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SN75LBC182D RS422/RS485 Half Duplex Transceiver Equivalent & Substitute Parts
Part Overview
The SN75LBC182D is a half-duplex RS422/RS485 transceiver manufactured by Texas Instruments in 8-SOIC surface mount packaging. This interface IC operates at 250 kbps data rate with 70 mV receiver hysteresis and is designed for industrial communication applications requiring robust noise immunity. The part is currently in Last Time Buy status, making equivalent and substitute parts essential for ongoing design support and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | SN75LBC182D |
| Manufacturer | Texas Instruments |
| Protocol Support | RS422, RS485 |
| Drivers/Receivers Configuration | 1/1 |
| Duplex Mode | Half |
| Data Rate | 250 kbps |
| Receiver Hysteresis | 70 mV |
| Supply Voltage Range | 4.75V ~ 5.25V |
| Operating Temperature | 0°C ~ 70°C |
| Package Type | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Product Status | Last Time Buy |
Substitute Part Grouping Explanation
Substitution for the SN75LBC182D is determined by strict parameter matching across the following critical criteria:
Primary Substitution Parameters:
- Protocol Support: RS422 and RS485 compatibility required
- Configuration: 1 driver and 1 receiver (1/1) mandatory
- Duplex Mode: Half-duplex operation required
- Package: 8-SOIC surface mount form factor
- Supply Voltage: 4.75V ~ 5.25V operating range
- Data Rate: 250 kbps minimum capability
- Receiver Hysteresis: 70 mV nominal (±25 mV tolerance acceptable)
Substitute Categories:
MFR Recommended Direct Substitutes maintain identical electrical specifications and packaging, differing only in product status or packaging format (tube vs. tape & reel):
- SN75LBC182DR (Texas Instruments, Active status, tape & reel packaging)
Parametric Equivalents share core electrical parameters but may originate from different manufacturers or have minor specification variations:
- SN75LBC184D (Texas Instruments, Last Time Buy status)
- ADM487EARZ (Analog Devices, Active status, extended temperature range)
- ADM487EARZ-REEL7 (Analog Devices, Active status, tape & reel format)
- LTC1481CS8#PBF (Analog Devices, Active status, higher data rate capability)
- LTC1481CS8#TRPBF (Analog Devices, Active status, tape & reel format)
Upgrade Options provide enhanced performance characteristics while maintaining functional compatibility:
- MAX3442EASA+ (Analog Devices/Maxim, reduced hysteresis 25 mV, extended temperature -40°C ~ 125°C)
- MAX3442EASA+T (Analog Devices/Maxim, tape & reel format, extended temperature)
- MAX3442EESA+ (Analog Devices/Maxim, reduced hysteresis 25 mV, extended temperature -40°C ~ 85°C)
- MAX3442EESA+T (Analog Devices/Maxim, tape & reel format, extended temperature)
Parameter Comparison
| Part Number | Manufacturer | Protocol | Config | Duplex | Data Rate | Hysteresis | Supply Voltage | Temp Range | Package | Status |
|---|---|---|---|---|---|---|---|---|---|---|
| SN75LBC182D | Texas Instruments | RS422, RS485 | 1/1 | Half | 250 kbps | 70 mV | 4.75V ~ 5.25V | 0°C ~ 70°C | 8-SOIC | Last Time Buy |
| SN75LBC182DR | Texas Instruments | RS422, RS485 | 1/1 | Half | 250 kbps | 70 mV | 4.75V ~ 5.25V | 0°C ~ 70°C | 8-SOIC | Active |
| SN75LBC184D | Texas Instruments | RS422, RS485 | 1/1 | Half | 250 kbps | 70 mV | 4.75V ~ 5.25V | 0°C ~ 70°C | 8-SOIC | Last Time Buy |
| ADM487EARZ | Analog Devices | RS422, RS485 | 1/1 | Half | 250 kbps | 70 mV | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active |
| ADM487EARZ-REEL7 | Analog Devices | RS422, RS485 | 1/1 | Half | 250 kbps | 70 mV | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active |
| LTC1481CS8#PBF | Analog Devices | RS422, RS485 | 1/1 | Half | 2.5 Mbps | 45 mV | 4.75V ~ 5.25V | 0°C ~ 70°C | 8-SOIC | Active |
| LTC1481CS8#TRPBF | Analog Devices | RS422, RS485 | 1/1 | Half | 2.5 Mbps | 45 mV | 4.75V ~ 5.25V | 0°C ~ 70°C | 8-SOIC | Active |
| MAX3442EASA+ | Analog Devices/Maxim | RS422, RS485 | 1/1 | Half | 250 kbps | 25 mV | 4.75V ~ 5.25V | -40°C ~ 125°C | 8-SOIC | Active |
| MAX3442EASA+T | Analog Devices/Maxim | RS422, RS485 | 1/1 | Half | 250 kbps | 25 mV | 4.75V ~ 5.25V | -40°C ~ 125°C | 8-SOIC | Active |
| MAX3442EESA+ | Analog Devices/Maxim | RS422, RS485 | 1/1 | Half | 250 kbps | 25 mV | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active |
| MAX3442EESA+T | Analog Devices/Maxim | RS422, RS485 | 1/1 | Half | 250 kbps | 25 mV | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active |
Engineering Selection Recommendations
For Direct Replacement (Identical Specifications): SN75LBC182DR is the primary recommendation as the Active-status equivalent of the Last Time Buy SN75LBC182D. Both parts maintain identical electrical and thermal specifications with only packaging format differences (tube vs. tape & reel). This substitution requires no circuit redesign.
For Extended Temperature Range Applications: ADM487EARZ and ADM487EARZ-REEL7 provide identical electrical performance to the original part while extending the operating temperature range to -40°C ~ 85°C. These Analog Devices parts are in Active production status and offer superior long-term availability. Selection between tube (ADM487EARZ) and tape & reel (ADM487EARZ-REEL7) depends on procurement and assembly requirements.
For Enhanced Noise Immunity: MAX3442EASA+, MAX3442EASA+T, MAX3442EESA+, and MAX3442EESA+T offer reduced receiver hysteresis (25 mV vs. 70 mV), providing improved noise discrimination in electrically noisy environments. These parts maintain 250 kbps data rate and 4.75V ~ 5.25V supply compatibility. Temperature range selection depends on application requirements: MAX3442EASA variants support -40°C ~ 125°C, while MAX3442EESA variants support -40°C ~ 85°C. Packaging format selection (tube vs. tape & reel) follows procurement methodology.
For Higher Data Rate Capability: LTC1481CS8#PBF and LTC1481CS8#TRPBF support 2.5 Mbps data rate with 45 mV receiver hysteresis, providing performance headroom for future bandwidth requirements while maintaining backward compatibility with 250 kbps legacy systems. These parts operate within the same supply voltage and temperature range as the original SN75LBC182D.
All recommended substitutes maintain ROHS3 compliance and identical 8-SOIC surface mount packaging, ensuring PCB layout compatibility without redesign.
Frequently Asked Questions (FAQ)
Q: Can SN75LBC182DR directly replace SN75LBC182D without circuit modification?
A: Yes. SN75LBC182DR is electrically and functionally identical to SN75LBC182D. The only difference is packaging format (tape & reel vs. tube) and Active product status. No circuit changes are required.
Q: What is the difference between ADM487EARZ and the original SN75LBC182D?
A: ADM487EARZ maintains identical electrical specifications (70 mV hysteresis, 250 kbps data rate, 1/1 configuration, half-duplex RS422/RS485) but extends the operating temperature range from 0°C ~ 70°C to -40°C ~ 85°C. It is in Active production status, ensuring long-term availability.
Q: Why would I choose MAX3442EASA+ over ADM487EARZ?
A: MAX3442EASA+ provides reduced receiver hysteresis (25 mV vs. 70 mV), which improves noise discrimination in electrically noisy environments. It also supports an extended temperature range of -40°C ~ 125°C. Select this part if your application requires enhanced noise immunity or operates at extreme temperatures.
Q: Are LTC1481CS8#PBF and LTC1481CS8#TRPBF backward compatible with SN75LBC182D?
A: Yes. Both LTC1481 variants support RS422/RS485 protocols with 1/1 driver/receiver configuration and half-duplex operation. They operate within the same 4.75V ~ 5.25V supply range and 0°C ~ 70°C temperature range. The primary difference is higher data rate capability (2.5 Mbps vs. 250 kbps) and lower receiver hysteresis (45 mV vs. 70 mV), making them suitable for higher-speed applications while remaining compatible with legacy 250 kbps systems.
Q: What does "Last Time Buy" status mean for SN75LBC182D?
A: Last Time Buy indicates the manufacturer will no longer produce this part after a specified date. Existing inventory may be available, but long-term supply is not guaranteed. Substitution to Active-status parts (such as SN75LBC182DR, ADM487EARZ, or MAX3442 variants) is recommended for new designs and ongoing production.
Q: Do all substitute parts use the same 8-SOIC package?
A: Yes. All listed substitute parts use 8-SOIC (0.154", 3.90mm Width) surface mount packaging, ensuring PCB footprint compatibility without layout redesign.
Q: What is the difference between tube and tape & reel packaging?
A: Tube packaging contains loose components in a plastic tube, suitable for small-quantity orders and manual assembly. Tape & reel packaging places components on a continuous tape wound on a reel, optimized for high-volume automated assembly. Both formats contain identical components; selection depends on production volume and assembly methodology.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed substitute parts maintain ROHS3 compliance, meeting environmental and regulatory requirements for industrial and commercial applications.
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