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

onsemi SMMBTA56WT3G

Name: SMMBTA56WT3G
Brand: onsemi
SKU: SMMBTA56WT3G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMMBTA56WT3G

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: SC-70, SOT-323

Datasheet:: SMMBTA56WT3G.pdf

Description:: TRANS PNP 80V 0.5A SC70-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SMMBTA56WT3G from onsemi is a PNP silicon small-signal transistor designed for general-purpose switching and amplification in low-power circuits, with −80 V V_CEO, −500 mA I_C, 460 mW power dissipation at T_A = 25°C, DC current gain (h_FE) ≥100 at −10 mA/−1.0 V, and f_T = 50 MHz - used in level-shifting, load switching, and discrete logic interface stages.

For engineers reviewing the SMMBTA56WT3G datasheet, pinout, applications, or equivalent options, key selection criteria include its SC-70 (SOT-323) package footprint, −80 V breakdown rating, AEC-Q101 qualification for automotive use, and verified PNP switching performance under −100 mA/−10 mA drive conditions.

Technical Context

This device operates as a discrete PNP bipolar junction transistor with fixed emitter-base and collector-emitter polarity, requiring negative bias on the base relative to the emitter to turn on. Its safe operating area is defined up to −500 mA and −80 V, with thermal resistance R_JA = 272°C/W on FR-5 board.

It delivers stable DC current gain across −10 mA to −100 mA collector currents and supports high-speed switching with t_r/t_f in the nanosecond range (typ. 3 ns rise time), enabled by low junction capacitance (C_ibo, C_obo < 10 pF at −5 V).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−80 V - supports rail-to-rail switching in −48 V or −24 V systems without breakdown
I_C (max)	−500 mA - drives medium-current loads such as LED arrays or relay coils
P_D (T_A=25°C)	460 mW - limits continuous operation to ≤−100 mA at full V_CE without heatsinking
h_FE	≥100 @ −10 mA/−1.0 V - ensures reliable saturation with modest base drive in digital switch designs
f_T	50 MHz - enables use in audio-frequency amplifiers and sub-MHz pulse shaping
V_CE(sat)	≤−0.25 V @ −100 mA/−10 mA - minimizes conduction loss in saturated-switch applications
V_BE(on)	≤−1.2 V @ −100 mA - defines minimum base-emitter drive voltage needed for full conduction

Pinout & Package

SC-70 (SOT-323) 3-pin surface-mount package with gull-wing leads, 1.3 mm × 1.7 mm body, 0.95 mm height, and Pb-free/RoHS-compliant construction.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal; negative voltage relative to emitter turns device ON
2	Emitter	Current source terminal; connected to higher potential (e.g., V_CC) in PNP switch configuration
3	Collector	Output terminal; sinks current to load when device is ON

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTOL, and ESD stress per JESD22 standards
Moisture Sensitivity Level 1	Unlimited floor life at ≤30°C/60% RH - no baking required before reflow
HBM ESD rating: 4 kV	Withstands electrostatic discharge events typical of manual handling and board assembly
Pb-free, Halogen-free/BFR-free	Complies with RoHS Directive 2011/65/EU and JEDEC JS709C material requirements

Applications

Automotive Door Module	Industrial PLC Input Stage
Use Scenario: Controlling window lift motor direction via H-bridge gate logic in door control units. IC Role / Device Role / Timing Role: Discrete PNP switch enabling high-side current sourcing for logic-level translation and driver enable signals. Use Value: −80 V V_CEO withstands load-dump transients; AEC-Q101 qualification ensures field reliability over 15-year vehicle lifetime.	Use Scenario: Isolating 24 V DC sensor inputs from microcontroller GPIO pins in programmable logic controllers. IC Role / Device Role / Timing Role: Level-shifting switch converting industrial 24 V signals to 3.3 V/5 V logic-compatible levels. Use Value: 460 mW power rating allows sustained 24 V/10 mA input conditioning without derating; SC-70 footprint saves PCB space in dense I/O modules.
Consumer Audio Amplifier Bias	Medical Infusion Pump Motor Driver
Use Scenario: Providing matched bias current in Class AB audio preamplifier output stages. IC Role / Device Role / Timing Role: Linear-mode current source setting quiescent current in complementary BJT pairs. Use Value: h_FE ≥100 ensures predictable bias stability across −25°C to +85°C ambient; low V_CE(sat) reduces idle power dissipation.	Use Scenario: Driving stepper motor phase enable lines in battery-powered infusion pumps requiring low standby current. IC Role / Device Role / Timing Role: Low-leakage PNP switch enabling/disabling motor windings with <100 nA I_CES. Use Value: I_CES ≤−0.1 μA at −60 V ensures negligible battery drain during sleep mode; SC-70 package supports compact, sterilizable PCB layouts.

Automotive Door Module

Industrial PLC Input Stage

Use Scenario: Controlling window lift motor direction via H-bridge gate logic in door control units.

IC Role / Device Role / Timing Role: Discrete PNP switch enabling high-side current sourcing for logic-level translation and driver enable signals.

Use Value: −80 V V_CEO withstands load-dump transients; AEC-Q101 qualification ensures field reliability over 15-year vehicle lifetime.

Use Scenario: Isolating 24 V DC sensor inputs from microcontroller GPIO pins in programmable logic controllers.

IC Role / Device Role / Timing Role: Level-shifting switch converting industrial 24 V signals to 3.3 V/5 V logic-compatible levels.

Use Value: 460 mW power rating allows sustained 24 V/10 mA input conditioning without derating; SC-70 footprint saves PCB space in dense I/O modules.

Consumer Audio Amplifier Bias

Medical Infusion Pump Motor Driver

Use Scenario: Providing matched bias current in Class AB audio preamplifier output stages.

IC Role / Device Role / Timing Role: Linear-mode current source setting quiescent current in complementary BJT pairs.

Use Value: h_FE ≥100 ensures predictable bias stability across −25°C to +85°C ambient; low V_CE(sat) reduces idle power dissipation.

Use Scenario: Driving stepper motor phase enable lines in battery-powered infusion pumps requiring low standby current.

IC Role / Device Role / Timing Role: Low-leakage PNP switch enabling/disabling motor windings with <100 nA I_CES.

Use Value: I_CES ≤−0.1 μA at −60 V ensures negligible battery drain during sleep mode; SC-70 package supports compact, sterilizable PCB layouts.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP small-signal transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBTA56WT1G	Identical electrical specs and SC-70 package; differs only in tape-and-reel quantity (3,000 vs. 10,000 units)	No functional difference; selected when smaller reel size aligns with production batch sizing	Preferred for prototyping or low-volume manufacturing runs
PN2907A	TO-92 package, lower f_T (≈200 kHz), higher V_CE(sat) (≤−0.5 V), same −60 V V_CEO	Not suitable for high-speed switching or space-constrained layouts due to through-hole form factor	Used where legacy through-hole assembly or higher power dissipation (625 mW) is required

Compared with MMBTA56WT1G and PN2907A, the SMMBTA56WT3G offers identical performance in a larger reel format optimized for high-volume SMT lines, while the PN2907A trades speed and miniaturization for legacy compatibility and higher thermal mass - making SMMBTA56WT3G optimal for modern automotive and industrial SMT designs demanding AEC-Q101 compliance and nanosecond switching.

Availability

SMMBTA56WT3G is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, and medical portable device power management requiring stable component supply, long-term lifecycle support, and AEC-Q101-qualified assurance.

Supply support for SMMBTA56WT3G 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The MMBTA56W/SMMBTA56W family was engineered for cost-sensitive, high-reliability PNP switching in automotive interior modules and industrial control interfaces - emphasizing AEC-Q101 qualification, moisture-insensitive packaging, and consistent h_FE across production lots.

FAQ

What is the maximum continuous collector current rating for SMMBTA56WT3G?

The SMMBTA56WT3G has a maximum continuous collector current (I_C) rating of −500 mA at T_A = 25°C. This rating assumes adequate PCB copper area for heat dissipation; derating is required above 25°C ambient, following the R_JA = 272°C/W thermal resistance curve. At 100°C junction temperature, usable I_C drops to approximately −300 mA under typical FR-5 board conditions.

Is SMMBTA56WT3G suitable for automotive applications?

Yes, the SMMBTA56WT3G is AEC-Q101 qualified and PPAP capable, with explicit validation for automotive use cases including door modules, lighting controls, and body electronics. Its S-prefix designation confirms compliance with automotive-specific site and change control requirements, and its moisture sensitivity level 1 eliminates bake steps prior to reflow soldering in high-volume automotive assembly lines.

What is the pin configuration of SMMBTA56WT3G in the SC-70 package?

The SMMBTA56WT3G uses the SC-70 (SOT-323) package with pin 1 = Base, pin 2 = Emitter, pin 3 = Collector - confirmed in the official onsemi mechanical drawing CASE 419 STYLE 3. This configuration matches standard PNP layout conventions and is compatible with automated pick-and-place feeders calibrated for SOT-323 footprints.

How does the DC current gain (h_FE) of SMMBTA56WT3G vary with collector current?

The SMMBTA56WT3G guarantees h_FE ≥100 at −10 mA I_C and −1.0 V V_CE. Per Figure 6 in the datasheet, h_FE peaks near −50 mA (≈200–250), then declines gradually to ~120 at −100 mA and remains >80 up to −500 mA. Designers should verify gain at target operating point using the published curves rather than relying solely on the minimum spec.

What is the typical switching speed performance of SMMBTA56WT3G?

The SMMBTA56WT3G achieves typical rise and fall times (t_r, t_f) of 3.0 ns under standardized test conditions (V_CC = −40 V, I_C/I_B = 10). This speed is enabled by its 50 MHz f_T and low junction capacitance (<10 pF), making it suitable for pulse-width modulation, digital logic interfacing, and fast load switching up to several hundred kHz without significant delay or overshoot.

SMMBTA56WT3G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: SC-70, SOT-323

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

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

Power - Max:: 150 mW

Frequency - Transition:: 50MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SC-70-3 (SOT323)

SMMBTA56WT3G FAQ

1.How can I place an order for SMMBTA56WT3G through Aetrix?

Please submit a Request for Quotation (RFQ) for SMMBTA56WT3G 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 SMMBTA56WT3G reliable?

The price and inventory of SMMBTA56WT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMMBTA56WT3G is usually 5 days.

3.What payment methods are accepted for SMMBTA56WT3G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMMBTA56WT3G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMMBTA56WT3G?

SMMBTA56WT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMMBTA56WT3G 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 SMMBTA56WT3G?

For technical support, including SMMBTA56WT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMMBTA56WT3G requirements.

6.How does Aetrix verify that SMMBTA56WT3G is sourced from the original manufacturer or authorized distributors?

All SMMBTA56WT3G 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 SMMBTA56WT3G meets industry standards.

7.What is the process for return or replacement of SMMBTA56WT3G?

All SMMBTA56WT3G units undergo pre-shipment inspection (PSI). If there is an issue with SMMBTA56WT3G, 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 SMMBTA56WT3G part is unused and in its original packaging.

Return procedure for SMMBTA56WT3G:

1.Submit a request within 90 days.

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

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