

A: No. Both the main part and all substitutes provide exactly two UART channels. Channel count cannot be increased through substitution. Multiple devices would be required if additional channels are needed.