Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

NXP Semiconductors PMSTA3904,135

Name: PMSTA3904,135
Brand: NXP Semiconductors
SKU: PMSTA3904,135
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: PMSTA3904,135

Manufacturer:: NXP Semiconductors

Category:: Single Bipolar Transistors

Package:: SC-70, SOT-323

Datasheet:: PMSTA3904,135.pdf

Description:: TRANS NPN 40V 0.2A SC-70

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:6,652

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

PMSTA3904,135 from NXP Semiconductors is a single NPN switching transistor in SOT323 (SC-70) package, rated for 40 V V_CEO, 200 mA I_C, and DC current gain (h_FE) of 100–300 at I_C = 10 mA. It features integrated extraction electrode for fast switching and AEC-Q101 qualification, making it suitable for automotive signal-level switching in compact PCB layouts.

For engineers reviewing the PMSTA3904,135 datasheet, PMSTA3904,135 pinout, PMSTA3904,135 application, or PMSTA3904,135 equivalent, key selection criteria include its 40 V breakdown voltage, 200 mA continuous collector current, 200 mW power dissipation at 25 °C, SC-70 footprint compatibility, and automotive-grade reliability under −65 °C to +150 °C ambient conditions.

Technical Context

The PMSTA3904,135 operates as a general-purpose bipolar junction transistor with fixed NPN polarity, optimized for low-voltage switching and small-signal amplification. Its base-emitter saturation voltage (V_BEsat) ranges from 650–850 mV at I_C = 10 mA/I_B = 1 mA, and collector-emitter saturation voltage (V_CEsat) is 75–200 mV under the same conditions.

Thermal performance is defined for FR4 PCB mounting: R_th(j-a) = 625 K/W in free air and R_th(j-sp) = 175 K/W to solder point. Switching times include t_d ≤ 35 ns, t_r ≤ 35 ns, t_s ≤ 200 ns, and t_f ≤ 50 ns at V_CC = 3 V, enabling use in medium-speed digital interface and load control circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum safe collector-emitter voltage with base open; defines upper rail limit for switching loads in 24 V automotive systems.
I_C	200 mA - Continuous collector current rating; supports driving LEDs, relays, or logic-level MOSFET gates without external heat sinking.
h_FE	100–300 at V_CE = 1 V, I_C = 10 mA - Stable DC current gain enables predictable base drive design for saturated switch operation.
V_CEsat	75–200 mV - Low saturation voltage minimizes conduction loss and self-heating during on-state operation.
f_T	300 MHz - Transition frequency confirms suitability for RF preamplifier stages or high-speed digital signal conditioning up to ~100 MHz.
R_th(j-a)	625 K/W - Thermal resistance indicates need for layout-aware copper pour or derating above 25 °C ambient to maintain T_j ≤ 150 °C.

Pinout & Package

SOT323 (SC-70) plastic surface-mounted package with 3 leads; dimensions: 2.2 mm × 1.35 mm × 0.95 mm (L × W × H), standard footprint per Fig 12 and Fig 13.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal requiring current-limited drive; typical I_B = 1 mA for 10 mA I_C saturation.
2	Emiter	Common reference node; connected to ground or low-side return path in switching configurations.
3	Collector	Load connection point; handles switched current up to 200 mA with V_CE ≤ 40 V.

Key Features

Feature	Design Value
Integrated extraction electrode	Reduces minority carrier storage time, enabling t_s ≤ 200 ns and t_off ≤ 250 ns for reliable 1–5 MHz switching.
AEC-Q101 qualification	Validated for automotive applications including engine control modules, body electronics, and infotainment power sequencing.
Low V_CEsat (75–200 mV)	Minimizes power loss (P_loss ≈ I_C × V_CEsat) in battery-powered or thermally constrained designs.
High f_T (300 MHz)	Supports analog signal amplification and RF biasing in sub-100 MHz front-end circuits without external compensation.

Applications

Automotive Body Control Module	LED Driver Circuit
Use Scenario: Controlling door lock actuators, window lift motors, or interior lighting via microcontroller GPIO. IC Role / Device Role / Timing Role: Low-side switch interfacing MCU output to 12 V inductive or resistive loads. Use Value: AEC-Q101 qualification ensures long-term reliability in temperature-cycled vehicle environments; 200 mA rating covers most solenoid and LED string requirements.	Use Scenario: Constant-current switching for indicator LEDs or backlight segments in instrument clusters. IC Role / Device Role / Timing Role: Current-switching element regulating LED on/off state with minimal forward voltage drop. Use Value: V_CEsat ≤ 200 mV reduces thermal load on PCB and extends LED lifetime versus higher-V_CEsat alternatives.
Industrial Sensor Interface	Consumer Power Management
Use Scenario: Level-shifting and buffering analog sensor outputs (e.g., thermistor, potentiometer) into ADC inputs. IC Role / Device Role / Timing Role: Small-signal amplifier configured in common-emitter or emitter-follower topology. Use Value: h_FE = 100–300 provides stable gain across temperature; low noise figure (NF ≤ 5 dB) preserves signal integrity.	Use Scenario: Enabling/disabling power rails for peripherals (USB ports, audio codecs) in portable devices. IC Role / Device Role / Timing Role: Load switch controlled by system PMIC or application processor GPIO. Use Value: Fast turn-off (t_off ≤ 250 ns) prevents backfeed during rail sequencing; SC-70 footprint saves board space in dense layouts.

Automotive Body Control Module

LED Driver Circuit

Use Scenario: Controlling door lock actuators, window lift motors, or interior lighting via microcontroller GPIO.

IC Role / Device Role / Timing Role: Low-side switch interfacing MCU output to 12 V inductive or resistive loads.

Use Value: AEC-Q101 qualification ensures long-term reliability in temperature-cycled vehicle environments; 200 mA rating covers most solenoid and LED string requirements.

Use Scenario: Constant-current switching for indicator LEDs or backlight segments in instrument clusters.

IC Role / Device Role / Timing Role: Current-switching element regulating LED on/off state with minimal forward voltage drop.

Use Value: V_CEsat ≤ 200 mV reduces thermal load on PCB and extends LED lifetime versus higher-V_CEsat alternatives.

Industrial Sensor Interface

Consumer Power Management

Use Scenario: Level-shifting and buffering analog sensor outputs (e.g., thermistor, potentiometer) into ADC inputs.

IC Role / Device Role / Timing Role: Small-signal amplifier configured in common-emitter or emitter-follower topology.

Use Value: h_FE = 100–300 provides stable gain across temperature; low noise figure (NF ≤ 5 dB) preserves signal integrity.

Use Scenario: Enabling/disabling power rails for peripherals (USB ports, audio codecs) in portable devices.

IC Role / Device Role / Timing Role: Load switch controlled by system PMIC or application processor GPIO.

Use Value: Fast turn-off (t_off ≤ 250 ns) prevents backfeed during rail sequencing; SC-70 footprint saves board space in dense layouts.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC846B,215	Same SOT323 package, but V_CEO = 65 V and h_FE = 200–450 at I_C = 10 mA; no AEC-Q101 qualification.	Higher voltage margin suits industrial 48 V systems; unsuitable for automotive qualification-critical designs.	Select BC846B,215 only when extended breakdown voltage is required and automotive compliance is not mandated.
MMBT3904LT1G	SOT-23 package (larger footprint), V_CEO = 40 V, I_C = 200 mA, h_FE = 100–300; AEC-Q101 qualified but different thermal resistance (R_th(j-a) = 400 K/W).	Compatible electrical specs but requires PCB layout change; better thermal performance allows higher ambient operation.	Choose MMBT3904LT1G if board redesign is feasible and improved thermal handling justifies larger package size.

Compared with PMSTA3904,135, BC846B,215 offers higher voltage headroom but lacks automotive qualification, while MMBT3904LT1G delivers identical electrical ratings in a thermally superior but physically larger SOT-23 package-making PMSTA3904,135 optimal for space-constrained AEC-Q101 designs.

Availability

PMSTA3904,135 is available at Aetrix Electronics and suitable for automotive body electronics, LED lighting control, and industrial sensor interface applications requiring stable component supply and AEC-Q101-compliant discrete transistors.

Supply support for PMSTA3904,135 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

NXP Semiconductors is a global semiconductor company specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with headquarters in Eindhoven, Netherlands.

The PMSTA3904,135 belongs to NXP's general-purpose bipolar transistor product line, engineered for cost-effective, high-reliability switching and amplification in space-constrained and automotive-grade electronic systems.

FAQ

What is the maximum operating temperature for PMSTA3904,135?

The PMSTA3904,135 has a junction temperature limit of 150 °C and an ambient operating range of −65 °C to +150 °C. When used at full 200 mA collector current, thermal derating must be applied per the power derating curve (Fig 2), reducing allowable power dissipation above 25 °C ambient to ensure T_j stays within specification. The PMSTA3904,135 achieves this via its specified R_th(j-a) = 625 K/W on FR4 PCB.

Is PMSTA3904,135 pin-compatible with other SOT323 NPN transistors?

The PMSTA3904,135 uses standard SOT323 pinout (Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector), matching industry convention for SC-70-packaged NPN transistors. However, direct pin-to-pin replacement requires verification of matching V_CEO, I_C, h_FE, and saturation characteristics-PMSTA3904,135 is not guaranteed compatible with all SOT323 NPN parts without circuit-level validation.

Does PMSTA3904,135 support linear amplification applications?

Yes, the PMSTA3904,135 supports linear amplification with h_FE = 100–300 across I_C = 0.1–100 mA and V_CE = 1 V, low noise figure (≤5 dB), and transition frequency of 300 MHz. Its V_BEsat and V_CEsat curves show stable behavior across temperature, making the PMSTA3904,135 suitable for low-noise preamplifiers and signal buffering where gain stability matters.

What marking code identifies PMSTA3904,135 on the device?

The PMSTA3904,135 is marked with code *1Y on the top surface of the SOT323 package, as confirmed in Table 4 of the NXP datasheet. The asterisk prefix denotes manufacturing location (e.g., '*' = Hong Kong), and '1Y' is the unique type identifier for this NPN transistor variant.

How does the AEC-Q101 qualification impact PMSTA3904,135 usage?

AEC-Q101 qualification means the PMSTA3904,135 has passed stress tests for temperature cycling, humidity, mechanical shock, and high-temperature operating life-specifically validated for discrete semiconductors in automotive environments. This allows direct use in non-safety-critical automotive systems (e.g., lighting, HVAC, infotainment) without additional component-level qualification, unlike commercial-grade equivalents such as BC846B,215.

PMSTA3904,135 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 200 mA

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

Vce Saturation (Max) @ Ib, Ic:: 300mV @ 5mA, 50mA

Current - Collector Cutoff (Max):: 50nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 10mA, 1V

Power - Max:: 200 mW

Frequency - Transition:: 300MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SC-70

PMSTA3904,135 FAQ

1.How can I place an order for PMSTA3904,135 through Aetrix?

Please submit a Request for Quotation (RFQ) for PMSTA3904,135 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 PMSTA3904,135 reliable?

The price and inventory of PMSTA3904,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PMSTA3904,135 is usually 5 days.

3.What payment methods are accepted for PMSTA3904,135?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PMSTA3904,135 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PMSTA3904,135?

PMSTA3904,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PMSTA3904,135 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 PMSTA3904,135?

For technical support, including PMSTA3904,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PMSTA3904,135 requirements.

6.How does Aetrix verify that PMSTA3904,135 is sourced from the original manufacturer or authorized distributors?

All PMSTA3904,135 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 PMSTA3904,135 meets industry standards.

7.What is the process for return or replacement of PMSTA3904,135?

All PMSTA3904,135 units undergo pre-shipment inspection (PSI). If there is an issue with PMSTA3904,135, 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 PMSTA3904,135 part is unused and in its original packaging.

Return procedure for PMSTA3904,135:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…