MMBTA56-TP-HF Equivalent & Substitute Parts

Part Overview

The MMBTA56-TP-HF is a PNP bipolar junction transistor manufactured by Micro Commercial Co, designed for interface applications in surface mount configurations. This component operates at 80 V collector-emitter breakdown voltage with a maximum collector current of 500 mA and transition frequency of 50 MHz. The device is packaged in SOT-23 (TO-236-3) format with a maximum power dissipation of 225 mW and operates across a temperature range of -55°C to 150°C.

The MMBTA56-TP-HF maintains active product status with 653 pieces in current inventory. Equivalent and substitute parts are identified to provide design flexibility, accommodate supply chain variations, and support applications requiring alternative manufacturer sources or enhanced performance specifications.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	500	mA
Voltage - Collector Emitter Breakdown (Max)	80	V
Vce Saturation (Max) @ Ib, Ic	250 mV @ 10 mA, 100 mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) Min @ Ic, Vce	100 @ 100 mA, 1 V	—
Power - Max	225	mW
Frequency - Transition	50	MHz
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—

Substitute Part Grouping Explanation

Substitution of the MMBTA56-TP-HF is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Transistor type must be PNP
Collector current rating must equal or exceed 500 mA
Collector-emitter breakdown voltage must equal or exceed 80 V
Vce saturation characteristics must support the application's switching requirements
DC current gain (hFE) must meet or exceed 100 at specified test conditions
Maximum power dissipation must support the thermal requirements of the application
Transition frequency must support the circuit's operating frequency

Mechanical Compatibility Criteria:

Package must be SOT-23-3 (TO-236-3) or equivalent surface mount format
Mounting type must be surface mount
Pin configuration must be compatible with existing PCB layouts

Substitute parts are classified into two categories:

Upgrade Substitutes: Parts that maintain identical electrical specifications while offering enhanced features such as automotive-grade qualification (AEC-Q101), improved compliance certifications, or higher inventory availability.

Similar Substitutes: Parts that meet core electrical requirements but may exhibit variations in secondary parameters such as transition frequency, power dissipation, or saturation voltage characteristics. These parts remain functionally compatible within the specified electrical envelope.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Vce Sat (Max) mV	hFE (Min)	Power (Max) mW	Frequency MHz	Temp Range °C	Package	Product Status
MMBTA56-TP-HF	Micro Commercial Co	500	80	250	100	225	50	-55 to 150	SOT-23	Active
SMMBTA56LT1G	onsemi	500	80	250	100	225	50	-55 to 150	SOT-23-3	Active
SMMBTA56LT3G	onsemi	500	80	250	100	225	50	-55 to 150	SOT-23-3	Active
2SB1198KT146Q	Rohm Semiconductor	500	80	500	120	200	180	-55 to 150	SMT3	Active
2SB1198KT146R	Rohm Semiconductor	500	80	500	180	200	180	-55 to 150	SMT3	Active
CMPT8599 TR PBFREE	Central Semiconductor Corp	500	80	300	100	350	150	-65 to 150	SOT-23	Active
PMBTA56,235	Nexperia USA Inc.	500	80	250	100	250	50	-55 to 150	TO-236AB	Active
SMBTA56E6433HTMA1	Infineon Technologies	500	80	250	100	330	100	-55 to 150	PG-SOT23	Last Time Buy

Engineering Selection Recommendations

Upgrade Substitutes (Direct Replacement):

The SMMBTA56LT1G and SMMBTA56LT3G manufactured by onsemi provide direct electrical equivalence to the MMBTA56-TP-HF with identical specifications across all critical parameters. Both parts carry AEC-Q101 automotive qualification and ROHS3 compliance. SMMBTA56LT1G maintains higher inventory availability (18,145 pieces) compared to SMMBTA56LT3G (2,910 pieces). Both are supplied in Tape & Reel packaging with SOT-23-3 (TO-236) configuration and unlimited moisture sensitivity level (MSL 1).

Similar Substitutes (Functional Compatibility):

The 2SB1198KT146Q and 2SB1198KT146R manufactured by Rohm Semiconductor meet core electrical requirements with identical collector current and breakdown voltage ratings. These parts exhibit higher transition frequency (180 MHz versus 50 MHz) and reduced maximum power dissipation (200 mW versus 225 mW). Vce saturation is higher at 500 mV compared to 250 mV. The 2SB1198KT146R variant provides higher DC current gain (180 versus 100). Inventory availability is substantial (108,400 and 1,000,100 pieces respectively). Both are supplied in Cut Tape & Digi-Reel packaging with SMT3 package format.

The CMPT8599 TR PBFREE manufactured by Central Semiconductor Corp provides enhanced power dissipation capability (350 mW versus 225 mW) and higher transition frequency (150 MHz). Vce saturation is 300 mV. Operating temperature range extends to -65°C. This part is suitable for applications requiring improved thermal performance.

The PMBTA56,235 manufactured by Nexperia USA Inc. provides electrical equivalence with marginally higher power dissipation (250 mW). This part carries AEC-Q101 automotive qualification and is supplied in TO-236AB package format with Tape & Reel packaging.

The SMBTA56E6433HTMA1 manufactured by Infineon Technologies carries Last Time Buy status and should not be selected for new designs. This part exhibits higher transition frequency (100 MHz) and enhanced power dissipation (330 mW) but is subject to end-of-life discontinuation.

Selection Criteria:

For applications requiring direct replacement with enhanced automotive qualification, select SMMBTA56LT1G or SMMBTA56LT3G. For applications requiring higher transition frequency or improved thermal performance, select 2SB1198KT146Q, 2SB1198KT146R, or CMPT8599 TR PBFREE. For applications requiring automotive-grade qualification with alternative manufacturer sourcing, select PMBTA56,235. Avoid SMBTA56E6433HTMA1 due to Last Time Buy status.

Frequently Asked Questions (FAQ)

Q: Can SMMBTA56LT1G directly replace MMBTA56-TP-HF without circuit modification?

A: Yes. SMMBTA56LT1G provides identical electrical specifications across all critical parameters including collector current, breakdown voltage, saturation voltage, current gain, power dissipation, and transition frequency. Both parts are packaged in SOT-23-3 format with compatible pin configurations. No circuit modification is required.

Q: What is the difference between SMMBTA56LT1G and SMMBTA56LT3G?

A: Both parts provide identical electrical specifications and packaging. The primary difference is inventory availability, with SMMBTA56LT1G maintaining higher stock levels (18,145 pieces versus 2,910 pieces). Both carry AEC-Q101 automotive qualification and ROHS3 compliance.

Q: Can 2SB1198KT146Q be used as a direct replacement?

A: 2SB1198KT146Q meets core electrical requirements but exhibits differences in secondary parameters. Transition frequency is higher (180 MHz versus 50 MHz), maximum power dissipation is lower (200 mW versus 225 mW), and Vce saturation is higher (500 mV versus 250 mV). The part is functionally compatible but may require circuit evaluation for applications sensitive to saturation voltage or power dissipation characteristics.

Q: What is the significance of the SMT3 package used by Rohm parts versus SOT-23 used by other manufacturers?

A: SMT3 and SOT-23 are equivalent surface mount packages with identical pin configurations and mechanical dimensions. Both are recognized as TO-236-3 and SC-59 variants. Parts in either package format are mechanically interchangeable on standard PCB layouts.

Q: Why does CMPT8599 TR PBFREE have higher power dissipation than MMBTA56-TP-HF?

A: CMPT8599 TR PBFREE is rated for 350 mW maximum power dissipation compared to 225 mW for MMBTA56-TP-HF. This represents an enhanced thermal capability of the device and does not indicate a performance deficiency in the MMBTA56-TP-HF. The higher rating provides additional design margin for applications with elevated power requirements.

Q: Is SMBTA56E6433HTMA1 suitable for new product designs?

A: No. SMBTA56E6433HTMA1 carries Last Time Buy status, indicating manufacturer discontinuation. This part should not be selected for new designs. Alternative parts such as SMMBTA56LT1G or PMBTA56,235 should be used instead.

Q: What compliance certifications are relevant for automotive applications?

A: SMMBTA56LT1G, SMMBTA56LT3G, and PMBTA56,235 carry AEC-Q101 automotive qualification. All substitute parts listed maintain ROHS3 compliance and REACH Unaffected status. Parts with automotive qualification are suitable for automotive-grade applications.

Q: Can parts with different transition frequencies be interchanged?

A: Transition frequency differences do not prevent functional interchangeability in most applications. However, circuits operating at frequencies approaching the device transition frequency should be evaluated to ensure adequate performance margin. The 2SB1198KT146Q and 2SB1198KT146R with 180 MHz transition frequency provide enhanced high-frequency performance compared to the 50 MHz rating of MMBTA56-TP-HF.

Q: What is the impact of Vce saturation voltage differences on circuit operation?

A: Vce saturation voltage affects the voltage drop across the transistor in saturation mode. MMBTA56-TP-HF, SMMBTA56LT1G, SMMBTA56LT3G, and PMBTA56,235 specify 250 mV saturation voltage. The 2SB1198KT146Q and 2SB1198KT146R specify 500 mV, and CMPT8599 TR PBFREE specifies 300 mV. Applications sensitive to saturation voltage drop should verify compatibility with the selected substitute part.

Q: Are all listed parts available in Tape & Reel packaging?

A: SMMBTA56LT1G, SMMBTA56LT3G, CMPT8599 TR PBFREE, PMBTA56,235, and SMBTA56E6433HTMA1 are supplied in Tape & Reel packaging. The 2SB1198KT146Q and 2SB1198KT146R are supplied in Cut Tape & Digi-Reel packaging. Packaging format should be verified against procurement requirements.

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