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Taiwan Semiconductor Corporation ZM4734A
- Part No.:
- ZM4734A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF
- Datasheet:
-
ZM4734A.pdf
- Description:
- DIODE ZENER 5.6V 1W MELF
- Quantity:
- Payment:
- Shipping:
Inventory:4,506
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Product details
Overview
ZM4734A from Taiwan Semiconductor is a 1W surface-mount Zener diode with a nominal zener voltage of 5.6V ±5%, 45mA test current (IZT), 600Ω dynamic impedance (ZZT), and MELF glass package. It serves as a precision voltage reference or low-voltage stabilizer in DC/DC converters and power adapters.
For engineers reviewing the ZM4734A datasheet, ZM4734A pinout, ZM4734A application, or ZM4734A equivalent, key selection criteria include its 5.6V regulation tolerance, 1W power dissipation, 175°C max junction temperature, MELF mechanical robustness, and cathode-band polarity marking for reliable board-level integration.
Technical Context
The ZM4734A operates as a single-die, hermetically sealed glass Zener diode optimized for stable voltage regulation under DC bias. Its 5.6V nominal breakdown voltage is specified at 45mA IZT, with 600Ω dynamic impedance ensuring predictable regulation slope near the knee.
Designed for surface-mount assembly on standard PCBs, it features matte tin-plated leads compliant with J-STD-002 solderability and a cathode band for unambiguous polarity identification-critical for reverse-biased operation in reference and clamp circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ @ IZT | 5.6V ±5% - precise DC reference voltage at 45mA operating point |
| Power dissipation | 1W - supports continuous regulation in compact power rails without forced cooling |
| Junction temp max | 175°C - enables use in high-ambient industrial and automotive under-hood environments |
| Zener impedance ZZT | 600Ω @ 45mA - defines regulation sensitivity to load current changes |
| Leakage current IR | 10µA @ 2.0V VR - ensures minimal error contribution when used as a low-current reference |
| Package | MELF (DO-213AB) - cylindrical glass body with axial leads for high reliability and thermal cycling endurance |
Pinout & Package
Package: MELF (DO-213AB) glass body, 5.20mm length × 1.50mm diameter, cathode indicated by black band. Matte tin-plated axial leads, solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration |
| Cathode | Zener breakdown terminal | Marked with black band; connected to higher-potential node to enable regulated voltage drop |
Key Features
| Feature | Design Value |
|---|---|
| Hermetically sealed glass construction | Prevents moisture ingress and long-term parameter drift in humid or harsh environments |
| ±5% VZ tolerance | Enables consistent voltage reference performance across production batches without trimming |
| RoHS-compliant materials | Meets global environmental compliance requirements for commercial and industrial PCB assembly |
| 129.9mg unit weight | Supports automated pick-and-place handling with minimal nozzle vacuum demand |
Applications
| Low-Voltage Stabilizers | On-Board DC/DC Converters |
|---|---|
Use Scenario: Providing stable 5.6V bias for op-amp input stages or microcontroller reset circuits in space-constrained consumer electronics. IC Role / Device Role / Timing Role: Voltage reference element maintaining fixed potential against supply ripple and load variation. Use Value: Delivers 5.6V ±5% regulation with <600Ω impedance, minimizing output deviation under 10–50mA load swings. | Use Scenario: Acting as feedback reference in isolated flyback or buck-derived auxiliary supplies powering gate drivers or sensors. IC Role / Device Role / Timing Role: Precision shunt regulator setting output voltage via optocoupler feedback loop. Use Value: Enables accurate 5.6V setpoint with 10µA leakage at 2V, reducing feedback error in closed-loop regulation. |
| Power Adapters | Industrial Sensor Signal Conditioning |
Use Scenario: Secondary-side voltage clamp and reference in universal-input AC/DC wall adapters delivering 5V USB output. IC Role / Device Role / Timing Role: Overvoltage protection and regulation reference in linear post-regulator or TL431-assisted topology. Use Value: Withstands 175°C junction temperature and maintains 5.6V stability across 0–70°C ambient, improving adapter lifetime. | Use Scenario: Biasing and level-shifting transducer outputs (e.g., RTD bridges, strain gauges) in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Low-drift DC reference source for ADC reference buffers and instrumentation amplifier gain-setting networks. Use Value: Hermetic MELF package ensures long-term VZ stability (<1% drift over 10k hours), critical for metrology-grade accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4734A | Same 5.6V ±5%, 1W rating, but DO-41 through-hole package (not MELF) | Requires through-hole PCB layout and wave-solder process; unsuitable for high-density SMT designs | Select ZM4734A for automated SMT assembly; choose 1N4734A only if legacy through-hole compatibility is mandatory |
| BZX55-C5V6 | 5.6V ±5%, 500mW rating, DO-35 glass package, higher ZZT (~1000Ω) | Limited to lower-power references; less stable regulation under varying load due to higher impedance | ZM4734A preferred where 1W dissipation or tighter regulation (600Ω vs. 1000Ω) is required |
Compared with 1N4734A and BZX55-C5V6, the ZM4734A offers MELF SMT compatibility, full 1W power handling, and superior 600Ω impedance-making it optimal for high-reliability, high-density DC/DC reference and stabilization roles where thermal robustness and regulation precision are prioritized.
Availability
ZM4734A is available at Aetrix Electronics and suitable for low-voltage stabilizers, on-board DC/DC converters, and power adapters requiring stable component supply, RoHS compliance, and MELF-package reliability.
Supply support for ZM4734A 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving industrial, computing, and consumer markets since 1979.
The ZM47xxA series was designed specifically for high-stability, surface-mount Zener reference applications-emphasizing hermetic sealing, tight voltage tolerance, and MELF ruggedness for mission-critical power and sensing functions.
FAQ
What is the nominal zener voltage and tolerance of the ZM4734A?
The ZM4734A has a nominal zener voltage of 5.6V with a standard tolerance of ±5%, measured at a test current (IZT) of 45mA. This specification is confirmed in the Electrical Specifications table of the official Taiwan Semiconductor datasheet (Version E2301), and applies across the full operating temperature range of −65°C to +175°C.
What package type does the ZM4734A use, and what are its key mechanical features?
The ZM4734A uses a MELF (Metal Electrode Leadless Face) glass package per JEDEC DO-213AB, measuring 5.20mm in length and 1.50mm in diameter. It features a cathode band for polarity identification, matte tin-plated axial leads compliant with J-STD-002, and weighs approximately 129.9mg-optimized for high-reliability SMT placement and thermal cycling endurance.
What is the maximum power dissipation and junction temperature rating for the ZM4734A?
The ZM4734A is rated for 1W maximum power dissipation at TA = 25°C and supports a junction temperature range of −65°C to +175°C. Its junction-to-ambient thermal resistance (RθJA) is 170°C/W, meaning it can sustain full 1W operation in ambient temperatures up to ~70°C with adequate PCB copper area, per the Absolute Maximum Ratings table.
How does the ZM4734A's zener impedance compare to similar 5.6V diodes, and why does it matter?
The ZM4734A exhibits a zener impedance (ZZT) of 600Ω at 45mA, significantly lower than alternatives like BZX55-C5V6 (≈1000Ω). Lower impedance means smaller output voltage variation under changing load current-critical for precision references in feedback loops or sensor biasing where regulation stability directly impacts system accuracy.
Is the ZM4734A RoHS compliant, and what does that mean for manufacturing?
Yes, the ZM4734A is RoHS compliant, confirming it contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE) above threshold limits. This allows unrestricted use in EU and global commercial/industrial electronics, supports lead-free reflow profiles, and eliminates hazardous substance reporting obligations in supply chain documentation.
ZM4734A 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):
- 5.6 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 2 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- MELF
ZM4734A FAQ
1.How can I place an order for ZM4734A through Aetrix?
Please submit a Request for Quotation (RFQ) for ZM4734A 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 ZM4734A reliable?
The price and inventory of ZM4734A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZM4734A is usually 5 days.
3.What payment methods are accepted for ZM4734A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZM4734A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZM4734A?
ZM4734A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZM4734A 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 ZM4734A?
For technical support, including ZM4734A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZM4734A requirements.
6.How does Aetrix verify that ZM4734A is sourced from the original manufacturer or authorized distributors?
All ZM4734A 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 ZM4734A meets industry standards.
7.What is the process for return or replacement of ZM4734A?
All ZM4734A units undergo pre-shipment inspection (PSI). If there is an issue with ZM4734A, 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 ZM4734A part is unused and in its original packaging.
Return procedure for ZM4734A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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