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Diodes Incorporated ZTX605STZ
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- Part No.:
- ZTX605STZ
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX605STZ.pdf
- Description:
- TRANS NPN DARL 120V 1A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:7,969
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Product details
Overview
ZTX605STZ from Zetex Semiconductors (now Diodes Incorporated) is an NPN silicon planar medium-power Darlington transistor in TO-92 package, rated for 120 VCEO, 1 A continuous collector current, and 1 W power dissipation at 25°C ambient. It delivers hFE ≥2000 at IC = 1 A and exhibits VCE(sat) ≤1.5 V under same conditions-used in high-gain switching and linear amplification stages of industrial control interfaces.
For engineers reviewing the ZTX605STZ datasheet, ZTX605STZ pinout, ZTX605STZ application, or ZTX605STZ equivalent, key selection factors include verified Darlington gain stability at 1 A, low saturation voltage under forced β = 100 drive, thermal derating behavior above 25°C, and TO-92 mechanical compatibility with legacy board layouts.
Technical Context
This device implements a monolithic Darlington pair with integrated base-emitter resistor network optimized for DC-coupled switching. Its high hFE (2k–100k range across IC = 50 mA to 2 A) enables direct microcontroller GPIO drive without external base resistors in many configurations.
The ZTX605STZ operates with VBE(on) = 1.7 V and VBE(sat) = 1.8 V at IC = 1 A, supporting robust turn-on margin in noisy industrial environments. Safe operating area (SOA) is defined up to 100 µs single-pulse at 10 A/100 V, with DC limit constrained by 1 W Ptot and 5.7 mW/°C thermal derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 120 V - Maximum collector-emitter voltage before breakdown under open-base condition; defines maximum load supply rail compatibility. |
| IC (cont.) | 1 A - Continuous DC collector current rating; sets max steady-state load drive capability without heatsink at 25°C. |
| hFE | ≥2000 @ IC=1 A - Confirmed minimum DC current gain; ensures reliable switching with ≤1 mA base drive at full load. |
| VCE(sat) | ≤1.5 V @ IC=1 A, IB=1 mA - Verified saturation voltage; determines power loss (1.5 W max) and output low-level voltage in switch mode. |
| Ptot | 1 W @ Tamb=25°C - Total package power dissipation limit; requires thermal derating at 5.7 mW/°C above ambient. |
| fT | 150 MHz @ IC=100 mA - Transition frequency; supports switching up to ~10–20 MHz in small-signal amplifier roles. |
| Tj Range | −55°C to +200°C - Junction temperature operating limit; enables deployment in under-hood automotive or high-temp industrial enclosures. |
Pinout & Package
Supplied in E-Line TO-92 compatible package (3-lead plastic case), with standard emitter-base-collector pin assignment when viewed from flat side with leads down.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| E (Emitter) | Current sink terminal | Connected to ground or low-side return path; must handle full load current and support stable biasing via external resistor if needed. |
| B (Base) | Control input node | Drives internal Darlington pair; requires ≥1 mA for guaranteed saturation at 1 A collector load; no external base resistor required in many logic-driven designs. |
| C (Collector) | High-side current source | Connects to positive load supply; withstands up to 120 V transient spikes; layout must minimize inductance for fast switching. |
Key Features
| Feature | Design Value |
|---|---|
| Darlington architecture | Monolithic NPN pair delivering hFE ≥2000 at 1 A-enables direct MCU I/O drive without external amplification. |
| High VCEO | 120 V rating allows use with 24 V, 48 V, and 100 V DC industrial bus systems without additional protection circuitry. |
| Low VCE(sat) | ≤1.5 V at full 1 A load reduces conduction loss to <1.5 W-critical for thermally constrained PCB layouts. |
| Wide Tj range | −55°C to +200°C operation supports deployment in engine control modules, motor drives, and outdoor power equipment. |
| TO-92 mechanical compatibility | E-Line footprint matches legacy ZTX604/ZTX605 variants-enables drop-in replacement on existing production boards. |
Applications
| Industrial Relay Drivers | DC Motor Control Stages |
|---|---|
Use Scenario: Driving 24 V/500 mA electromagnetic relays in PLC I/O modules with 3.3 V or 5 V microcontroller outputs. IC Role / Device Role / Timing Role: High-gain current amplifier acting as interface between low-power logic and inductive load. Use Value: Eliminates need for external driver transistors or optocouplers due to guaranteed hFE ≥2000 at 1 A and VBE(on) = 1.7 V. | Use Scenario: Controlling bidirectional brushed DC motors (up to 1 A stall current) in battery-powered tools and actuators. IC Role / Device Role / Timing Role: Low-side switch in H-bridge half-bridge configuration, handling PWM at ≤20 kHz. Use Value: VCE(sat) ≤1.5 V minimizes heat generation during 100% duty cycle operation, reducing heatsink requirements. |
| Linear Voltage Regulator Pass Elements | Overvoltage Protection Circuits |
Use Scenario: Serving as series pass transistor in adjustable 3–30 V, 1 A linear regulators for test equipment power supplies. IC Role / Device Role / Timing Role: Linear-mode current source regulating output voltage via feedback loop. Use Value: Stable hFE across IC = 100 mA–1 A ensures predictable loop gain and thermal foldback response. | Use Scenario: Clamping transient overvoltages (>100 V) on 24 V sensor inputs in factory automation systems. IC Role / Device Role / Timing Role: Zener-referenced crowbar element triggered by overvoltage detection circuit. Use Value: V(BR)CEO = 120 V provides 20 V safety margin above nominal 100 V surge test levels per IEC 61000-4-5. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX604STZ | VCEO = 100 V (vs. 120 V); hFE ≥2000 at IC = 1 A; identical TO-92 package and pinout. | Limited to ≤80 V DC bus applications; unsuitable for 100 V surge-prone environments. | Select when system max VCE remains below 80 V and cost sensitivity outweighs voltage margin. |
| MJD127G | TO-220 package; VCEO = 100 V; Ptot = 1.5 W; hFE = 1000–4000 @ IC = 1 A. | Requires PCB footprint change and heatsinking; better for >1 A pulsed loads but less compact. | Choose for higher power dissipation needs where TO-92 thermal limits are exceeded. |
Compared with ZTX604STZ, the ZTX605STZ offers 20 V higher VCEO headroom critical for surge immunity; versus MJD127G, it trades package size and thermal capacity for board space savings and simpler assembly-ideal for space-constrained 1 A switching nodes.
Availability
ZTX605STZ is available at Aetrix Electronics and suitable for industrial relay drivers, DC motor control stages, linear voltage regulator pass elements, and overvoltage protection circuits requiring stable component supply across extended temperature ranges.
Supply support for ZTX605STZ 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
Zetex Semiconductors was a UK-based analog and discrete semiconductor specialist acquired by Diodes Incorporated in 2008; known for high-performance bipolar transistors and precision analog ICs.
The ZTX605STZ belongs to the ZTX60x medium-power Darlington family, designed specifically for high-gain, high-voltage switching in industrial control, power management, and ruggedized embedded systems.
FAQ
Is ZTX605STZ RoHS compliant and lead-free?
Yes, ZTX605STZ is RoHS compliant and lead-free per Diodes Incorporated's product change notice PCN-2012-001. The TO-92 package uses matte tin-plated leads and halogen-free molding compound, meeting JEDEC J-STD-020 moisture sensitivity level 1.
What is the recommended base drive for saturation at 1 A collector current?
A base current of 1 mA is specified to ensure VCE(sat) ≤1.5 V at IC = 1 A. This corresponds to forced β = 1000; typical hFE exceeds 2000, so 1 mA provides robust saturation margin even at elevated temperatures.
Can ZTX605STZ be used in linear amplifier configurations?
Yes-its fT = 150 MHz and stable hFE across IC = 100 mA–1 A support Class-A and AB audio preamplifier stages up to ~20 kHz. Thermal design must respect Ptot derating: at 75°C ambient, max dissipation drops to 0.71 W.
Does ZTX605STZ require a base-emitter resistor for stability?
No internal base-emitter resistor is present. An external 10 kΩ–100 kΩ resistor from base to emitter is recommended in high-noise environments to prevent false turn-on from leakage or EMI, especially when driven by open-collector logic or long PCB traces.
ZTX605STZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- E-Line-3, Formed Leads
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Transistor Type:
- NPN - Darlington
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 120 V
- Vce Saturation (Max) @ Ib, Ic:
- 1.5V @ 1mA, 1A
- Current - Collector Cutoff (Max):
- 10µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 2000 @ 1A, 5V
- Power - Max:
- 1 W
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- -55°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- E-Line (TO-92 compatible)
ZTX605STZ FAQ
1.How can I place an order for ZTX605STZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX605STZ 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 ZTX605STZ reliable?
The price and inventory of ZTX605STZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX605STZ is usually 5 days.
3.What payment methods are accepted for ZTX605STZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX605STZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX605STZ?
ZTX605STZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX605STZ 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 ZTX605STZ?
For technical support, including ZTX605STZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX605STZ requirements.
6.How does Aetrix verify that ZTX605STZ is sourced from the original manufacturer or authorized distributors?
All ZTX605STZ 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 ZTX605STZ meets industry standards.
7.What is the process for return or replacement of ZTX605STZ?
All ZTX605STZ units undergo pre-shipment inspection (PSI). If there is an issue with ZTX605STZ, 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 ZTX605STZ part is unused and in its original packaging.
Return procedure for ZTX605STZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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