MMSTA05-7 Equivalent & Substitute Parts

Part Overview

The MMSTA05-7 is a surface mount NPN bipolar junction transistor manufactured by Diodes Incorporated in SOT-323 packaging. This component is rated for 60 V collector-emitter breakdown voltage with a maximum collector current of 500 mA and 200 mW power dissipation. The MMSTA05-7 is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production needs.

Key Parameters

Parameter	Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	60 V
Current - Collector (Ic) (Max)	500 mA
Power - Max	200 mW
Frequency - Transition	100 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 100mA, 1V
Vce Saturation (Max) @ Ib, Ic	250mV @ 10mA, 100mA
Current - Collector Cutoff (Max)	100nA
Operating Temperature	-55°C ~ 150°C (TJ)
Package / Case	SC-70, SOT-323
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MMSTA05-7 is determined by the following critical parameters:

Electrical Parameters:

Transistor type (NPN)
Collector-emitter breakdown voltage rating (60 V minimum for direct equivalence; 45 V acceptable for reduced voltage applications)
Maximum collector current (500 mA)
Power dissipation capability (200 mW minimum)
Transition frequency (100 MHz minimum)
DC current gain (hFE) characteristics

Mechanical Parameters:

Package type (SOT-323 / SC-70)
Surface mount configuration
Moisture sensitivity level (MSL 1)

Compliance Parameters:

RoHS status
REACH compliance
Automotive qualification (AEC-Q101) where applicable

Substitute parts are grouped into two categories: parametric equivalents (identical electrical specifications) and functional substitutes (compatible electrical performance with minor parameter variations).

Parameter Comparison

Part Number	Manufacturer	Vce Breakdown (Max)	Ic (Max)	Power (Max)	Frequency	hFE (Min)	Vce Sat (Max)	Package	Product Status	RoHS
MMSTA05-7	Diodes Incorporated	60 V	500 mA	200 mW	100 MHz	100 @ 100mA, 1V	250mV @ 10mA, 100mA	SOT-323	Discontinued	Non-compliant
MMSTA05-7-F	Diodes Incorporated	60 V	500 mA	200 mW	100 MHz	100 @ 100mA, 1V	250mV @ 10mA, 100mA	SOT-323	Active	ROHS3 Compliant
BC817-16W,115	NXP USA Inc.	45 V	500 mA	200 mW	100 MHz	100 @ 100mA, 1V	700mV @ 50mA, 500mA	SOT-323	Active	ROHS3 Compliant
BC817-25W RFG	Taiwan Semiconductor Corporation	45 V	500 mA	200 mW	100 MHz	160 @ 100mA, 1V	700mV @ 50mA, 500mA	SOT-323	Active	ROHS3 Compliant
BC817K25WH6327XTSA1	Infineon Technologies	45 V	500 mA	250 mW	170 MHz	160 @ 100mA, 1V	700mV @ 50mA, 500mA	SOT-323	Last Time Buy	ROHS3 Compliant
BC817W,115	Nexperia USA Inc.	45 V	500 mA	200 mW	100 MHz	100 @ 100mA, 1V	700mV @ 50mA, 500mA	SOT-323	Active	ROHS3 Compliant
BC817W,135	Nexperia USA Inc.	45 V	500 mA	200 mW	100 MHz	100 @ 100mA, 1V	700mV @ 50mA, 500mA	SOT-323	Active	ROHS3 Compliant
PMSTA05,115	NXP Semiconductors	60 V	500 mA	200 mW	100 MHz	50 @ 100mA, 1V	250mV @ 10mA, 100mA	SOT-323	Active	Not specified

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement):

MMSTA05-7-F is the primary parametric equivalent. This part maintains identical electrical specifications including 60 V breakdown voltage, 500 mA collector current, and 250 mV saturation voltage characteristics. The MMSTA05-7-F is manufactured by Diodes Incorporated with active product status and ROHS3 compliance, providing direct compatibility with existing designs without circuit modification.

Voltage-Reduced Substitutes (45 V Breakdown Rating):

The BC817 series components (BC817-16W,115; BC817-25W RFG; BC817W,115; BC817W,135) operate at 45 V maximum breakdown voltage, representing a 15 V reduction from the MMSTA05-7 specification. These substitutes are suitable for applications where the circuit design voltage does not exceed 45 V. All BC817 variants maintain 500 mA collector current and 100 MHz transition frequency. The BC817W variants from Nexperia include AEC-Q101 automotive qualification. BC817-25W RFG exhibits higher DC current gain (160 vs. 100) and is available from Taiwan Semiconductor Corporation.

Voltage-Equivalent with Enhanced Performance:

PMSTA05,115 from NXP Semiconductors maintains the 60 V breakdown voltage rating and identical saturation voltage characteristics. However, this part exhibits reduced DC current gain (50 vs. 100 @ 100mA, 1V) and includes AEC-Q101 automotive qualification. This component is suitable for applications requiring 60 V rating with automotive-grade reliability.

Enhanced Performance Substitute (Last Time Buy):

BC817K25WH6327XTSA1 from Infineon Technologies provides 45 V breakdown voltage with enhanced transition frequency (170 MHz vs. 100 MHz) and increased power dissipation (250 mW vs. 200 mW). This part is designated Last Time Buy status and should be evaluated for long-term availability constraints.

Compliance Considerations:

All recommended substitutes except PMSTA05,115 carry explicit ROHS3 compliance certification. The MMSTA05-7-F provides the most direct compliance path as a ROHS3-compliant variant from the original manufacturer.

Frequently Asked Questions (FAQ)

Q: Can MMSTA05-7-F be used as a direct replacement for MMSTA05-7?

A: Yes. MMSTA05-7-F is a parametric equivalent with identical electrical specifications. Both parts are manufactured by Diodes Incorporated in SOT-323 packaging with matching 60 V breakdown voltage, 500 mA collector current, and saturation voltage characteristics. The primary difference is product status (MMSTA05-7-F is active) and RoHS compliance (MMSTA05-7-F is ROHS3 compliant).

Q: What is the impact of using BC817 series parts rated at 45 V instead of 60 V?

A: The 45 V breakdown voltage rating is suitable for circuits designed to operate below 45 V. If the circuit design requires headroom above 45 V or includes transient voltage spikes, the reduced rating may compromise reliability. Circuit voltage analysis is required to determine compatibility.

Q: Are BC817W,115 and BC817W,135 interchangeable?

A: Yes. Both parts are manufactured by Nexperia USA Inc. with identical electrical specifications. The difference is packaging format: BC817W,115 is supplied in Cut Tape (CT) & Digi-Reel format, while BC817W,135 is supplied in Tape & Reel (TR) format. Both include AEC-Q101 automotive qualification.

Q: Why does BC817-25W RFG show higher DC current gain (160 vs. 100)?

A: DC current gain variation is a normal characteristic within the BC817 family. The BC817-25W RFG variant from Taiwan Semiconductor Corporation is specified with minimum hFE of 160 at 100 mA collector current and 1 V Vce, compared to 100 for other BC817 variants. This higher gain may affect circuit biasing and should be evaluated in the specific application context.

Q: Is PMSTA05,115 suitable for applications requiring 60 V rating?

A: PMSTA05,115 maintains the 60 V breakdown voltage rating and identical saturation voltage characteristics (250 mV @ 10mA, 100mA). However, the reduced DC current gain (50 vs. 100) requires circuit re-evaluation. This part is recommended for applications where the lower gain is compatible with existing biasing networks and where automotive-grade qualification (AEC-Q101) is required.

Q: What is the significance of BC817K25WH6327XTSA1 being designated Last Time Buy?

A: Last Time Buy status indicates that Infineon Technologies has announced end-of-life for this component. While currently available, future procurement may be limited. This part should be selected only if its enhanced specifications (170 MHz transition frequency, 250 mW power dissipation) are required and long-term availability constraints are acceptable.

Q: Are all substitute parts available in SOT-323 packaging?

A: Yes. All recommended substitute parts are supplied in SOT-323 (SC-70) surface mount packaging, maintaining mechanical compatibility with the MMSTA05-7 footprint and assembly process.

Q: What is the moisture sensitivity level for all substitute parts?

A: All substitute parts carry MSL 1 (Unlimited) moisture sensitivity rating, matching the MMSTA05-7 specification. This indicates no moisture sensitivity precautions are required during storage or handling.

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