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onsemi MJE4343
- Part No.:
- MJE4343
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-218-3
- Datasheet:
-
MJE4343.pdf
- Description:
- TRANS NPN 160V 16A SOT-93
- Quantity:
- Payment:
- Shipping:
Inventory:7,783
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Product details
Overview
MJE4343 from onsemi is an NPN high-voltage, high-power bipolar junction transistor designed for linear audio amplifier output stages and high-voltage DC-DC switching regulator switches. It delivers 16 A continuous collector current, sustains 160 Vdc collector-emitter voltage, and exhibits 35 (typ) DC current gain at 8.0 Adc - enabling robust operation in Class AB audio finals and flyback/forward converter primary switches.
For engineers reviewing the MJE4343 datasheet, pinout, applications, or equivalent options, key selection criteria include its 160 Vdc VCEO(sus), 125 W power dissipation at TC = 25 °C, TO-247 package thermal resistance of 1.0 °C/W, and verified safe operating area up to 160 V / 16 A under clamped reverse-bias conditions.
Technical Context
The MJE4343 operates as a silicon planar epitaxial NPN power transistor with complementary PNP pairing (MJE4353). Its structure supports high-voltage blocking (160 Vdc VCEO and VCB) while maintaining low saturation voltage (2.0 Vdc max at IC = 8.0 Adc, IB = 800 mA) and fast switching performance (fT = 1.0 MHz at IC = 1.0 Adc).
Thermal design centers on its 1.0 °C/W junction-to-case resistance and defined transient thermal response per Figure 9. Safe operation requires adherence to both forward-bias SOA (Figure 10) and reverse-bias SOA (Figure 11), particularly under inductive turn-off where VBE(off) ≤ 5 V must be maintained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO(sus) | 160 Vdc - Sustains full rated voltage during switching transitions without breakdown, critical for 100–150 V rail audio amplifiers and offline SMPS. |
| IC (Continuous) | 16 Adc - Supports high-current output stages without forced cooling; derates linearly above 25 °C ambient per Figure 1. |
| hFE (Typ) | 35 @ IC = 8.0 Adc - Enables stable biasing with moderate base drive; sufficient for direct driver stage interfacing. |
| VCE(sat) (Max) | 2.0 Vdc @ IC = 8.0 Adc, IB = 800 mA - Limits conduction loss to ≤16 W at full current, reducing heatsink requirements. |
| fT | 1.0 MHz @ IC = 1.0 Adc - Supports audio bandwidth and switching frequencies up to ~100 kHz with adequate gain margin. |
| RJC | 1.0 °C/W - Allows direct mounting to heatsinks; enables 125 W dissipation with ≤125 °C junction rise above case. |
| Cob | 800 pF @ VCB = 10 Vdc - Impacts high-frequency gain roll-off and snubber sizing in switching applications. |
Pinout & Package
Package: TO-247 (Case 340L, Style 3), Pb-free, with 4-terminal configuration optimized for high-current emitter/source routing and thermal path integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control input requiring ~800 mA drive at full current; low-impedance connection minimizes Miller effect during switching. |
| 2 | Collector | Main high-voltage, high-current output node; electrically and thermally connected to metal tab for heatsinking. |
| 3 | Emiter | Low-side current return path; dual emitter pins (3 and 4) reduce bond wire inductance and resistive drop. |
| 4 | Collector | Second collector terminal - paralleled with Pin 2 to halve current density and improve thermal distribution across die. |
Key Features
| Feature | Design Value |
|---|---|
| High sustaining voltage | 160 Vdc VCEO(sus) enables use in 120 VAC-derived supplies and high-rail audio without cascading devices. |
| Low saturation voltage | 2.0 Vdc max VCE(sat) reduces conduction loss by >30% vs. legacy 3–4 V devices at 8 A, improving efficiency in Class AB outputs. |
| Dual collector terminals | Pins 2 and 4 provide parallel current paths, lowering effective RDS(on)-like resistance and enhancing thermal symmetry. |
| Defined RBSOA | Reverse-bias SOA validated to 160 V / 16 A (Figure 11) ensures reliable turn-off into inductive loads when VBE(off) ≤ 5 V. |
| Pb-free construction | RoHS-compliant packaging meets industrial and consumer regulatory requirements without solderability compromise. |
Applications
| High-Fidelity Audio Amplifier Output Stage | Offline Switch-Mode Power Supply Switch |
|---|---|
|
Use Scenario: Final output device in discrete Class AB or Class G audio amplifiers delivering ≥100 W into 4–8 Ω loads from ±80 V rails. IC Role / Device Role / Timing Role: Linear power amplification element handling full audio-band signal swing and peak currents up to 16 A. Use Value: 160 Vdc VCEO(sus) prevents breakdown during clipping transients; 35 hFE ensures stable quiescent bias with minimal thermal drift. |
Use Scenario: Primary-side switch in 50–200 W flyback or forward converters operating directly from rectified 100–240 VAC inputs. IC Role / Device Role / Timing Role: High-voltage, high-current switching element turning on/off at 20–100 kHz with controlled dV/dt. Use Value: Validated RBSOA allows safe turn-off into transformer leakage inductance without snubber overdesign; 1.0 MHz fT supports clean gate drive. |
| Industrial Motor Drive Half-Bridge | Ultrasonic Generator Driver |
|
Use Scenario: Low-side switch in 3-phase IGBT gate driver auxiliary circuits or single-phase motor H-bridge inverters up to 1 kW. IC Role / Device Role / Timing Role: Fast-switching, high-current sink for PWM-controlled motor phase current commutation. Use Value: Dual collector terminals reduce localized heating during 10–20 kHz PWM; 800 pF Cob minimizes capacitive coupling noise in gate drive loops. |
Use Scenario: Push-pull output stage in 20–100 kHz ultrasonic cleaning or welding generators driving piezoelectric transducers. IC Role / Device Role / Timing Role: High-efficiency, high-voltage switching element delivering resonant tank current with minimal phase shift. Use Value: 160 Vdc rating accommodates reflected voltage spikes from reactive loads; 2.0 Vdc VCE(sat) maintains >92% efficiency at 10 A RMS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage NPN power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics TIP35C | Lower VCEO = 100 Vdc; higher VCE(sat) = 3.0 Vdc max; same TO-247 package and 25 A rating. | Not suitable for >100 V rail designs; requires larger heatsink due to higher conduction loss. | Select only if operating voltage ≤100 Vdc and cost sensitivity outweighs efficiency and voltage margin needs. |
| ON Semiconductor MJ15003G | Higher VCEO = 250 Vdc; lower hFE = 15–30; identical 16 A rating and TO-3 package (not TO-247). | Requires PCB layout change (TO-3 vs TO-247); better for ultra-high-voltage SMPS but less optimal for compact audio heatsinks. | Choose when 250 V blocking is mandatory and mechanical compatibility with TO-3 mounting is acceptable. |
Compared with MJE4343, TIP35C trades voltage headroom for marginal cost reduction, while MJ15003G offers superior voltage rating at the expense of gain and package compatibility - making MJE4343 the balanced choice for 120–160 V systems needing TO-247 thermal and layout advantages.
Availability
MJE4343 is available at Aetrix Electronics and suitable for high-fidelity audio amplifier output stages, offline switch-mode power supply switches, and industrial motor drive half-bridges requiring stable component supply, long-term lifecycle support, and traceable Pb-free sourcing.
Supply support for MJE4343 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MJE4343 belongs to onsemi's high-voltage power transistor family engineered for rugged linear and switching applications - specifically targeting audio amplification, industrial power conversion, and motor control where reliability at elevated voltage and current is essential.
FAQ
What is the maximum continuous collector current rating for the MJE4343?
The MJE4343 has a maximum continuous collector current (IC) rating of 16 Adc at TC = 25 °C. This rating decreases linearly with increasing case temperature, as shown in Figure 1 of the datasheet - for example, it drops to approximately 12 A at TC = 75 °C. The device also supports 20 Adc peak current under pulsed conditions (5.0 s pulse width, 10% duty cycle), making it suitable for short-duration overload scenarios in audio and SMPS applications.
Does the MJE4343 have a documented Reverse Bias Safe Operating Area (RBSOA)?
Yes, the MJE4343 includes a fully characterized Reverse Bias Safe Operating Area (RBSOA) shown in Figure 11 of the official datasheet. It is validated up to 160 Vdc and 16 Adc under clamped turn-off conditions with VBE(off) ≤ 5 V. This RBSOA specification confirms the device's ability to safely handle simultaneous high voltage and high current during inductive turn-off - a critical requirement for flyback transformers and motor drive inductive loads.
What package types are offered for the MJE4343, and which is currently active?
The MJE4343 is offered in two packages: SOT-93 (TO-218) and TO-247 (Case 340L). However, per Note on page 1 of the datasheet ("Effective June 2012 this device will be available only in the TO-247 package"), the TO-247 variant is the sole active and supported configuration. The SOT-93 version is obsolete and no longer manufactured or shipped by onsemi.
How does the MJE4343's DC current gain compare across temperature and current levels?
The MJE4343's DC current gain (hFE) varies with operating conditions: it is specified as 15–35 (min to typ) at IC = 8.0 Adc, VCE = 2.0 Vdc, and TC = 25 °C. Figure 6 shows hFE degrades with rising temperature - dropping to ~10 at TJ = 150 °C - and also decreases at higher currents, falling to 15 (typ) at IC = 16 Adc. Designers must account for this variation when setting base drive for stable bias across thermal and load ranges.
Is the MJE4343 pin-compatible with its complementary PNP counterpart MJE4353?
Yes, the MJE4343 (NPN) and MJE4353 (PNP) share identical TO-247 package pinouts: Pin 1 = Base, Pin 2 = Collector, Pin 3 = Emitter, Pin 4 = Collector. This symmetry enables direct complementary push-pull implementation in audio output stages and H-bridge configurations without layout modification - a key design advantage confirmed in the Marking Diagrams and Mechanical Outline sections of the datasheet.
MJE4343 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-218-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 16 A
- Voltage - Collector Emitter Breakdown (Max):
- 160 V
- Vce Saturation (Max) @ Ib, Ic:
- 3.5V @ 2A, 16A
- Current - Collector Cutoff (Max):
- 750µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 15 @ 8A, 2V
- Power - Max:
- 125 W
- Frequency - Transition:
- 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- SOT-93
MJE4343 FAQ
1.How can I place an order for MJE4343 through Aetrix?
Please submit a Request for Quotation (RFQ) for MJE4343 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 MJE4343 reliable?
The price and inventory of MJE4343 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJE4343 is usually 5 days.
3.What payment methods are accepted for MJE4343?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJE4343 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MJE4343?
MJE4343 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MJE4343 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 MJE4343?
For technical support, including MJE4343 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJE4343 requirements.
6.How does Aetrix verify that MJE4343 is sourced from the original manufacturer or authorized distributors?
All MJE4343 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 MJE4343 meets industry standards.
7.What is the process for return or replacement of MJE4343?
All MJE4343 units undergo pre-shipment inspection (PSI). If there is an issue with MJE4343, 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 MJE4343 part is unused and in its original packaging.
Return procedure for MJE4343:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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