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Diodes Incorporated ZXTR2005Z-7
- Part No.:
- ZXTR2005Z-7
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-243AA
- Datasheet:
-
ZXTR2005Z-7.pdf
- Description:
- IC REG LINEAR 5V 38MA SOT89
- Quantity:
- Payment:
- Shipping:
Inventory:2,373
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Product details
Overview
ZXTR2005Z-7 from Diodes Incorporated is a monolithic high-voltage linear regulator IC integrating an NPN transistor, Zener diode, and 150kΩ current-limiting resistor in a single SOT89 package. It delivers a regulated 5V ±10% output at up to 30mA from input voltages spanning 10–100V, serving as a compact startup supply for DC-DC converters in PoE-powered networking equipment.
For engineers reviewing the ZXTR2005Z-7 datasheet, ZXTR2005Z-7 pinout, ZXTR2005Z-7 application, or ZXTR2005Z-7 equivalent, key selection criteria include its 100V absolute max input rating, integrated emitter-follower topology, 5V output tolerance, thermal derating behavior on 15mm² vs. 50mm² copper, and SOT89 lead-frame thermal path (RθJL = 20°C/W).
Technical Context
The ZXTR2005Z-7 implements a series linear regulation architecture using an internal emitter-follower stage, where the Zener sets base voltage and the integrated 150kΩ resistor biases the transistor. Regulation is maintained only when VIN ≥10V; below that, VOUT follows VIN –1.5V.
It operates across –40°C to +125°C junction temperature, with safe operating area defined by pulsed (100µs/10ms) and DC current limits dependent on PCB copper area. Thermal performance is explicitly characterized for both 15mm×15mm and 50mm×50mm 1oz copper layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±10% - stable regulation over 10–100V input and –40°C to +125°C TJ |
| Max Input Voltage | 100 V - enables direct connection to PoE 48V/57V or telecom -48V systems without pre-regulation |
| Continuous Output Current | 30 mA - sufficient for biasing gate drivers or control ICs during DC-DC converter startup |
| Quiescent Current | 260–900 µA - set by internal 150kΩ resistor; scales with VIN, enabling low-noise operation at 48V |
| Line Regulation | 195–300 mV - variation over 10–72V input range, critical for stable reference in varying supply conditions |
| Thermal Resistance (Junction-to-Lead) | 20 °C/W - defines heat transfer efficiency to PCB copper via exposed VIN pad in SOT89 |
| PSRR | 45 dB @100Hz - suppresses ripple from upstream unregulated rails feeding PoE or telecom supplies |
Pinout & Package
Package: SOT89 - surface-mount, thermally enhanced plastic package with exposed VIN pad for PCB heat sinking; 3-pin configuration (VIN, GND, VOUT); RoHS-compliant matte tin plating; weight 0.052 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Supply | High-voltage input terminal (–0.3V to 100V); exposed pad must be soldered to ≥15mm² 1oz copper for thermal compliance |
| GND | Power Ground | Reference node for regulation; connects internally to Zener cathode and transistor emitter |
| VOUT | Voltage Output | Regulated 5V output; requires ≥10µA load current and 10µF bypass capacitor to maintain stability |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic integration | Replaces discrete Zener + transistor + resistor solution, reducing BOM count and layout area by >60% |
| Emitter-follower regulation | Provides low-dropout-like behavior (VOUT ≈ VBE + VZ) with inherent short-circuit robustness |
| 150kΩ internal bias resistor | Eliminates external component while setting IQ to ~500µA at 48V, optimizing standby power |
| SOT89 thermal design | Exposed VIN pad delivers RθJL = 20°C/W - enables 1.7W dissipation on 50mm² copper at TA = 25°C |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD (4kV HBM) |
Applications
| Startup Switch in DC-DC Converters | Power-over-Ethernet (PoE) Interface |
|---|---|
Use Scenario: Provides initial bias to PWM controller and gate driver before main DC-DC loop engages. IC Role / Device Role / Timing Role: High-voltage linear regulator supplying 5V/20mA to enable soft-start sequencing. Use Value: Eliminates need for external Zener/resistor network; withstands 100V surge during PoE classification. | Use Scenario: Powers auxiliary circuitry (e.g., PD interface IC, LED indicators) in IEEE 802.3af/at powered devices. IC Role / Device Role / Timing Role: Primary 5V rail generator directly from PoE midspan or PSE output (44–57V). Use Value: Operates across full PoE voltage range without external step-down; RθJL ensures thermal margin at 48V/25mA. |
| Telecom Line Card Power | Industrial Ethernet Switches |
Use Scenario: Supplies isolated control logic on line cards receiving –48V DC from central office battery banks. IC Role / Device Role / Timing Role: Negative-input compatible regulator delivering clean 5V for microcontroller reset and monitoring circuits. Use Value: Supports –48V input (VIN = 0V relative to system ground) with 100V abs-max rating; AEC-Q101 qualification ensures field longevity. | Use Scenario: Powers PHY management circuitry and status LEDs in managed industrial switches deployed in harsh environments. IC Role / Device Role / Timing Role: Robust local 5V source tolerant of 10–100V input transients and wide ambient temperature swings. Use Value: Maintains regulation across –40°C to +85°C ambient; 4kV HBM ESD rating protects against board-handling events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL783CP | Adjustable output (1.25–125V), higher IQ (~1.5mA), TO-220 package, no integrated resistor | Requires external feedback resistors and bias network; better for variable-output designs | Choose TL783CP if adjustable output or >30mA continuous current is required; avoid if space-constrained or fixed 5V needed. |
| ZXTR2005E6TA | Same die in SOT23-6 package; includes enable pin and thermal shutdown; lower IOUT (15mA) | Enables power sequencing and fault protection; suited for multi-rail systems needing controlled startup | Choose ZXTR2005E6TA if enable control or thermal foldback is mandatory; accept 50% lower output current. |
Compared with TL783CP and ZXTR2005E6TA, the ZXTR2005Z-7 offers optimal trade-off between integration (no external components), fixed 5V accuracy, and SOT89 thermal performance - making it ideal for cost-sensitive, space-constrained PoE and telecom startup supplies where simplicity and reliability are prioritized over programmability or protection features.
Availability
ZXTR2005Z-7 is available at Aetrix Electronics and suitable for Power-over-Ethernet (PoE) interfaces, telecom line card power, and industrial Ethernet switch designs requiring stable component supply under high-voltage, wide-temperature operating conditions.
Supply support for ZXTR2005Z-7 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, high-efficiency power management and signal integrity solutions for industrial, computing, and communications markets.
The ZXTR series targets high-voltage linear regulation in space-constrained applications, combining Zener, transistor, and bias elements into monolithic packages to replace legacy discrete solutions in PoE, telecom, and automotive subsystems.
FAQ
What is the minimum input voltage required for regulation?
The ZXTR2005Z-7 requires VIN ≥10V to maintain regulated 5V output. Below 10V, VOUT drops linearly as VIN –1.5V. This threshold is defined by the internal Zener voltage plus transistor VBE drop, and is verified across –40°C to +125°C junction temperature per DS36231 Rev. 4-2.
Can ZXTR2005Z-7 operate from negative input voltages like –48V telecom supplies?
Yes - the device's absolute maximum rating specifies VIN = –0.3V to +100V relative to GND. When used with –48V input, connect the –48V rail to VIN, GND to system ground, and VOUT provides +5V referenced to that ground. This configuration is validated in telecom line card applications per Diodes' application guidance.
Why does the datasheet specify a minimum 10µA load on VOUT?
The internal emitter-follower stage requires base current to sustain regulation. Below ~10µA load, insufficient current flows through the Zener to maintain proper bias, causing VOUT to rise above 5V and lose regulation. A 10µF capacitor and light load ensure stable operation across temperature and input voltage variations.
How does PCB copper area affect maximum continuous output current?
Maximum IOUT is thermally limited: 38mA on 50mm×50mm 1oz copper (RθJA = 59°C/W), but only 15mA on 15mm×15mm copper (RθJA = 112°C/W). Derating curves in DS36231 show IOUT drops linearly as ambient temperature rises - e.g., at 70°C ambient, max IOUT falls to ~22mA on large copper.
ZXTR2005Z-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 100V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 38mA
- Current - Quiescent (Iq):
- 500 µA
- Current - Supply (Max):
- 900 µA
- PSRR:
- 45dB (100Hz)
- Control Features:
- -
- Protection Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
ZXTR2005Z-7 FAQ
1.How can I place an order for ZXTR2005Z-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXTR2005Z-7 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 ZXTR2005Z-7 reliable?
The price and inventory of ZXTR2005Z-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXTR2005Z-7 is usually 5 days.
3.What payment methods are accepted for ZXTR2005Z-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXTR2005Z-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXTR2005Z-7?
ZXTR2005Z-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXTR2005Z-7 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 ZXTR2005Z-7?
For technical support, including ZXTR2005Z-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXTR2005Z-7 requirements.
6.How does Aetrix verify that ZXTR2005Z-7 is sourced from the original manufacturer or authorized distributors?
All ZXTR2005Z-7 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 ZXTR2005Z-7 meets industry standards.
7.What is the process for return or replacement of ZXTR2005Z-7?
All ZXTR2005Z-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZXTR2005Z-7, 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 ZXTR2005Z-7 part is unused and in its original packaging.
Return procedure for ZXTR2005Z-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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