AM26LS31CN-NG Equivalent & Substitute Parts

Part Overview

The AM26LS31CN-NG is a 4/0 Driver RS422/RS485 interface IC manufactured by Texas Instruments in a 16-DIP through-hole package. This component functions as a line driver for serial communication protocols, specifically designed for RS422 and RS485 applications requiring four independent drivers and no receivers.

The AM26LS31CN-NG is classified as an obsolete product. Locating equivalent substitute parts is necessary due to discontinued manufacturing status and limited remaining inventory (908 pieces). Active alternative components with identical or compatible electrical and mechanical specifications are available to ensure design continuity and long-term supply chain reliability.

Substiute Parts

AM26LS31CN-NG

Texas InstrumentsIn Stock: 924AM26LS31CN-NG Datasheet

Current PartRFQ

AM26LS31CDR

Texas InstrumentsIn Stock: 38219AM26LS31CDR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AM26LS31CN-NG is determined by the following critical parameters that must remain constant across equivalent parts:

Electrical Compatibility Requirements:

• Protocol: RS422/RS485 interface standard
• Driver/Receiver Configuration: 4/0 (four drivers, zero receivers)
• Supply Voltage Range: 4.75V ~ 5.25V
• Operating Temperature Range: 0°C ~ 70°C
• Data Rate: 10 Mbps minimum capability

Mechanical Compatibility Requirements:

• Package type must support the application's mounting methodology
• Pin count and pinout must match or be compatible with existing PCB designs
• Physical dimensions must fit within board space constraints

The primary substitute identified is the AM26LS31CDR, which maintains identical electrical specifications while offering an active product status and surface-mount packaging alternative. This part shares the same base product number (AM26LS31) and core functional characteristics, ensuring electrical equivalence for RS422/RS485 driver applications.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Through-Hole Applications):

The AM26LS31CN-NG remains the appropriate choice for existing through-hole PCB designs where the 16-DIP package is already specified. However, due to obsolete product status, inventory depletion should be anticipated. Current stock of 908 pieces represents finite availability.

For New Designs or Redesigns (Surface-Mount Applications):

The AM26LS31CDR is the manufacturer-recommended substitute for new development projects. This part maintains complete electrical equivalence while offering active product status and significantly higher inventory availability (38,110 pieces). The transition from 16-DIP to 16-SOIC packaging requires PCB redesign but provides modern manufacturing compatibility and improved long-term supply chain security.

Compliance Considerations:

Both parts maintain ROHS3 compliance, ensuring regulatory alignment for industrial and commercial applications. The AM26LS31CDR's MSL rating of 1 (Unlimited) provides superior moisture handling characteristics compared to the through-hole variant, beneficial for storage and handling in varied environmental conditions.

Frequently Asked Questions (FAQ)

Q: Can the AM26LS31CDR directly replace the AM26LS31CN-NG on existing PCBs?

A: Electrical substitution is complete; however, mechanical substitution requires PCB modification. The AM26LS31CDR uses 16-SOIC surface-mount packaging versus the 16-DIP through-hole package of the AM26LS31CN-NG. Existing through-hole footprints cannot accommodate surface-mount components without board redesign.

Q: What are the critical parameters that define substitution eligibility?

A: Substitution eligibility is determined by: RS422/RS485 protocol compliance, 4/0 driver/receiver configuration, 4.75V–5.25V supply voltage range, 0°C–70°C operating temperature range, and 10 Mbps data rate capability. Any deviation in these parameters disqualifies a component as an equivalent substitute.

Q: Why is the AM26LS31CN-NG classified as obsolete?

A: Obsolete classification indicates that Texas Instruments has discontinued manufacturing this part. No new production runs are scheduled. Existing inventory represents the final available supply.

Q: Is the AM26LS31CDR electrically identical to the AM26LS31CN-NG?

A: Yes. Both parts share identical electrical specifications including supply voltage, operating temperature range, protocol support, and driver/receiver configuration. The primary difference is packaging format (DIP versus SOIC) and product status (obsolete versus active).

Q: What is the significance of the base product number AM26LS31?

A: The base product number AM26LS31 identifies the core functional design. Suffix variations (CN-NG, CDR) indicate packaging and manufacturing options. Parts sharing the same base number maintain electrical equivalence across different package types.

Q: Are there any compliance or certification differences between these parts?

A: Both parts are ROHS3 compliant. The AM26LS31CDR includes REACH Unaffected status and ECCN/HTSUS classifications relevant to international trade. The AM26LS31CN-NG does not specify these additional certifications in available documentation.

Q: What inventory considerations should influence part selection?

A: The AM26LS31CN-NG has 908 pieces in stock (finite supply). The AM26LS31CDR has 38,110 pieces available (substantially higher availability). For applications requiring long-term component sourcing, the AM26LS31CDR provides superior supply chain continuity.