TE Connectivity 1218440-4 D-Sub Plug 37 Position Equivalent & Substitute Parts

Part Overview

The TE Connectivity 1218440-4 is a 37 position D-Sub plug connector with right-angle solder termination, designed for military and aerospace applications under MIL-DTL-24308 specification. This connector features male pins in a 2-row configuration with shell size 4 (DC, C) layout and cadmium-plated steel housing with gold-plated contacts. The part is currently active in production with 1,080 units in stock.

Substitute parts are necessary when original inventory is unavailable, when RoHS compliance is required for new designs, or when alternative flange configurations better suit specific mounting requirements. The substitute parts listed maintain electrical and mechanical compatibility while offering different housing features and regulatory compliance options.

Substiute Parts

1218440-4

TE Connectivity Aerospace, Defense and MarineIn Stock: 11551218440-4 Datasheet

Current PartRFQ

09654226801

HARTINGIn Stock: 76109654226801 Datasheet

SimilarRFQ

09654226802

HARTINGIn Stock: 80009654226802 Datasheet

SimilarRFQ

09654227801

HARTINGIn Stock: 95209654227801 Datasheet

SimilarRFQ

09654626811

HARTINGIn Stock: 98409654626811 Datasheet

SimilarRFQ

09654627811

HARTINGIn Stock: 116909654627811 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TE Connectivity 1218440-4 is determined by the following critical parameters that must remain constant across all equivalent parts:

Fixed Parameters (Non-Negotiable):

• Connector style: D-Sub
• Connector type: Plug with male pins
• Number of positions: 37
• Number of rows: 2
• Shell size and layout: 4 (DC, C)
• Mounting type: Through hole, right angle
• Termination method: Solder
• Contact type: Signal
• Operating temperature range: -55°C to 125°C

Variable Parameters (Allowable Differences):

• Flange feature configuration (unthreaded, M3, 4-40 threaded)
• Shell material finish (cadmium plated vs. unfinished steel)
• Contact finish and thickness specifications
• Contact material composition (brass vs. copper alloy)
• Current rating (5A vs. 6.5A)
• Backset spacing (0.318" vs. 0.409")
• RoHS compliance status
• Regulatory certifications (UL94 V-0 rating)
• Additional features (grounding indents, board lock)

All five substitute parts (HARTING 09654226801, 09654226802, 09654227801, 09654626811, 09654627811) meet the fixed parameter requirements and are therefore electrically and mechanically compatible with the main part.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection Criteria:

The TE Connectivity 1218440-4 is suitable for legacy military and aerospace systems operating under MIL-DTL-24308 specifications where RoHS non-compliance is acceptable. The part maintains active production status with adequate inventory.

Substitute Selection Based on Regulatory Requirements:

For new designs or systems requiring RoHS3 compliance, all five HARTING substitute parts (09654226801, 09654226802, 09654227801, 09654626811, 09654627811) provide compliant alternatives. These parts carry UL94 V-0 flammability certification, which the original part does not specify.

Flange Configuration Selection:

• HARTING 09654226801 and 09654227801: M3 threaded flange mounting
• HARTING 09654226802: 4-40 threaded flange mounting
• HARTING 09654626811 and 09654627811: M3 threaded flange with board lock feature

Select the flange configuration based on PCB mounting hole specifications and mechanical retention requirements.

Current Rating Consideration:

HARTING substitute parts are rated for 6.5A continuous current, exceeding the 5A rating of the original TE Connectivity part. This higher rating provides additional design margin for applications operating near maximum current specifications.

Backset Spacing Difference:

HARTING parts feature 0.409" (10.40mm) backset spacing compared to 0.318" (8.08mm) for the TE Connectivity part. This difference affects PCB layout and connector positioning. Verify PCB design accommodates the increased backset spacing before substitution.

Inventory Availability:

HARTING 09654627811 offers the highest inventory level (1,110 units), followed by 09654626811 (945 units), providing supply chain flexibility for high-volume applications.

Frequently Asked Questions (FAQ)

Q: Are all HARTING parts electrically compatible with the TE Connectivity 1218440-4?

A: Yes. All five HARTING substitute parts maintain the same connector style, pin count (37 positions), row configuration (2 rows), shell size (4 DC, C), and solder termination. The electrical interface is identical across all parts.

Q: What is the significance of the backset spacing difference (0.318" vs. 0.409")?

A: Backset spacing defines the distance from the connector mounting face to the rear of the connector body. The HARTING parts have a larger backset, which affects PCB layout and available space behind the connector. PCB designs must accommodate this difference. Verify mounting hole positions and clearances before substitution.

Q: Can I substitute a HARTING part with board lock feature for the original TE Connectivity part?

A: Yes, mechanically and electrically. HARTING 09654626811 and 09654627811 include board lock features that provide additional mechanical retention. These features do not interfere with standard connector mating and add functionality without compromising compatibility.

Q: Why do HARTING parts have higher current ratings (6.5A vs. 5A)?

A: The higher current rating reflects the contact material composition and design specifications of the HARTING parts. This provides additional thermal margin and is not a limitation for substitution. Applications designed for 5A operation remain within safe operating parameters with 6.5A-rated parts.

Q: Are the HARTING parts suitable for military applications?

A: HARTING substitute parts are RoHS3 compliant and carry UL94 V-0 flammability certification. They are suitable for commercial and industrial applications. For applications requiring MIL-DTL-24308 certification or military specification compliance, the original TE Connectivity 1218440-4 remains the specified part.

Q: What is the difference between M3 and 4-40 flange configurations?

A: M3 flanges use metric M3 threaded mounting holes (3mm diameter, 0.5mm pitch). 4-40 flanges use imperial 4-40 threaded mounting holes (0.112" diameter, 40 threads per inch). Select based on PCB mounting hole specifications. HARTING 09654226802 is the only substitute with 4-40 configuration.

Q: Can I mix and match different HARTING substitute parts in the same assembly?

A: Yes, all HARTING parts are electrically and mechanically interchangeable. Different flange configurations and features can be used in different connector positions within the same assembly without compatibility issues.

Q: What does the grounding indents feature provide?

A: Grounding indents are mechanical features that facilitate electrical grounding of the connector shell to the PCB. All HARTING substitute parts include this feature, which the original TE Connectivity part does not specify.

Q: Is the contact material difference (brass vs. copper alloy) significant for substitution?

A: Both brass and copper alloy contacts provide adequate electrical conductivity and corrosion resistance for signal applications. The difference does not affect electrical performance or compatibility. Contact finish specifications are more critical than base material for signal integrity.