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Diodes Incorporated ZM4730A-13
- Part No.:
- ZM4730A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
ZM4730A-13.pdf
- Description:
- DIODE ZENER 3.9V 1W MELF
- Quantity:
- Payment:
- Shipping:
Inventory:5,502
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Product details
Overview
ZM4730A-13 from Diodes Incorporated is a 1.0W surface-mount Zener diode with nominal zener voltage 3.9V ±5%, 64mA test current (IZT), 9.0Ω zener impedance at IZT, 50µA maximum reverse leakage at 1.0V, and MELF glass package for precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the ZM4730A-13 datasheet, ZM4730A-13 pinout, ZM4730A-13 application, or ZM4730A-13 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (170°C/W), surge current rating (1190mA @ 8.3ms), forward voltage (1.2V @ 200mA), and MELF mechanical dimensions (A: 4.8–5.2mm, B: 2.4–2.6mm).
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable voltage across load variations, with sharp knee characteristics verified by dual-point zener impedance measurement per DS18009 Rev. 4. Its 3.9V nominal regulation targets low-voltage logic supply clamping and ADC reference stabilization.
Designed for ambient temperatures from –65°C to +200°C, it uses glass-passivated MELF construction with solderable terminals compliant with MIL-STD-202 Method 208. Power derating begins linearly above 50°C per Figure 1, reaching zero dissipation at 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9V ±5% @ IZT = 64mA - defines precise clamping threshold for 3.3V/5V rail protection |
| Power Dissipation (Pd) | 1.0W @ TA = 25°C - sets maximum continuous DC power handling before thermal shutdown |
| Zener Impedance (ZZT) | 9.0Ω @ IZT - ensures minimal output voltage variation under dynamic load transients |
| Reverse Leakage (IR) | 50µA @ VR = 1.0V - guarantees low standby current in battery-powered voltage monitor circuits |
| Surge Current (IZS) | 1190mA @ 8.3ms - withstands IEC 61000-4-5 Level 3 line surges without degradation |
| Thermal Resistance (RJA) | 170°C/W - determines junction temperature rise under PCB convection cooling only |
| Forward Voltage (VF) | 1.2V @ IF = 200mA - enables use as low-drop rectifier in dual-function bias networks |
Pinout & Package
MELF (Metal Electrode Leadless Face) glass package with axial cathode band marking; no discrete pins - two solderable end terminals conforming to MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node during forward bias; used for polarity-sensitive ESD clamp paths |
| Cathode | Zener breakdown terminal | Marked by visible band; connected to regulated voltage node; sinks current during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Sharp knee breakdown characteristic | Verified via dual-point Zener impedance measurement to eliminate unstable units |
| High-temperature operation | Junction/storage range –65°C to +200°C supports under-hood automotive and downhole industrial use |
| Stable 5% VZ tolerance | Guaranteed at 25°C with defined IZT, enabling predictable reference design without post-calibration |
| Low-profile MELF form factor | Height ≤2.6mm allows placement in space-constrained PCB layouts near IC power pins |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Zener diode providing 3.9V reference to op-amp bias network and ADC input clamp. Use Value: 9.0Ω ZZT minimizes sensor output drift under varying load currents; 50µA IR prevents signal offset in µA-level bridge outputs. | Use Scenario: Clamping D+ and D− lines against ESD and hot-swap transients in USB 2.0 host controllers. IC Role / Device Role / Timing Role: Discrete Zener acting as bidirectional transient voltage suppressor on differential data lines. Use Value: 1190mA 8.3ms surge rating absorbs IEC 61000-4-2 contact discharge without latch-up; MELF glass passivation ensures long-term reliability. |
| Low-Power IoT Node Voltage Reference | Automotive Cabin Control Panel Supply Clamp |
Use Scenario: Generating stable 3.9V bias for ultra-low-power microcontroller reset circuitry in battery-operated smart meters. IC Role / Device Role / Timing Role: Zener diode regulating voltage for RC reset timer and brown-out detector input. Use Value: 1.2V VF enables use as forward-biased clamp during cold-start; –65°C to +200°C rating covers extended storage and field deployment. | Use Scenario: Protecting 3.3V MCU I/O pins from load-dump spikes in HVAC control panels exposed to 12V vehicle battery fluctuations. IC Role / Device Role / Timing Role: Zener placed between I/O line and ground to shunt transient energy during ignition switching. Use Value: 1.0W Pd rating sustains 100ms load-dump pulses; 170°C/W RJA allows direct mounting on FR-4 without heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAZ3V9-TP (Micro Commercial) | Same 3.9V/5%/1W rating but SOD-123 package; RJA = 200°C/W; VF = 1.1V | Surface-mount footprint differs; less thermal margin in high-ambient environments | Select when board space is constrained and thermal load is below 0.6W |
| DFLZ3V9Q-7 (Diodes Inc.) | Same 3.9V/5%/1W; DFN1006 package; RJA = 300°C/W; AEC-Q200 qualified | Automotive-grade qualification; higher thermal resistance limits power handling | Select for automotive production requiring PPAP documentation and stress testing |
Compared with SMAZ3V9-TP and DFLZ3V9Q-7, ZM4730A-13 offers superior thermal performance (170°C/W vs. ≥200°C/W) and proven MELF reliability in high-reliability industrial settings, though requiring larger PCB area than SMD alternatives.
Availability
ZM4730A-13 is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port protection, low-power IoT voltage reference, and automotive cabin control panel supply clamp applications requiring stable component supply and long-lifecycle support.
Supply support for ZM4730A-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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the U.S.
The ZM47xxA series belongs to Diodes' precision Zener diode product line, engineered for stable voltage regulation in industrial, computing, and communications equipment where tight tolerance and high-temperature reliability are critical.
FAQ
Is ZM4730A-13 still in active production?
No - Diodes Incorporated has discontinued the ZM4730A-13 and recommends migrating to the SMAZ or DFLZ series. Aetrix Electronics maintains legacy inventory for existing designs and provides cross-reference support for drop-in replacements with validated electrical and thermal equivalence.
What is the cathode identification method on ZM4730A-13?
The cathode is marked by a distinct dark band encircling one end of the MELF glass body. This band aligns with the cathode terminal in schematic symbols and must connect toward the higher-potential node during Zener operation for proper voltage regulation.
Can ZM4730A-13 be used in place of a 3.3V Zener diode?
No - ZM4730A-13 is specified at 3.9V ±5%, not 3.3V. Substituting it for a 3.3V device would raise the clamping or reference voltage by 18%, potentially causing logic level mismatch or ADC saturation. Use ZM4728A (3.3V) instead.
Does ZM4730A-13 require a heatsink in 1W operation?
No external heatsink is required at 25°C ambient, but power must be derated linearly above 50°C per Figure 1. At 75°C ambient, maximum dissipation drops to 0.5W. PCB copper area (≥1 cm² per terminal) serves as sufficient thermal path for most applications.
ZM4730A-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):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 9 Ohms
- Current - Reverse Leakage @ Vr:
- 50 µA @ 1 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
ZM4730A-13 FAQ
1.How can I place an order for ZM4730A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZM4730A-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 ZM4730A-13 reliable?
The price and inventory of ZM4730A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZM4730A-13 is usually 5 days.
3.What payment methods are accepted for ZM4730A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZM4730A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZM4730A-13?
ZM4730A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZM4730A-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 ZM4730A-13?
For technical support, including ZM4730A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZM4730A-13 requirements.
6.How does Aetrix verify that ZM4730A-13 is sourced from the original manufacturer or authorized distributors?
All ZM4730A-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 ZM4730A-13 meets industry standards.
7.What is the process for return or replacement of ZM4730A-13?
All ZM4730A-13 units undergo pre-shipment inspection (PSI). If there is an issue with ZM4730A-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 ZM4730A-13 part is unused and in its original packaging.
Return procedure for ZM4730A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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