FMBA14 Equivalent & Substitute Parts

Part Overview

The FMBA14 is a dual NPN bipolar junction transistor array manufactured by onsemi, housed in a SuperSOT-6 surface mount package. This component is classified as a Last Time Buy product, indicating discontinued production with limited remaining inventory. The device operates at maximum collector current of 1.2A and collector-emitter breakdown voltage of 30V, suitable for general-purpose switching and amplification applications in surface mount designs.

Identification of substitute parts becomes necessary due to the Last Time Buy status of the FMBA14, which restricts long-term availability. Alternative components with equivalent electrical characteristics and compatible package specifications ensure design continuity and supply chain reliability.

Substiute Parts

FMBA14

onsemiIn Stock: 1084FMBA14 Datasheet

Current PartRFQ

MMBTA14LT1G

onsemiIn Stock: 125375MMBTA14LT1G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FMBA14 is determined by alignment of the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Collector-emitter breakdown voltage: 30V maximum
• DC current gain (hFE): 20000 minimum at specified conditions
• Vce saturation: 1.5V maximum at 100µA, 100mA
• Collector cutoff current (ICBO): 100nA maximum
• Operating temperature range: -55°C to 150°C

Mechanical Compatibility Criteria:

• Surface mount mounting type
• Compatible package footprint and pin configuration
• Moisture sensitivity level: 1 (Unlimited)

Compliance Criteria:

• RoHS3 compliance
• REACH unaffected status

The MMBTA14LT1G qualifies as a substitute based on matching electrical specifications, surface mount configuration, and regulatory compliance. However, the MMBTA14LT1G is a single NPN Darlington transistor rather than a dual NPN array, requiring circuit design adaptation for applications dependent on the dual-transistor configuration of the FMBA14.

Parameter Comparison

Engineering Selection Recommendations

FMBA14 (Last Time Buy Status): The FMBA14 remains suitable for applications where dual NPN transistor arrays in SuperSOT-6 packaging are specified and current inventory is available. The Last Time Buy status indicates this component will not be replenished beyond existing stock. ROHS3 compliance and unlimited moisture sensitivity level support deployment in standard manufacturing environments.

MMBTA14LT1G (Active Product Status): The MMBTA14LT1G is recommended for new designs and long-term production requirements due to its Active product status and continuous availability. This component maintains electrical equivalence in voltage and gain specifications. The reduced maximum collector current (0.3A versus 1.2A) and power dissipation (225mW versus 700mW) require circuit design verification for applications demanding the higher current capability of the FMBA14. The single transistor configuration necessitates design modification for applications utilizing both transistors in the FMBA14 dual array.

Both components maintain ROHS3 compliance and unlimited moisture sensitivity level, supporting equivalent environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the MMBTA14LT1G directly replace the FMBA14 in existing circuit designs?

A: Direct replacement is not possible without circuit modification. The FMBA14 contains two independent NPN transistors in a single package, while the MMBTA14LT1G is a single Darlington transistor. Applications utilizing both transistors require redesign to accommodate the single-transistor configuration. Additionally, the MMBTA14LT1G maximum collector current of 0.3A is lower than the FMBA14 specification of 1.2A, requiring verification that application current requirements do not exceed this limit.

Q: What are the key electrical differences between these components?

A: The primary electrical differences are maximum collector current (FMBA14: 1.2A; MMBTA14LT1G: 0.3A), maximum power dissipation (FMBA14: 700mW; MMBTA14LT1G: 225mW), and transition frequency (FMBA14: 1.25MHz; MMBTA14LT1G: 125MHz). Collector-emitter breakdown voltage, saturation voltage, and DC current gain specifications are equivalent between the two components.

Q: Are the package footprints compatible?

A: No. The FMBA14 uses a SuperSOT-6 (SOT-23-6 Thin, TSOT-23-6) package, while the MMBTA14LT1G uses a SOT-23-3 (TO-236-3, SC-59) package. These packages have different pin counts and footprints, requiring PCB redesign for component substitution.

Q: What is the significance of the Last Time Buy status for the FMBA14?

A: Last Time Buy status indicates that onsemi will not manufacture additional units of the FMBA14 beyond current inventory. Existing stock is available for purchase, but long-term supply cannot be guaranteed. For applications requiring sustained production beyond available inventory, transition to an active product such as the MMBTA14LT1G is necessary.

Q: Do both components meet the same regulatory and environmental standards?

A: Yes. Both the FMBA14 and MMBTA14LT1G are ROHS3 compliant, REACH unaffected, and classified as Moisture Sensitivity Level 1 (Unlimited). Both components support equivalent environmental and regulatory deployment requirements.

Q: Which component should be selected for new product designs?

A: The MMBTA14LT1G should be selected for new designs due to its Active product status and assured long-term availability. Circuit design must accommodate the single-transistor configuration and verify that maximum collector current and power dissipation specifications meet application requirements.