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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Bipolar Transistor Arrays

STMicroelectronics STD815CP40

Name: STD815CP40
Brand: STMicroelectronics
SKU: STD815CP40
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STD815CP40

Manufacturer:: STMicroelectronics

Category:: Bipolar Transistor Arrays

Package:: 8-DIP (0.300", 7.62mm)

Datasheet:: STD815CP40.pdf

Description:: TRANS NPN/PNP 400V 1.5A 8DIP

Quantity:: RFQ Add To RFQ list

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Inventory:2,549

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Product details

Overview

STD815CP40 from STMicroelectronics is a hybrid complementary NPN/PNP power bipolar transistor pair in a single DIP-8 package, rated for 400 V V_CEO (NPN) and 500 V V_CEO (PNP), with 1.5 A continuous collector current per device and low 0.5 V typical V_CE(sat) at I_C = 0.5 A / I_B = 0.1 A. It is engineered for high-speed switching in compact fluorescent lamp (CFL) ballast circuits operating directly from 220 V mains.

For engineers reviewing the STD815CP40 datasheet, STD815CP40 pinout, STD815CP40 application, or STD815CP40 equivalent, this dual-transistor solution simplifies CFL half-bridge inverter design by integrating matched NPN and PNP devices with separated terminals, reducing layout complexity and dynamic parameter spread across temperature.

Technical Context

The STD815CP40 implements a complementary high-voltage switching pair using ST's multi-epitaxial planar process, enabling 400 V/500 V blocking capability and fast switching with 100 ns rise time (resistive load) and 450 ns storage time (inductive load). Its dual-island DIP-8 structure isolates NPN and PNP die thermal and electrical paths to minimize cross-talk and ensure stable gain matching.

It operates with DC current gain (h_FE) of 10–34 across I_C = 10 mA to 1 A, supports pulsed collector currents up to 3 A, and maintains safe operating area (SOA) under reverse-biased conditions up to 300 V clamp voltage with 10 mH inductive load.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	400 V (NPN), 500 V (PNP): Enables direct operation from 220 V AC mains with margin for voltage spikes in CFL ballasts.
I_C (cont.)	1.5 A per transistor: Supports typical CFL lamp power levels up to ~30 W in half-bridge topology.
V_CE(sat)	0.5 V typ. @ I_C = 0.5 A, I_B = 0.1 A: Reduces conduction loss and thermal stress in high-duty-cycle switching.
h_FE	10–34 @ V_CE = 5 V: Provides predictable base drive requirements across operating current range.
t_r/t_s/t_f	100 ns / 2.2 µs / 0.2 µs (resistive); 450 ns / 80 ns (inductive): Ensures clean commutation in resonant CFL drivers.
R_thJC	2.7 °C/W (per transistor): Allows effective heat transfer to heatsink in compact enclosed CFL housings.

Pinout & Package

STD815CP40 uses a dual-island DIP-8 package with physically separated terminals for NPN and PNP transistors, enhancing assembly flexibility and minimizing parasitic coupling. The package conforms to ECOPACK® environmental standards and features 2.54 mm lead pitch.

Pin/Terminal	Circuit Role	Design Meaning
1 (NPN E)	NPN emitter	Low-side return path for NPN switch; electrically isolated from PNP emitter.
2 (NPN B)	NPN base	Control input for NPN transistor; requires ~0.1 A peak drive for full saturation.
3 (NPN C)	NPN collector	High-voltage output node; rated for 400 V blocking with 3 A pulsed capability.
4 (NC)	No connect	Internal isolation barrier; not bonded or used in circuit.
5 (PNP C)	PNP collector	High-voltage output node; rated for 500 V blocking, complementary to NPN collector.
6 (PNP B)	PNP base	Control input for PNP transistor; driven with negative current relative to emitter.
7 (PNP E)	PNP emitter	High-side return path; referenced to bus voltage, isolated from NPN emitter.
8 (NC)	No connect	Internal isolation barrier; no internal connection or function.

Key Features

Feature	Design Value
Complementary NPN/PNP pairing	Matched dynamic parameters (t_r, t_s, h_FE) reduce timing skew and improve half-bridge symmetry in CFL inverters.
Low V_CE(sat)	0.5 V typical enables <1 W conduction loss per transistor at 0.5 A, critical for thermally constrained lamp bases.
Dual-island DIP-8	Electrically and thermally isolated die islands prevent crosstalk and allow independent heatsinking paths.
High-voltage SOA	Reverse-biased SOA validated to 300 V clamp with 10 mH inductance ensures robustness during lamp ignition transients.

Applications

Compact Fluorescent Lamp (CFL) Ballast

Electronic Ballast for T5/T8 Lamps

Use Scenario: Half-bridge resonant inverter driving 18–36 W CFL tubes directly from 220 V AC mains.

IC Role / Device Role / Timing Role: Complementary switching pair controlling resonant tank current direction and zero-voltage switching timing.

Use Value: Eliminates discrete transistor matching effort and reduces PCB area by 40% vs. two separate TO-220 devices.

Use Scenario: High-efficiency electronic ballast for linear fluorescent lamps in commercial lighting fixtures.

IC Role / Device Role / Timing Role: Synchronized high-voltage switching element in push-pull topology with precise dead-time control.

Use Value: Maintains <±5% current regulation across line voltage variations due to tight h_FE and V_CE(sat) matching.

LED Driver with HV Buck-Boost Stage

AC-DC Adapter Auxiliary Switch

Use Scenario: High-side switch in buck-boost LED driver stage accepting 176–264 V AC input for constant-current street lighting.

IC Role / Device Role / Timing Role: PNP-controlled high-side switch enabling efficient step-up/step-down conversion without floating gate driver.

Use Value: Leverages 500 V PNP V_CEO rating to avoid external voltage clamping components.

Use Scenario: Auxiliary high-voltage switch in offline SMPS standby circuitry for TV or monitor power supplies.

IC Role / Device Role / Timing Role: Low-duty-cycle NPN switch regulating auxiliary winding feedback during light-load conditions.

Use Value: Uses 400 V V_CEO and 1.5 A I_C to replace discrete MOSFET + Zener clamp, cutting BOM count by 3 parts.

Equivalent & Alternatives

The following parts are listed as comparable options for similar complementary high-voltage bipolar switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BDX53C/BDX54C	Discrete TO-126 pair; no integrated thermal isolation, higher V_CE(sat) (1.5 V min), slower switching (t_r > 500 ns).	Requires separate mounting and base drive isolation; unsuitable for space-constrained CFL modules.	Select only when board-level layout allows discrete placement and thermal management overhead.
STGD10NB60KD	Single 600 V N-channel MOSFET in TO-252; no PNP complement, gate-driven, R_DS(on) = 0.6 Ω.	Cannot implement true complementary switching without external P-channel or level-shifting; higher gate charge.	Preferable only in new designs where MOSFET gate drive infrastructure exists and unidirectional switching suffices.

Compared with BDX53C/BDX54C and STGD10NB60KD, STD815CP40 uniquely delivers matched complementary switching, integrated thermal separation, and sub-1 V saturation in one DIP-8 footprint-enabling compact, low-component-count CFL ballasts without redesigning drive or layout.

Availability

STD815CP40 is available at Aetrix Electronics and suitable for compact fluorescent lamp (CFL) ballasts, electronic lighting ballasts, and high-voltage auxiliary switching applications requiring stable component supply and long-term industrial availability.

Supply support for STD815CP40 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, digital, and mixed-signal ICs, power transistors, and microcontrollers for industrial, automotive, and consumer markets.

STD815CP40 belongs to ST's high-voltage bipolar transistor product line, developed specifically to enable compact, reliable, and cost-effective electronic ballast solutions for energy-efficient lighting systems.

FAQ

Is STD815CP40 RoHS-compliant and halogen-free?

Yes. STD815CP40 is manufactured in an ECOPACK®-compliant DIP-8 package meeting RoHS Directive 2011/65/EU and EU REACH Regulation (EC) No. 1907/2006. Halogen content is below threshold limits per IEC 61249-2-21, confirmed in ST's official material declaration (Doc ID: CD00245715).

Can STD815CP40 be used in avalanche mode?

No. STD815CP40 is not rated or characterized for repetitive avalanche operation. Its Safe Operating Area (SOA) curves (Figures 19–20) define limits only under forward-biased and reverse-biased switching conditions-not unclamped inductive switching. Use external clamping (e.g., TVS or RCD snubber) for inductive loads.

What is the maximum allowable case temperature during continuous operation?

The maximum case temperature is 150 °C, aligned with its 150 °C maximum junction temperature (T_J) and 2.7 °C/W junction-to-case thermal resistance. At full 1.5 A I_C, derating begins above 100 °C case temperature per Figure 6 (Derating curve), requiring heatsinking or reduced duty cycle above that point.

Are pins 4 and 8 internally connected or grounded?

No. Pins 4 and 8 are true no-connect (NC) terminals - neither bonded nor electrically tied to any internal structure. They serve solely as mechanical isolation barriers between the NPN and PNP die islands and must remain unconnected in PCB layout.

STD815CP40 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: 1 NPN, 1 PNP

Current - Collector (Ic) (Max):: 1.5A

Voltage - Collector Emitter Breakdown (Max):: 400V

Vce Saturation (Max) @ Ib, Ic:: 1V @ 50mA, 350mA

Current - Collector Cutoff (Max):: 1mA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 16 @ 350mA, 5V

Power - Max:: 2.6W

Frequency - Transition:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 8-DIP

STD815CP40 FAQ

1.How can I place an order for STD815CP40 through Aetrix?

Please submit a Request for Quotation (RFQ) for STD815CP40 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 STD815CP40 reliable?

The price and inventory of STD815CP40 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STD815CP40 is usually 5 days.

3.What payment methods are accepted for STD815CP40?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STD815CP40 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STD815CP40?

STD815CP40 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STD815CP40 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 STD815CP40?

For technical support, including STD815CP40 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STD815CP40 requirements.

6.How does Aetrix verify that STD815CP40 is sourced from the original manufacturer or authorized distributors?

All STD815CP40 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 STD815CP40 meets industry standards.

7.What is the process for return or replacement of STD815CP40?

All STD815CP40 units undergo pre-shipment inspection (PSI). If there is an issue with STD815CP40, 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 STD815CP40 part is unused and in its original packaging.

Return procedure for STD815CP40:

1.Submit a request within 90 days.

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

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