L407CDB RF PIN Diode Equivalent & Substitute Parts

Part Overview

The L407CDB is an RF PIN diode manufactured by CEL, designed for RF switching and attenuation applications. It features a 180V peak reverse voltage rating, 1W power dissipation capability, and is packaged in a DO-41 axial glass configuration. The part is currently classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Substiute Parts

L407CDB

CELIn Stock: 886L407CDB Datasheet

Current PartRFQ

L8104

CELIn Stock: 1269L8104 Datasheet

MFR RecommendedRFQ

L9204F

CELIn Stock: 1043L9204F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for RF PIN diodes is determined by the following parameters: peak reverse voltage rating, maximum current capacity, power dissipation capability, and diode type classification. All substitute parts must maintain the 180V peak reverse voltage specification to ensure circuit compatibility. The L407CDB operates at a maximum current of 100 mA with 1W power dissipation.

The two qualified substitutes are:

L8104: Maintains 180V peak reverse voltage and PIN diode type. Offers increased power dissipation (3W) with reduced maximum current (50 mA). Package format changes from axial to MELF.

L9204F: Maintains 180V peak reverse voltage and PIN diode type. Matches 1W power dissipation with reduced maximum current (50 mA). Package format changes from axial to SOD-123ST surface mount.

Both substitutes preserve the critical voltage specification while accepting trade-offs in current capacity and package configuration based on application requirements.

Parameter Comparison

Engineering Selection Recommendations

L8104 Selection Criteria: Choose this substitute when circuit design permits MELF package integration and higher power dissipation capability is beneficial. The L8104 is RoHS3 compliant and maintains active product status, ensuring long-term availability. Maximum current rating of 50 mA is suitable for applications where the original 100 mA specification exceeds actual circuit requirements.

L9204F Selection Criteria: Choose this substitute for surface-mount applications requiring SOD-123ST package compatibility. The L9204F is RoHS3 compliant and maintains active product status. Operating temperature maximum of 150°C is acceptable for applications operating below this threshold. The 50 mA maximum current rating applies the same constraint as L8104.

Both substitutes carry REACH Unaffected and EAR99 ECCN classifications, matching the original part's regulatory status. Selection between L8104 and L9204F depends on package format requirements: MELF for through-hole or hybrid applications, SOD-123ST for surface-mount PCB designs.

Frequently Asked Questions (FAQ)

Q: Can L8104 or L9204F be used as direct pin-for-pin replacements for L407CDB?

A: No. While all three parts share identical 180V peak reverse voltage and PIN diode type, package formats differ significantly. L407CDB uses DO-41 axial packaging, L8104 uses MELF, and L9204F uses SOD-123ST surface mount. PCB layout and circuit board design must accommodate the selected substitute package.

Q: What is the impact of reduced maximum current (50 mA vs. 100 mA) in the substitutes?

A: The substitutes are suitable for applications where forward current does not exceed 50 mA. If the original circuit design requires 100 mA forward current capability, neither substitute is appropriate. Circuit analysis must confirm that actual operating current remains within the 50 mA limit of the substitute parts.

Q: Are there compliance or availability differences between L8104 and L9204F?

A: Both parts are RoHS3 compliant, REACH Unaffected, and carry EAR99 ECCN classification. Both maintain active product status with current inventory availability. The primary difference is package format: L8104 is MELF (through-hole compatible), and L9204F is SOD-123ST (surface mount).

Q: How do the capacitance and resistance specifications compare?

A: L9204F exhibits the lowest capacitance (0.9pF) and resistance (650mOhm), followed by L8104 (1.2pF, 750mOhm), and L407CDB (2pF, 800mOhm). Lower capacitance and resistance values in the substitutes may improve high-frequency performance characteristics in RF switching applications.

Q: What is the significance of the operating temperature difference in L9204F?

A: L9204F has a maximum junction temperature of 150°C compared to 175°C for L407CDB and L8104. Applications operating in high-temperature environments or with elevated thermal loads must ensure that the 150°C limit is not exceeded during normal operation.