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Diodes Incorporated ZTX790AQSTZ
- Part No.:
- ZTX790AQSTZ
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX790AQSTZ.pdf
- Description:
- TRANS PNP 40V 2A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:3,489
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Product details
Overview
ZTX790AQSTZ from Diodes Incorporated is a PNP silicon planar medium-power high-gain bipolar junction transistor (BJT) with VCEO = −40 V, hFE = 200 at IC = −1 A, and VCE(sat) = −0.45 V at IC = −1 A / IB = −10 mA; used in siren drivers, Darlington pair stages, and battery-powered motor control circuits.
For engineers reviewing the ZTX790AQSTZ datasheet, ZTX790AQSTZ pinout, ZTX790AQSTZ application, or ZTX790AQSTZ equivalent, key selection criteria include verified PNP switching gain linearity at 1 A, low saturation voltage under pulsed load conditions, thermal resistance of 116 °C/W on 1-inch² PCB copper, and TO-92-compatible E-Line package compatibility with legacy footprint designs.
Technical Context
This device operates as a medium-power PNP BJT optimized for linear amplification and saturated switching in DC-coupled driver stages. It delivers hFE ≥ 150 at IC = −2 A and maintains VCE(sat) ≤ −0.75 V up to IC = −2 A with IB = −50 mA, supporting robust current sourcing in emitter-follower configurations.
Its fT = 100 MHz at IC = −50 mA / VCE = −5 V enables use in audio-frequency switching and fast-turn-off applications such as alarm tone generation; Cibo = 225 pF and Cobo = 24 pF confirm suitability for moderate-speed digital interface buffering where Miller capacitance must be controlled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −40 V - Maximum safe collector-emitter reverse bias before breakdown in common-emitter configuration. |
| hFE @ IC = −1 A | 200 - Confirmed DC current gain enabling 10 mA base drive to switch 1 A load reliably. |
| VCE(sat) @ IC = −1 A | −0.45 V - Low saturation voltage minimizes power loss and heat rise in battery-powered motor drivers. |
| fT | 100 MHz - Transition frequency supports stable operation up to audio band switching without gain roll-off. |
| Ptot @ Tamb = 25°C | 1.5 W - Practical dissipation limit on standard PCB layout; derates 5.7 mW/°C above ambient. |
| Rth(j–amb) (PCB) | 116 °C/W - Thermal resistance measured on 1-inch² copper pad; defines junction-to-ambient temperature rise per watt. |
| toff | 600 ns - Measured turn-off time under IB1/IB2 = −50 mA, confirming suitability for <1 kHz siren tone burst control. |
Pinout & Package
Package: TO-92 compatible E-Line (3-lead plastic), lead-forming option QSTZ denotes straight leads, tape-and-reel packaging for automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current sink terminal in PNP configuration | Connected to system ground or low-side return path; carries full load current in common-emitter switch mode. |
| Base (B) | Control input for minority-carrier injection | Receives negative-going drive signal; requires ≥10 mA sink capability for full saturation at 1 A collector current. |
| Collector (C) | High-side current source node | Connected to positive rail via load; reverse-biased during off-state to withstand −40 V transient spikes. |
Key Features
| Feature | Design Value |
|---|---|
| High hFE linearity across 10 mA–2 A range | Enables single-transistor current amplification without external feedback, reducing component count in discrete driver stages. |
| Low VCE(sat) at high IC | Reduces conduction loss to <0.5 W at 1 A, critical for thermally constrained battery-powered enclosures. |
| TO-92 footprint compatibility | Direct replacement for legacy ZTX750/ZTX790 series in existing PCBs without layout revision. |
| Extended Tj rating (−55°C to +200°C) | Supports operation in automotive engine bay or industrial motor controller environments with minimal derating. |
| Controlled Cibo/Cobo ratio | 225 pF / 24 pF ratio limits Miller effect during switching, improving stability in capacitive-load interfaces. |
Applications
| Siren Tone Generator | Darlington Base Driver |
|---|---|
Use Scenario: Generates audible 500 Hz–2 kHz alarm tones using astable multivibrator topology with passive RC timing. IC Role / Device Role / Timing Role: PNP switch controlling speaker coil current in emitter-follower output stage. Use Value: 600 ns toff ensures clean square-wave edge fidelity; −0.45 V VCE(sat) prevents thermal runaway during repetitive 100 ms bursts. | Use Scenario: Drives base of high-current NPN power transistor (e.g., TIP31C) in linear regulator or motor H-bridge half-bridge. IC Role / Device Role / Timing Role: Medium-gain current amplifier providing >100 mA base drive while isolating logic-level control signals. Use Value: hFE ≥ 200 at IC = −1 A eliminates need for multi-stage buffering; TO-92 footprint simplifies layout integration. |
| Battery-Powered Motor Control | Low-Voltage Load Switch |
Use Scenario: Enables/disables 12 V DC brushed motors in portable tools or medical pumps using microcontroller GPIO. IC Role / Device Role / Timing Role: Saturated PNP switch in high-side configuration, sourcing current to motor winding. Use Value: −40 V VCEO withstands inductive kickback; 1.5 W Ptot allows continuous 800 mA operation with 25°C ambient. | Use Scenario: Replaces mechanical switch in 5–24 V IoT sensor node power rails to enable remote wake-up and sleep-mode isolation. IC Role / Device Role / Timing Role: Low-leakage (ICBO ≤ −0.1 µA) PNP pass element controlling supply to peripheral ICs. Use Value: VBE(on) = −0.75 V ensures reliable turn-on with 3.3 V MCU outputs; −5 V VEBO rating protects against reverse-bias faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP medium-power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX750A | VCEO = −60 V, hFE = 100 @ IC = −1 A, higher VCE(sat) (−0.6 V) | Better overvoltage margin but lower gain and higher conduction loss | Select when system transients exceed −40 V but gain requirements are relaxed. |
| MJD2955T4G | TO-220 package, Ptot = 115 W, hFE = 20–70 @ IC = −4 A | Higher power handling but requires heatsink and larger board area | Select only when continuous IC > 2 A or ambient > 70°C is required. |
Compared with ZTX750A, ZTX790AQSTZ offers 100% higher gain at 1 A and 30% lower saturation voltage, improving efficiency in compact battery systems; versus MJD2955T4G, it trades raw power for PCB space savings and faster switching-ideal for cost-sensitive, size-constrained consumer electronics.
Availability
ZTX790AQSTZ is available at Aetrix Electronics and suitable for siren tone generators, Darlington base drivers, and battery-powered motor control circuits requiring stable component supply across production lifecycles.
Supply support for ZTX790AQSTZ 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for industrial, computing, and consumer markets.
ZTX790AQSTZ belongs to the ZTX series of medium-power BJTs designed specifically for cost-effective, high-gain discrete switching in space-constrained power management and audio-signal interface applications.
FAQ
Is ZTX790AQSTZ RoHS compliant and halogen-free?
Yes, ZTX790AQSTZ meets RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21. The TO-92 package uses matte tin lead finish and green molding compound, with full compliance documentation available through Diodes Incorporated's product change notifications.
What is the maximum safe operating current for continuous DC use?
The absolute maximum continuous collector current is −2 A, but practical DC operation is limited to −800 mA at Tamb = 25°C due to thermal constraints. At this current, junction temperature remains below 125°C with 1-inch² copper, satisfying long-term reliability requirements for industrial control modules.
Can ZTX790AQSTZ replace ZTX790A in existing designs?
Yes-ZTX790AQSTZ is a direct form-fit-function replacement for ZTX790A, sharing identical electrical specifications, TO-92 E-Line package dimensions, and pinout (E-B-C). The "QSTZ" suffix indicates straight leads and tape-and-reel packaging; no schematic or layout changes are needed.
Does it require a base resistor in switching applications?
Yes-a base resistor is mandatory to limit IB and ensure saturation. For 1 A collector current, a 470 Ω resistor between 3.3 V MCU output and base yields ~6.8 mA IB, satisfying the IC/IB = 10–20 rule for reliable saturation while avoiding excessive base drive loss.
ZTX790AQSTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- E-Line-3, Formed Leads
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 2 A
- Voltage - Collector Emitter Breakdown (Max):
- 40 V
- Vce Saturation (Max) @ Ib, Ic:
- 750mV @ 50mA, 2A
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 300 @ 10mA, 2V
- Power - Max:
- 1 W
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -55°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- E-Line (TO-92 compatible)
ZTX790AQSTZ FAQ
1.How can I place an order for ZTX790AQSTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX790AQSTZ 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 ZTX790AQSTZ reliable?
The price and inventory of ZTX790AQSTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX790AQSTZ is usually 5 days.
3.What payment methods are accepted for ZTX790AQSTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX790AQSTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX790AQSTZ?
ZTX790AQSTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX790AQSTZ 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 ZTX790AQSTZ?
For technical support, including ZTX790AQSTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX790AQSTZ requirements.
6.How does Aetrix verify that ZTX790AQSTZ is sourced from the original manufacturer or authorized distributors?
All ZTX790AQSTZ 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 ZTX790AQSTZ meets industry standards.
7.What is the process for return or replacement of ZTX790AQSTZ?
All ZTX790AQSTZ units undergo pre-shipment inspection (PSI). If there is an issue with ZTX790AQSTZ, 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 ZTX790AQSTZ part is unused and in its original packaging.
Return procedure for ZTX790AQSTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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