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ST232ACD Equivalent & Substitute Parts
Part Overview
The ST232ACD is a 2/2 full-duplex RS232 transceiver interface IC manufactured by STMicroelectronics in a 16-SOIC surface mount package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and production requirements. The ST232ACD operates within a 4.5V to 5.5V supply voltage range and supports data rates up to 400 kbps with a receiver hysteresis of 500 mV across an operating temperature range of 0°C to 70°C.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | ST232ACD |
| Manufacturer | STMicroelectronics |
| Category | Interface |
| Type | Transceiver |
| Protocol | RS232 |
| Number of Drivers/Receivers | 2/2 |
| Duplex | Full |
| Data Rate | 400 kbps |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | 0°C ~ 70°C |
| Receiver Hysteresis | 500 mV |
| Mounting Type | Surface Mount |
| Package / Case | 16-SOIC (0.154", 3.90mm Width) |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the ST232ACD is determined by strict equivalence 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)
Secondary Compatibility Factors:
- Receiver Hysteresis: 500 mV (preferred match)
- Data Rate: 400 kbps (preferred match)
- Operating Temperature: 0°C ~ 70°C (preferred match)
- RoHS Status: ROHS3 Compliant
Substitute parts are classified into two categories:
Direct Substitutes: Parts that maintain identical electrical specifications and package dimensions, differing only in product status or packaging format.
Compatible Substitutes: Parts that meet all primary substitution criteria and maintain the same supply voltage and package footprint, with variations in secondary parameters such as data rate, operating temperature range, or receiver hysteresis that remain within acceptable operational boundaries for RS232 interface applications.
Parameter Comparison
| Part Number | Manufacturer | Protocol | Drivers/Receivers | Data Rate | Supply Voltage | Operating Temp | Receiver Hysteresis | Package | Product Status | Packaging Type |
|---|---|---|---|---|---|---|---|---|---|---|
| ST232ACD | STMicroelectronics | RS232 | 2/2 | 400 kbps | 4.5V ~ 5.5V | 0°C ~ 70°C | 500 mV | 16-SOIC (0.154", 3.90mm) | Obsolete | Tube |
| ST232ACDR | STMicroelectronics | RS232 | 2/2 | 400 kbps | 4.5V ~ 5.5V | 0°C ~ 70°C | 500 mV | 16-SOIC (0.154", 3.90mm) | Active | Tape & Reel |
| ADM232AARNZ | UMW | RS232 | 2/2 | 120 kbps | 4.5V ~ 5.5V | -40°C ~ 85°C | Not specified | 16-SOIC (0.154", 3.90mm) | Active | Cut Tape & Digi-Reel |
| ADM232AARNZ-REEL | Analog Devices Inc. | RS232 | 2/2 | 200 kbps | 4.5V ~ 5.5V | -40°C ~ 85°C | 400 mV | 16-SOIC (0.154", 3.90mm) | Active | Cut Tape & Digi-Reel |
| ADM232AARNZ-REEL7 | Analog Devices Inc. | RS232 | 2/2 | 200 kbps | 4.5V ~ 5.5V | -40°C ~ 85°C | 400 mV | 16-SOIC (0.154", 3.90mm) | Active | Cut Tape & Digi-Reel |
| ADM232LARZ | Analog Devices Inc. | RS232 | 2/2 | 120 kbps | 4.5V ~ 5.5V | -40°C ~ 85°C | 650 mV | 16-SOIC (0.295", 7.50mm) | Active | Tube |
| ADM232LARZ-REEL | Analog Devices Inc. | RS232 | 2/2 | 120 kbps | 4.5V ~ 5.5V | -40°C ~ 85°C | 650 mV | 16-SOIC (0.295", 7.50mm) | Active | Cut Tape & Digi-Reel |
| HIN202CBNZ | Renesas Electronics Corporation | RS232 | 2/2 | 120 kbps | 4.5V ~ 5.5V | 0°C ~ 70°C | 500 mV | 16-SOIC (0.154", 3.90mm) | Active | Tube |
| HIN202CBNZ-T | Renesas Electronics Corporation | RS232 | 2/2 | 120 kbps | 4.5V ~ 5.5V | 0°C ~ 70°C | 500 mV | 16-SOIC (0.154", 3.90mm) | Active | Cut Tape & Digi-Reel |
| HIN202ECBNZ | Renesas Electronics Corporation | RS232 | 2/2 | 230 kbps | 4.5V ~ 5.5V | 0°C ~ 70°C | 500 mV | 16-SOIC (0.154", 3.90mm) | Active | Tube |
| HIN202ECBNZ-T | Renesas Electronics Corporation | RS232 | 2/2 | 230 kbps | 4.5V ~ 5.5V | 0°C ~ 70°C | 500 mV | 16-SOIC (0.154", 3.90mm) | Active | Cut Tape & Digi-Reel |
Engineering Selection Recommendations
Direct Replacement (Highest Compatibility):
ST232ACDR is the primary direct replacement for ST232ACD. Both parts are manufactured by STMicroelectronics and maintain identical electrical specifications including 400 kbps data rate, 500 mV receiver hysteresis, and 0°C to 70°C operating temperature range. The ST232ACDR is currently in active production status, whereas the ST232ACD is obsolete. The only difference is packaging format: ST232ACDR is supplied in Tape & Reel format versus the tube packaging of the original part. Both are ROHS3 compliant and carry identical REACH and ECCN classifications.
Compatible Substitutes (Functional Equivalence):
The Renesas Electronics HIN202 series (HIN202CBNZ, HIN202CBNZ-T, HIN202ECBNZ, HIN202ECBNZ-T) provides functional equivalence with the ST232ACD. These parts maintain the same 2/2 full-duplex RS232 protocol, 4.5V to 5.5V supply voltage, 0°C to 70°C operating temperature range, 500 mV receiver hysteresis, and 16-SOIC (0.154", 3.90mm) package footprint. Data rate variations (120 kbps for HIN202CBNZ variants and 230 kbps for HIN202ECBNZ variants) remain within acceptable operational boundaries for RS232 applications. All variants are ROHS3 compliant and carry identical regulatory classifications.
Extended Temperature Range Alternatives:
The Analog Devices ADM232 series (ADM232AARNZ-REEL, ADM232AARNZ-REEL7, ADM232LARZ, ADM232LARZ-REEL) offers extended operating temperature range (-40°C to 85°C) compared to the ST232ACD. These parts maintain 4.5V to 5.5V supply voltage and 2/2 full-duplex RS232 protocol. The ADM232AARNZ variants support 200 kbps data rate with 400 mV receiver hysteresis in the standard 16-SOIC (0.154", 3.90mm) package. The ADM232LARZ variants operate at 120 kbps with 650 mV receiver hysteresis in a wider 16-SOIC (0.295", 7.50mm) package. These alternatives are suitable for applications requiring extended temperature operation but require PCB layout verification for the ADM232LARZ package width difference.
All substitute parts listed carry ROHS3 compliance and REACH unaffected status, maintaining regulatory equivalence with the original ST232ACD.
Frequently Asked Questions (FAQ)
Q: Can ST232ACDR be used as a direct replacement for ST232ACD?
A: Yes. ST232ACDR is the direct active production equivalent of ST232ACD. Both parts share identical electrical specifications (400 kbps data rate, 500 mV receiver hysteresis, 0°C to 70°C operating temperature, 4.5V to 5.5V supply voltage) and the same 16-SOIC (0.154", 3.90mm) package footprint. The only difference is packaging format: ST232ACDR is supplied in Tape & Reel format. No circuit modifications are required.
Q: What is the difference between the HIN202CBNZ and HIN202ECBNZ variants?
A: Both variants are manufactured by Renesas Electronics and maintain identical package, supply voltage, operating temperature range, and receiver hysteresis specifications. The primary difference is data rate: HIN202CBNZ supports 120 kbps while HIN202ECBNZ supports 230 kbps. Both are compatible with the ST232ACD operating envelope. Selection depends on application data rate requirements.
Q: Are the ADM232LARZ variants pin-compatible with ST232ACD?
A: The ADM232LARZ variants are functionally equivalent but have a different package width: 0.295" (7.50mm) compared to the ST232ACD's 0.154" (3.90mm). While both are 16-SOIC packages, the wider package requires PCB layout verification to confirm footprint compatibility. Pin count and signal assignments remain consistent with RS232 transceiver standards.
Q: Can I use HIN202CBNZ in place of ST232ACD if my application only requires 120 kbps data rate?
A: Yes. The HIN202CBNZ meets all primary substitution criteria: RS232 protocol, 2/2 full-duplex configuration, 4.5V to 5.5V supply voltage, 0°C to 70°C operating temperature range, 500 mV receiver hysteresis, and identical 16-SOIC (0.154", 3.90mm) package footprint. The 120 kbps data rate is lower than the ST232ACD's 400 kbps capability but is sufficient for applications with lower bandwidth requirements. No circuit modifications are required.
Q: What is the significance of the MSL (Moisture Sensitivity Level) difference between ST232ACD and substitute parts?
A: ST232ACD carries MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Some substitute parts carry MSL 2 or MSL 3 ratings, which impose storage and handling time limits. MSL 2 allows 1 year of storage under controlled conditions, while MSL 3 allows 168 hours. For applications with extended storage or in high-humidity environments, MSL 1 rated parts (ST232ACDR, ADM232AARNZ, ADM232LARZ variants, HIN202 series) are preferred to eliminate moisture-related reliability concerns.
Q: Are all listed substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed carry ROHS3 compliance status, maintaining regulatory equivalence with the ST232ACD. All parts are also REACH unaffected, ensuring compliance with European chemical regulations.
Q: What packaging options are available for the substitute parts?
A: Substitute parts are available in multiple packaging formats: Tube, Tape & Reel (TR), and Cut Tape (CT) & Digi-Reel. ST232ACDR is available in Tape & Reel format. Renesas HIN202 variants are available in both Tube and Cut Tape & Digi-Reel formats. Analog Devices ADM232 variants are available in Tube and Cut Tape & Digi-Reel formats. Selection depends on production volume and assembly process requirements.
Q: Can ADM232AARNZ be used in applications requiring the full 400 kbps data rate of ST232ACD?
A: No. ADM232AARNZ supports only 120 kbps data rate, which is insufficient for applications requiring the ST232ACD's 400 kbps capability. For full data rate compatibility, use ST232ACDR, HIN202ECBNZ (230 kbps), or ADM232AARNZ-REEL (200 kbps). The choice depends on whether the application can operate at the reduced data rates offered by these alternatives.
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