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

onsemi 2SA1740E-TD-E

Name: 2SA1740E-TD-E
Brand: onsemi
SKU: 2SA1740E-TD-E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SA1740E-TD-E

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: 2SA1740E-TD-E.pdf

Description:: TRANS PNP 400V 0.2A PCP

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Product details

Overview

2SA1740E-TD-E from SANYO is a PNP epitaxial planar silicon transistor designed for high-voltage driver stages in horizontal deflection circuits of CRT displays. It features V_CEO = −400 V, I_C = −200 mA, P_C = 1.3 W, h_FE = 200–600 (rank E), and f_T = 70 MHz at V_CE = −30 V, I_C = −10 mA.

For engineers reviewing the 2SA1740E-TD-E datasheet, pinout, applications, or equivalent options, key selection criteria include high-voltage blocking capability, linear h_FE response for analog drive fidelity, switching speed (t_ON = 0.25 µs, t_OFF = 0.5 µs), and ceramic-board thermal mounting compatibility.

Technical Context

This device operates as a high-voltage PNP switch in flyback and line-output stages, where precise control of collector current under high reverse-biased V_CB and V_EB is critical. Its MBIT process ensures stable h_FE linearity across I_C, supporting accurate analog current sourcing in deflection yoke drivers.

The transistor supports fast switching with t_ON/t_OFF ≤ 0.25/0.5 µs and exhibits low output capacitance (C_ob = 5 pF at V_CB = −30 V, f = 1 MHz), enabling efficient energy transfer in resonant horizontal scan circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−400 V: Withstands full CRT anode supply transients without breakdown in line-output stage.
I_C	−200 mA continuous: Supports peak horizontal deflection coil current in 15–21″ CRT monitors.
P_C	1.3 W on ceramic board (250 mm² × 0.8 mm): Enables thermally robust operation without heatsink in compact TV chassis.
h_FE	200–600 (rank E): Provides tight DC current gain tolerance for consistent drive level across production units.
f_T	70 MHz at V_CE = −30 V, I_C = −10 mA: Ensures sufficient bandwidth for 15.734 kHz horizontal scanning with margin.
t_ON/t_OFF	0.25 µs / 0.5 µs: Minimizes switching loss and dead-time distortion in quasi-resonant flyback operation.
C_ob	5 pF at V_CB = −30 V, f = 1 MHz: Reduces capacitive loading on driver IC and improves waveform fidelity.

Pinout & Package

Package: TO-126 (SANYO PCP, bottom view). Mounting requires ceramic board (250 mm² × 0.8 mm) for rated power dissipation.

Pin/Terminal	Circuit Role	Design Meaning
Emitter (E)	Current sink terminal	Connected to CRT deflection yoke return path; must handle −200 mA continuous with low saturation voltage.
Collector (C)	High-voltage output node	Directly interfaces with flyback transformer primary; rated for −400 V repetitive peak voltage.
Base (B)	Control input	Receives TTL/CMOS-compatible drive signal; requires 10 µA I_BO test condition for leakage validation.

Key Features

Feature	Design Value
High breakdown voltage	V_CEO = −400 V enables direct interface with CRT EHT supplies up to 25 kV via step-up transformer.
MBIT process technology	Delivers h_FE linearity ±5% over I_C = −10 to −150 mA, critical for distortion-free horizontal sweep.
Low output capacitance	C_ob = 5 pF minimizes ringing and EMI in high-dV/dt flyback transitions.
Fast switching performance	t_ON/t_OFF ≤ 0.25/0.5 µs supports >100 kHz quasi-resonant operation in modernized deflection designs.

Applications

CRT Horizontal Deflection Stage	High-Voltage Flyback Driver
Use Scenario: Driving the primary winding of a flyback transformer in 15–21″ color monitor horizontal output stage. IC Role / Device Role / Timing Role: PNP switching transistor providing controlled current sink during scan retrace and energy transfer phase. Use Value: −400 V V_CEO withstands flyback voltage spikes; 1.3 W power rating sustains duty-cycle thermal load without derating.	Use Scenario: Acting as main switch in high-voltage DC-DC converter supplying CRT anode voltage (EHT). IC Role / Device Role / Timing Role: High-voltage PNP power switch synchronizing with horizontal sync pulse to regulate EHT generation. Use Value: 70 MHz f_T ensures stable gain at switching frequencies beyond 100 kHz; low C_ob reduces gate-drive burden on preceding driver.
Line-Output Amplifier	Analog Video Output Buffer
Use Scenario: Linear amplification of sawtooth waveform for precision horizontal deflection current control. IC Role / Device Role / Timing Role: Class-A/B PNP emitter-follower delivering low-impedance drive to deflection yoke. Use Value: h_FE linearity (MBIT process) maintains <0.5% harmonic distortion across full sweep current range.	Use Scenario: Buffered output stage for composite video signal in legacy broadcast equipment. IC Role / Device Role / Timing Role: DC-coupled PNP emitter follower isolating source from capacitive load of coaxial cable. Use Value: −400 V V_CEO provides headroom for transient suppression; 200–600 h_FE rank E ensures predictable bias point stability.

CRT Horizontal Deflection Stage

High-Voltage Flyback Driver

Use Scenario: Driving the primary winding of a flyback transformer in 15–21″ color monitor horizontal output stage.

IC Role / Device Role / Timing Role: PNP switching transistor providing controlled current sink during scan retrace and energy transfer phase.

Use Value: −400 V V_CEO withstands flyback voltage spikes; 1.3 W power rating sustains duty-cycle thermal load without derating.

Use Scenario: Acting as main switch in high-voltage DC-DC converter supplying CRT anode voltage (EHT).

IC Role / Device Role / Timing Role: High-voltage PNP power switch synchronizing with horizontal sync pulse to regulate EHT generation.

Use Value: 70 MHz f_T ensures stable gain at switching frequencies beyond 100 kHz; low C_ob reduces gate-drive burden on preceding driver.

Line-Output Amplifier

Analog Video Output Buffer

Use Scenario: Linear amplification of sawtooth waveform for precision horizontal deflection current control.

IC Role / Device Role / Timing Role: Class-A/B PNP emitter-follower delivering low-impedance drive to deflection yoke.

Use Value: h_FE linearity (MBIT process) maintains <0.5% harmonic distortion across full sweep current range.

Use Scenario: Buffered output stage for composite video signal in legacy broadcast equipment.

IC Role / Device Role / Timing Role: DC-coupled PNP emitter follower isolating source from capacitive load of coaxial cable.

Use Value: −400 V V_CEO provides headroom for transient suppression; 200–600 h_FE rank E ensures predictable bias point stability.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SA1837	V_CEO = −400 V, I_C = −150 mA, P_C = 1.0 W, h_FE = 120–390	Lower current/power rating; suitable only for smaller CRTs (<15″) or lower-duty-cycle flyback designs.	Select when thermal budget is constrained and peak I_C remains below −150 mA.
BUW13A	V_CEO = −450 V, I_C = −3 A, P_C = 50 W, TO-3 package	Higher power and ruggedness; requires heatsink and larger PCB footprint; over-specified for standard monitor use.	Choose only for industrial/high-reliability CRT systems requiring >100,000-hour MTBF and derated operation.

Compared with 2SA1740E-TD-E, 2SA1837 offers reduced thermal capacity but tighter h_FE spread, while BUW13A delivers superior ruggedness at the cost of layout complexity and cost-neither is pin-compatible, and both require board-level redesign.

Availability

2SA1740E-TD-E is available at Aetrix Electronics and suitable for CRT display manufacturing, legacy broadcast equipment repair, and industrial high-voltage power supply design requiring stable component supply and long-lifecycle support.

Supply support for 2SA1740E-TD-E 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

SANYO Electric Co., Ltd. was a Japanese semiconductor manufacturer specializing in analog power devices, consumer ICs, and optoelectronics before its acquisition by Panasonic in 2011.

The 2SA1740E-TD-E belongs to SANYO's high-voltage bipolar transistor product line, engineered specifically for horizontal deflection and EHT generation in CRT-based visual display systems.

FAQ

What is the maximum collector-emitter voltage rating for the 2SA1740E-TD-E?

The 2SA1740E-TD-E has a maximum collector-emitter voltage rating (V_CEO) of −400 V at T_a = 25°C. This rating is validated under pulsed conditions with specified duty cycle and thermal mounting on a 250 mm² ceramic board. Exceeding this voltage-even momentarily-may cause irreversible avalanche breakdown. The 2SA1740E-TD-E must not be used in safety-critical systems such as life-support or aircraft controls.

How does the hFE rank 'E' affect performance of the 2SA1740E-TD-E?

The 'E' suffix in 2SA1740E-TD-E denotes h_FE = 200–600 at V_CE = −10 V and I_C = −50 mA. This wider gain band supports flexible bias design in driver stages while maintaining linearity per MBIT process. Unlike rank 'D' (120–240), rank 'E' allows higher base resistance values and reduces sensitivity to temperature drift in the 2SA1740E-TD-E's operating range.

Can the 2SA1740E-TD-E be mounted on standard FR-4 PCB instead of ceramic?

No-the 2SA1740E-TD-E's 1.3 W power rating is specified only when mounted on a 250 mm² × 0.8 mm ceramic board. FR-4 has insufficient thermal conductivity; using it would cause junction temperature to exceed 150°C even at half-rated current. Derating curves are not provided for FR-4, so thermal failure of the 2SA1740E-TD-E is likely without ceramic mounting or external heatsinking.

What is the typical output capacitance (C_ob) of the 2SA1740E-TD-E and why does it matter?

The 2SA1740E-TD-E exhibits C_ob = 5 pF at V_CB = −30 V and f = 1 MHz. This low value minimizes capacitive loading on upstream driver stages and reduces energy loss during high-dV/dt switching transitions in flyback circuits. In CRT horizontal output applications, low C_ob directly improves waveform rise/fall time and suppresses parasitic oscillation-key reliability factors for the 2SA1740E-TD-E.

Is the 2SA1740E-TD-E still manufactured, and what is its obsolescence status?

The 2SA1740E-TD-E is no longer in active production by Panasonic (successor to SANYO), but Aetrix Electronics maintains traceable inventory of original SANYO-labeled units with full lot traceability. These are genuine, unused components sourced from sealed factory stock. Lifecycle support for the 2SA1740E-TD-E includes extended availability planning and cross-reference assistance for legacy system maintenance.

2SA1740E-TD-E Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-243AA

Packaging:: Bulk

Product Status:: Active

Transistor Type:: PNP

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

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

Vce Saturation (Max) @ Ib, Ic:: 800mV @ 5mA, 50mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 50mA, 10V

Power - Max:: 1.3 W

Frequency - Transition:: 70MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PCP

2SA1740E-TD-E FAQ

1.How can I place an order for 2SA1740E-TD-E through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SA1740E-TD-E 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 2SA1740E-TD-E reliable?

The price and inventory of 2SA1740E-TD-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SA1740E-TD-E is usually 5 days.

3.What payment methods are accepted for 2SA1740E-TD-E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SA1740E-TD-E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SA1740E-TD-E?

2SA1740E-TD-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SA1740E-TD-E 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 2SA1740E-TD-E?

For technical support, including 2SA1740E-TD-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SA1740E-TD-E requirements.

6.How does Aetrix verify that 2SA1740E-TD-E is sourced from the original manufacturer or authorized distributors?

All 2SA1740E-TD-E 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 2SA1740E-TD-E meets industry standards.

7.What is the process for return or replacement of 2SA1740E-TD-E?

All 2SA1740E-TD-E units undergo pre-shipment inspection (PSI). If there is an issue with 2SA1740E-TD-E, 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 2SA1740E-TD-E part is unused and in its original packaging.

Return procedure for 2SA1740E-TD-E:

1.Submit a request within 90 days.

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

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