MMSTA56-7-F Equivalent & Substitute Parts

Part Overview

The MMSTA56-7-F is a PNP bipolar junction transistor manufactured by Diodes Incorporated, designed for general-purpose switching and amplification applications. This surface mount device operates at 80 V collector-emitter breakdown voltage with a maximum collector current of 500 mA and is housed in the SOT-323 package. The part is currently in active production status with 24,263 units in stock. Equivalent and substitute parts are identified to provide design flexibility, accommodate supply chain variations, and support alternative packaging requirements while maintaining electrical and mechanical compatibility within specified parameters.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Max)	500	mA
Collector-Emitter Breakdown Voltage (Max)	80	V
Vce Saturation (Max)	250	mV @ 10mA, 100mA
DC Current Gain (hFE Min)	100	@ 100mA, 1V
Power Dissipation (Max)	200	mW
Transition Frequency	50	MHz
Operating Temperature Range	-55 to 150	°C
Package Type	SOT-323 (SC-70)	Surface Mount
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the MMSTA56-7-F is determined by electrical parameter equivalence and mechanical compatibility. All substitute parts must satisfy the following criteria:

Electrical Parameters (Required Match):

Transistor type: PNP
Collector current (Ic Max): 500 mA
Collector-emitter breakdown voltage (Vceo Max): 80 V
Vce saturation: 250 mV @ 10mA, 100mA
DC current gain (hFE Min): 100 @ 100mA, 1V
Transition frequency: 50 MHz
Operating temperature range: -55°C to 150°C

Mechanical Parameters (Required Match):

Mounting type: Surface mount
Package compatibility: SOT-323, SC-70, TO-236-3, or equivalent footprints

Compliance Parameters:

RoHS3 compliance
Moisture sensitivity level: 1 (Unlimited)

Substitute parts are grouped into three categories based on their relationship to the main part: direct manufacturer equivalents (same electrical and mechanical specifications), parametric equivalents (identical electrical performance with alternative packaging), and manufacturer-recommended alternatives (automotive-grade variants with enhanced specifications).

Parameter Comparison

Parameter	MMSTA56-7-F (Diodes)	MMBTA56WT1G (onsemi)	SMMBTA56WT1G (onsemi)	MMBTA56LT1G (onsemi)	PMBTA56,215 (Nexperia)	PMBTA56,235 (Nexperia)	PMSTA56,115 (Nexperia)
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP	PNP
Ic (Max)	500 mA	500 mA	500 mA	500 mA	500 mA	500 mA	500 mA
Vceo (Max)	80 V	80 V	80 V	80 V	80 V	80 V	80 V
Vce Saturation (Max)	250 mV	250 mV	250 mV	250 mV	250 mV	250 mV	250 mV
hFE (Min)	100	100	100	100	100	100	100
Power (Max)	200 mW	150 mW	150 mW	225 mW	250 mW	250 mW	200 mW
Frequency (Transition)	50 MHz	50 MHz	50 MHz	50 MHz	50 MHz	50 MHz	50 MHz
Operating Temperature	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	to 150°C	to 150°C	to 150°C
Package	SOT-323	SC-70-3	SC-70-3	SOT-23-3	TO-236AB	TO-236AB	SOT-323
RoHS Status	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3
Automotive Grade	—	—	—	—	AEC-Q101	AEC-Q101	AEC-Q101

Engineering Selection Recommendations

Direct Electrical Equivalents (SOT-323 Package): PMSTA56,115 (Nexperia) is a parametric equivalent with identical electrical specifications and SOT-323 packaging. This part carries automotive-grade AEC-Q101 qualification and is suitable for applications requiring enhanced reliability standards. It is available in 4,400 units in stock.

Alternative Packaging Options (SC-70-3 / SOT-23-3): MMBTA56WT1G and SMMBTA56WT1G (onsemi) provide SC-70-3 packaging with 150 mW power rating. SMMBTA56WT1G offers significantly higher inventory availability (230,100 units) compared to MMBTA56WT1G (2,212 units). MMBTA56LT1G (onsemi) provides SOT-23-3 packaging with 225 mW power rating and 416,100 units in stock, offering enhanced thermal performance for power-sensitive applications.

Automotive-Grade Alternatives (TO-236AB Package): PMBTA56,215 and PMBTA56,235 (Nexperia) are manufacturer-recommended alternatives with TO-236AB packaging, 250 mW power rating, and AEC-Q101 automotive qualification. These parts are suitable for automotive and industrial applications requiring enhanced reliability. PMBTA56,215 is available in 2,348 units; PMBTA56,235 is available in 8,661 units.

Selection Criteria:

For direct replacement with identical packaging: PMSTA56,115
For high-volume applications with extended inventory: SMMBTA56WT1G
For automotive applications: PMBTA56,215 or PMBTA56,235
For enhanced thermal performance: MMBTA56LT1G

All substitute parts maintain RoHS3 compliance, unlimited moisture sensitivity level (MSL 1), and equivalent electrical performance within the specified operating parameters.

Frequently Asked Questions (FAQ)

Q: Can PMSTA56,115 directly replace MMSTA56-7-F in existing designs? A: Yes. PMSTA56,115 is a parametric equivalent with identical electrical specifications (500 mA, 80 V, 50 MHz, 200 mW) and SOT-323 packaging. Both parts are pin-compatible and functionally interchangeable. PMSTA56,115 includes automotive-grade AEC-Q101 qualification, providing enhanced reliability for critical applications.

Q: What is the difference between SC-70-3 and SOT-323 packaging? A: SC-70-3 and SOT-323 are equivalent package designations for the same three-lead surface mount form factor. Both provide identical footprints and pin configurations. MMBTA56WT1G and SMMBTA56WT1G use SC-70-3 designation; MMSTA56-7-F and PMSTA56,115 use SOT-323 designation. These are mechanically and electrically interchangeable.

Q: Why do some substitute parts have higher power ratings (225 mW or 250 mW) than the original (200 mW)? A: Higher power ratings indicate enhanced thermal performance and design margin. MMBTA56LT1G (225 mW, SOT-23-3) and PMBTA56,215/PMBTA56,235 (250 mW, TO-236AB) provide additional thermal headroom for applications operating near maximum power dissipation limits. These parts are suitable for designs requiring improved thermal stability without circuit modification.

Q: Are PMBTA56,215 and PMBTA56,235 interchangeable? A: Yes. Both parts are electrically identical with 80 V, 500 mA, 50 MHz, and 250 mW specifications. The primary difference is collector cutoff current (ICBO): PMBTA56,215 specifies 50 nA; PMBTA56,235 specifies 500 nA. Both meet the 100 nA maximum requirement of the original MMSTA56-7-F. Selection depends on leakage current requirements for specific applications.

Q: What inventory considerations apply when selecting substitutes? A: SMMBTA56WT1G offers the highest inventory availability (230,100 units), followed by MMBTA56LT1G (416,100 units). MMSTA56-7-F has 24,263 units in stock. For supply chain continuity, SMMBTA56WT1G and MMBTA56LT1G provide extended availability. PMBTA56,215 and PMBTA56,235 have lower inventory (2,348 and 8,661 units respectively) and are suitable for automotive applications requiring AEC-Q101 qualification.

Q: Can I use TO-236AB packaged parts (PMBTA56,215/235) as direct replacements for SOT-323 packaged parts? A: No. TO-236AB and SOT-323 have different physical footprints and pin layouts. TO-236AB is larger than SOT-323. PCB layout modification is required for substitution. However, electrical performance is equivalent. Use TO-236AB alternatives only when PCB redesign is feasible or when automotive-grade qualification is required.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts (MMBTA56WT1G, SMMBTA56WT1G, MMBTA56LT1G, PMBTA56,215, PMBTA56,235, PMSTA56,115) are ROHS3 compliant with unlimited moisture sensitivity level (MSL 1). All parts are REACH unaffected and carry EAR99 export classification.

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