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

Renesas 2SC2958-AZ

Name: 2SC2958-AZ
Brand: Renesas
SKU: 2SC2958-AZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SC2958-AZ

Manufacturer:: Renesas

Category:: Single Bipolar Transistors

Package:: 3-SSIP

Datasheet:: 2SC2958-AZ.pdf

Description:: TRANS NPN 140V 0.5A

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SC2958-AZ from NEC is an NPN silicon epitaxial transistor designed for low-frequency power amplification, with V_CEO = 140 V, I_C(DC) = 500 mA, P_T = 1.0 W, and f_T = 30–60 MHz - used in TV vertical deflection drive/output stages and audio output circuits.

For engineers reviewing the 2SC2958-AZ datasheet, 2SC2958-AZ pinout, 2SC2958-AZ application, or 2SC2958-AZ equivalent, key selection criteria include high-voltage switching capability (V_CEO = 140 V), pulse current handling (I_C(pulse) = 1.0 A), DC gain range (h_FE = 100–400), saturation voltage (V_CE(sat) ≤ 0.7 V), and complementary pairing with 2SA1221.

Technical Context

This discrete NPN bipolar junction transistor operates in linear and switching modes for low-frequency power amplification. Its epitaxial base structure supports stable h_FE across I_C = 100 mA (100–400) and enables reliable operation up to T_j = 150°C with V_CB_O = 160 V.

The device features low output capacitance (C_ob = 13–30 pF at 10 V), moderate gain-bandwidth product (f_T = 30–60 MHz), and defined saturation characteristics (V_CE(sat) = 0.32–0.7 V @ I_C = 1.0 A / I_B = 0.2 A), making it suitable for deflection and audio output stage design where thermal stability and voltage headroom are critical.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	140 V - supports high-voltage vertical deflection drive without breakdown
I_C(DC)	500 mA - continuous collector current rating for sustained audio output stage operation
P_T	1.0 W - total power dissipation limit at T_a = 25°C, requiring heatsinking above ~300 mW
h_FE	100–400 @ V_CE = 2.0 V, I_C = 100 mA - wide DC gain range enabling flexible bias design
f_T	30–60 MHz - sufficient bandwidth for low-frequency power amplification up to ~10 MHz
V_CE(sat)	0.32–0.7 V @ I_C = 1.0 A, I_B = 0.2 A - low saturation voltage reduces conduction loss in switching applications
C_ob	13–30 pF @ V_CB = 10 V - low output capacitance minimizes Miller effect in amplifier feedback paths

Pinout & Package

2SC2958-AZ is housed in a TO-92MOD (M8E) plastic package with 3 leads: emitter, base, collector - lead configuration matches standard TO-92 pinout (E-B-C, viewed from flat side with leads down).

Pin/Terminal	Circuit Role	Design Meaning
Emitter (E)	Current sink terminal	Reference node for bias network; connects to ground or low-impedance return path in common-emitter amplifiers
Base (B)	Control input	Receives drive current to modulate collector current; requires series resistor to limit I_B during saturation
Collector (C)	High-voltage output node	Connects to load (e.g., deflection yoke or audio transformer primary); rated for 140 V DC and 1.0 A pulsed

Key Features

Feature	Design Value
High V_CEO rating	140 V enables safe operation in TV vertical deflection circuits with flyback voltage spikes
Complementary pairing	Matched with 2SA1221 (PNP) for push-pull output stages requiring matched V_CEO and h_FE profiles
Pulsed current capability	1.0 A peak (PW ≤ 10 ms, duty ≤ 50%) supports transient load demands in deflection drive
Low V_CE(sat)	0.32 V min reduces power loss and heat generation in saturated switching mode
Stable h_FE classification	Marking "AZ" corresponds to h_FE = 200–400 (K grade), ensuring predictable gain in production designs

Applications

TV Vertical Deflection Output Stage	Audio Power Output Stage
Use Scenario: Driving vertical deflection yoke in CRT television sets with high-voltage flyback recovery. IC Role / Device Role / Timing Role: NPN power switch amplifying sawtooth waveform; handles repetitive 50/60 Hz pulses with 140 V V_CEO margin. Use Value: Reliable switching under high-voltage transients due to V_CB_O = 160 V and robust thermal rating (T_j = 150°C).	Use Scenario: Single-ended or push-pull audio output in portable radios and small amplifiers. IC Role / Device Role / Timing Role: Linear power amplifier delivering up to 500 mA DC to 8 Ω speaker loads. Use Value: Low V_CE(sat) (≤ 0.7 V) and h_FE ≥ 100 ensure efficient power transfer and stable bias over temperature.
Pin Cushion Correction Circuit	DC Motor Driver (Low-Speed)
Use Scenario: Dynamic geometry correction in CRT displays using parabolic current modulation. IC Role / Device Role / Timing Role: Current-controlled amplifier shaping deflection current waveform with precise linearity. Use Value: Tight h_FE tolerance (K-grade: 200–400) and low C_ob (13–30 pF) preserve signal fidelity at sub-MHz frequencies.	Use Scenario: On/off or PWM-controlled drive for small DC motors in consumer appliances. IC Role / Device Role / Timing Role: Medium-power switching transistor controlling motor current up to 500 mA continuous. Use Value: 1.0 W power rating and 1.0 A pulsed current support enable intermittent high-torque startup without thermal shutdown.

TV Vertical Deflection Output Stage

Audio Power Output Stage

Use Scenario: Driving vertical deflection yoke in CRT television sets with high-voltage flyback recovery.

IC Role / Device Role / Timing Role: NPN power switch amplifying sawtooth waveform; handles repetitive 50/60 Hz pulses with 140 V V_CEO margin.

Use Value: Reliable switching under high-voltage transients due to V_CB_O = 160 V and robust thermal rating (T_j = 150°C).

Use Scenario: Single-ended or push-pull audio output in portable radios and small amplifiers.

IC Role / Device Role / Timing Role: Linear power amplifier delivering up to 500 mA DC to 8 Ω speaker loads.

Use Value: Low V_CE(sat) (≤ 0.7 V) and h_FE ≥ 100 ensure efficient power transfer and stable bias over temperature.

Pin Cushion Correction Circuit

DC Motor Driver (Low-Speed)

Use Scenario: Dynamic geometry correction in CRT displays using parabolic current modulation.

IC Role / Device Role / Timing Role: Current-controlled amplifier shaping deflection current waveform with precise linearity.

Use Value: Tight h_FE tolerance (K-grade: 200–400) and low C_ob (13–30 pF) preserve signal fidelity at sub-MHz frequencies.

Use Scenario: On/off or PWM-controlled drive for small DC motors in consumer appliances.

IC Role / Device Role / Timing Role: Medium-power switching transistor controlling motor current up to 500 mA continuous.

Use Value: 1.0 W power rating and 1.0 A pulsed current support enable intermittent high-torque startup without thermal shutdown.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN low-frequency power transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SC2625	V_CEO = 120 V, I_C(DC) = 500 mA, f_T = 20 MHz - lower voltage rating and bandwidth	Not suitable for 140 V deflection circuits; limited to lower-voltage audio or driver stages	Select only when V_CEO margin < 20 V is acceptable and gain-bandwidth demand is reduced
2SC3807	V_CEO = 160 V, I_C(DC) = 1.5 A, P_T = 1.5 W - higher current/power but different h_FE profile (60–120)	Better for high-current deflection or industrial drivers; less optimal for precision gain-matched push-pull pairs	Prefer when higher I_C and P_T are required, but verify h_FE matching with complementary PNP

Compared with 2SC2625 and 2SC3807, the 2SC2958-AZ offers the optimal balance of 140 V V_CEO, 500 mA DC current, and K-grade h_FE (200–400) for CRT deflection and audio output where voltage margin and gain consistency are prioritized over raw power or bandwidth.

Availability

2SC2958-AZ is available at Aetrix Electronics and suitable for CRT television repair, legacy audio amplifier refurbishment, and industrial analog signal conditioning requiring stable component supply and long-lifecycle support.

Supply support for 2SC2958-AZ 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

NEC Corporation was a Japanese multinational electronics company known for semiconductor innovation, particularly in analog and power transistors for broadcast and consumer electronics before its semiconductor division became Renesas Electronics.

The 2SC2958-AZ belongs to NEC's legacy low-frequency power transistor family, engineered specifically for CRT television vertical deflection and audio output applications demanding high-voltage tolerance and thermal reliability.

FAQ

What is the maximum collector-emitter voltage rating for the 2SC2958-AZ?

The 2SC2958-AZ has a maximum collector-emitter voltage (V_CEO) rating of 140 V at T_a = 25°C. This rating ensures safe operation in high-voltage applications such as CRT vertical deflection circuits where flyback transients occur. Exceeding this voltage risks avalanche breakdown and permanent damage to the 2SC2958-AZ.

Is the 2SC2958-AZ pin-compatible with other TO-92 transistors like the 2N3904?

No, the 2SC2958-AZ is not pin-compatible with general-purpose transistors such as the 2N3904. While both use TO-92 packages, the 2SC2958-AZ is optimized for power amplification (500 mA, 140 V), whereas the 2N3904 is a small-signal device (200 mA, 40 V). Their pinouts differ: 2SC2958-AZ uses E-B-C (flat side view), while 2N3904 uses E-B-C but with incompatible voltage/current ratings - direct substitution would risk failure.

What does the "AZ" suffix indicate in the 2SC2958-AZ part number?

Per NEC's h_FE classification system, the "AZ" suffix identifies the 2SC2958-AZ as belonging to the K-grade group, meaning its DC current gain (h_FE) falls within 200–400 at V_CE = 2.0 V and I_C = 100 mA. This tighter gain band ensures consistent performance in production-critical applications like CRT deflection amplifiers where gain matching matters.

Can the 2SC2958-AZ be used in switching power supplies?

The 2SC2958-AZ is not recommended for modern switching power supplies. Its f_T (30–60 MHz) and switching speed are optimized for low-frequency (≤100 kHz) applications like TV deflection, not high-frequency SMPS operation. Additionally, its 1.0 W power dissipation and lack of fast recovery specs make it unsuitable for efficient high-frequency switching - use dedicated MOSFETs or RF transistors instead of the 2SC2958-AZ.

How does the 2SC2958-AZ compare to its complementary PNP counterpart 2SA1221?

The 2SC2958-AZ and 2SA1221 form a complementary pair with matched voltage ratings (V_CEO = 140 V), similar power dissipation (1.0 W), and compatible h_FE ranges - enabling balanced push-pull amplifier designs. The 2SA1221 provides symmetrical PNP behavior for current sinking, while the 2SC2958-AZ serves as the NPN current sourcing element, together supporting Class B or AB audio and deflection output stages.

2SC2958-AZ Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 3-SSIP

Packaging:: Bulk

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 500 mA

Voltage - Collector Emitter Breakdown (Max):: 140 V

Vce Saturation (Max) @ Ib, Ic:: 700mV @ 200mA, 1A

Current - Collector Cutoff (Max):: 200nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 100mA, 2V

Power - Max:: 1 W

Frequency - Transition:: 60MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: -

2SC2958-AZ FAQ

1.How can I place an order for 2SC2958-AZ through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SC2958-AZ 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 2SC2958-AZ reliable?

The price and inventory of 2SC2958-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SC2958-AZ is usually 5 days.

3.What payment methods are accepted for 2SC2958-AZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SC2958-AZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SC2958-AZ?

2SC2958-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SC2958-AZ 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 2SC2958-AZ?

For technical support, including 2SC2958-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SC2958-AZ requirements.

6.How does Aetrix verify that 2SC2958-AZ is sourced from the original manufacturer or authorized distributors?

All 2SC2958-AZ 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 2SC2958-AZ meets industry standards.

7.What is the process for return or replacement of 2SC2958-AZ?

All 2SC2958-AZ units undergo pre-shipment inspection (PSI). If there is an issue with 2SC2958-AZ, 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 2SC2958-AZ part is unused and in its original packaging.

Return procedure for 2SC2958-AZ:

1.Submit a request within 90 days.

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

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