SN75ALS161DW IEEE 488 Half Transceiver Equivalent & Substitute Parts

Part Overview

The SN75ALS161DW is an 8/8 half-duplex transceiver designed for IEEE 488 bus interface applications. Manufactured by Texas Instruments in a 20-SOIC surface mount package, this component operates at 4.75V to 5.25V supply voltage with a 650 mV receiver hysteresis specification. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations where IEEE 488 protocol support is required.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN75ALS161DW
Manufacturer	Texas Instruments
Category	Interface
Type	Transceiver
Protocol	IEEE 488
Number of Drivers/Receivers	8/8
Duplex Mode	Half
Receiver Hysteresis	650 mV
Voltage Supply Range	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the SN75ALS161DW is determined by the following critical parameters:

Primary Equivalence Criteria:

Protocol: IEEE 488
Number of Drivers/Receivers: 8/8
Duplex Mode: Half
Package / Case: 20-SOIC (0.295", 7.50mm Width)
Receiver Hysteresis: 650 mV
Voltage Supply Range: 4.75V ~ 5.25V
Operating Temperature: 0°C ~ 70°C

Parts meeting all primary criteria are classified as parametric equivalents. Parts with different protocols, driver/receiver configurations, or package specifications are classified as functional alternatives with design considerations.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Duplex	Package	Voltage Supply	Operating Temp	Receiver Hysteresis	Product Status
SN75ALS161DW	Texas Instruments	IEEE 488	8/8	Half	20-SOIC	4.75V ~ 5.25V	0°C ~ 70°C	650 mV	Obsolete
SN75160BDW	Texas Instruments	IEEE 488	8/8	Half	20-SOIC	4.75V ~ 5.25V	0°C ~ 70°C	650 mV	Obsolete
SN75161BDW	Texas Instruments	IEEE 488	8/8	Half	20-SOIC	4.75V ~ 5.25V	0°C ~ 70°C	650 mV	Obsolete
SN75ALS160DW	Texas Instruments	IEEE 488	8/8	Half	20-SOIC	4.75V ~ 5.25V	0°C ~ 70°C	650 mV	Active
SN75ALS161DWE4	Texas Instruments	IEEE 488	8/8	Half	20-SOIC	4.75V ~ 5.25V	0°C ~ 70°C	650 mV	Discontinued at DiGi Electronics
SN65C1167ENSR	Texas Instruments	RS422, RS485	2/2	Full	16-SOIC	4.5V ~ 5.5V	-40°C ~ 85°C	60 mV	Active

Engineering Selection Recommendations

Parametric Equivalent Selection (Recommended for Direct Replacement):

SN75ALS160DW is the preferred substitute for SN75ALS161DW. Both parts share identical electrical and mechanical specifications including IEEE 488 protocol support, 8/8 driver/receiver configuration, half-duplex operation, 20-SOIC packaging, and matching voltage/temperature ranges. The SN75ALS160DW maintains active product status, ensuring long-term availability and supply chain stability. Both parts are ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

SN75160BDW and SN75161BDW are parametric equivalents meeting all primary criteria but carry obsolete product status, limiting their suitability for new designs despite technical compatibility.

SN75ALS161DWE4 is a variant of the main part with identical specifications but discontinued status at DiGi Electronics, making it unsuitable for procurement.

Functional Alternative (Protocol Change Required):

SN65C1167ENSR is a full-duplex RS422/RS485 transceiver with 2/2 driver/receiver configuration in a 16-SOIC package. This part operates at an extended voltage range (4.5V ~ 5.5V) and temperature range (-40°C ~ 85°C) with lower receiver hysteresis (60 mV). Selection of this alternative requires protocol conversion from IEEE 488 to RS422/RS485 and system redesign to accommodate different electrical characteristics and package footprint.

Frequently Asked Questions (FAQ)

Q: Can SN75ALS160DW directly replace SN75ALS161DW without PCB modifications?

A: Yes. SN75ALS160DW is a parametric equivalent with identical package, pinout, electrical specifications, and IEEE 488 protocol support. No PCB layout changes are required for direct substitution.

Q: Why is SN75ALS160DW preferred over SN75160BDW or SN75161BDW?

A: All three parts meet identical electrical and mechanical criteria. SN75ALS160DW is preferred because it maintains active product status, ensuring reliable long-term availability and supply chain support. The other two parts are classified as obsolete, presenting future procurement risks.

Q: Can SN65C1167ENSR be used as a drop-in replacement?

A: No. SN65C1167ENSR operates on RS422/RS485 protocols rather than IEEE 488, uses a different package (16-SOIC versus 20-SOIC), and has different electrical characteristics including receiver hysteresis (60 mV versus 650 mV) and operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C). System redesign and protocol conversion are required.

Q: What are the key parameters that determine substitution compatibility?

A: Protocol (IEEE 488), driver/receiver count (8/8), duplex mode (half), package type (20-SOIC), receiver hysteresis (650 mV), supply voltage range (4.75V ~ 5.25V), and operating temperature range (0°C ~ 70°C) are the critical parameters. Parts matching all these specifications are direct substitutes.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. SN75ALS160DW, SN75160BDW, SN75161BDW, SN75ALS161DWE4, and SN65C1167ENSR are all ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Q: What is the inventory status of available substitutes?

A: SN75ALS160DW has 2,100 units in stock. SN75160BDW has 1,468 units. SN75161BDW has 2,124 units. SN65C1167ENSR has 9,508 units. Inventory levels should be verified with your supplier for current availability.

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