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

Nexperia USA Inc. PMBTA42,185

Name: PMBTA42,185
Brand: Nexperia USA Inc.
SKU: PMBTA42,185
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PMBTA42,185

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: PMBTA42,185.pdf

Description:: TRANS NPN 300V 0.1A TO-236AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PMBTA42,185 from Nexperia is a 300 V, 100 mA NPN high-voltage transistor in SOT23 package, designed for switching and amplification in high-voltage telephony interfaces. It delivers 300 V V_CEO, 100 mA I_C, DC current gain (h_FE) ≥40 at 30 mA, AEC-Q101 qualification, and 500 mW power dissipation at T_amb ≤25 °C.

For engineers reviewing the PMBTA42,185 datasheet, PMBTA42,185 pinout, PMBTA42,185 application, or PMBTA42,185 equivalent, key selection criteria include high-voltage blocking capability, automotive-grade reliability, SOT23 footprint compatibility, and verified performance in telecom line interface circuits.

Technical Context

This discrete NPN bipolar junction transistor operates with open-base collector-emitter breakdown voltage up to 300 V and supports continuous collector current up to 100 mA. Its h_FE of ≥40 at V_CE = 10 V and I_C = 30 mA enables stable current-controlled switching in high-impedance signal paths.

Thermal resistance R_th(j-a) is 500 K/W on FR4 PCB, limiting practical power handling without heatsinking. The device exhibits low leakage (I_CBO ≤100 nA at V_CB = 200 V) and fast transition frequency (f_T = 50 MHz), supporting moderate-speed switching in analog and digital interface stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	300 V - Enables direct use in 200 V telecom ring-signal circuits without external voltage clamping
I_C	100 mA - Supports driving relay coils, LED arrays, or logic-level translation in HV interface ICs
h_FE	≥40 at I_C = 30 mA - Ensures reliable base-current-driven switching with margin for temperature drift
V_CE(sat)	≤500 mV - Minimizes conduction loss and self-heating during active switching states
f_T	50 MHz - Allows operation in pulse-width modulation (PWM) control up to ~5–10 MHz with adequate gain
R_th(j-a)	500 K/W - Requires thermal-aware PCB layout (copper pour, spacing) for sustained >150 mW operation
AEC-Q101	Qualified - Validated for automotive under-hood and infotainment subsystems per stress test requirements

Pinout & Package

SOT23 plastic surface-mount package: 3-terminal, 1.9 mm pitch, 2.9 mm × 1.3 mm × 1.0 mm body, tin-plated leads, FR4-compatible footprint.

Pin/Terminal	Circuit Role	Design Meaning
1 (B)	Base	Current-controlled input node; requires series resistor to limit I_B ≤100 mA peak and ensure saturation
2 (E)	Emitter	Common reference terminal; tied to system ground or negative rail in low-side switch configuration
3 (C)	Collector	High-voltage output node; handles up to 300 V transient spikes when used with flyback protection

Key Features

Feature	Design Value
High-voltage blocking	300 V V_CEO rating enables direct integration into telephone line interface units (LIUs) and PBX circuits
AEC-Q101 qualification	Validated for automotive grade-1 temperature range (−40 °C to +125 °C junction) and mechanical stress testing
Low leakage current	I_CBO ≤100 nA at 200 V ensures minimal standby power loss in always-on telecom monitoring circuits
Compact SOT23 footprint	Replaces larger TO-92 devices while maintaining thermal performance via optimized PCB copper area

Applications

Telecom Line Interface

Automotive Signal Conditioning

Use Scenario: Isolating and switching 48 V/200 V AC ring signals in VoIP gateways and analog telephone adapters.

IC Role / Device Role / Timing Role: NPN high-side or low-side switch controlling relay drivers or optocoupler inputs in line-card circuitry.

Use Value: 300 V V_CEO eliminates need for external Zener clamping; SOT23 saves board space vs. TO-92 alternatives.

Use Scenario: Driving solenoid valves or status LEDs in engine control modules where high-voltage transients occur.

IC Role / Device Role / Timing Role: Discrete switching element interfacing microcontroller GPIO to 24 V loads with transient suppression.

Use Value: AEC-Q101 qualification ensures reliability under automotive thermal cycling and ESD stress conditions.

Industrial Sensor Power Switching

Legacy Equipment Voltage Translation

Use Scenario: Enabling/disabling 24–48 V sensors in factory automation systems with microcontroller-level control.

IC Role / Device Role / Timing Role: Low-side load switch providing galvanic isolation between logic and field-side power domains.

Use Value: 100 mA I_C and 500 mV V_CE(sat) minimize heat generation during continuous operation.

Use Scenario: Level-shifting TTL/CMOS outputs to drive legacy 12 V or 24 V logic inputs in industrial PLC backplanes.

IC Role / Device Role / Timing Role: Active pull-up/pull-down transistor translating logic thresholds across incompatible voltage rails.

Use Value: h_FE ≥40 ensures robust drive capability even at elevated ambient temperatures (>85 °C).

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage NPN transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC817-40,215	V_CEO = 45 V, I_C = 500 mA, h_FE = 250–630 - lower voltage rating, higher current, wider gain spread	Not suitable for >100 V circuits; preferred for general-purpose 5–24 V switching where gain consistency matters more than HV tolerance	Select only if operating voltage remains ≤45 V and higher h_FE improves base drive efficiency
PMBTA44,115	V_CEO = 400 V, I_C = 300 mA, h_FE = 100–300 - higher voltage/current ratings, same SOT23 package	Supports 400 V ring signals and heavier loads; may require derating base resistor due to higher h_FE variation	Choose when upgrading from PMBTA42 for increased margin in new designs or higher-power telecom interfaces

Compared with BC817-40,215 and PMBTA44,115, the PMBTA42,185 uniquely balances 300 V capability, AEC-Q101 compliance, and SOT23 compactness-making it optimal for cost-sensitive, space-constrained telecom and automotive interface designs requiring precise HV switching without over-engineering.

Availability

PMBTA42,185 is available at Aetrix Electronics and suitable for telephony interfaces, automotive signal conditioning, industrial sensor switching, and legacy voltage translation requiring stable component supply and long-term lifecycle support.

Supply support for PMBTA42,185 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 semiconductor expert focused on high-volume, high-reliability discrete and logic devices, headquartered in Nijmegen, Netherlands.

The PMBTA42,185 belongs to Nexperia's high-voltage bipolar transistor product line, engineered specifically for robust switching in telecom infrastructure, automotive electronics, and industrial control systems where voltage resilience and qualification integrity are critical.

FAQ

Is PMBTA42,185 suitable for automotive applications?

Yes. It is AEC-Q101 qualified for automotive grade-1 (−40 °C to +125 °C junction temperature), validated for mechanical stress, temperature cycling, and humidity testing. It is deployed in engine control, body electronics, and infotainment subsystems where high-voltage signal switching is required.

What is the maximum safe operating voltage for PMBTA42,185?

The absolute maximum collector-emitter voltage (V_CEO) is 300 V under open-base conditions. For reliable long-term operation, design margins recommend limiting steady-state V_CE to ≤240 V and transient peaks to ≤280 V with appropriate snubbing or clamping networks.

Can PMBTA42,185 replace BC847 in high-voltage circuits?

No. BC847 has V_CEO = 45 V and is unsuitable above 50 V. PMBTA42,185 provides 6× higher voltage rating and different gain/thermal characteristics. Direct substitution would risk catastrophic failure in circuits exceeding BC847's rating.

Does PMBTA42,185 have a PNP complement in the same package?

Yes. The PNP complement is PMBTA92, also in SOT23, with matching 300 V V_CEO, 100 mA I_C, and AEC-Q101 qualification. Both share identical pinout (1=B, 2=E, 3=C), enabling symmetrical push-pull or complementary switching designs.

PMBTA42,185 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):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 300 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 2mA, 20mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 40 @ 30mA, 10V

Power - Max:: 250 mW

Frequency - Transition:: 50MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

PMBTA42,185 FAQ

1.How can I place an order for PMBTA42,185 through Aetrix?

Please submit a Request for Quotation (RFQ) for PMBTA42,185 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 PMBTA42,185 reliable?

The price and inventory of PMBTA42,185 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PMBTA42,185 is usually 5 days.

3.What payment methods are accepted for PMBTA42,185?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PMBTA42,185 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PMBTA42,185?

PMBTA42,185 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PMBTA42,185 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 PMBTA42,185?

For technical support, including PMBTA42,185 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PMBTA42,185 requirements.

6.How does Aetrix verify that PMBTA42,185 is sourced from the original manufacturer or authorized distributors?

All PMBTA42,185 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 PMBTA42,185 meets industry standards.

7.What is the process for return or replacement of PMBTA42,185?

All PMBTA42,185 units undergo pre-shipment inspection (PSI). If there is an issue with PMBTA42,185, 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 PMBTA42,185 part is unused and in its original packaging.

Return procedure for PMBTA42,185:

1.Submit a request within 90 days.

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

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