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

Nexperia USA Inc. PMMT591A,235

Name: PMMT591A,235
Brand: Nexperia USA Inc.
SKU: PMMT591A,235
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PMMT591A,235

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: PMMT591A,235.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PMMT591A from Nexperia is a PNP 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 −500 mV V_CE(sat) at I_C = −1 A / I_B = −100 mA, enabling efficient power control in portable battery-powered systems.

For engineers reviewing the PMMT591A datasheet, PMMT591A pinout, PMMT591A application, or PMMT591A equivalent, key selection criteria include its PNP polarity, SOT23 thermal resistance (500 K/W), h_FE range (160–800), f_T of 150 MHz, and suitability for low-voltage, high-efficiency load switching where base drive efficiency and saturation voltage are critical.

Technical Context

This PNP BISS transistor uses optimized epitaxial base design to achieve high h_FE and low V_CE(sat) simultaneously. Its f_T of 150 MHz at I_C = −50 mA / V_CE = −10 V supports medium-speed switching up to ~100 kHz in DC-DC and LED driver stages.

Rated for T_j ≤ 150 °C and operating ambient from −65 °C to +150 °C, it maintains stable gain (h_FE ≥ 250 at I_C = −500 mA) and leakage (I_CEO ≤ −100 nA) across industrial temperature ranges-critical for automotive body electronics and industrial sensor interfaces.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−40 V: Maximum safe collector-emitter voltage under open-base condition; enables use in 24 V rail switching with margin.
I_C (DC)	−1 A: Continuous collector current capability; supports high-brightness LED strings or motor gate drivers.
V_CE(sat)	−500 mV @ I_C/I_B = −1 A/−100 mA: Low conduction loss reduces heat generation in compact PCB layouts.
h_FE	160–800: Wide DC current gain range ensures reliable turn-on across production lots and temperature extremes.
f_T	150 MHz: Transition frequency confirms suitability for pulse-width modulation (PWM) frequencies up to 100 kHz with minimal phase lag.
R_th(j-a)	500 K/W: Thermal resistance on FR4 board defines maximum power dissipation (250 mW) and heatsinking requirements.
C_c	12 pF @ V_CB = −10 V: Collector capacitance limits high-frequency noise coupling and affects switching speed in fast-switching nodes.

Pinout & Package

Supplied in SOT23 (TO-236AB) plastic surface-mount package: 3-pin, 1.3 mm × 2.9 mm footprint, 1.1 mm height, FR4-compatible thermal profile.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control input requiring −100 mA peak base drive for full saturation at 1 A collector current.
2	Emiter	PNP emitter terminal; connected to higher potential rail (e.g., battery positive) in high-side switch configuration.
3	Collector	Output node tied to load; sinks current when active; requires PCB copper pour for thermal management above 500 mA.

Key Features

Feature	Design Value
BISS process technology	Enables simultaneous high h_FE and low V_CE(sat) without trade-off-reducing base drive power and improving system efficiency.
Low V_BE(sat)	−1.1 V @ I_C/I_B = −1 A/−50 mA: Minimizes base resistor power loss and simplifies bias network design in space-constrained layouts.
High f_T	150 MHz: Supports clean edge transitions in PWM-driven loads, reducing EMI in battery-operated instrumentation.
Robust leakage performance	I_CEO ≤ −100 nA @ V_CE = −30 V: Ensures low standby current in always-on circuits like smoke detector logic interfaces.

Applications

LED Driver Circuits

Load Switch for Portable Devices

Use Scenario: Driving multi-segment white LED arrays in handheld medical testers with 3.3 V–12 V battery input.

IC Role / Device Role / Timing Role: High-side PNP switch controlling cathode-side current path; operates in linear or saturated mode depending on dimming method.

Use Value: −500 mV V_CE(sat) minimizes voltage drop across transistor, preserving headroom for LED forward voltage and extending battery life.

Use Scenario: Enabling/disabling power to GPS modules or Bluetooth radios in wearables during sleep mode.

IC Role / Device Role / Timing Role: Low-leakage PNP load switch isolating downstream circuitry; controlled by microcontroller GPIO.

Use Value: I_CEO ≤ −100 nA ensures sub-μA quiescent current, meeting <1 μA system sleep budget for multi-week battery operation.

Automotive Body Control

Industrial Sensor Interface

Use Scenario: Controlling interior lighting or mirror heater elements in 12 V automotive subsystems.

IC Role / Device Role / Timing Role: High-current PNP switch interfacing MCU outputs to resistive loads; handles pulsed 1 A surges during cold start.

Use Value: Rated T_j = 150 °C and h_FE stability over −40 °C to +125 °C ensure reliable operation in under-hood environments.

Use Scenario: Level-shifting and isolation between 3.3 V microcontrollers and 5 V/12 V analog sensor signal chains.

IC Role / Device Role / Timing Role: Active pull-up or signal inversion stage; provides galvanic separation and voltage translation.

Use Value: 150 MHz f_T and 12 pF C_c support clean 100 kHz sensor excitation signals without distortion or timing skew.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP high-current switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC807-40,215	Lower I_C rating (−500 mA), higher V_CE(sat) (−700 mV @ −500 mA), same SOT23 package.	Suitable for lower-power loads; less suitable for 1 A continuous switching or thermally constrained designs.	Select when cost sensitivity outweighs current/power requirements and thermal margin is ample.
ZTX951	TO-92 package, higher P_tot (1 W), but larger footprint and no SMT compatibility; V_CE(sat) = −400 mV @ −1 A.	Used in through-hole prototyping or legacy repair; not drop-in replaceable due to package mismatch.	Choose only for manual assembly or where board rework allows TO-92 footprint change and thermal mass is available.

Compared with BC807-40 and ZTX951, PMMT591A uniquely combines 1 A DC current, SOT23 mountability, and −500 mV V_CE(sat)-making it optimal for space-constrained, high-efficiency battery-powered switching where thermal density and base drive efficiency are prioritized.

Availability

PMMT591A is available at Aetrix Electronics and suitable for LED driver circuits, portable device load switching, and automotive body control modules requiring stable component supply and consistent parametric performance across production batches.

Supply support for PMMT591A 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 discrete semiconductors, formed in 2017 from the former NXP Standard Products division, specializing in high-volume, high-reliability components for automotive and industrial markets.

The PMMT591A belongs to Nexperia's BISS transistor product line-engineered specifically for high-current, low-saturation-voltage switching in compact SMT packages targeting battery-powered and thermally sensitive applications.

FAQ

Is PMMT591A pin-compatible with NPN transistors like PMMT491A?

No-PMMT591A is a PNP device with base-emitter-collector pinout (1-2-3), while PMMT491A is its NPN complement with reversed polarity and identical SOT23 pin assignment. Circuit topology must be inverted (e.g., high-side vs. low-side switching), and bias networks recalculated for opposite current flow direction and V_BE sign.

What is the maximum allowable PCB copper area for thermal relief at 1 A continuous current?

At I_C = −1 A and V_CE(sat) = −500 mV, power dissipation is 500 mW. With R_th(j-a) = 500 K/W on FR4, junction rise is ~250 °C-exceeding 150 °C limit. A minimum 25 mm² 2-oz copper pour connected to pin 3 (collector) reduces R_th(j-a) to ~120 K/W, enabling safe continuous operation.

Can PMMT591A be used in linear amplifier configurations?

It is not recommended-PMMT591A is optimized for switching (BISS process emphasizes low V_CE(sat) and high h_FE at high currents), not linearity or low-noise gain. Its h_FE variation across I_C (160–800) and lack of specified linearity parameters make it unsuitable for analog amplification; dedicated small-signal PNP transistors like BC856 should be used instead.

Does PMMT591A meet AEC-Q101 for automotive qualification?

No-PMMT591A is not AEC-Q101 qualified. While it operates across −65 °C to +150 °C and is used in automotive body electronics, Nexperia documents it as a standard industrial-grade discrete. For AEC-Q101-compliant alternatives, consider Nexperia's PBSS4041P or NSV60311DPZ series, which undergo full stress testing per automotive reliability standards.

PMMT591A,235 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:: PNP

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 @ 100mA, 5V

Power - Max:: 250 mW

Frequency - Transition:: 150MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

PMMT591A,235 FAQ

1.How can I place an order for PMMT591A,235 through Aetrix?

Please submit a Request for Quotation (RFQ) for PMMT591A,235 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 PMMT591A,235 reliable?

The price and inventory of PMMT591A,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PMMT591A,235 is usually 5 days.

3.What payment methods are accepted for PMMT591A,235?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PMMT591A,235 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PMMT591A,235?

PMMT591A,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PMMT591A,235 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 PMMT591A,235?

For technical support, including PMMT591A,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PMMT591A,235 requirements.

6.How does Aetrix verify that PMMT591A,235 is sourced from the original manufacturer or authorized distributors?

All PMMT591A,235 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 PMMT591A,235 meets industry standards.

7.What is the process for return or replacement of PMMT591A,235?

All PMMT591A,235 units undergo pre-shipment inspection (PSI). If there is an issue with PMMT591A,235, 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 PMMT591A,235 part is unused and in its original packaging.

Return procedure for PMMT591A,235:

1.Submit a request within 90 days.

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

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