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Diodes Incorporated ZM4747A-13
- Part No.:
- ZM4747A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
ZM4747A-13.pdf
- Description:
- DIODE ZENER 20V 1W MELF
- Quantity:
- Payment:
- Shipping:
Inventory:2,586
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Product details
Overview
ZM4747A-13 from Diodes Incorporated is a 1.0W surface-mount Zener diode with nominal Zener voltage 20V ±5% at 12.5mA test current, 22Ω maximum Zener impedance at IZT, and 15.2mA maximum Zener current; used for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the ZM4747A-13 datasheet, ZM4747A-13 pinout, ZM4747A-13 application, or ZM4747A-13 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (170°C/W), surge current rating (225A @ 8.3ms), reverse leakage (5.0µA @ 15.2V), and MELF glass package compatibility with automated reflow assembly.
Technical Context
This device operates as a two-terminal voltage reference diode with sharp breakdown knee verified by dual-point Zener impedance measurement under 60Hz AC superposition. Its 20V nominal Zener voltage is stabilized at 12.5mA DC test current (IZT) with 5% tolerance at 25°C ambient.
Thermal performance is defined by 170°C/W junction-to-ambient thermal resistance and derating to zero power at +150°C ambient per Fig. 1. The MELF glass package enables high reliability in automotive and industrial environments with operating temperature range from –65°C to +200°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V ±5% @ IZT = 12.5 mA - defines regulated output voltage in shunt regulator designs |
| Power Dissipation (Pd) | 1.0 W @ TA = 25°C - sets maximum continuous DC power handling before thermal derating |
| Zener Impedance (ZZT) | 22 Ω max @ IZT - determines regulation accuracy under dynamic load changes |
| Reverse Leakage (IR) | 5.0 µA max @ VR = 15.2 V - ensures low standby current in high-impedance bias networks |
| Surge Current (IZS) | 225 A @ 8.3 ms - supports transient overvoltage clamping without failure |
| Thermal Resistance (RJA) | 170 °C/W - dictates PCB copper area and airflow requirements for thermal management |
| Operating Temperature | –65°C to +200°C - enables use in under-hood automotive and downhole industrial applications |
Pinout & Package
Two-terminal MELF (Metal Electrode Leadless Face) glass package with cathode band marking; terminals are solderable per MIL-STD-202, Method 208. Dimensions: A = 4.8–5.2 mm length, B = 2.4–2.6 mm diameter, C = 0.55 mm nominal cathode band width.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit ground or lower-potential rail in shunt regulation topology |
| Cathode | Zener breakdown terminal / Regulated voltage node | Connected to input supply and load; maintains stable 20V relative to anode during conduction |
Key Features
| Feature | Design Value |
|---|---|
| Sharp breakdown knee verification | Dual-point Zener impedance measurement eliminates unstable units and ensures predictable regulation onset |
| MIL-STD-202 compliant terminations | Guarantees solder joint integrity under thermal cycling and mechanical stress in harsh environments |
| High surge current capability | 225A peak for 8.3ms enables robust transient suppression without external series limiting |
| Wide operating temperature range | –65°C to +200°C supports deployment in engine control units and industrial motor drives |
Applications
| Switch-Mode Power Supply Feedback | Automotive ECU Voltage Clamp |
|---|---|
Use Scenario: Regulates error amplifier reference in isolated flyback converter feedback network. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 20V threshold for optocoupler-driven primary-side control. Use Value: 5% VZ tolerance and 22Ω ZZT ensure <±1.5% output voltage stability across line/load/temperature variations. | Use Scenario: Clamps 24V battery rail transients in engine control unit power domain. IC Role / Device Role / Timing Role: Two-terminal overvoltage protector absorbing load-dump energy spikes up to 225A. Use Value: 8.3ms surge rating and –65°C to +200°C operation meet ISO 7637-2 Pulse 5a requirements. |
| Industrial Sensor Signal Conditioning | Programmable Logic Controller Input Protection |
Use Scenario: Stabilizes excitation voltage for 4–20mA current-loop pressure sensors. IC Role / Device Role / Timing Role: Precision shunt regulator maintaining constant 20V bias across sensor bridge. Use Value: Low 5.0µA IR at 15.2V minimizes error in high-impedance sensor bias paths. | Use Scenario: Protects 24V digital input channels from field-wiring induced surges. IC Role / Device Role / Timing Role: Fast-response voltage clamp placed directly at connector interface. Use Value: MELF glass construction withstands repeated surge events without parameter drift or cracking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAZ20-13 | Same 20V VZ, but SOD-123 package; 1.0W Pd, 25Ω ZZT, 5µA IR @ 15.2V | Surface-mount footprint differs; better suited for space-constrained PCBs with standard pick-and-place | Select when board real estate is limited and MELF handling is not supported in assembly line |
| DFLZ20-7 | Same 20V VZ, DFN1006 package; 0.5W Pd, 30Ω ZZT, 10µA IR @ 15.2V | Lower power rating and higher leakage; intended for low-current biasing, not power regulation | Select only for signal-level clamping where <500mW dissipation is guaranteed |
Compared with ZM4747A-13, SMAZ20-13 offers identical electrical specs in a more manufacturable package, while DFLZ20-7 trades power handling and leakage performance for ultra-small size-making ZM4747A-13 optimal for high-reliability 1W regulation where thermal margin and long-term stability are critical.
Availability
ZM4747A-13 is available at Aetrix Electronics and suitable for switch-mode power supplies, automotive electronic control units, industrial sensor interfaces, and programmable logic controller input protection requiring stable component supply across extended temperature ranges.
Supply support for ZM4747A-13 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 automotive, industrial, and computing markets.
The ZM47xxA series belongs to Diodes' high-power MELF Zener portfolio, engineered for stable voltage reference and transient suppression in demanding environments where glass-package robustness and wide temperature operation are essential.
FAQ
What is the maximum steady-state power dissipation for ZM4747A-13 at 70°C ambient?
At 70°C ambient, ZM4747A-13 derates linearly from 1.0W at 25°C using its 170°C/W RJA. The allowable power is calculated as (150°C − 70°C) × (1W / 125°C) = 0.64W. This value aligns with the derating curve in DS18009 Rev. 4, Figure 1.
Is ZM4747A-13 suitable for bidirectional transient protection?
No. ZM4747A-13 is a unidirectional Zener diode with cathode-band polarity. It conducts only in reverse breakdown (cathode positive) and forward-biases like a standard diode below ~1.2V. Bidirectional protection requires a TVS array or back-to-back Zener configuration.
How does the 5% Zener voltage tolerance affect feedback loop accuracy in a 20V SMPS?
With 5% tolerance (±1.0V), the actual regulation point varies between 19.0V and 21.0V. In a typical TL431-based feedback loop, this introduces up to ±2.5% output voltage error before compensation, requiring careful gain staging and possibly trimming resistors for tighter final tolerance.
Why was the ZM47xxA series discontinued, and what does "Use SMAZ OR DFLZ Series" mean?
Diodes Incorporated discontinued ZM47xxA due to MELF manufacturing constraints and shift toward standardized SMT packages. SMAZ (SOD-123) and DFLZ (DFN1006) series offer equivalent Zener voltages with improved assembly yield and RoHS-compliant termination finishes, though with trade-offs in power rating and thermal resistance.
ZM4747A-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-213AB, MELF (Glass)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- MELF
ZM4747A-13 FAQ
1.How can I place an order for ZM4747A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZM4747A-13 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-13 reliable?
The price and inventory of ZM4747A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZM4747A-13 is usually 5 days.
3.What payment methods are accepted for ZM4747A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZM4747A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZM4747A-13?
ZM4747A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZM4747A-13 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-13?
For technical support, including ZM4747A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZM4747A-13 requirements.
6.How does Aetrix verify that ZM4747A-13 is sourced from the original manufacturer or authorized distributors?
All ZM4747A-13 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-13 meets industry standards.
7.What is the process for return or replacement of ZM4747A-13?
All ZM4747A-13 units undergo pre-shipment inspection (PSI). If there is an issue with ZM4747A-13, 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-13 part is unused and in its original packaging.
Return procedure for ZM4747A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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