SS9018HBU Equivalent & Substitute Parts

Part Overview

The SS9018HBU is an RF transistor NPN manufactured by onsemi, rated for 15V collector-emitter breakdown voltage with a transition frequency of 1.1GHz and maximum power dissipation of 400mW. This device is packaged in a through-hole TO-92-3 configuration and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and system maintenance. Substitute parts must maintain functional compatibility within the electrical and mechanical constraints of the original application.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	15V	V
Frequency - Transition	1.1GHz	GHz
Power - Max	400mW	mW
Current - Collector (Ic) (Max)	50mA	mA
DC Current Gain (hFE) (Min) @ Ic, Vce	97 @ 1mA, 5V	—
Operating Temperature (TJ)	150°C	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SS9018HBU is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN (required match)
Voltage - Collector Emitter Breakdown (Max): Must equal or exceed 15V
Frequency - Transition: Must equal or exceed 1.1GHz
Power - Max: Must equal or exceed 400mW
Current - Collector (Ic) (Max): Must equal or exceed 50mA
Operating Temperature: Must support 150°C (TJ)
RoHS Compliance: ROHS3 Compliant (required match)

Secondary Considerations:

Mounting Type: Through Hole preferred; Surface Mount substitutes acceptable with design modification
Package compatibility: TO-92-3 through-hole preferred; alternative packages require PCB redesign

Substitute parts are grouped into two categories based on mounting technology:

Category 1: Surface Mount Substitutes — Parts with enhanced frequency performance and reduced power dissipation, suitable for applications where PCB redesign is feasible.

Category 2: High-Power Substitutes — Parts with significantly elevated power ratings and current handling, applicable to high-power RF applications.

Parameter Comparison

Part Number	Manufacturer	Transistor Type	Vce Breakdown (Max)	Frequency - Transition	Power - Max	Ic (Max)	hFE (Min)	Mounting Type	Package	Product Status
SS9018HBU	onsemi	NPN	15V	1.1GHz	400mW	50mA	97 @ 1mA, 5V	Through Hole	TO-92-3	Obsolete
2SC4215-Y(TE85L,F)	Toshiba Semiconductor and Storage	NPN	30V	550MHz	100mW	20mA	100 @ 1mA, 6V	Surface Mount	SC-70	Active
BFP182RE7764HTSA1	Infineon Technologies	NPN	12V	8GHz	250mW	35mA	70 @ 10mA, 8V	Surface Mount	SOT-143R	Active
BFP540ESDH6327XTSA1	Infineon Technologies	NPN	5V	30GHz	250mW	80mA	50 @ 20mA, 3.5V	Surface Mount	SOT-343	Active
BFP840ESDH6327XTSA1	Infineon Technologies	NPN	2.25V	80GHz	75mW	35mA	150 @ 10mA, 1.8V	Surface Mount	SOT-343	Active
MAX2602ESA+	Analog Devices Inc./Maxim Integrated	NPN	15V	1GHz	6.4W	1.2A	100 @ 250mA, 3V	Surface Mount	8-SOIC-EP	Active
MRF327	MACOM Technology Solutions	NPN	33V	—	80W	9A	20 @ 4A, 5V	Chassis Mount	316-01	Active

Engineering Selection Recommendations

Direct Electrical Equivalent:

The MAX2602ESA+ provides the closest electrical match to the SS9018HBU. Both devices share identical collector-emitter breakdown voltage (15V) and comparable transition frequency (1GHz vs. 1.1GHz). The MAX2602ESA+ exceeds the original part in power dissipation (6.4W vs. 400mW) and collector current (1.2A vs. 50mA), making it suitable for applications requiring higher power handling. This part is manufactured by Analog Devices Inc./Maxim Integrated and maintains Active product status with ROHS3 compliance.

High-Frequency Surface Mount Alternative:

The BFP182RE7764HTSA1 (Infineon Technologies) offers significantly enhanced transition frequency (8GHz) while maintaining compatible collector-emitter breakdown voltage (12V, exceeding the 15V requirement is not necessary for lower-voltage applications). This part is suitable for RF applications requiring higher frequency performance. Surface mount packaging requires PCB redesign.

Ultra-High-Frequency Alternative:

The BFP540ESDH6327XTSA1 (Infineon Technologies) provides transition frequency of 30GHz with collector current capability of 80mA, exceeding the original 50mA specification. This part is applicable to millimeter-wave and high-frequency RF applications. Collector-emitter breakdown voltage is reduced to 5V; this part is suitable only for low-voltage applications.

High-Power Alternative:

The MRF327 (MACOM Technology Solutions) is a chassis-mount RF transistor rated for 33V collector-emitter breakdown voltage, 80W power dissipation, and 9A collector current. This part is applicable to high-power RF amplification stages and transmitter applications. Mounting type differs significantly from the original through-hole package.

Compliance and Availability:

All substitute parts listed maintain ROHS3 compliance and Active product status, ensuring long-term availability and regulatory compliance. The SS9018HBU is classified as Obsolete; substitution is necessary for new designs and production continuity.

Frequently Asked Questions (FAQ)

Q: Can the MAX2602ESA+ directly replace the SS9018HBU in existing designs?

A: The MAX2602ESA+ is electrically compatible with the SS9018HBU in terms of collector-emitter breakdown voltage (15V) and transition frequency (1GHz vs. 1.1GHz). However, the MAX2602ESA+ is a surface-mount device in 8-SOIC-EP package, whereas the SS9018HBU is a through-hole TO-92-3 device. Direct PCB substitution is not possible without redesign. Pin configuration and biasing networks must be verified against the respective datasheets.

Q: What is the primary reason for substituting the SS9018HBU?

A: The SS9018HBU is classified as Obsolete. Substitution is necessary to ensure production continuity, maintain design support, and secure long-term component availability. All listed substitute parts maintain Active product status.

Q: Which substitute part offers the best frequency performance?

A: The BFP840ESDH6327XTSA1 provides the highest transition frequency at 80GHz. However, this part has a reduced collector-emitter breakdown voltage of 2.25V and is suitable only for low-voltage RF applications. For applications requiring both high frequency and 15V voltage rating, the BFP182RE7764HTSA1 (8GHz) is recommended.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance, meeting regulatory requirements for hazardous substance restrictions.

Q: What mounting considerations apply to surface-mount substitutes?

A: Surface-mount substitutes (2SC4215-Y, BFP182RE7764HTSA1, BFP540ESDH6327XTSA1, BFP840ESDH6327XTSA1, MAX2602ESA+) require PCB redesign to accommodate different package geometries and land patterns. Through-hole TO-92-3 designs cannot accommodate surface-mount devices without significant circuit board modification.

Q: Can the BFP540ESDH6327XTSA1 be used in 15V applications?

A: No. The BFP540ESDH6327XTSA1 has a maximum collector-emitter breakdown voltage of 5V. This part is suitable only for applications operating at 5V or lower. Use of this part in 15V circuits will result in device failure.

Q: What is the primary advantage of the MRF327 over the SS9018HBU?

A: The MRF327 provides significantly higher power dissipation (80W vs. 400mW) and collector current (9A vs. 50mA), making it suitable for high-power RF amplification and transmitter applications. The MRF327 uses chassis-mount packaging, requiring mechanical redesign of the assembly.

Q: How do I verify compatibility of a substitute part with my application?

A: Verify that the substitute part meets or exceeds the following parameters from the original SS9018HBU specification: collector-emitter breakdown voltage (15V minimum), transition frequency (1.1GHz minimum), power dissipation (400mW minimum), and collector current (50mA minimum). Confirm RoHS compliance and operating temperature range (150°C TJ). Review the substitute part datasheet for biasing requirements, noise figure, and gain characteristics specific to your application frequency and power level.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message