40FLZ-SM1-R-TB FFC/FPC Connector Equivalent & Substitute Parts

Part Overview

The 40FLZ-SM1-R-TB is a 40-position FFC/FPC connector manufactured by JST Sales America Inc., designed for surface mount, right-angle applications with 0.5mm pitch contacts. This connector features zero insertion force (ZIF) operation, slide lock retention, and solder termination for flat flexible cable assemblies. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing production support and design updates.

Substiute Parts

40FLZ-SM1-R-TB

JST Sales America Inc.In Stock: 110040FLZ-SM1-R-TB Datasheet

Current PartRFQ

40FLZ-SM2-R-TB(LF)(SN)(P)-

JST Sales America Inc.In Stock: 70240FLZ-SM2-R-TB(LF)(SN)(P)- Datasheet

DirectRFQ

4-1734839-0

TE Connectivity AMP ConnectorsIn Stock: 3305684-1734839-0 Datasheet

SimilarRFQ

ZF5S-40-01-T-WT-TR

Samtec Inc.In Stock: 1127ZF5S-40-01-T-WT-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 40FLZ-SM1-R-TB is determined by the following critical parameters:

Primary Matching Criteria:

• Number of positions: 40
• Pitch: 0.020" (0.50mm)
• Mounting type: Surface mount, right angle
• Termination: Solder
• Locking feature: Slide lock
• Features: Zero insertion force (ZIF), solder retention

Substitute Classification:

Direct Substitute (Preferred): 40FLZ-SM2-R-TB(LF)(SN)(P)- meets all primary matching criteria and is manufactured by the same supplier (JST Sales America Inc.). This part is active and RoHS3 compliant, providing a direct replacement path from the obsolete 40FLZ-SM1-R-TB.

Similar Substitutes (Cross-Manufacturer): 4-1734839-0 (TE Connectivity) and ZF5S-40-01-T-WT-TR (Samtec Inc.) share the core functional parameters (40 positions, 0.5mm pitch, surface mount right angle, ZIF, slide lock) but introduce variations in contact type location, material composition, and electrical ratings that require design verification.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement: Select 40FLZ-SM2-R-TB(LF)(SN)(P)- as the primary substitute. This part maintains identical electrical and mechanical specifications to the 40FLZ-SM1-R-TB while offering active product status and RoHS3 compliance. The transition from tin-lead to tin contact finish and PA46 to PA6T housing material represents a manufacturing evolution within the same product family, with no functional impact on connector performance.

For Cross-Manufacturer Substitution: 4-1734839-0 (TE Connectivity) is suitable when JST supply is unavailable. This part exceeds the original voltage rating (250V vs. 50V) and maintains equivalent current capacity. The gold contact finish provides enhanced corrosion resistance. Height variation (2.05mm vs. 2.00mm) requires PCB layout verification.

For Extended Temperature Range Applications: ZF5S-40-01-T-WT-TR (Samtec Inc.) supports -55°C to 105°C operation and delivers higher current capacity (1.8A per contact). The bottom contact configuration requires PCB redesign and cable assembly modification. This option is suitable only when extended thermal performance is a design requirement.

Compliance Consideration: All active substitutes are RoHS3 compliant. If legacy RoHS non-compliant designs must be maintained, only the obsolete 40FLZ-SM1-R-TB meets this requirement; however, this is not recommended for new designs.

Frequently Asked Questions (FAQ)

Q: Can 40FLZ-SM2-R-TB(LF)(SN)(P)- be used as a direct drop-in replacement for 40FLZ-SM1-R-TB?

A: Yes. Both parts share identical position count (40), pitch (0.5mm), mounting configuration (surface mount right angle), height above board (2.00mm), and electrical ratings (50V, 0.5A). The contact finish change from tin-lead to tin and housing material upgrade from PA46 to PA6T represent manufacturing improvements with no functional impact on connector operation.

Q: What is the primary difference between the JST 40FLZ-SM2-R-TB(LF)(SN)(P)- and the TE Connectivity 4-1734839-0?

A: The TE Connectivity part features a higher voltage rating (250V vs. 50V), gold contact finish instead of tin, and a 0.05mm height increase (2.05mm vs. 2.00mm). Both maintain 40 positions, 0.5mm pitch, and top contact configuration. The height difference may require PCB layout verification for clearance-critical applications.

Q: Why is the Samtec ZF5S-40-01-T-WT-TR listed as a similar substitute rather than a direct substitute?

A: The Samtec part uses a bottom contact configuration instead of top contacts, requiring PCB redesign and cable assembly modification. Additionally, it specifies 1.8A per contact versus 0.5A for the original part, and supports an extended temperature range (-55°C to 105°C). These differences necessitate design verification before implementation.

Q: Are all active substitutes RoHS3 compliant?

A: Yes. The 40FLZ-SM2-R-TB(LF)(SN)(P)-, 4-1734839-0, and ZF5S-40-01-T-WT-TR are all RoHS3 compliant. The original 40FLZ-SM1-R-TB is RoHS non-compliant and obsolete.

Q: What packaging formats are available for these substitutes?

A: 40FLZ-SM2-R-TB(LF)(SN)(P)- is supplied in Tape & Reel (TR) format. 4-1734839-0 is available in Cut Tape (CT). ZF5S-40-01-T-WT-TR is supplied in Tape & Reel (TR) format. Packaging selection depends on production volume and assembly line requirements.

Q: Can the 40FLZ-SM1-R-TB be used in new designs?

A: No. The part is obsolete and RoHS non-compliant. New designs must use 40FLZ-SM2-R-TB(LF)(SN)(P)- or equivalent active substitutes to ensure long-term supply availability and regulatory compliance.