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

STMicroelectronics 2STR1230

Name: 2STR1230
Brand: STMicroelectronics
SKU: 2STR1230
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2STR1230

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

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

Datasheet:: 2STR1230.pdf

Description:: TRANS NPN 30V 1.5A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Inventory:7,232

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Product details

Overview

2STR1230 from STMicroelectronics is a low-voltage, fast-switching NPN power transistor fabricated with PB-HCD (Power Bipolar High Current Density) technology. It delivers V_CE(sat) = 0.15 V at I_C = 1 A / I_B = 100 mA, h_FE = 130–560 (I_C = 0.5–2 A), 30 V V_CEO, and 70 ns turn-on time - enabling high-efficiency switching in compact DC-DC converters and LED drivers.

For engineers reviewing the 2STR1230 datasheet, 2STR1230 pinout, 2STR1230 application, or 2STR1230 equivalent, key selection criteria include its SOT-23 package footprint, low saturation voltage under high current, gain stability across temperature, and complementary pairing with 2STR2230 for push-pull topologies.

Technical Context

This NPN bipolar junction transistor operates as a medium-current, low-V_CE(sat) switch in linear and saturated modes. Its PB-HCD process enables high current density (I_C = 1.5 A continuous, 3 A pulsed) while maintaining tight V_CE(sat) tolerance and robust thermal performance (R_thJA = 250 °C/W on 1 cm² PCB).

Designed for surface-mount use in space-constrained power stages, it supports resistive-load switching with t_on/t_off = 70/380 ns at I_C = 1.5 A, V_CC = 10 V, and ±150 mA base drive - suitable for fixed-frequency PWM control in non-isolated buck regulators and LED current switches.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	30 V - Supports operation in 24 V rail systems with margin against transients
I_C (cont.)	1.5 A - Enables direct drive of medium-power LEDs or small solenoids without external buffering
V_CE(sat)	0.15 V @ 1 A/100 mA - Reduces conduction loss to ≤150 mW, critical for thermally limited SOT-23 layouts
h_FE	130–560 @ I_C = 0.5–2 A - Ensures stable base drive design across load range without gain collapse
t_on/t_off	70/380 ns - Allows switching up to ~1 MHz in non-critical timing applications with minimal overlap loss
R_thJA	250 °C/W - Requires minimal copper area (1 cm²) for safe 0.5 W dissipation at T_amb = 25 °C
C_CB	5 pF @ V_CB = 10 V - Limits Miller effect in high-dV/dt gate-drive interfaces

Pinout & Package

SOT-23 plastic surface-mount package: 3-pin, gull-wing leads, JEDEC TO-236AB compliant. Dimensions per Doc ID 12555 Rev 3: L = 0.6 mm, e = 0.85–1.05 mm, e1 = 1.7–2.1 mm, E = 1.2–1.6 mm.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Connected to ground or low-side return path; lowest impedance node for heat sinking via PCB copper
2 (Base)	Control input	Receives TTL/CMOS-compatible drive; requires ≥100 mA peak for full saturation at 1 A collector current
3 (Collector)	Current source terminal	Connected to load supply rail; carries full switched current and must route away from sensitive analog traces

Key Features

Feature	Design Value
Low V_CE(sat)	0.15 V at 1 A ensures <150 mW conduction loss - extends thermal headroom in dense layouts
High h_FE bandwidth	h_FE ≥130 up to 2 A enables single-stage base drive without Darlington stacking
Fast t_on	70 ns allows clean edge definition in 500 kHz–1 MHz PWM dimming and regulation loops
ECOPACK®2 compliance	Meets RoHS and halogen-free requirements without derating - qualified for consumer and industrial end equipment

Applications

LED Driver Stage

DC-DC Converter Switch

Use Scenario: Constant-current switching for white LED strings in mobile backlight and indicator modules.

IC Role / Device Role / Timing Role: Low-side NPN switch controlling LED cathode current with PWM dimming at 1–10 kHz.

Use Value: 0.15 V V_CE(sat) minimizes forward voltage drop, preserving >95% of supply headroom for LED string compliance.

Use Scenario: Main power switch in non-synchronous buck converter for 5 V → 3.3 V point-of-load regulation.

IC Role / Device Role / Timing Role: Saturated-mode switch operating at 500 kHz with fixed duty cycle and external freewheeling diode.

Use Value: 70 ns t_on and 380 ns t_off limit dead-time losses while maintaining efficiency >88% at 1 A output.

Hard Disk Drive Actuator

Mobile Equipment Voltage Regulator

Use Scenario: Current driver for voice coil motor (VCM) positioning in 2.5″ HDD head actuation circuits.

IC Role / Device Role / Timing Role: Precision current sink delivering bidirectional 0.5–1.2 A pulses under DAC-controlled base bias.

Use Value: Tight h_FE spread (130–560) and low V_CE(sat) variation ensure repeatable current accuracy across temperature.

Use Scenario: Linear pass element in low-noise LDO pre-regulator for RF front-end power domains.

IC Role / Device Role / Timing Role: Medium-current series pass transistor with emitter-follower configuration and local feedback.

Use Value: 30 V V_CEO and 150 °C T_J(max) support wide-input (12–24 V) operation with safe SOA margins.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT4401	V_CE(sat) = 0.75 V @ 150 mA - 5× higher than 2STR1230 at same current; h_FE drops sharply above 500 mA	Rated only for ≤200 mA continuous - unsuitable for 1 A LED or converter loads	Select only for low-current signal switching where gain linearity matters more than power efficiency
ZTX851	Higher V_CE(sat) = 0.5 V @ 1 A; R_thJA = 300 °C/W - 20% worse thermal resistance in SOT-23	Same 30 V rating but lower f_T limits usable frequency to <300 kHz	Acceptable for slower, thermally relaxed designs; avoid in high-duty-cycle or ambient >60 °C environments

Compared with MMBT4401 and ZTX851, the 2STR1230 uniquely combines sub-0.2 V saturation, 1.5 A current capability, and 70 ns switching in SOT-23 - making it the only choice for thermally constrained, medium-power switching where both efficiency and footprint are critical.

Availability

2STR1230 is available at Aetrix Electronics and suitable for LED driver modules, motherboard power management, and mobile equipment DC-DC converters requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for 2STR1230 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 microcontrollers, power transistors, sensors, and analog ICs for industrial, automotive, and consumer markets.

The 2STR1230 belongs to ST's "Low-Voltage Power Bipolar" product line, engineered specifically for high-efficiency, surface-mount switching in space-limited power conversion and lighting applications.

FAQ

Is the 2STR1230 pin-compatible with standard SOT-23 NPN transistors like BC817?

No. While both use SOT-23 packages, the 2STR1230 has emitter-base-collector pinout (1-E, 2-B, 3-C), whereas BC817 uses emitter-collector-base (1-E, 2-C, 3-B). Incorrect PCB layout will cause functional failure. Always verify pin assignment using Figure 1 in Doc ID 12555 Rev 3.

Can the 2STR1230 replace a MOSFET in a 1 A DC-DC converter switch?

Only if gate drive capability and switching frequency allow. The 2STR1230 requires ≥100 mA base current for full saturation at 1 A, unlike MOSFETs with capacitive gate drive. Its 380 ns t_off limits practical operation to ≤1 MHz, and conduction loss is lower than most logic-level MOSFETs in this package - but switching loss is higher due to minority-carrier storage.

What is the maximum allowable PCB copper area for thermal relief when using the 2STR1230 at 1.5 A?

Per Table 3, R_thJA = 250 °C/W assumes 1 cm² of 1 oz copper connected to the emitter pad. At I_C = 1.5 A and V_CE(sat) ≈ 0.4 V, power dissipation is ~0.6 W. To keep T_J ≤ 125 °C at T_amb = 60 °C, minimum copper area is 1.2 cm² - achieved by extending the emitter pad to adjacent layers via thermal vias.

Does the ECOPACK®2 grade affect electrical performance?

No. The "G" suffix (e.g., 2STR1230G) denotes halogen-free, RoHS-compliant molding compound and lead finish - identical electrical specs, thermal behavior, and reliability to the standard 2STR1230. The only difference is environmental compliance; no derating or design change is required.

2STR1230 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

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

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

Vce Saturation (Max) @ Ib, Ic:: 850mV @ 200mA, 2A

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 180 @ 500mA, 2V

Power - Max:: 500 mW

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

2STR1230 FAQ

1.How can I place an order for 2STR1230 through Aetrix?

Please submit a Request for Quotation (RFQ) for 2STR1230 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 2STR1230 reliable?

The price and inventory of 2STR1230 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2STR1230 is usually 5 days.

3.What payment methods are accepted for 2STR1230?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2STR1230 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2STR1230?

2STR1230 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2STR1230 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 2STR1230?

For technical support, including 2STR1230 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2STR1230 requirements.

6.How does Aetrix verify that 2STR1230 is sourced from the original manufacturer or authorized distributors?

All 2STR1230 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 2STR1230 meets industry standards.

7.What is the process for return or replacement of 2STR1230?

All 2STR1230 units undergo pre-shipment inspection (PSI). If there is an issue with 2STR1230, 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 2STR1230 part is unused and in its original packaging.

Return procedure for 2STR1230:

1.Submit a request within 90 days.

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

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