Equivalent & Substitute Parts for 2SA07770R

Part Overview

The 2SA07770R is a Panasonic Electronic Components PNP bipolar junction transistor (BJT) rated for 80 V collector-emitter breakdown voltage and 500 mA maximum collector current. Housed in a TO-92L-A1 through-hole package, this device is designed for general-purpose switching and amplification applications requiring 1 W power dissipation capability.

The 2SA07770R is classified as obsolete. Locating equivalent substitute parts is necessary to support ongoing production requirements, maintenance operations, and design continuity where this component is specified in existing schematics and bill of materials documentation.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Max)	500	mA
Collector-Emitter Breakdown Voltage (Max)	80	V
Power Dissipation (Max)	1	W
Transition Frequency	120	MHz
Operating Temperature (Max)	150	°C
Mounting Type	Through Hole	—
Package	TO-92L-A1	—

Substitute Part Grouping Explanation

Substitution of the 2SA07770R is determined by electrical parameter compatibility across the following criteria:

Electrical Compatibility Requirements:

Transistor type must be PNP
Collector current rating must equal or exceed 500 mA
Collector-emitter breakdown voltage must equal or exceed 80 V
Operating temperature range must support 150°C maximum junction temperature
Transition frequency must support the intended application bandwidth

Identified Substitute Parts:

The 2SB1198KT146Q and 2SB1198KT146R (both Rohm Semiconductor) satisfy the electrical parameter requirements for substitution. Both devices are active-status PNP transistors with 500 mA collector current rating and 80 V breakdown voltage specification. Both operate at 150°C maximum junction temperature.

Package Consideration:

The substitute parts are surface-mount devices in SMT3 (SOT-23-3) packaging, whereas the 2SA07770R is a through-hole TO-92L-A1 device. Direct board-level substitution without circuit board redesign is not possible. Implementation of these substitutes requires either PCB layout modification to accommodate surface-mount footprints or selection of alternative through-hole equivalents if available.

Parameter Comparison

Parameter	2SA07770R (Panasonic)	2SB1198KT146Q (Rohm)	2SB1198KT146R (Rohm)
Transistor Type	PNP	PNP	PNP
Collector Current (Max)	500 mA	500 mA	500 mA
Collector-Emitter Breakdown Voltage (Max)	80 V	80 V	80 V
Vce Saturation (Max) @ 50mA, 500mA	400 mV / 500 mV	500 mV	500 mV
Collector Cutoff Current (Max)	100 nA	500 nA	500 nA
DC Current Gain (hFE) Min	130 @ 150mA, 10V	120 @ 100mA, 3V	180 @ 100mA, 3V
Power Dissipation (Max)	1 W	200 mW	200 mW
Transition Frequency	120 MHz	180 MHz	180 MHz
Operating Temperature (Max)	150°C	150°C	150°C
Mounting Type	Through Hole	Surface Mount	Surface Mount
Package	TO-92L-A1	SMT3 (SOT-23-3)	SMT3 (SOT-23-3)
Product Status	Obsolete	Active	Active
RoHS Compliance	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Product Status Consideration:

The 2SA07770R is classified as obsolete, whereas both 2SB1198KT146Q and 2SB1198KT146R are active-status components. Active-status parts offer superior long-term availability and supply chain stability for ongoing production and field service applications.

Compliance and Certification:

The 2SA07770R is RoHS non-compliant. Both substitute parts (2SB1198KT146Q and 2SB1198KT146R) are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for new product designs and manufacturing operations subject to these standards.

Electrical Performance:

Both Rohm substitutes exceed the electrical requirements of the 2SA07770R across all critical parameters: collector current, breakdown voltage, and operating temperature. The 2SB1198KT146R offers superior DC current gain (180 minimum) compared to the 2SA07770R (130 minimum), providing enhanced amplification characteristics in gain-sensitive applications.

Power Dissipation Trade-off:

The substitute parts are rated for 200 mW maximum power dissipation, compared to 1 W for the 2SA07770R. Applications requiring sustained power dissipation exceeding 200 mW must be evaluated for thermal management compatibility or alternative component selection.

Packaging Constraint:

Selection between 2SB1198KT146Q and 2SB1198KT146R requires circuit board redesign to accommodate surface-mount SMT3 footprints. Through-hole applications cannot use these substitutes without board-level modification.

Frequently Asked Questions (FAQ)

Q: Can the 2SB1198KT146Q or 2SB1198KT146R be used as direct pin-for-pin replacements for the 2SA07770R?

A: No. The 2SA07770R uses through-hole TO-92L-A1 packaging, while both Rohm substitutes use surface-mount SMT3 (SOT-23-3) packaging. Pin-for-pin replacement is not possible without circuit board redesign. The pinout topology differs between through-hole and surface-mount packages.

Q: What are the key electrical parameters that make the 2SB1198KT146Q and 2SB1198KT146R suitable substitutes?

A: Both parts meet or exceed the critical electrical specifications: 500 mA collector current, 80 V collector-emitter breakdown voltage, 150°C maximum operating temperature, and PNP transistor type. These parameters define functional equivalence for the 2SA07770R application space.

Q: How does the 200 mW power rating of the substitutes compare to the 1 W rating of the 2SA07770R?

A: The 2SA07770R supports continuous power dissipation up to 1 W, while the substitutes are limited to 200 mW. Applications dissipating more than 200 mW require thermal analysis to confirm the substitutes remain within safe operating limits, or alternative components with higher power ratings must be selected.

Q: What is the difference between 2SB1198KT146Q and 2SB1198KT146R?

A: Both parts are electrically equivalent with identical electrical specifications except for DC current gain: 2SB1198KT146Q specifies 120 minimum hFE at 100 mA and 3 V, while 2SB1198KT146R specifies 180 minimum hFE at the same conditions. The 2SB1198KT146R provides higher current gain for amplification-sensitive applications.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both 2SB1198KT146Q and 2SB1198KT146R are ROHS3 compliant, whereas the 2SA07770R is RoHS non-compliant. This compliance difference is significant for new product designs and manufacturing operations subject to RoHS regulations.

Q: What is the transition frequency difference between the 2SA07770R and the substitutes?

A: The 2SA07770R operates at 120 MHz transition frequency, while both substitutes operate at 180 MHz. The higher transition frequency of the substitutes supports faster switching applications and higher-frequency signal processing without performance degradation.

Q: Can I use the substitutes in legacy equipment designed for the 2SA07770R?

A: Electrical substitution is possible only if the equipment uses surface-mount technology compatible with SMT3 footprints. Through-hole equipment cannot accommodate surface-mount substitutes without board modification. Thermal and power dissipation limits must also be verified for the specific application.

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