SN75C188D RS232 Driver IC Equivalent & Substitute Parts

Part Overview

The SN75C188D is a 4/0 RS232 driver interface IC manufactured by Texas Instruments in a 14-SOIC surface mount package. This component is classified as Last Time Buy, indicating discontinued production status. The part operates across a supply voltage range of ±4.5V to 15V and supports operating temperatures from 0°C to 70°C. Identification of equivalent and substitute parts is necessary due to the Last Time Buy status, which restricts future availability and requires transition planning to active alternatives.

Key Parameters

Parameter	Value
Part Number	SN75C188D
Manufacturer	Texas Instruments
Category	Interface
Type	Driver
Protocol	RS232
Number of Drivers/Receivers	4/0
Voltage - Supply	±4.5V ~ 15V
Operating Temperature	0°C ~ 70°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution eligibility for the SN75C188D is determined by the following critical parameters:

Primary Compatibility Criteria:

RS232 protocol implementation
4/0 driver/receiver configuration
14-SOIC package form factor
Surface mount mounting type
ROHS3 compliance

Secondary Compatibility Criteria:

Supply voltage range overlap with ±4.5V ~ 15V
Operating temperature range compatibility with 0°C ~ 70°C minimum
Electrical performance at specified data rates

All substitute parts listed maintain the core functional specification (4/0 RS232 driver in 14-SOIC package) and comply with ROHS3 requirements. Substitutes are grouped by manufacturer and product status to facilitate selection based on availability and supply chain requirements.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Supply	Operating Temperature	Data Rate	Package	Inventory
SN75C188D	Texas Instruments	Last Time Buy	±4.5V ~ 15V	0°C ~ 70°C	-	14-SOIC	1479 Pcs
SN75188DR	Texas Instruments	Active	±7.5V ~ 15V	0°C ~ 70°C	-	14-SOIC	18188 Pcs
DS14C88MX/NOPB	National Semiconductor	Active	4.5V ~ 12.6V	0°C ~ 70°C	-	14-SOIC	23672 Pcs
MAX1488ECSD+	Analog Devices Inc./Maxim Integrated	Active	4.5V ~ 13.2V	0°C ~ 70°C	120Kbps	14-SOIC	2200 Pcs
MAX1488ECSD+T	Analog Devices Inc./Maxim Integrated	Active	4.5V ~ 13.2V	0°C ~ 70°C	120Kbps	14-SOIC	3900 Pcs
MAX1488EESD+	Analog Devices Inc./Maxim Integrated	Active	4.5V ~ 13.2V	-40°C ~ 85°C	120Kbps	14-SOIC	3344 Pcs
MAX1488EESD+T	Analog Devices Inc./Maxim Integrated	Active	4.5V ~ 13.2V	-40°C ~ 85°C	120Kbps	14-SOIC	1134 Pcs

Engineering Selection Recommendations

Texas Instruments SN75188DR is the primary recommended substitute. This part maintains Texas Instruments manufacturing continuity, holds Active product status with substantial inventory availability (18188 pcs), and operates within compatible voltage and temperature ranges for standard industrial applications.

National Semiconductor DS14C88MX/NOPB provides an alternative from a different manufacturer with the highest inventory level (23672 pcs) and Active status. The supply voltage range (4.5V ~ 12.6V) is compatible with the original specification when operating within this narrower window.

Analog Devices Inc./Maxim Integrated MAX1488 series (ECSD+ and EESD+ variants) offers Active status with specified data rate performance (120Kbps). The EESD+ variants extend operating temperature range to -40°C ~ 85°C, suitable for applications requiring enhanced thermal performance. Packaging variants (tube vs. tape & reel) accommodate different procurement and assembly requirements.

All substitute parts maintain ROHS3 compliance and identical package geometry, ensuring direct mechanical and electrical compatibility within the specified parameter ranges.

Frequently Asked Questions (FAQ)

Q: Can SN75C188D be directly replaced with SN75188DR? A: Yes. Both parts are Texas Instruments RS232 4/0 drivers in 14-SOIC packages with compatible operating temperature ranges (0°C ~ 70°C). The SN75188DR supply voltage range (±7.5V ~ 15V) overlaps with the original specification and is suitable for applications operating within this range.

Q: What is the difference between MAX1488ECSD+ and MAX1488EESD+? A: Both are Analog Devices MAX1488 RS232 drivers with identical electrical specifications and 120Kbps data rate. The primary difference is operating temperature range: ECSD+ operates 0°C ~ 70°C, while EESD+ operates -40°C ~ 85°C. Select EESD+ for applications requiring extended temperature performance.

Q: Are packaging variants (tube vs. tape & reel) electrically equivalent? A: Yes. MAX1488ECSD+ (tube) and MAX1488ECSD+T (tape & reel) are electrically identical. The suffix "T" indicates tape & reel packaging for automated assembly. Selection depends on procurement method and assembly process requirements.

Q: Does DS14C88MX/NOPB have a narrower voltage range than the original? A: Yes. DS14C88MX/NOPB operates at 4.5V ~ 12.6V, which is narrower than the original SN75C188D specification (±4.5V ~ 15V). Verify your application's supply voltage falls within this range before selection.

Q: Which substitute has the best inventory availability? A: DS14C88MX/NOPB has the highest inventory level at 23672 pcs. SN75188DR follows with 18188 pcs. Both are suitable for immediate procurement.

Q: Are all substitutes ROHS3 compliant? A: All listed substitutes maintain ROHS3 compliance, consistent with the original SN75C188D specification.

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