MMSTA06-7 NPN Bipolar Junction Transistor Equivalent & Substitute Parts

Part Overview

The MMSTA06-7 is an NPN bipolar junction transistor manufactured by Diodes Incorporated, designed for general-purpose switching and amplification applications. This device features an 80 V collector-emitter breakdown voltage, 500 mA maximum collector current, and 200 mW power dissipation in a surface mount SOT-323 package. The MMSTA06-7 is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and production requirements.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the MMSTA06-7 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Transistor type: NPN
Collector-emitter breakdown voltage: 80 V (maximum)
Collector current rating: 500 mA (maximum)
Transition frequency: 100 MHz (minimum)
DC current gain (hFE): 100 or greater at specified conditions
Vce saturation: 250 mV maximum at specified bias conditions
Package compatibility: SOT-323 or equivalent surface mount form factor
Operating temperature range: -55°C to 150°C minimum

Substitute parts are grouped into two categories based on parametric equivalence and product status:

Category 1: Parametric Equivalents (Identical Electrical Specifications) Parts meeting all electrical parameters with identical or superior power ratings and active product status.

Category 2: Manufacturer-Recommended Alternatives (Functional Equivalents with Noted Variations) Parts meeting core electrical specifications with documented variations in power dissipation, package designation, or operating temperature range, recommended by original equipment manufacturers.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Power mW	hFE (Min)	Freq MHz	Package	Status	RoHS
MMSTA06-7	Diodes Inc.	500	80	200	100	100	SOT-323	Discontinued	Non-compliant
MMSTA06-7-F	Diodes Inc.	500	80	200	100	100	SOT-323	Active	ROHS3
MMSTA06Q-7-F	Diodes Inc.	500	80	200	100	100	SOT-323	Active	ROHS3
PMSTA06,115	Nexperia USA Inc.	500	80	200	50	100	SOT-323	Active	ROHS3
MMBTA06WT1G	onsemi	500	80	150	100	100	SOT-323	Active	ROHS3
SMMBTA06WT3G	onsemi	500	80	150	100	100	SOT-323	Active	ROHS3
CMPTA06 TR PBFREE	Central Semiconductor	500	80	350	100	100	SOT-23	Active	ROHS3

Engineering Selection Recommendations

Primary Recommendation: MMSTA06-7-F

The MMSTA06-7-F is the direct parametric equivalent of the discontinued MMSTA06-7. This part is manufactured by Diodes Incorporated under the same base product number (MMSTA06) and maintains identical electrical specifications across all critical parameters. The MMSTA06-7-F carries active product status with ROHS3 compliance and is available in high inventory quantities (22,351 pieces). This part requires no design modification and provides the most direct replacement path.

Secondary Recommendation: MMSTA06Q-7-F

The MMSTA06Q-7-F offers identical parametric equivalence to the MMSTA06-7-F with the addition of automotive-grade qualification (AEC-Q101) and Cut Tape & Digi-Reel packaging. This variant is suitable for applications requiring automotive-grade components and is available in active status with ROHS3 compliance.

Alternative Recommendation: PMSTA06,115

The PMSTA06,115 manufactured by Nexperia USA Inc. meets all core electrical specifications with automotive-grade qualification (AEC-Q101). This part exhibits a lower DC current gain minimum (50 versus 100 at specified conditions) and is available in active status with ROHS3 compliance. This part is suitable for applications where the lower hFE specification does not impact circuit performance.

Alternative Recommendation: MMBTA06WT1G and SMMBTA06WT3G

Both onsemi parts (MMBTA06WT1G and SMMBTA06WT3G) maintain electrical equivalence across voltage, current, and frequency specifications. These parts feature reduced power dissipation (150 mW versus 200 mW) and are available in active status with ROHS3 compliance. The MMBTA06WT1G is supplied in Cut Tape & Digi-Reel packaging, while the SMMBTA06WT3G is supplied in Tape & Reel packaging.

Alternative Recommendation: CMPTA06 TR PBFREE

The CMPTA06 TR PBFREE manufactured by Central Semiconductor Corp meets all core electrical specifications with enhanced power dissipation capability (350 mW). This part uses the SOT-23 package instead of SOT-323, requiring PCB layout modification. The part is available in active status with ROHS3 compliance and extended operating temperature range (-65°C to 175°C).

Frequently Asked Questions (FAQ)

Q: Can the MMSTA06-7 be directly replaced with MMSTA06-7-F without design changes?

A: Yes. The MMSTA06-7-F is a parametric equivalent with identical electrical specifications and the same SOT-323 package. No design modification is required. The primary difference is product status (active versus discontinued) and RoHS compliance level.

Q: What is the difference between MMSTA06-7-F and MMSTA06Q-7-F?

A: Both parts are parametric equivalents with identical electrical specifications. The MMSTA06Q-7-F carries automotive-grade qualification (AEC-Q101) and is supplied in Cut Tape & Digi-Reel packaging, while the MMSTA06-7-F is supplied in Tape & Reel packaging. Selection depends on application requirements and packaging preferences.

Q: Why do MMBTA06WT1G and SMMBTA06WT3G have lower power ratings (150 mW versus 200 mW)?

A: These onsemi parts maintain identical electrical performance across voltage, current, and frequency specifications. The lower power rating reflects the thermal design of the specific device variant. For applications operating within the 500 mA collector current and 80 V breakdown voltage limits, the reduced power rating does not impact functional equivalence.

Q: Can CMPTA06 TR PBFREE be used as a direct replacement?

A: The CMPTA06 TR PBFREE meets all core electrical specifications but uses the SOT-23 package instead of SOT-323. This requires PCB layout modification. The part offers enhanced power dissipation (350 mW) and extended operating temperature range (-65°C to 175°C). Use this part only if PCB redesign is acceptable.

Q: What does the DC current gain (hFE) difference mean for PMSTA06,115?

A: The PMSTA06,115 specifies a minimum hFE of 50 at 100 mA and 1 V, compared to 100 for the MMSTA06-7. This lower gain specification does not affect functional equivalence for switching applications. Verify circuit performance if the design relies on specific current gain values for amplification applications.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitute parts carry ROHS3 compliance. The original MMSTA06-7 is RoHS non-compliant. Substitution with any recommended part improves environmental compliance status.

Q: What packaging options are available for substitutes?

A: Most substitutes are available in SOT-323 (SC-70) surface mount packages matching the original part. The CMPTA06 TR PBFREE uses SOT-23 packaging. Packaging variants (Tape & Reel versus Cut Tape & Digi-Reel) are available across multiple manufacturers and do not affect electrical performance.

Q: Which substitute offers the best inventory availability?

A: The MMBTA06WT1G offers the highest inventory availability at 35,200 pieces. The MMSTA06-7-F offers 22,351 pieces. Both parts are suitable for high-volume production requirements.

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