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ST232BD RS232 Transceiver Equivalent & Substitute Parts
Part Overview
The ST232BD is a 2/2 full-duplex RS232 transceiver manufactured by STMicroelectronics in a 16-SOIC surface mount package. This interface IC operates across the 4.5V to 5.5V supply voltage range with a data rate of 220 Kbps and supports operating temperatures from -40°C to 85°C. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, production continuity, and system maintenance applications.
Substiute Parts
Key Parameters
| Parameter | ST232BD Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Part Number | ST232BD |
| Product Status | Obsolete |
| Type | Transceiver |
| Protocol | RS232 |
| Number of Drivers/Receivers | 2/2 |
| Duplex | Full |
| Receiver Hysteresis | 500 mV |
| Data Rate | 220 Kbps |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
| Package / Case | 16-SOIC (0.154", 3.90mm Width) |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| REACH Status | REACH Unaffected |
Substitute Part Grouping Explanation
Substitution of the ST232BD is determined by strict alignment across the following critical parameters:
Primary Substitution Criteria:
- Protocol: RS232
- Number of Drivers/Receivers: 2/2
- Duplex: Full
- Voltage - Supply: 4.5V ~ 5.5V
- Mounting Type: Surface Mount
- Package / Case: 16-SOIC (0.154", 3.90mm Width)
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level (MSL): 1 (Unlimited)
Secondary Compatibility Factors:
- Operating Temperature Range: -40°C ~ 85°C (preferred for extended industrial applications)
- Data Rate: Minimum 220 Kbps or higher
- Receiver Hysteresis: 500 mV (nominal reference)
Substitute parts are grouped into two categories based on operating temperature range and data rate specifications. Parts meeting all primary criteria with extended temperature range (-40°C to 85°C) and data rates at or above 220 Kbps are classified as direct functional equivalents. Parts with narrower temperature ranges (0°C to 70°C) or lower data rates (120 Kbps) are classified as compatible substitutes with application-dependent suitability.
Parameter Comparison
| Part Number | Manufacturer | Protocol | Drivers/Receivers | Data Rate | Supply Voltage | Operating Temperature | Package | RoHS Status | MSL | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|
| ST232BD | STMicroelectronics | RS232 | 2/2 | 220 Kbps | 4.5V ~ 5.5V | -40°C ~ 85°C | 16-SOIC (0.154", 3.90mm) | ROHS3 Compliant | 1 (Unlimited) | Obsolete |
| ADM232AARNZ | UMW | RS232 | 2/2 | 120 Kbps | 4.5V ~ 5.5V | -40°C ~ 85°C | 16-SOIC (0.154", 3.90mm) | ROHS3 Compliant | 1 (Unlimited) | Active |
| ADM232AARNZ-REEL | Analog Devices Inc. | RS232 | 2/2 | 200 Kbps | 4.5V ~ 5.5V | -40°C ~ 85°C | 16-SOIC (0.154", 3.90mm) | ROHS3 Compliant | 1 (Unlimited) | Active |
| ADM232AARNZ-REEL7 | Analog Devices Inc. | RS232 | 2/2 | 200 Kbps | 4.5V ~ 5.5V | -40°C ~ 85°C | 16-SOIC (0.154", 3.90mm) | ROHS3 Compliant | 1 (Unlimited) | Active |
| ADM232LARZ | Analog Devices Inc. | RS232 | 2/2 | 120 Kbps | 4.5V ~ 5.5V | -40°C ~ 85°C | 16-SOIC (0.295", 7.50mm) | ROHS3 Compliant | 1 (Unlimited) | Active |
| ADM232LARZ-REEL | Analog Devices Inc. | RS232 | 2/2 | 120 Kbps | 4.5V ~ 5.5V | -40°C ~ 85°C | 16-SOIC (0.295", 7.50mm) | ROHS3 Compliant | 1 (Unlimited) | Active |
| HIN202CBNZ | Renesas Electronics Corporation | RS232 | 2/2 | 120 Kbps | 4.5V ~ 5.5V | 0°C ~ 70°C | 16-SOIC (0.154", 3.90mm) | ROHS3 Compliant | 2 (1 Year) | Active |
| HIN202CBNZ-T | Renesas Electronics Corporation | RS232 | 2/2 | 120 Kbps | 4.5V ~ 5.5V | 0°C ~ 70°C | 16-SOIC (0.154", 3.90mm) | ROHS3 Compliant | 2 (1 Year) | Active |
| HIN202ECBNZ | Renesas Electronics Corporation | RS232 | 2/2 | 230 Kbps | 4.5V ~ 5.5V | 0°C ~ 70°C | 16-SOIC (0.154", 3.90mm) | ROHS3 Compliant | 2 (1 Year) | Active |
| HIN202ECBNZ-T | Renesas Electronics Corporation | RS232 | 2/2 | 230 Kbps | 4.5V ~ 5.5V | 0°C ~ 70°C | 16-SOIC (0.154", 3.90mm) | ROHS3 Compliant | 2 (1 Year) | Active |
| HIN202EIBNZ | Renesas Electronics Corporation | RS232 | 2/2 | 230 Kbps | 4.5V ~ 5.5V | -40°C ~ 85°C | 16-SOIC (0.154", 3.90mm) | ROHS3 Compliant | 2 (1 Year) | Active |
Engineering Selection Recommendations
Direct Functional Equivalents (Preferred for Extended Temperature Applications):
The ADM232AARNZ-REEL and ADM232AARNZ-REEL7 from Analog Devices Inc. provide the closest functional equivalence to the ST232BD. Both parts maintain the extended operating temperature range of -40°C to 85°C, support the 4.5V to 5.5V supply voltage, and are housed in the identical 16-SOIC (0.154", 3.90mm Width) package. Data rates of 200 Kbps meet the operational requirements for most RS232 applications. Both parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity, ensuring compatibility with standard manufacturing and storage protocols. Product status is active, providing long-term availability and supply chain stability.
The HIN202EIBNZ from Renesas Electronics Corporation offers equivalent performance with a data rate of 230 Kbps and maintains the -40°C to 85°C operating temperature range. This part is housed in the same 16-SOIC (0.154", 3.90mm Width) package and is ROHS3 compliant. The MSL rating of 2 (1 Year) requires controlled storage conditions compared to the ST232BD's MSL 1 rating. Active product status ensures availability.
Compatible Substitutes (Narrower Temperature Range):
The HIN202ECBNZ and HIN202ECBNZ-T from Renesas Electronics Corporation provide data rates of 230 Kbps with identical package geometry and ROHS3 compliance. These parts operate within the 0°C to 70°C temperature range, which is suitable for commercial and industrial applications that do not require extended low-temperature operation below 0°C or high-temperature operation above 70°C. MSL 2 (1 Year) moisture sensitivity requires controlled storage. Active product status ensures supply availability.
Lower Data Rate Alternatives:
The ADM232AARNZ from UMW, ADM232LARZ and ADM232LARZ-REEL from Analog Devices Inc., and HIN202CBNZ and HIN202CBNZ-T from Renesas Electronics Corporation operate at 120 Kbps. These parts are suitable for applications where lower data rates are acceptable. The ADM232 variants maintain the -40°C to 85°C temperature range and MSL 1 rating. The ADM232LARZ variants use a wider 16-SOIC package (0.295", 7.50mm Width), requiring PCB layout verification. The HIN202CBNZ variants operate within 0°C to 70°C and carry MSL 2 (1 Year) moisture sensitivity.
Frequently Asked Questions (FAQ)
Q: Can the ADM232AARNZ-REEL directly replace the ST232BD in existing designs?
A: The ADM232AARNZ-REEL is a direct functional substitute. Both parts share identical supply voltage (4.5V ~ 5.5V), operating temperature range (-40°C ~ 85°C), package geometry (16-SOIC 0.154" width), and compliance certifications (ROHS3, MSL 1). The data rate of 200 Kbps is within acceptable operational parameters for RS232 communication. No PCB modifications are required.
Q: What is the difference between ADM232AARNZ-REEL and ADM232AARNZ-REEL7?
A: Both parts are functionally identical with 200 Kbps data rates, -40°C to 85°C operating temperature, and identical packaging. The designation difference reflects packaging configuration and supplier reel specifications. Selection between these variants depends on procurement and inventory management requirements.
Q: Why do some substitute parts have a narrower operating temperature range?
A: The HIN202 series from Renesas Electronics Corporation offers variants with 0°C to 70°C operating ranges. These parts are suitable for applications that do not require extended temperature operation. Selection depends on the specific application's thermal environment. Extended temperature range parts (-40°C to 85°C) are required for industrial, automotive, and outdoor applications.
Q: What does MSL 2 (1 Year) mean compared to MSL 1 (Unlimited)?
A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be stored in standard conditions before requiring baking. MSL 1 (Unlimited) allows indefinite storage without baking. MSL 2 (1 Year) requires baking if the component has been stored for more than one year in standard humidity conditions. This affects inventory management and handling procedures.
Q: Are the ADM232LARZ and ADM232LARZ-REEL suitable replacements?
A: The ADM232LARZ variants maintain the -40°C to 85°C operating temperature and MSL 1 rating. However, the package width is 0.295" (7.50mm) compared to the ST232BD's 0.154" (3.90mm). This wider package requires verification of PCB layout compatibility. Data rate is 120 Kbps, which is lower than the ST232BD's 220 Kbps. These parts are suitable only if PCB layout accommodates the wider package and application data rates do not exceed 120 Kbps.
Q: Which substitute part offers the highest data rate?
A: The HIN202ECBNZ, HIN202ECBNZ-T, and HIN202EIBNZ from Renesas Electronics Corporation all support 230 Kbps data rates, exceeding the ST232BD's 220 Kbps specification. The HIN202EIBNZ maintains the extended -40°C to 85°C operating temperature range, while the HIN202ECBNZ and HIN202ECBNZ-T operate within 0°C to 70°C.
Q: Is ROHS3 compliance maintained across all substitute parts?
A: All listed substitute parts are ROHS3 compliant, matching the ST232BD's environmental compliance status. This ensures compatibility with modern manufacturing standards and regulatory requirements.
Q: What packaging options are available for the substitute parts?
A: Substitute parts are available in Cut Tape (CT) & Digi-Reel® and Tube packaging formats. The ADM232AARNZ-REEL, ADM232AARNZ-REEL7, ADM232LARZ-REEL, HIN202CBNZ-T, and HIN202ECBNZ-T are supplied in Cut Tape & Digi-Reel® format. The ADM232AARNZ, ADM232LARZ, HIN202CBNZ, HIN202ECBNZ, and HIN202EIBNZ are supplied in Tube format. Selection depends on production volume and assembly process requirements.
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