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

STMicroelectronics STD888T4

Name: STD888T4
Brand: STMicroelectronics
SKU: STD888T4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STD888T4

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: STD888T4.pdf

Description:: TRANS PNP 30V 5A DPAK

Quantity:: RFQ Add To RFQ list

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Inventory:9,272

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Product details

Overview

STD888T4 from STMicroelectronics is a medium-current, high-performance PNP bipolar junction transistor in DPAK (TO-252) package, rated for -30 V V_CEO, -5 A continuous collector current, and 15 W power dissipation at T_C = 25°C; it delivers V_CE(sat) as low as -0.7 V at I_C = -0.5 A / I_B = -5 mA and h_FE ≥ 100 at I_C = -500 mA, used in battery charger switching regulators and portable equipment power management.

For engineers reviewing the STD888T4 datasheet, STD888T4 pinout, STD888T4 application, or STD888T4 equivalent, key selection criteria include verified V_CE(sat) performance at high I_C, thermal resistance (R_thj-case ≤ 8.33°C/W), safe operating area under pulsed heavy-load conditions, and ECOPACK® lead-free compliance for industrial-grade surface-mount deployment.

Technical Context

This PNP transistor employs ST's low-voltage Planar "Base Island" layout to achieve simultaneous high DC gain and low saturation voltage. It operates with V_EB up to -6 V, supports pulsed collector currents up to -10 A (t_P < 5 ms), and maintains h_FE ≥ 35 even at I_C = -10 A and T_C = 100°C.

Switching performance is characterized with resistive load test conditions: t_d = 180 ns, t_r = 160 ns, t_s = 250 ns, t_f = 80 ns at I_C = -3 A, V_CC = -20 V, and matched base drive (I_B1 = I_B2 = -60 mA), enabling efficient operation in high-frequency switching regulator stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-30 V - Maximum safe collector-emitter blocking voltage with base open, defining usable supply rail headroom in linear and switching applications.
I_C (cont.)	-5 A - Continuous DC collector current rating at T_C = 25°C, supporting heavy-load driver stages without forced cooling.
V_CE(sat)	-0.7 V @ I_C = -0.5 A / I_B = -5 mA - Low conduction loss enabling >92% efficiency in 3.3–5 V bias supply switches.
h_FE	100 min @ I_C = -500 mA - Sufficient current gain to drive with microcontroller GPIOs without external pre-biasing.
R_thj-case	8.33°C/W max - Enables 15 W power dissipation with ≤125°C junction rise above case, suitable for compact heatsinked PCB layouts.
T_J max	150°C - Allows reliable operation in sealed portable enclosures with ambient up to 75°C and moderate airflow.

Pinout & Package

The STD888T4 is housed in a surface-mount DPAK (TO-252) package with exposed drain pad for thermal enhancement and RoHS-compliant ECOPACK® construction.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal of PNP transistor	Connected to higher potential rail; carries full load current and defines reference for base drive polarity.
2 (Collector)	Collector terminal of PNP transistor	Connected to load return path; must withstand reverse voltage up to -45 V (V_CBO) during switching transients.
3 (Base)	Control input for minority-carrier injection	Receives negative current to turn on; requires -250 mA base drive for full -5 A saturation, demanding robust driver stage design.

Key Features

Feature	Design Value
Low V_CE(sat)	V_CE(sat) ≤ -1.2 V at I_C = -5 A / I_B = -250 mA - Reduces conduction loss by ≥40% vs. standard PNP transistors in 5 V systems.
High h_FE	h_FE ≥ 100 at I_C = -500 mA - Enables direct MCU GPIO drive without additional amplification stage in low-speed control circuits.
DPAK thermal performance	R_thj-case ≤ 8.33°C/W - Supports 15 W dissipation with minimal heatsinking, ideal for space-constrained portable PCBs.
ECOPACK® compliance	Lead-free second-level interconnect per JEDEC JESD97 - Meets global environmental regulations without compromising solder joint reliability.

Applications

Battery Charger Switching Regulator

Portable Equipment Power Management

Use Scenario: High-efficiency buck-type charging circuit for Li-ion packs in handheld medical devices.

IC Role / Device Role / Timing Role: Main PNP switch controlling energy transfer from input to output inductor-capacitor network.

Use Value: V_CE(sat) ≤ -1.2 V at -5 A minimizes heat generation in sealed enclosures, extending battery runtime and thermal safety margin.

Use Scenario: Load switching for auxiliary rails (e.g., display backlight, sensor bias) in ruggedized tablets.

IC Role / Device Role / Timing Role: High-side PNP switch enabling ON/OFF control of 3.3 V or 5 V subsystems via microcontroller GPIO.

Use Value: h_FE ≥ 100 at -500 mA allows direct drive from 3.3 V logic with <10 kΩ base resistor, eliminating level-shifter ICs.

Voltage Regulation in Bias Supplies

Heavy Load Driver for Industrial Sensors

Use Scenario: Linear post-regulation stage delivering stable 2.5 V bias to precision ADC references in data loggers.

IC Role / Device Role / Timing Role: Pass transistor in emitter-follower configuration, dissipating up to 1.5 W under worst-case dropout.

Use Value: R_thj-case ≤ 8.33°C/W ensures junction temperature stays below 125°C with 25°C ambient and no heatsink, meeting long-term reliability targets.

Use Scenario: Driving solenoid valves or relay coils requiring -4 A peak current in factory automation I/O modules.

IC Role / Device Role / Timing Role: High-current PNP driver interfacing between isolated digital controller and inductive load.

Use Value: I_CM = -10 A (5 ms pulse) supports surge currents during coil energization without secondary overcurrent protection.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD2955T4	V_CEO = -60 V, V_CE(sat) = -1.8 V @ -4 A, h_FE = 20–70 - Higher voltage rating but significantly higher saturation loss.	Better suited for 24 V industrial systems; less efficient in 5 V portable designs due to 2.6× higher conduction loss.	Select when higher breakdown margin is required and thermal budget allows extra 1.1 V × I_C loss.
PN2907A	TO-92 package, I_C = -600 mA, V_CE(sat) = -1.6 V @ -500 mA - Not a drop-in replacement; limited current and power handling.	Only viable for signal-level switching; cannot replace STD888T4 in any application exceeding 1 A continuous load.	Use only for prototyping or ultra-low-cost non-power applications where DPAK footprint and thermal capability are unnecessary.

Compared with MJD2955T4 and PN2907A, STD888T4 uniquely balances -5 A current capability, sub-1 V saturation, and DPAK thermal performance-making it the only option among the three suitable for production-grade 3–5 V portable power switches requiring both efficiency and reliability.

Availability

STD888T4 is available at Aetrix Electronics and suitable for battery charger switching regulators, portable equipment power management, and voltage regulation in bias supply circuits requiring stable component supply across multi-year production cycles.

Supply support for STD888T4 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

STD888T4 belongs to ST's high-performance discrete transistor product line, engineered specifically for efficient, thermally robust PNP switching in space-constrained, battery-powered applications.

FAQ

What is the maximum safe continuous collector current for STD888T4?

The STD888T4 is rated for -5 A continuous collector current at case temperature T_C = 25°C. Derating is required above this temperature: at T_C = 100°C, maximum continuous I_C drops to approximately -2.5 A based on its 15 W total dissipation limit and thermal resistance of 8.33°C/W.

Does STD888T4 require a heatsink in typical 5 V switching applications?

A heatsink is not mandatory for STD888T4 in 5 V applications drawing ≤2 A continuous current if PCB copper area ≥ 250 mm² is used beneath the exposed DPAK pad. At full -5 A, a small clip-on heatsink (thermal resistance ≤ 15°C/W) is recommended to maintain T_J < 125°C in still-air environments.

Can STD888T4 be driven directly by a 3.3 V microcontroller GPIO?

Yes - with appropriate base resistor selection. At I_C = -500 mA, h_FE ≥ 100 ensures ≤5 mA base current is needed. A 680 Ω resistor between 3.3 V GPIO and base yields ~4.3 mA drive, sufficient for saturation while staying within typical MCU output limits.

Is STD888T4 compliant with lead-free assembly standards?

Yes - STD888T4 uses ST's ECOPACK® packaging with lead-free second-level interconnect, fully compliant with JEDEC Standard JESD97 and RoHS Directive 2002/95/EC. Its solder profile supports standard Pb-free reflow (peak 260°C, 10 s max) without degradation.

STD888T4 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 5 A

Voltage - Collector Emitter Breakdown (Max):: 30 V

Vce Saturation (Max) @ Ib, Ic:: 1.2V @ 500mA, 10A

Current - Collector Cutoff (Max):: 10µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 500mA, 1V

Power - Max:: 15 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

STD888T4 FAQ

1.How can I place an order for STD888T4 through Aetrix?

Please submit a Request for Quotation (RFQ) for STD888T4 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 STD888T4 reliable?

The price and inventory of STD888T4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STD888T4 is usually 5 days.

3.What payment methods are accepted for STD888T4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STD888T4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STD888T4?

STD888T4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STD888T4 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 STD888T4?

For technical support, including STD888T4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STD888T4 requirements.

6.How does Aetrix verify that STD888T4 is sourced from the original manufacturer or authorized distributors?

All STD888T4 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 STD888T4 meets industry standards.

7.What is the process for return or replacement of STD888T4?

All STD888T4 units undergo pre-shipment inspection (PSI). If there is an issue with STD888T4, 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 STD888T4 part is unused and in its original packaging.

Return procedure for STD888T4:

1.Submit a request within 90 days.

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

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