BF199_D74Z Equivalent & Substitute Parts

Part Overview

The BF199_D74Z is an RF transistor NPN manufactured by onsemi, rated for 25V collector-emitter breakdown voltage and 1.1GHz transition frequency. This through-hole TO-92-3 package device is designed for RF applications requiring moderate frequency operation and 350mW power dissipation. The BF199_D74Z carries an obsolete product status, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	BF199_D74Z
Manufacturer	onsemi
Category	Transistors, Bipolar (BJT)
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	25V
Frequency - Transition	1.1GHz
Power - Max	350mW
Current - Collector (Ic) (Max)	50mA
DC Current Gain (hFE) (Min) @ Ic, Vce	38 @ 7mA, 10V
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution of the BF199_D74Z is determined by the following critical parameters:

Electrical Compatibility Criteria:

Transistor Type: NPN configuration required
Voltage Rating: Collector-emitter breakdown voltage must equal or exceed 25V
Frequency Performance: Transition frequency must support 1.1GHz operation
Current Capability: Maximum collector current must accommodate 50mA
Power Dissipation: Maximum power rating must support 350mW
DC Current Gain: hFE characteristics must be compatible with circuit design

Mechanical and Environmental Criteria:

Mounting Type: Through-hole or surface-mount configurations
Operating Temperature Range: Must support -55°C to 150°C junction temperature
Moisture Sensitivity: MSL rating of 1 (Unlimited) preferred
Regulatory Compliance: REACH Unaffected status required

The substitute parts listed below meet the electrical requirements for RF NPN transistor applications. However, mounting type transitions from through-hole to surface-mount represent a significant mechanical change requiring PCB redesign. Voltage ratings in substitute parts are lower than the original 25V specification, indicating these substitutes are suitable for applications operating at reduced voltage levels.

Parameter Comparison

Parameter	BF199_D74Z	BF776H6327XTSA1	BFP420H6740XTSA1	BFP520H6327XTSA1	BFP640FH6327XTSA1	HFA3102BZ96
Manufacturer	onsemi	Infineon Technologies	Infineon Technologies	Infineon Technologies	Infineon Technologies	Renesas Electronics
Transistor Type	NPN	NPN	NPN	NPN	NPN	6 NPN
Voltage - Collector Emitter Breakdown (Max)	25V	4.7V	5V	3.5V	4.5V	12V
Frequency - Transition	1.1GHz	46GHz	25GHz	45GHz	40GHz	10GHz
Power - Max	350mW	200mW	160mW	100mW	200mW	250mW
Current - Collector (Ic) (Max)	50mA	50mA	35mA	40mA	50mA	30mA
DC Current Gain (hFE) (Min) @ Ic, Vce	38 @ 7mA, 10V	180 @ 30mA, 3V	60 @ 20mA, 4V	70 @ 20mA, 2V	110 @ 30mA, 3V	40 @ 10mA, 3V
Operating Temperature	-55°C ~ 150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)
Mounting Type	Through Hole	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-226-3, TO-92-3	SC-82A, SOT-343	SC-82A, SOT-343	SC-82A, SOT-343	4-SMD, Flat Leads	14-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete	Active	Active	Active	Active	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Product Status Considerations:

The BF199_D74Z is classified as obsolete, necessitating substitution for new designs and ongoing production support. All listed substitute parts carry active product status, ensuring long-term availability and manufacturing support from their respective manufacturers.

Compliance and Regulatory Status:

All substitute parts maintain REACH Unaffected status, matching the regulatory compliance profile of the original BF199_D74Z. The HFA3102BZ96 carries MSL-3 (168 Hours) moisture sensitivity, requiring controlled storage and handling procedures compared to the MSL-1 (Unlimited) rating of the BF199_D74Z and other Infineon substitutes.

Voltage Rating Implications:

The BF199_D74Z operates at 25V maximum collector-emitter breakdown voltage. All Infineon substitute parts (BF776H6327XTSA1, BFP420H6740XTSA1, BFP520H6327XTSA1, BFP640FH6327XTSA1) operate at reduced voltage ratings between 3.5V and 5V. The HFA3102BZ96 operates at 12V. Selection of substitutes for applications requiring the full 25V rating is not supported by the provided electrical parameters.

Mounting Type Transition:

The BF199_D74Z uses through-hole TO-92-3 packaging. All substitute parts employ surface-mount technology (SOT-343, 4-TSFP, or 14-SOIC packages). This transition requires PCB redesign and assembly process modification.

Frequency Performance:

All substitute parts exceed the 1.1GHz transition frequency of the BF199_D74Z, with frequencies ranging from 10GHz to 46GHz. This provides frequency margin for RF applications.

Frequently Asked Questions (FAQ)

Q: Can the BF776H6327XTSA1 directly replace the BF199_D74Z in existing through-hole PCB designs?

A: No. The BF776H6327XTSA1 is a surface-mount device in SOT-343 package, while the BF199_D74Z uses through-hole TO-92-3 packaging. PCB redesign is required for mounting compatibility.

Q: What is the primary limitation when substituting the BF199_D74Z with the listed Infineon parts?

A: The Infineon substitute parts (BF776H6327XTSA1, BFP420H6740XTSA1, BFP520H6327XTSA1, BFP640FH6327XTSA1) operate at maximum collector-emitter breakdown voltages between 3.5V and 5V, compared to the BF199_D74Z rating of 25V. These substitutes are suitable only for applications operating at reduced voltage levels.

Q: Is the HFA3102BZ96 suitable for applications requiring 25V operation?

A: The HFA3102BZ96 operates at 12V maximum collector-emitter breakdown voltage, which is below the 25V requirement of the BF199_D74Z. This part is not suitable for applications requiring the full 25V voltage rating.

Q: What is the difference in moisture sensitivity between the HFA3102BZ96 and other substitute parts?

A: The HFA3102BZ96 carries MSL-3 (168 Hours) rating, requiring controlled storage at specified temperature and humidity conditions. The BF199_D74Z and all Infineon substitute parts carry MSL-1 (Unlimited) rating, allowing unlimited shelf life under normal storage conditions.

Q: Do all substitute parts support the -55°C to 150°C operating temperature range of the BF199_D74Z?

A: The substitute parts specify 150°C maximum junction temperature. The BF199_D74Z specifies -55°C to 150°C operating range. Substitute parts do not explicitly state minimum operating temperature; verification of low-temperature performance is required for applications requiring -55°C operation.

Q: Which substitute part provides the closest electrical match to the BF199_D74Z?

A: The HFA3102BZ96 provides the closest voltage rating match at 12V (compared to 25V for the BF199_D74Z) and operates at 10GHz transition frequency. However, it uses 14-SOIC surface-mount packaging and carries MSL-3 moisture sensitivity. All other substitutes operate at significantly lower voltage ratings (3.5V to 5V).

Q: Are all substitute parts RoHS compliant?

A: All substitute parts carry ROHS3 Compliant status, matching the regulatory compliance requirements for modern electronic component procurement.

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