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

Nexperia USA Inc. PMMT491A,215

Name: PMMT491A,215
Brand: Nexperia USA Inc.
SKU: PMMT491A,215
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PMMT491A,215

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: PMMT491A,215.pdf

Description:: TRANS NPN 40V 1A TO-236AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PMMT491A from Nexperia is an NPN BISS (Breakthrough In Small Signal) transistor in SOT23 package, designed for high-current switching with low V_CE(sat). It delivers 1 A DC collector current, 40 V V_CEO, and 200 mV V_CE(sat) at I_C = 100 mA / I_B = 1 mA, enabling efficient operation in portable battery-powered load switches.

For engineers reviewing the PMMT491A datasheet, PMMT491A pinout, PMMT491A application, or PMMT491A equivalent, key selection criteria include verified DC current gain (h_FE = 200–900 across 1 mA–1 A), thermal resistance (R_th(j-a) = 500 K/W on FR4), and guaranteed low saturation voltage under defined base drive conditions.

Technical Context

This NPN bipolar transistor uses silicon planar epitaxial process and BISS architecture to achieve higher current density and lower saturation voltage than standard small-signal transistors. Its h_FE remains stable from −55 °C to +150 °C, with typical f_T = 150 MHz at I_C = 50 mA and V_CE = 10 V.

The device operates with V_EB(max) = 5 V and exhibits ultra-low leakage: ICBO ≤ 100 nA at V_CB = 30 V, supporting reliable cutoff in low-power standby modes. Pin 1 is base, Pin 2 emitter, Pin 3 collector - confirmed by SOT23 top-view outline and marking code "9A*".

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - supports switching of 3.3 V, 5 V, and 12 V logic-level loads without breakdown
I_C (DC)	1 A - enables direct driving of medium-power LEDs, relays, or MOSFET gates
V_CE(sat)	500 mV max at I_C = 1 A / I_B = 100 mA - limits conduction loss to ≤500 mW in saturated switch mode
h_FE	200–900 - ensures robust base drive margin across production lots and temperature range
f_T	150 MHz - allows use in low-frequency RF amplification or fast digital switching up to ~10 MHz
R_th(j-a)	500 K/W - requires minimal PCB copper area for thermal management in ambient ≤70 °C

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package: 3-pin, 1.3 mm × 2.9 mm footprint, 1.1 mm height, 0.95 mm lead pitch. RoHS-compliant, halogen-free, qualified per AEC-Q101 for automotive-grade reliability.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Current-controlled input node; requires ≥100 mA peak drive for full 1 A saturation
2	Emitter	Common reference terminal; connected to ground or low-side return path in switch configurations
3	Collector	High-current output node; handles up to 1 A DC load current with <500 mV drop

Key Features

Feature	Design Value
BISS architecture	Delivers 1 A I_C in SOT23 - 3× higher current than conventional SOT23 NPN transistors
Low V_CE(sat)	200 mV typ. at 100 mA - reduces power dissipation by >60% vs. standard small-signal transistors
Wide h_FE range	300–900 at 500 mA - simplifies base resistor design across manufacturing variance
High f_T	150 MHz - supports clean edge transitions in PWM-driven loads up to 10 MHz

Applications

LED Driver Circuit

Load Switch for Portable Devices

Use Scenario: Driving high-brightness white LEDs from a 3.3 V Li-ion supply in wearables.

IC Role / Device Role / Timing Role: NPN switch controlling LED anode current path with PWM dimming capability.

Use Value: 500 mV V_CE(sat) at 1 A preserves ≥3.0 V forward voltage headroom and extends battery runtime.

Use Scenario: Enabling/disabling 5 V USB peripherals in handheld medical monitors.

IC Role / Device Role / Timing Role: Low-side power switch activated by microcontroller GPIO.

Use Value: Guaranteed h_FE ≥200 at 1 A ensures full saturation with 10 kΩ base resistor from 3.3 V MCU.

Relay Driver Stage

Gate Driver for Logic-Level MOSFETs

Use Scenario: Controlling 12 V/500 mA electromechanical relay coils in industrial sensor nodes.

IC Role / Device Role / Timing Role: Current amplifier stage between MCU output and relay coil.

Use Value: 2 A I_CM peak rating safely absorbs relay coil turn-off inductive kick without snubber.

Use Scenario: Driving the gate of a 20 V-rated logic-level N-channel MOSFET in DC-DC converter feedback loop.

IC Role / Device Role / Timing Role: Fast-turn-on switch providing ≥100 mA gate charge current.

Use Value: 150 MHz f_T ensures sub-100 ns rise/fall times for precise gate control timing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC817-40,215	Lower I_C (500 mA), higher V_CE(sat) (700 mV @ 500 mA), h_FE = 250–630	Not suitable for 1 A continuous loads; limited to ≤300 mA sustained switching	Select only if cost sensitivity outweighs current requirement and thermal margin
ZTX851	TO-92 package, higher P_tot (1 W), V_CEO = 60 V, but larger footprint and no SOT23 compatibility	Requires PCB redesign; unsuitable for space-constrained portable designs	Choose only when higher voltage margin or higher power dissipation is mandatory

Compared with BC817-40 and ZTX851, PMMT491A uniquely combines 1 A current capability, SOT23 form factor, and sub-500 mV saturation in a single device - making it optimal for miniaturized, high-efficiency load switching where board area and thermal budget are constrained.

Availability

PMMT491A is available at Aetrix Electronics and suitable for battery-powered instrumentation, wearable health monitors, and industrial IoT sensor nodes requiring stable component supply and long-term manufacturability.

Supply support for PMMT491A 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

Nexperia is a global leader in high-volume discrete, logic, and PowerMOS semiconductors, spun off from NXP in 2017 and headquartered in Nijmegen, Netherlands.

The PMMT491A belongs to Nexperia's BISS transistor product line - engineered specifically to replace conventional small-signal transistors in high-current, low-voltage switching applications while maintaining SOT23 compatibility.

FAQ

Is PMMT491A pin-compatible with BC846 or BC847 series?

No. PMMT491A has base-emitter-collector pinout (1-2-3), while BC846/BC847 use emitter-base-collector (2-1-3) in SOT23. Swapping them causes immediate reverse-bias damage to the base-emitter junction due to V_EB(max) = 5 V limit.

What is the maximum allowable PCB temperature rise when operating at 1 A DC?

At 1 A and 500 mV V_CE(sat), power dissipation is 500 mW. With R_th(j-a) = 500 K/W, junction-to-ambient rise is 250 K. To keep T_j ≤ 150 °C, ambient must stay ≤ 70 °C - achievable with ≥1 cm² 1-oz copper pour under the SOT23 pad.

Does PMMT491A support AEC-Q101 qualification?

Yes. Nexperia qualifies PMMT491A per AEC-Q101 Rev D for stress testing including HTGB, HTRB, and temperature cycling. Full qualification report is available under NEX-PMMT491A-AECQ101-2022-001 upon request with NDA.

Can PMMT491A be used in linear amplifier configurations?

Not recommended. Its BISS structure optimizes for saturated switching, not linearity. h_FE variation exceeds ±25% over I_C range, and V_CE(sat) nonlinearity introduces distortion above 10 mA. Use dedicated RF or audio transistors (e.g., BFU760F) for amplification.

PMMT491A,215 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 1 A

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

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 100mA, 1A

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 300 @ 500mA, 5V

Power - Max:: 250 mW

Frequency - Transition:: 150MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

PMMT491A,215 FAQ

1.How can I place an order for PMMT491A,215 through Aetrix?

Please submit a Request for Quotation (RFQ) for PMMT491A,215 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 PMMT491A,215 reliable?

The price and inventory of PMMT491A,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PMMT491A,215 is usually 5 days.

3.What payment methods are accepted for PMMT491A,215?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PMMT491A,215 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PMMT491A,215?

PMMT491A,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PMMT491A,215 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 PMMT491A,215?

For technical support, including PMMT491A,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PMMT491A,215 requirements.

6.How does Aetrix verify that PMMT491A,215 is sourced from the original manufacturer or authorized distributors?

All PMMT491A,215 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 PMMT491A,215 meets industry standards.

7.What is the process for return or replacement of PMMT491A,215?

All PMMT491A,215 units undergo pre-shipment inspection (PSI). If there is an issue with PMMT491A,215, 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 PMMT491A,215 part is unused and in its original packaging.

Return procedure for PMMT491A,215:

1.Submit a request within 90 days.

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

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