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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Diodes Incorporated MMBTA56-7-F

Name: MMBTA56-7-F
Brand: Diodes Incorporated
SKU: MMBTA56-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMBTA56-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: MMBTA56-7-F.pdf

Description:: TRANS PNP 80V 0.5A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MMBTA56-7-F from Diodes Incorporated is a 80V PNP medium-power bipolar junction transistor in SOT23 package, rated for -500mA continuous collector current and 350mW power dissipation at 25°C ambient. It delivers DC current gain (h_FE) ≥100 at -10mA/-1.0V, V_CE(sat) ≤ -0.25V at -100mA/-10mA drive, and f_T ≥50MHz - used in low-voltage switching and signal amplification stages of industrial control interfaces.

For engineers reviewing the MMBTA56-7-F datasheet, MMBTA56-7-F pinout, MMBTA56-7-F application, or MMBTA56-7-F equivalent, key selection criteria include its -80V V_CEO rating, SOT23 thermal resistance (R_θJA = 357°C/W on 15mm×15mm copper), ESD HBM rating of 4kV, complementary NPN pairing with MMBTA06, and automotive-grade variant (MMBTA56Q) availability.

Technical Context

This PNP BJT operates in active or saturation mode for linear amplification and hard-switching applications. Its epitaxial planar die construction ensures stable gain across temperature (-55°C to +150°C), while the -4.0V V_EBO and -100nA I_CEX support reliable turn-off in bias-sensitive circuits.

The device is optimized for low-power analog and digital interface functions where compact size, lead-free compliance, and predictable saturation behavior are required - not intended for high-frequency RF or high-current power conversion.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-80V - supports operation in 48V industrial bus and 24V control logic rails without breakdown
I_C (cont.)	-500mA - drives small relays, LED arrays, or logic-level translators directly
P_D	350mW - enables use on standard FR4 PCBs with 15mm×15mm 1oz copper without forced cooling
h_FE	≥100 @ -10mA/-1.0V - ensures sufficient current gain for base-driven switching with minimal drive overhead
V_CE(sat)	≤ -0.25V @ -100mA/-10mA - limits conduction loss to <25mW in saturated switch mode
f_T	≥50MHz - supports audio-frequency amplification and fast digital edge switching up to ~5MHz

Pinout & Package

SOT23-3 plastic surface-mount package with matte tin-plated leads; moisture sensitivity level 1 per J-STD-020; weight ≈0.008g.

Pin/Terminal	Circuit Role	Design Meaning
Emitter (E)	Current source terminal for PNP operation	Connected to higher potential rail; defines reference for base bias and collector load placement
Base (B)	Control input for minority-carrier injection	Requires negative voltage relative to emitter to forward-bias BE junction and enable conduction
Collector (C)	Current sink terminal	Typically tied to load and ground-return path; voltage swing limited by -80V V_CEO rating

Key Features

Feature	Design Value
Epitaxial planar die construction	Ensures consistent h_FE distribution and reduced parameter drift over temperature and lifetime
Lead-free & RoHS 3 compliant	Meets EU Directive 2015/863/EU with <900ppm Br/Cl and <1000ppm Sb - suitable for consumer and industrial end-equipment
4kV HBM ESD rating	Provides robustness during board assembly and handling without requiring additional protection circuitry
Complementary NPN pairing	Direct functional match with MMBTA06 for push-pull, differential, or level-shifting topologies

Applications

Industrial Sensor Interface

LED Driver Stage

Use Scenario: Amplifying low-level output from thermistor or RTD bridge circuits into ADC-input range.

IC Role / Device Role / Timing Role: PNP common-emitter amplifier with fixed bias network providing 10–20× voltage gain.

Use Value: Stable h_FE ≥100 and low V_CE(sat) ensure accurate signal translation without loading sensor elements.

Use Scenario: Switching 20–100mA LED strings in programmable signage or status indicators.

IC Role / Device Role / Timing Role: Low-side or high-side saturated switch controlled by microcontroller GPIO.

Use Value: -0.25V V_CE(sat) minimizes power loss and self-heating, enabling reliable operation at ambient up to +85°C.

Logic-Level Translator

Relay Driver Interface

Use Scenario: Converting 3.3V MCU outputs to 5V/12V logic-compatible signals for legacy peripherals.

IC Role / Device Role / Timing Role: Inverting level shifter using emitter-follower or common-base configuration.

Use Value: -80V V_CEO and -4.0V V_EBO allow safe operation across multiple supply domains without clamping diodes.

Use Scenario: Driving 12V/24V coil relays in PLC I/O modules or HVAC controllers.

IC Role / Device Role / Timing Role: Medium-power switch interfacing between microcontroller and relay coil with flyback protection.

Use Value: 350mW power rating and 357°C/W R_θJA permit direct PCB mounting without heatsinking in intermittent-duty cycles.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP medium-power transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
PN2907A	TO-92 package; lower f_T (≈200kHz); V_CEO = -60V	Limited to DC/low-frequency switching; unsuitable for >1MHz signal paths	Select when through-hole mounting or legacy footprint compatibility is required
BC807-40	SOT23 package; identical pinout; V_CEO = -45V; h_FE = 250–630	Lower voltage rating restricts use in 48V systems; higher gain reduces base drive margin sensitivity	Choose for higher-gain, cost-sensitive designs where -45V rating suffices

Compared with PN2907A and BC807-40, MMBTA56-7-F offers superior voltage capability (-80V), tighter thermal resistance control (357°C/W), and guaranteed 50MHz f_T, making it optimal for compact, mixed-signal industrial interfaces requiring both robustness and bandwidth.

Availability

MMBTA56-7-F is available at Aetrix Electronics and suitable for industrial sensor interfaces, LED driver stages, logic-level translators, and relay driver interfaces requiring stable component supply across production lifecycles.

Supply support for MMBTA56-7-F includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

The MMBTA56 belongs to Diodes' general-purpose bipolar transistor product line, engineered for cost-effective, reliable switching and amplification in space-constrained industrial, computing, and consumer applications.

FAQ

What is the maximum operating temperature for MMBTA56-7-F?

The MMBTA56-7-F has an operating junction temperature range of -55°C to +150°C. Its thermal resistance (R_θJA = 357°C/W on 15mm×15mm copper) means it can sustain full 350mW dissipation only below +85°C ambient - derating is required above that point per Figure 1 in DS30054 Rev. 14-2.

Is MMBTA56-7-F pin-compatible with MMBTA55-7-F?

Yes - both share identical SOT23-3 packaging and pinout (Emitter-Base-Collector). However, MMBTA55 is rated for -60V V_CEO/V_CBO, while MMBTA56 supports -80V. Substitution is electrically safe only if system voltage remains ≤60V; otherwise, MMBTA56 provides necessary margin.

Does MMBTA56-7-F require external ESD protection in typical PCB layouts?

No - with a 4kV HBM ESD rating (JEDEC Class 3A), MMBTA56-7-F withstands standard handling and assembly stresses. External protection is unnecessary unless exposed to >4kV system-level transients (e.g., industrial field wiring), where TVS diodes remain recommended per IEC 61000-4-2.

Can MMBTA56-7-F be used in linear amplifier configurations?

Yes - its h_FE ≥100 and f_T ≥50MHz support Class-A and Class-AB audio preamplifier stages up to ~5MHz. Designers must ensure stable biasing (e.g., emitter degeneration resistor), limit power dissipation per derating curve, and avoid operation near V_CEO limits to prevent second breakdown.

MMBTA56-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 500 mA

Voltage - Collector Emitter Breakdown (Max):: 80 V

Vce Saturation (Max) @ Ib, Ic:: 250mV @ 10mA, 100mA

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 100mA, 1V

Power - Max:: 300 mW

Frequency - Transition:: 50MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

MMBTA56-7-F FAQ

1.How can I place an order for MMBTA56-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBTA56-7-F on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MMBTA56-7-F reliable?

The price and inventory of MMBTA56-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBTA56-7-F is usually 5 days.

3.What payment methods are accepted for MMBTA56-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBTA56-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBTA56-7-F?

MMBTA56-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBTA56-7-F order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MMBTA56-7-F?

For technical support, including MMBTA56-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBTA56-7-F requirements.

6.How does Aetrix verify that MMBTA56-7-F is sourced from the original manufacturer or authorized distributors?

All MMBTA56-7-F products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MMBTA56-7-F meets industry standards.

7.What is the process for return or replacement of MMBTA56-7-F?

All MMBTA56-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBTA56-7-F, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MMBTA56-7-F part is unused and in its original packaging.

Return procedure for MMBTA56-7-F:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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