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

onsemi MMBT4401_D87Z

Name: MMBT4401_D87Z
Brand: onsemi
SKU: MMBT4401_D87Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMBT4401_D87Z

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: MMBT4401_D87Z.pdf

Description:: TRANS NPN 40V 0.6A SOT-23-3

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Product details

Overview

MMBT4401_D87Z from ON Semiconductor is an NPN general-purpose bipolar junction transistor (BJT) designed for medium-power amplification and switching applications with continuous collector current up to 600 mA, V_CEO = 40 V, and f_T = 250 MHz. It operates across –55°C to +150°C and is commonly used in low-voltage DC-DC converter control stages, LED driver switches, and signal buffering circuits.

For engineers reviewing the MMBT4401_D87Z datasheet, pinout, applications, or equivalent options, key selection criteria include its SOT-23 package thermal resistance (R_θJA = 357°C/W), h_FE range (40–300 at I_C = 1–500 mA), V_CE(sat) ≤ 0.75 V at 500 mA/50 mA drive, and guaranteed 6.5 pF C_cb at 5 V.

Technical Context

The MMBT4401_D87Z implements a planar epitaxial NPN structure optimized for fast switching (t_d = 15 ns, t_f = 30 ns) and stable DC gain across temperature. Its h_FE exhibits monotonic variation from 40 at 1 mA to 100 at 150 mA and drops to 40 again at 500 mA - indicating intentional gain compression for predictable saturation behavior.

It supports common-emitter configurations with V_BE(sat) = 0.75–1.20 V across 150–500 mA drive, and its C_eb = 30 pF at 0.5 V reverse bias enables predictable high-frequency input impedance modeling. The device is not rated for avalanche operation and requires external base current limiting in linear amplifier use.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum safe collector-emitter voltage before breakdown; sets upper rail limit in 24 V and 36 V switching designs.
I_C (continuous)	600 mA - Continuous collector current rating; defines maximum sustained load drive capability without derating.
f_T	250 MHz - Unity-gain bandwidth at I_C = 20 mA, V_CE = 10 V; confirms suitability for audio and low-MHz digital signal amplification.
h_FE	40–300 - DC current gain range across 1–500 mA; enables predictable base drive sizing for both switch and linear modes.
V_CE(sat)	0.40–0.75 V - Saturation voltage at I_C/I_B = 150 mA/15 mA and 500 mA/50 mA; directly determines conduction loss in switching applications.
R_θJA	357°C/W - Junction-to-ambient thermal resistance in SOT-23 on standard FR-4 PCB; mandates heatsinking or power derating above ~125°C ambient.
C_cb	6.5 pF - Collector-base capacitance at V_CB = 5 V; critical for Miller effect estimation in high-speed switch design.

Pinout & Package

MMBT4401_D87Z is housed in a JEDEC TO-236 (SOT-23) 3-lead surface-mount package with 1.30 mm × 2.92 mm footprint and 1.20 mm max height. Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector - confirmed per Figure 17 and marking "2X" orientation.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Emitter)	Current sink terminal	Reference node for base-emitter biasing; connects to ground or low-side return path in common-emitter switches.
Pin 2 (Base)	Control input	Receives current-limited drive to modulate collector current; requires series resistor to limit I_B per h_FE and V_BE(sat).
Pin 3 (Collector)	Current source terminal	Delivers switched load current; must be routed with adequate copper area to manage 357°C/W thermal rise under 350 mW dissipation.

Key Features

Feature	Design Value
High f_T / low C_cb ratio	250 MHz / 6.5 pF enables >10 MHz switching with minimal Miller distortion in gate-drive or pulse-amplifier roles.
Guaranteed h_FE spread	Min 40 at I_C = 500 mA ensures predictable base drive requirements even at full-rated current.
Low V_CE(sat) at high I_C	0.75 V at 500 mA/50 mA reduces conduction loss to <375 mW in saturated switch mode.
Extended temperature range	–55°C to +150°C operation supports industrial motor controls and automotive under-hood modules.
SOT-23 footprint compatibility	Standardized 3-pin layout allows drop-in replacement with MMBT3904, MMBT4403 (PNP complement), and other JEDEC TO-236 devices.

Applications

LED Driver Switch	DC-DC Converter Control
Use Scenario: Driving 350 mA white LEDs from 5 V or 12 V rails in portable lighting and signage. IC Role / Device Role / Timing Role: Low-side saturated switch controlling LED current path with PWM dimming. Use Value: V_CE(sat) ≤ 0.75 V minimizes power loss (<260 mW), while f_T = 250 MHz supports clean 1–5 kHz PWM edges.	Use Scenario: Active pull-down in synchronous buck converter gate drivers or feedback loop transistors. IC Role / Device Role / Timing Role: Fast-turnoff switch enabling precise dead-time control between high- and low-side FETs. Use Value: t_f = 30 ns and t_s = 225 ns allow sub-100 ns dead time implementation without shoot-through risk.
Signal Buffer Amplifier	Microcontroller I/O Expander
Use Scenario: Level-shifting and current boosting of 3.3 V MCU GPIO signals to drive 5 V logic or small relays. IC Role / Device Role / Timing Role: Common-emitter amplifier with fixed bias network providing gain and isolation. Use Value: h_FE ≥ 40 at 10 mA ensures reliable 1:10 current gain, while C_eb = 30 pF limits bandwidth to ~5 MHz - sufficient for UART and SPI.	Use Scenario: Adding discrete output capability to resource-constrained microcontrollers in HVAC or PLC I/O modules. IC Role / Device Role / Timing Role: General-purpose digital output stage switching 200–500 mA loads like solenoids or indicator lamps. Use Value: I_C = 600 mA rating and –55°C to +150°C range support long-term reliability in unregulated industrial environments.

LED Driver Switch

DC-DC Converter Control

Use Scenario: Driving 350 mA white LEDs from 5 V or 12 V rails in portable lighting and signage.

IC Role / Device Role / Timing Role: Low-side saturated switch controlling LED current path with PWM dimming.

Use Value: V_CE(sat) ≤ 0.75 V minimizes power loss (<260 mW), while f_T = 250 MHz supports clean 1–5 kHz PWM edges.

Use Scenario: Active pull-down in synchronous buck converter gate drivers or feedback loop transistors.

IC Role / Device Role / Timing Role: Fast-turnoff switch enabling precise dead-time control between high- and low-side FETs.

Use Value: t_f = 30 ns and t_s = 225 ns allow sub-100 ns dead time implementation without shoot-through risk.

Signal Buffer Amplifier

Microcontroller I/O Expander

Use Scenario: Level-shifting and current boosting of 3.3 V MCU GPIO signals to drive 5 V logic or small relays.

IC Role / Device Role / Timing Role: Common-emitter amplifier with fixed bias network providing gain and isolation.

Use Value: h_FE ≥ 40 at 10 mA ensures reliable 1:10 current gain, while C_eb = 30 pF limits bandwidth to ~5 MHz - sufficient for UART and SPI.

Use Scenario: Adding discrete output capability to resource-constrained microcontrollers in HVAC or PLC I/O modules.

IC Role / Device Role / Timing Role: General-purpose digital output stage switching 200–500 mA loads like solenoids or indicator lamps.

Use Value: I_C = 600 mA rating and –55°C to +150°C range support long-term reliability in unregulated industrial environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN switching and amplification applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT3904LT1G	Lower I_C (200 mA), lower V_CEO (40 V same), higher h_FE min (100), lower R_θJA (400°C/W)	Not suitable for >200 mA loads; better for low-current signal gain than power switching	Select when gain stability at low I_C matters more than current capacity.
PN2222A	TO-92 package only, higher P_D (1 W), same V_CEO/I_C, slower f_T (250 MHz vs 300 MHz typical)	Requires through-hole assembly; better thermal performance on heatsinked leads but incompatible SMT footprint	Select for prototyping or legacy through-hole designs where board space permits TO-92 mounting.

Compared with MMBT3904LT1G and PN2222A, the MMBT4401_D87Z uniquely balances 600 mA current handling, SOT-23 surface-mount compatibility, and 250 MHz f_T - making it optimal for space-constrained industrial switching where both power and speed matter.

Availability

MMBT4401_D87Z is available at Aetrix Electronics and suitable for LED driver circuits, DC-DC converter control stages, signal buffering systems, and microcontroller I/O expansion requiring stable component supply and consistent parametric performance across production batches.

Supply support for MMBT4401_D87Z 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

ON Semiconductor (now onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The MMBT4401_D87Z belongs to onsemi's general-purpose bipolar transistor product line, engineered for cost-sensitive, high-volume switching and amplification tasks where reliability across extended temperature ranges and consistent gain-bandwidth trade-offs are essential.

FAQ

What is the maximum continuous collector current rating for the MMBT4401_D87Z?

The MMBT4401_D87Z has a maximum continuous collector current (I_C) rating of 600 mA at T_A = 25°C. This rating assumes proper PCB thermal management; derating is required above 25°C at 2.8 mW/°C. At 100°C ambient, usable I_C drops to approximately 400 mA to maintain junction temperature ≤150°C. The MMBT4401_D87Z datasheet specifies this limit under steady-state DC conditions.

Is the MMBT4401_D87Z pin-compatible with the MMBT3904?

No, the MMBT4401_D87Z is not pin-compatible with the MMBT3904. While both use SOT-23 packages, the MMBT4401_D87Z has Emitter-Base-Collector (E-B-C) pinout (Pin 1 = E, Pin 2 = B, Pin 3 = C), whereas the MMBT3904 uses Emitter-Collector-Base (E-C-B). Swapping them without PCB revision will cause circuit failure. The MMBT4401_D87Z pinout is confirmed in Figure 17 of the official onsemi datasheet.

What is the typical V_CE(sat) of the MMBT4401_D87Z at 500 mA collector current?

The MMBT4401_D87Z exhibits a typical V_CE(sat) of 0.75 V at I_C = 500 mA and I_B = 50 mA, with a maximum specified value of 0.75 V under those conditions. This saturation voltage is measured with pulsed test conditions (≤300 μs, ≤2% duty cycle) and reflects worst-case conduction loss in switching applications. The MMBT4401_D87Z datasheet lists this parameter in Table 1 under Electrical Characteristics.

Does the MMBT4401_D87Z support operation at –55°C?

Yes, the MMBT4401_D87Z is fully specified for operation from –55°C to +150°C, as stated in its Absolute Maximum Ratings table. Electrical characteristics including h_FE, V_CE(sat), and leakage currents are characterized across this full range. The MMBT4401_D87Z is qualified for industrial and automotive under-hood applications where extreme cold-start performance is required.

What is the base-emitter saturation voltage (V_BE(sat)) range for the MMBT4401_D87Z?

The MMBT4401_D87Z has a V_BE(sat) range of 0.75–0.95 V at I_C = 150 mA/I_B = 15 mA, and 1.20 V at I_C = 500 mA/I_B = 50 mA. These values define the minimum base drive voltage needed to achieve full saturation. The MMBT4401_D87Z datasheet specifies these parameters in the Electrical Characteristics table under "Base-Emitter Saturation Voltage" with pulse test conditions.

MMBT4401_D87Z Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 600 mA

Voltage - Collector Emitter Breakdown (Max):: 40 V

Vce Saturation (Max) @ Ib, Ic:: 750mV @ 50mA, 500mA

Current - Collector Cutoff (Max):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 150mA, 1V

Power - Max:: 350 mW

Frequency - Transition:: 250MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

MMBT4401_D87Z FAQ

1.How can I place an order for MMBT4401_D87Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBT4401_D87Z 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 MMBT4401_D87Z reliable?

The price and inventory of MMBT4401_D87Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBT4401_D87Z is usually 5 days.

3.What payment methods are accepted for MMBT4401_D87Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBT4401_D87Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBT4401_D87Z?

MMBT4401_D87Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBT4401_D87Z 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 MMBT4401_D87Z?

For technical support, including MMBT4401_D87Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBT4401_D87Z requirements.

6.How does Aetrix verify that MMBT4401_D87Z is sourced from the original manufacturer or authorized distributors?

All MMBT4401_D87Z 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 MMBT4401_D87Z meets industry standards.

7.What is the process for return or replacement of MMBT4401_D87Z?

All MMBT4401_D87Z units undergo pre-shipment inspection (PSI). If there is an issue with MMBT4401_D87Z, 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 MMBT4401_D87Z part is unused and in its original packaging.

Return procedure for MMBT4401_D87Z:

1.Submit a request within 90 days.

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

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