SN75C3222DBR RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The SN75C3222DBR is a 2/2 full-duplex RS232 transceiver manufactured by Texas Instruments in a 20-SSOP surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device operates across a 3V to 5.5V supply range with a 1Mbps data rate capability and is ROHS3 compliant with unlimited moisture sensitivity rating.

Substiute Parts

SN75C3222DBR

Texas InstrumentsIn Stock: 878SN75C3222DBR Datasheet

Current PartRFQ

MAX3222ECAP+

Analog Devices Inc./Maxim IntegratedIn Stock: 2079MAX3222ECAP+ Datasheet

DirectRFQ

MAX3222ECAP+T

Analog Devices Inc./Maxim IntegratedIn Stock: 2908MAX3222ECAP+T Datasheet

DirectRFQ

ST3222ECPR

STMicroelectronicsIn Stock: 1441ST3222ECPR Datasheet

DirectRFQ

ICL3222ECAZ

Renesas Electronics CorporationIn Stock: 1705ICL3222ECAZ Datasheet

MFR RecommendedRFQ

ICL3222ECAZ-T

Renesas Electronics CorporationIn Stock: 3128ICL3222ECAZ-T Datasheet

MFR RecommendedRFQ

SP3222EBEA-L/TR

MaxLinear, Inc.In Stock: 3786SP3222EBEA-L/TR Datasheet

MFR RecommendedRFQ

SP3222ECA-L/TR

MaxLinear, Inc.In Stock: 22341SP3222ECA-L/TR Datasheet

MFR RecommendedRFQ

SP3222EEA-L/TR

MaxLinear, Inc.In Stock: 22464SP3222EEA-L/TR Datasheet

MFR RecommendedRFQ

ST3222BTR

STMicroelectronicsIn Stock: 18407ST3222BTR Datasheet

MFR RecommendedRFQ

ST3222CTR

STMicroelectronicsIn Stock: 15796ST3222CTR Datasheet

MFR RecommendedRFQ

ST3222EBPR

STMicroelectronicsIn Stock: 17179ST3222EBPR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN75C3222DBR is determined by the following critical parameters:

Primary Compatibility Criteria:

• Protocol: RS232
• Configuration: 2/2 Drivers/Receivers, Full Duplex
• Package Type: 20-SSOP (0.209", 5.30mm Width)
• Voltage Supply Range: 3V ~ 5.5V
• Mounting Type: Surface Mount

Secondary Compatibility Criteria:

• Data Rate: Minimum 1Mbps (SN75C3222DBR specification)
• Receiver Hysteresis: 300 mV or 500 mV acceptable
• Operating Temperature: 0°C ~ 70°C minimum coverage
• RoHS Compliance: ROHS3 or equivalent

Substitute parts are grouped into two categories based on package compatibility:

Group 1: 20-SSOP Package (Direct Pin-Compatible)

• MAX3222ECAP+ (Tube packaging)
• MAX3222ECAP+T (Tape & Reel packaging)
• ST3222ECPR (Tape & Reel packaging)
• ICL3222ECAZ (Tube packaging)
• ICL3222ECAZ-T (Tape & Reel packaging)
• SP3222EBEA-L/TR (Tape & Reel packaging)
• SP3222ECA-L/TR (Tape & Reel packaging)
• SP3222EEA-L/TR (Tape & Reel packaging)

Group 2: 20-TSSOP Package (Different Package Footprint)

• ST3222BTR (Cut Tape & Digi-Reel packaging)
• ST3222CTR (Tape & Reel packaging)

Group 2 parts require PCB layout modification due to different package dimensions (0.173", 4.40mm Width vs. 0.209", 5.30mm Width).

Parameter Comparison

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement (20-SSOP Package):

MAX3222ECAP+ and MAX3222ECAP+T are the primary substitutes. Both are active products from Analog Devices Inc./Maxim Integrated with ROHS3 compliance. The MAX3222 series maintains full electrical compatibility with the SN75C3222DBR across all critical parameters: 2/2 configuration, full duplex RS232, 3V to 5.5V supply, and 1Mbps data rate capability. The 500 mV receiver hysteresis (versus 300 mV on the original) provides enhanced noise immunity. Packaging options include Tube (MAX3222ECAP+) and Tape & Reel (MAX3222ECAP+T) for production flexibility.

ST3222ECPR, ICL3222ECAZ, and ICL3222ECAZ-T are alternative 20-SSOP options with active product status and ROHS3 compliance. These parts operate at 250kbps data rate, which is lower than the SN75C3222DBR specification but remains suitable for most RS232 applications. ICL3222 variants are available in both Tube and Tape & Reel packaging.

SP3222 series parts (SP3222EBEA-L/TR, SP3222ECA-L/TR, SP3222EEA-L/TR) from MaxLinear maintain the 20-SSOP package and 300 mV receiver hysteresis matching the original part. These are active products with RoHS compliance. Operating temperature ranges extend to -40°C to 85°C on select variants, providing broader environmental coverage than the original 0°C to 70°C specification.

For Package-Modified Replacement (20-TSSOP Package):

ST3222BTR and ST3222CTR require PCB layout modification due to different package footprint (20-TSSOP vs. 20-SSOP). ST3222CTR maintains full voltage supply compatibility (3V to 5.5V) and operating temperature range (0°C to 70°C) matching the original specification. ST3222BTR operates at reduced voltage supply (3V to 3.6V) and extended temperature range (-40°C to 85°C), requiring design verification for supply voltage compatibility.

Compliance and Availability:

All substitute parts maintain ROHS3 or equivalent RoHS compliance. Inventory availability is confirmed across all listed alternatives, with SP3222ECA-L/TR and SP3222EEA-L/TR showing highest stock levels (22,300 and 22,400 units respectively).

Frequently Asked Questions (FAQ)

Q: Can MAX3222ECAP+ directly replace SN75C3222DBR without PCB modification?

A: Yes. Both parts use the 20-SSOP package with identical pin assignments and electrical interface. No PCB layout changes are required. The MAX3222ECAP+ is pin-compatible and functionally equivalent for RS232 transceiver applications.

Q: What is the difference between MAX3222ECAP+ and MAX3222ECAP+T?

A: Both parts are electrically identical. The difference is packaging format: MAX3222ECAP+ is supplied in Tube packaging, while MAX3222ECAP+T is supplied in Tape & Reel format. Selection depends on production volume and assembly equipment compatibility.

Q: Why do some substitute parts have lower data rates (250kbps vs. 1Mbps)?

A: The SN75C3222DBR specification includes 1Mbps capability. Substitute parts like ST3222ECPR and ICL3222ECAZ are rated at 250kbps. This lower specification remains compatible with most RS232 applications, which typically operate at 9600 to 115200 baud rates. Design verification is required if the application requires data rates above 250kbps.

Q: Can ST3222BTR or ST3222CTR be used as direct replacements?

A: These parts require PCB layout modification. ST3222BTR and ST3222CTR use the 20-TSSOP package (0.173", 4.40mm Width) instead of the 20-SSOP package (0.209", 5.30mm Width) of the original part. Pin spacing and footprint differ, requiring PCB redesign. Electrical functionality remains compatible.

Q: What is the significance of receiver hysteresis differences (300 mV vs. 500 mV)?

A: Receiver hysteresis affects noise immunity during signal transitions. The original SN75C3222DBR specifies 300 mV hysteresis. Substitute parts with 500 mV hysteresis (MAX3222, ST3222, ICL3222 series) provide enhanced noise rejection in electrically noisy environments. This is a beneficial characteristic and does not create compatibility issues.

Q: Are all substitute parts ROHS3 compliant?

A: Most substitute parts are ROHS3 compliant. SP3222 series parts from MaxLinear carry RoHS compliance designation. All listed parts meet environmental compliance requirements for current production standards.

Q: Which substitute offers the widest operating temperature range?

A: SP3222EBEA-L/TR and SP3222EEA-L/TR, along with ST3222BTR, operate across -40°C to 85°C. The original SN75C3222DBR operates at 0°C to 70°C. Extended temperature variants are suitable for industrial and automotive applications requiring broader thermal operating ranges.

Q: What is the MSL (Moisture Sensitivity Level) impact when selecting substitutes?

A: The original SN75C3222DBR has MSL 1 (Unlimited). Most substitutes have MSL 1 or MSL 3 (168 Hours). MSL 3 parts require controlled storage and handling procedures to prevent moisture absorption. For high-reliability applications, MSL 1 parts (MAX3222 series, ST3222ECPR) are preferred.