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

Toshiba Semiconductor and Storage TTA1943(Q)

Name: TTA1943(Q)
Brand: Toshiba Semiconductor and Storage
SKU: TTA1943(Q)
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TTA1943(Q)

Manufacturer:: Toshiba Semiconductor and Storage

Category:: Single Bipolar Transistors

Package:: TO-3PL

Datasheet:: TTA1943(Q).pdf

Description:: TRANS PNP 230V 15A TO-3P

Quantity:: RFQ Add To RFQ list

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Product details

Overview

TTA1943(Q) from Toshiba is a silicon PNP epitaxial power transistor designed for high-voltage, high-current audio output stages. It delivers V_CEO = −230 V (min), I_C = −15 A, and P_C = 150 W at T_c = 25°C, with h_FE ≥ 80 at I_C = −1 A and f_T = 30 MHz (typ), and is recommended for 100-W high-fidelity audio amplifier output circuits.

For engineers reviewing the TTA1943(Q) datasheet, TTA1943(Q) pinout, TTA1943(Q) application, or TTA1943(Q) equivalent, key selection considerations include its complementary pairing with TTC5200, safe operating area under pulse and DC conditions, thermal resistance profile, and −230 V collector-emitter breakdown capability in Class-AB audio output topologies.

Technical Context

The TTA1943(Q) operates as a high-power PNP bipolar junction transistor in common-emitter configuration, optimized for linear amplification in audio frequency ranges up to several hundred kHz. Its design emphasizes high-voltage blocking (V_CBO = −230 V), low saturation voltage (V_CE(sat) ≤ −3.0 V at I_C = −8 A / I_B = −0.8 A), and stable DC current gain (h_FE = 35–160 across I_C = −1 A to −7 A).

It features a TO-3P (2-21F1A) metal package with collector connected to the heat sink tab, enabling direct mounting to heatsinks for thermal management. The device exhibits Cob = 240 pF at V_CB = −10 V and f = 1 MHz, supporting stable high-frequency operation when paired with appropriate base drive and compensation networks.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−230 V min: Enables use in high-voltage rail designs (±100 V supplies) without breakdown risk in audio output stage.
I_C	−15 A max: Supports peak output currents required for 100-W RMS into 4 Ω loads with headroom.
P_C	150 W at T_c = 25°C: Requires robust heatsinking; derates linearly above 25°C case temperature.
h_FE	80–160 @ I_C = −1 A; ≥35 @ I_C = −7 A: Ensures sufficient drive efficiency and linearity across full output swing.
f_T	30 MHz typ @ V_CE = −5 V, I_C = −1 A: Supports wide audio bandwidth and stable feedback loop compensation.
C_ob	240 pF @ V_CB = −10 V, f = 1 MHz: Impacts Miller effect and high-frequency stability in common-emitter amplifiers.
T_j max	150°C: Sets maximum allowable junction temperature; requires thermal design ensuring T_j ≤ 150°C under worst-case load.

Pinout & Package

Package: TO-3P (JEDEC-compatible, Toshiba designation 2-21F1A), metal case with collector electrically connected to the mounting tab/heat sink surface. Weight: 9.75 g (typ). Mounting requires insulating washer or mica pad when heatsink is grounded.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input terminal	Receives base current to modulate collector current; requires current-limited drive to avoid overdrive or thermal runaway.
2 (Collector)	Main power output terminal	Electrically tied to metal case/heatsink; must be isolated from chassis unless circuit ground is collector-referenced.
3 (Emitter)	Current return path	Serves as reference node for emitter-follower or common-emitter configurations; often connected to negative rail in push-pull output stages.

Key Features

Feature	Design Value
High-voltage PNP complement	Designed as direct complementary pair to TTC5200 (NPN), enabling symmetrical Class-AB audio output stages with matched V_CEO, I_C, and thermal profiles.
Robust SOA	Rated for continuous DC operation at 150 W (T_c = 25°C) and defined pulse SOA curves up to 100 ms, supporting dynamic audio transients without secondary breakdown.
Low V_CE(sat)	≤ −3.0 V at I_C = −8 A / I_B = −0.8 A: Minimizes conduction loss and improves efficiency in high-current output operation.
Stable h_FE vs. I_C	h_FE ≥ 35 at I_C = −7 A ensures predictable base drive requirements across full output range, reducing distortion in mid-to-high power regions.
High f_T / low C_ob	30 MHz f_T and 240 pF C_ob support stable wideband feedback and low phase shift in high-slew-rate audio amplifiers.

Applications

Hi-Fi Audio Amplifier Output Stage	Professional PA System Power Module
Use Scenario: Final output stage of discrete Class-AB stereo amplifier delivering 100 W RMS into 4–8 Ω loads with low THD and wide bandwidth. IC Role / Device Role / Timing Role: PNP power switching element in push-pull topology, conducting during negative half-cycle of audio waveform. Use Value: −230 V V_CEO and 150 W dissipation enable clean clipping margin and thermal resilience under sustained program material.	Use Scenario: High-power output section of 200–500 W professional loudspeaker amplifier used in live sound reinforcement systems. IC Role / Device Role / Timing Role: High-current PNP emitter follower or common-emitter driver in multi-stage output bank with parallel devices. Use Value: Matched h_FE and SOA with TTC5200 allows balanced current sharing and reliable operation under reactive speaker loads.
Studio Monitor Power Amplifier	Discrete Audio Reference Design
Use Scenario: Precision near-field studio monitor requiring ultra-low noise, minimal intermodulation distortion, and fast transient response. IC Role / Device Role / Timing Role: Linear output transistor biased in Class-A/AB for accurate signal reproduction without crossover distortion. Use Value: 30 MHz f_T and stable h_FE ensure faithful high-frequency extension and consistent gain across audible spectrum.	Use Scenario: Educational or prototyping platform demonstrating discrete BJT amplifier design principles and thermal management techniques. IC Role / Device Role / Timing Role: Primary PNP power device in hand-soldered through-hole reference circuit illustrating biasing, compensation, and heatsink interface. Use Value: TO-3P mechanical robustness and clearly documented SOA/thermal curves support practical learning of reliability-aware analog design.

Hi-Fi Audio Amplifier Output Stage

Professional PA System Power Module

Use Scenario: Final output stage of discrete Class-AB stereo amplifier delivering 100 W RMS into 4–8 Ω loads with low THD and wide bandwidth.

IC Role / Device Role / Timing Role: PNP power switching element in push-pull topology, conducting during negative half-cycle of audio waveform.

Use Value: −230 V V_CEO and 150 W dissipation enable clean clipping margin and thermal resilience under sustained program material.

Use Scenario: High-power output section of 200–500 W professional loudspeaker amplifier used in live sound reinforcement systems.

IC Role / Device Role / Timing Role: High-current PNP emitter follower or common-emitter driver in multi-stage output bank with parallel devices.

Use Value: Matched h_FE and SOA with TTC5200 allows balanced current sharing and reliable operation under reactive speaker loads.

Studio Monitor Power Amplifier

Discrete Audio Reference Design

Use Scenario: Precision near-field studio monitor requiring ultra-low noise, minimal intermodulation distortion, and fast transient response.

IC Role / Device Role / Timing Role: Linear output transistor biased in Class-A/AB for accurate signal reproduction without crossover distortion.

Use Value: 30 MHz f_T and stable h_FE ensure faithful high-frequency extension and consistent gain across audible spectrum.

Use Scenario: Educational or prototyping platform demonstrating discrete BJT amplifier design principles and thermal management techniques.

IC Role / Device Role / Timing Role: Primary PNP power device in hand-soldered through-hole reference circuit illustrating biasing, compensation, and heatsink interface.

Use Value: TO-3P mechanical robustness and clearly documented SOA/thermal curves support practical learning of reliability-aware analog design.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJE15034	V_CEO = −250 V, I_C = −8 A, P_C = 125 W, TO-247 package; lower current rating but higher voltage margin.	Preferred where higher voltage safety margin is prioritized over peak current delivery in lower-power (<80 W) designs.	Select MJE15034 when system rails exceed ±110 V or when TO-247 footprint compatibility is required.
2SA1943	Same die as TTA1943(Q) but in TO-3 case (not TO-3P); identical electrical specs, slightly different thermal resistance and mounting geometry.	Used in legacy amplifier designs with TO-3 socketing or mechanical constraints incompatible with TO-3P flange dimensions.	Choose 2SA1943 only for direct mechanical replacement in existing TO-3-based PCBs; otherwise TTA1943(Q) preferred for improved heatsink contact.

Compared with MJE15034 and 2SA1943, the TTA1943(Q) offers superior current handling (−15 A vs −8 A) and power dissipation (150 W vs 125 W) in a modern TO-3P package, while maintaining identical electrical performance to 2SA1943 - making it optimal for new 100-W audio designs requiring both thermal efficiency and layout flexibility.

Availability

TTA1943(Q) is available at Aetrix Electronics and suitable for high-fidelity audio amplifiers, professional PA systems, and studio monitor power modules requiring stable component supply, long-term manufacturability, and traceable sourcing.

Supply support for TTA1943(Q) 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

Toshiba Electronic Devices & Storage Corporation is a Japanese semiconductor manufacturer specializing in power devices, logic ICs, and memory solutions, with decades of leadership in discrete transistor technology.

The TTA1943(Q) belongs to Toshiba's high-power audio bipolar transistor family, engineered specifically for linear amplification in demanding analog audio output stages where reliability, voltage headroom, and thermal stability are critical.

FAQ

What is the package type and mounting configuration of the TTA1943(Q)?

The TTA1943(Q) uses a TO-3P (2-21F1A) metal package with the collector internally connected to the case. This requires electrical isolation from the heatsink using a mica washer or silicone pad unless the circuit design intentionally references the collector to chassis ground. The base and emitter leads are insulated pins accessible from the front side.

Is the TTA1943(Q) RoHS compliant?

Yes, the TTA1943(Q) is marked [[G]]/RoHS COMPATIBLE per Toshiba documentation dated 2013-11-01. It complies with Directive 2011/65/EU, containing lead-free terminations and meeting all restricted substance thresholds. Full compliance documentation is available through Toshiba's official environmental reports.

How does the TTA1943(Q) relate to the TTC5200?

The TTA1943(Q) is explicitly designated by Toshiba as complementary to the TTC5200 NPN transistor. They share matched absolute maximum ratings (V_CEO, I_C, P_C), similar h_FE ranges, and compatible thermal characteristics - enabling symmetrical push-pull output stages with minimized crossover distortion and balanced thermal stress in the TTA1943(Q)/TTC5200 pair.

What is the safe operating area (SOA) limitation for continuous DC operation of the TTA1943(Q)?

At T_c = 25°C, the TTA1943(Q) supports continuous DC operation up to 150 W. However, SOA must be derated linearly with increasing case temperature: at T_c = 100°C, maximum continuous power drops to approximately 75 W. Designers must verify junction temperature remains ≤150°C using measured T_c and r_th(j-c) from the datasheet.

Can the TTA1943(Q) be used in switching applications?

The TTA1943(Q) is characterized and qualified for linear audio amplification, not switching. While it can conduct in saturation, its f_T and stored charge parameters are not optimized for fast turn-off, and secondary breakdown limits make it unsuitable for hard-switching SMPS or motor drive H-bridges. For switching, Toshiba recommends dedicated IGBTs or MOSFETs instead of the TTA1943(Q).

TTA1943(Q) Specifications

Product attributes: Attribute value

Manufacturer:: Toshiba Semiconductor and Storage

Series:: -

Package/Case:: TO-3PL

Packaging:: Bulk

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 15 A

Voltage - Collector Emitter Breakdown (Max):: 230 V

Vce Saturation (Max) @ Ib, Ic:: 3V @ 800mA, 8A

Current - Collector Cutoff (Max):: 5µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 80 @ 1A, 5V

Power - Max:: 150 W

Frequency - Transition:: 30MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-3P(L)

TTA1943(Q) FAQ

1.How can I place an order for TTA1943(Q) through Aetrix?

Please submit a Request for Quotation (RFQ) for TTA1943(Q) 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 TTA1943(Q) reliable?

The price and inventory of TTA1943(Q) are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TTA1943(Q) is usually 5 days.

3.What payment methods are accepted for TTA1943(Q)?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TTA1943(Q) transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TTA1943(Q)?

TTA1943(Q) orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TTA1943(Q) 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 TTA1943(Q)?

For technical support, including TTA1943(Q) datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TTA1943(Q) requirements.

6.How does Aetrix verify that TTA1943(Q) is sourced from the original manufacturer or authorized distributors?

All TTA1943(Q) 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 TTA1943(Q) meets industry standards.

7.What is the process for return or replacement of TTA1943(Q)?

All TTA1943(Q) units undergo pre-shipment inspection (PSI). If there is an issue with TTA1943(Q), 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 TTA1943(Q) part is unused and in its original packaging.

Return procedure for TTA1943(Q):

1.Submit a request within 90 days.

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

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