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Taiwan Semiconductor Corporation ZM4747A L0G
- Part No.:
- ZM4747A L0G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF
- Datasheet:
-
ZM4747A L0G.pdf
- Description:
- DIODE ZENER 20V 1W MELF
- Quantity:
- Payment:
- Shipping:
Inventory:2,008
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Product details
Overview
ZM4747A L0G from Taiwan Semiconductor is a 1 W, 20 V ±5% surface-mount Zener diode in MELF glass package, designed for precision voltage regulation and reference applications with 12.5 mA test current, 22 Ω dynamic impedance at IZT, and 15.2 V maximum reverse leakage voltage. It operates across -65°C to +175°C junction temperature range and is used in DC/DC converter feedback loops and low-voltage adapter references.
For engineers reviewing the ZM4747A L0G datasheet, ZM4747A L0G pinout, ZM4747A L0G application, or ZM4747A L0G equivalent, key selection criteria include its 20 V nominal Zener voltage, ±5% tolerance, 1 W power rating, MELF hermetic packaging, and verified thermal resistance of 170°C/W - all critical for stable low-power voltage reference design in space-constrained industrial power supplies.
Technical Context
The ZM4747A L0G functions as a single-die, cathode-banded, unidirectional voltage reference device operating in reverse breakdown mode. Its electrical behavior is defined by tightly controlled Zener voltage (20 V ±5%), low dynamic impedance (22 Ω at 12.5 mA), and guaranteed leakage performance (≤5 µA at 15.2 V).
Designed for surface-mount assembly on PCBs using J-STD-002-compliant soldering, it leverages hermetically sealed MELF glass construction to ensure long-term stability under thermal cycling and humidity exposure - essential for industrial-grade DC/DC converters and adapter circuits requiring repeatable regulation over lifetime.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ @ IZT | 20 V ±5% - defines precise clamping/reference voltage at 12.5 mA test current |
| Power dissipation | 1 W - sets maximum continuous thermal load without derating at 25°C ambient |
| Junction temp max | +175°C - enables operation in high-temp industrial environments without thermal shutdown |
| Zener impedance ZZT | 22 Ω @ 12.5 mA - ensures minimal output voltage variation under load transients |
| Leakage current IR | ≤5 µA @ 15.2 V - guarantees low standby power loss in battery-backed or energy-sensitive designs |
| Package | MELF (DO-213AB) - provides hermetic sealing and superior thermal dissipation vs. SOD-123 |
Pinout & Package
Package: MELF (DO-213AB) glass body with matte tin-plated leads; cathode indicated by black band; weight ≈129.9 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to circuit common when used as shunt regulator; establishes reference potential |
| Cathode | Reverse breakdown terminal / regulated output node | Connected to input voltage source; delivers stable 20 V output when reverse biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable regulation without post-production trimming in cost-sensitive power rails |
| Hermetically sealed glass MELF | Prevents moisture ingress and parameter drift over 10+ years in humid industrial enclosures |
| 170°C/W junction-to-ambient RθJA | Allows 1 W operation with ≤170°C junction rise above board-level ambient - no heatsink required |
| RoHS-compliant construction | Meets global environmental compliance requirements for industrial and consumer electronics manufacturing |
Applications
| DC/DC Converter Feedback | Low-Voltage Adapter Reference |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or buck-derived DC/DC modules. IC Role / Device Role / Timing Role: Shunt voltage reference providing feedback signal to PWM controller error amplifier. Use Value: 20 V Zener voltage and 22 Ω impedance maintain <1% output deviation across line/load variations. | Use Scenario: Stabilizing secondary-side output in wall-mounted AC/DC adapters. IC Role / Device Role / Timing Role: Precision voltage clamp defining regulated 20 V rail for downstream logic or sensing circuitry. Use Value: ±5% tolerance and low leakage (<5 µA) ensure consistent adapter performance across production batches. |
| On-Board Voltage Monitor | Industrial Sensor Bias Supply |
Use Scenario: Providing threshold detection for undervoltage lockout (UVLO) in embedded controllers. IC Role / Device Role / Timing Role: Zener-based comparator reference enabling accurate 20 V trip point activation. Use Value: Stable 20 V reference with 175°C max junction temperature supports reliable UVLO in hot industrial cabinets. | Use Scenario: Generating stable bias voltage for analog sensor front-ends in factory automation systems. IC Role / Device Role / Timing Role: Low-drift shunt regulator supplying clean 20 V to op-amp or ADC reference inputs. Use Value: Hermetic MELF packaging prevents parameter shift due to condensation or chemical exposure near machinery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4747A | Same 20 V ±5%, but DO-41 through-hole package; higher RθJA (~500°C/W) | Requires PCB through-holes and manual assembly; unsuitable for automated SMT lines | Select only if legacy through-hole design or prototyping without reflow capability |
| BZX55C20 | 20 V ±5%, DO-35 glass package; 500 mW rating; 25 Ω Zener impedance | Lower power handling limits use to sub-500 mW reference paths; less thermally robust | Choose when board space allows larger DO-35 footprint and thermal load is <0.5 W |
Compared with 1N4747A and BZX55C20, the ZM4747A L0G offers superior thermal performance (170°C/W), SMT compatibility, and full 1 W capability - making it optimal for high-density, high-reliability industrial DC/DC converters where board area and thermal management are constrained.
Availability
ZM4747A L0G is available at Aetrix Electronics and suitable for DC/DC converter feedback, low-voltage adapter reference, and on-board voltage monitor applications requiring stable component supply, RoHS compliance, and MELF package reliability.
Supply support for ZM4747A L0G 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, analog ICs, and protection components for industrial, automotive, and consumer markets.
The ZM47xxA series was developed specifically for high-stability, surface-mount Zener voltage reference applications demanding hermetic reliability, tight tolerance, and extended temperature operation - targeting industrial power conversion and adapter design.
FAQ
What is the Zener voltage tolerance of the ZM4747A L0G?
The ZM4747A L0G has a nominal Zener voltage of 20 V with a standard tolerance of ±5%, meaning the actual measured VZ falls between 19.0 V and 21.0 V at 12.5 mA test current under 25°C conditions. This tolerance is confirmed in the official Taiwan Semiconductor datasheet Version E2301 and applies to all units shipped under the ZM4747A L0G ordering code.
Is the ZM4747A L0G compatible with lead-free reflow soldering processes?
Yes, the ZM4747A L0G features matte tin-plated leads compliant with J-STD-002 solderability standards and is rated for lead-free reflow profiles up to 260°C peak temperature. Its MELF glass package withstands thermal shock during standard IPC/JEDEC J-STD-020-compliant reflow cycles without cracking or parameter shift.
What is the maximum power dissipation of the ZM4747A L0G at 70°C ambient?
At 70°C ambient, the ZM4747A L0G must be derated linearly from its 1 W rating at 25°C using its 170°C/W thermal resistance. The allowable power drops to approximately 0.74 W (1 W × [1 − (70−25)/170]), ensuring junction temperature remains below 175°C. Full 1 W operation requires ambient ≤25°C or additional board-level thermal management.
Does the ZM4747A L0G have polarity marking, and how is it identified?
Yes, the ZM4747A L0G uses a cathode band - a distinct black circumferential stripe near one end of the MELF glass body - to indicate the cathode terminal. This marking aligns with JEDEC DO-213AB mechanical standards and must be oriented toward the higher-potential node in shunt regulator configurations to ensure proper reverse-bias operation.
How does the ZM4747A L0G compare to the ZM4747A L0 in terms of electrical performance?
The ZM4747A L0G and ZM4747A L0 are electrically and mechanically identical per Taiwan Semiconductor's ordering information note: "L0/L0G refer to physically identical parts without any differences." Both share identical Zener voltage, impedance, leakage, thermal, and packaging specifications - differing only in tape-and-reel packaging labeling for logistics tracking.
ZM4747A L0G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-213AB, MELF
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 22 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 15.2 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- MELF
ZM4747A L0G FAQ
1.How can I place an order for ZM4747A L0G through Aetrix?
Please submit a Request for Quotation (RFQ) for ZM4747A L0G 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 ZM4747A L0G reliable?
The price and inventory of ZM4747A L0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZM4747A L0G is usually 5 days.
3.What payment methods are accepted for ZM4747A L0G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZM4747A L0G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZM4747A L0G?
ZM4747A L0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZM4747A L0G 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 ZM4747A L0G?
For technical support, including ZM4747A L0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZM4747A L0G requirements.
6.How does Aetrix verify that ZM4747A L0G is sourced from the original manufacturer or authorized distributors?
All ZM4747A L0G 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 ZM4747A L0G meets industry standards.
7.What is the process for return or replacement of ZM4747A L0G?
All ZM4747A L0G units undergo pre-shipment inspection (PSI). If there is an issue with ZM4747A L0G, 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 ZM4747A L0G part is unused and in its original packaging.
Return procedure for ZM4747A L0G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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