MMBTA56LT1HTSA1 Equivalent & Substitute Parts

Part Overview

The MMBTA56LT1HTSA1 is a PNP bipolar junction transistor manufactured by Infineon Technologies in SOT-23-3 surface mount packaging. This device is rated for 80 V collector-emitter breakdown voltage and 500 mA maximum collector current, with a maximum power dissipation of 330 mW and 100 MHz transition frequency. The part is currently in Last Time Buy status, indicating discontinued production. Equivalent and substitute parts are necessary to maintain design continuity and ensure long-term component availability for production and field service applications.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Ic) Maximum	500	mA
Collector-Emitter Breakdown Voltage (Vceo)	80	V
Vce Saturation @ Ib, Ic	250 mV @ 10 mA, 100 mA	—
DC Current Gain (hFE) @ Ic, Vce	100 @ 100 mA, 1 V	—
Power Dissipation Maximum	330	mW
Transition Frequency (fT)	100	MHz
Operating Temperature Maximum	150	°C
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MMBTA56LT1HTSA1 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Direct Substitution:

Transistor Type: PNP
Collector Current (Ic) Maximum: 500 mA
Collector-Emitter Breakdown Voltage (Vceo): 80 V
Vce Saturation: 250 mV @ 10 mA, 100 mA
DC Current Gain (hFE): 100 @ 100 mA, 1 V
Package / Case: TO-236-3, SC-59, SOT-23-3
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Parameters Allowing Variation:

Power Dissipation Maximum: 225 mW to 330 mW
Transition Frequency (fT): 50 MHz to 100 MHz
Operating Temperature Range: -55°C to 150°C (minimum upper limit 150°C required)
Manufacturer and product status (Active or Last Time Buy)

Substitute parts are grouped into two categories:

Parametric Equivalents: Parts manufactured by Infineon Technologies with identical electrical specifications and Last Time Buy status (SMBTA56E6327HTSA1, SMBTA56E6433HTMA1).

Direct Substitutes: Parts from alternative manufacturers (Diodes Incorporated, Micro Commercial Co, onsemi, Nexperia USA Inc.) with matching or superior electrical ratings and active product status. These parts maintain the same base electrical performance while offering improved availability.

Limited Substitutes: BC807-40-7-F is listed as a manufacturer-recommended alternative but operates at reduced voltage rating (45 V vs. 80 V) and is included for reference only in applications where voltage margin permits.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vceo (Max) V	Power (Max) mW	fT MHz	hFE @ 100mA, 1V	Package	Status
MMBTA56LT1HTSA1	Infineon	500	80	330	100	100	SOT-23-3	Last Time Buy
SMBTA56E6327HTSA1	Infineon	500	80	330	100	100	SOT-23-3	Last Time Buy
SMBTA56E6433HTMA1	Infineon	500	80	330	100	100	SOT-23-3	Last Time Buy
MMBTA56-7-F	Diodes Inc.	500	80	300	50	100	SOT-23-3	Active
MMBTA56-TP	Micro Commercial Co	500	80	225	50	100	SOT-23-3	Active
MMBTA56LT1G	onsemi	500	80	225	50	100	SOT-23-3	Active
MMBTA56LT3G	onsemi	500	80	225	50	100	SOT-23-3	Active
PMBTA56,215	Nexperia USA Inc.	500	80	250	50	100	SOT-23-3	Active
SMMBTA56LT1G	onsemi	500	80	225	50	100	SOT-23-3	Active
SMMBTA56LT3G	onsemi	500	80	225	50	100	SOT-23-3	Active
BC807-40-7-F	Diodes Inc.	500	45	310	100	250	SOT-23-3	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs and Replacements):

MMBTA56LT1G and MMBTA56LT3G (onsemi) are the preferred substitutes. Both parts maintain full electrical compatibility with the MMBTA56LT1HTSA1, operate at identical voltage and current ratings, and carry Active product status with high inventory availability (416,100 and 1,900 units respectively). Both are ROHS3 compliant and MSL 1 rated. The onsemi parts support extended operating temperature range (-55°C to 150°C) compared to the Infineon part (0°C to 150°C implied). MMBTA56LT1G is supplied in Cut Tape & Digi-Reel packaging, while MMBTA56LT3G is supplied in Tape & Reel.

Secondary Substitutes (Alternative Sources):

MMBTA56-7-F (Diodes Incorporated) provides Active status with 36,400 units in stock and automotive-grade qualification (AEC-Q101). Power dissipation is reduced to 300 mW and transition frequency to 50 MHz, but these remain within acceptable margins for most applications. PMBTA56,215 (Nexperia USA Inc.) offers automotive qualification and 2,348 units in stock with 250 mW power rating and 50 MHz transition frequency.

Automotive-Grade Options:

SMMBTA56LT1G and SMMBTA56LT3G (onsemi) are automotive-qualified variants with AEC-Q101 certification. These parts are suitable for automotive and industrial applications requiring formal qualification documentation. Both maintain 80 V Vceo rating and 500 mA Ic rating with 225 mW power dissipation and 50 MHz transition frequency.

Parametric Equivalents (Same Manufacturer, Last Time Buy Status):

SMBTA56E6327HTSA1 and SMBTA56E6433HTMA1 (Infineon Technologies) are parametric equivalents with identical electrical specifications to the MMBTA56LT1HTSA1. Both carry Last Time Buy status and are suitable for direct replacement in existing designs. Inventory levels are 874 and 719 units respectively.

Limited Substitute (Voltage Derating Required):

BC807-40-7-F (Diodes Incorporated) operates at 45 V Vceo maximum, representing a 44% reduction from the 80 V rating of the MMBTA56LT1HTSA1. This part is included as a manufacturer-recommended alternative but is suitable only for applications where the circuit design permits operation at reduced voltage margins. The part offers higher transition frequency (100 MHz) and higher DC current gain (250 vs. 100), but these advantages do not offset the voltage limitation for general-purpose substitution.

Frequently Asked Questions (FAQ)

Q: Can MMBTA56LT1G directly replace MMBTA56LT1HTSA1 in existing designs?

A: Yes. MMBTA56LT1G maintains identical electrical specifications: 500 mA collector current, 80 V collector-emitter breakdown voltage, 100 minimum DC current gain at 100 mA and 1 V, and 250 mV saturation voltage at specified conditions. Both use SOT-23-3 surface mount packaging. The onsemi part is Active status with superior availability.

Q: What is the difference between MMBTA56LT1G and MMBTA56LT3G?

A: Both parts are manufactured by onsemi with identical electrical specifications. The primary difference is packaging: MMBTA56LT1G is supplied in Cut Tape & Digi-Reel format (416,100 units available), while MMBTA56LT3G is supplied in Tape & Reel format (1,900 units available). Selection depends on assembly equipment and procurement requirements.

Q: Why is BC807-40-7-F listed as a substitute if it has lower voltage rating?

A: BC807-40-7-F is listed as a manufacturer-recommended alternative in the original part data. However, the 45 V Vceo rating is 44% lower than the 80 V rating of MMBTA56LT1HTSA1. This part is suitable only for applications where circuit design permits reduced voltage margins. For general-purpose substitution, use MMBTA56LT1G or MMBTA56LT3G instead.

Q: Are automotive-qualified versions available?

A: Yes. SMMBTA56LT1G and SMMBTA56LT3G (onsemi) are automotive-grade variants with AEC-Q101 qualification. Both maintain 80 V Vceo and 500 mA Ic ratings. These parts are suitable for automotive and industrial applications requiring formal qualification documentation.

Q: What is the difference between Infineon parametric equivalents and onsemi direct substitutes?

A: Infineon parametric equivalents (SMBTA56E6327HTSA1, SMBTA56E6433HTMA1) carry Last Time Buy status and identical specifications to the original part. onsemi direct substitutes (MMBTA56LT1G, MMBTA56LT3G) carry Active status with higher inventory availability and extended temperature range support (-55°C to 150°C). For new designs and long-term supply, onsemi parts are preferred.

Q: Can parts with lower power dissipation ratings be used?

A: Parts with lower power dissipation ratings (225 mW vs. 330 mW) can be used if circuit design ensures actual power dissipation remains below the lower rating. Thermal analysis is required to confirm safe operation. MMBTA56-TP (225 mW) and onsemi variants (225 mW) are suitable for applications with confirmed lower power requirements.

Q: What is the significance of RoHS3 compliance and MSL 1 rating?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements for lead-free and restricted substance content. MSL 1 (Unlimited) rating indicates the part has unlimited shelf life and requires no special moisture control during storage or handling. All listed substitutes maintain these compliance levels.

Q: Are there differences in collector cutoff current (Icbo) between substitutes?

A: Yes. The main part and most substitutes specify 100 nA maximum Icbo. PMBTA56,215 (Nexperia) specifies 50 nA maximum, representing lower leakage current. This difference is negligible for most applications but may be relevant in high-impedance or precision analog circuits.

Q: What packaging options are available?

A: All substitutes use SOT-23-3 (TO-236-3, SC-59) surface mount packaging, maintaining mechanical compatibility. Packaging format varies: Cut Tape & Digi-Reel (MMBTA56-7-F, MMBTA56LT1G), Tape & Reel (MMBTA56LT3G, MMBTA56-TP, PMBTA56,215, SMMBTA56LT1G, SMMBTA56LT3G), or Digi-Reel (MMBTA56-7-F). Selection depends on assembly equipment and procurement volume requirements.

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