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Taiwan Semiconductor Corporation MMSZ4712 RHG
- Part No.:
- MMSZ4712 RHG
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ4712 RHG.pdf
- Description:
- DIODE ZENER 28V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:2,900
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Product details
Overview
MMSZ4712 RHG from Taiwan Semiconductor is a 28 V nominal, 500 mW surface-mount Zener diode in SOD-123 package, designed for precision voltage regulation and overvoltage protection in space-constrained DC power rails. It delivers 26.6–29.4 V zener voltage at 50 mA test current, with ≤0.01 µA leakage at 21.2 V reverse bias, and operates across –55°C to +150°C junction temperature.
For engineers reviewing the MMSZ4712 RHG datasheet, MMSZ4712 RHG pinout, MMSZ4712 RHG application, or MMSZ4712 RHG equivalent, key selection criteria include its 28 V nominal zener voltage, 500 mW power rating, SOD-123 footprint compatibility, low leakage performance, and RoHS/halogen-free compliance for industrial and consumer power management designs.
Technical Context
The MMSZ4712 RHG functions as a two-terminal voltage reference device operating in reverse breakdown mode. Its zener voltage is specified at 50 mA test current (IZT), with dynamic impedance and temperature coefficient determined by its silicon process and doping profile.
It exhibits ≤0.01 µA reverse leakage current at VR = 21.2 V, confirming stable regulation under light-load or standby conditions. Thermal resistance is 340°C/W (junction-to-ambient, on 5 cm × 5 cm Cu pad), limiting continuous power dissipation at elevated ambient temperatures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 26.6–29.4 V at 50 mA - defines regulated output voltage tolerance band for feedback or clamp circuits |
| Power Dissipation (PD) | 500 mW - maximum steady-state power handling on standard PCB copper area |
| Junction Temperature (TJ) | –55°C to +150°C - supports operation in automotive under-hood and industrial control environments |
| Leakage Current (IR) | ≤0.01 µA at 21.2 V - ensures minimal quiescent current draw in battery-backed or low-power systems |
| Package | SOD-123 - 2.85 mm × 1.80 mm surface-mount outline compatible with automated pick-and-place |
| Thermal Resistance (RθJA) | 340°C/W - determines required board copper area for thermal management at full load |
Pinout & Package
Two-terminal device in SOD-123 package: cathode indicated by band; anode and cathode are unmarked terminals on opposite ends of the molded body. No internal circuitry-pinout is polarity-defined only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-bias input terminal | Connected to higher-potential node in regulation/clipper configuration; determines breakdown direction |
| Anode (unbanded end) | Reference/return terminal | Typically tied to ground or lower-voltage rail; completes reverse-bias path for zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Constant voltage regulation | Stable 28 V reference with ±5% tolerance at 50 mA enables accurate feedback in LDOs or SMPS |
| Moisture sensitivity level 1 | No dry-pack or bake requirement before reflow-compatible with standard SMT assembly lines |
| RoHS and halogen-free compliance | Meets global environmental directives without compromising thermal or electrical performance |
| UL 94V-0 molding compound | Self-extinguishing encapsulation suitable for safety-critical power supply designs |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or non-isolated buck-derived DC-DC converters. IC Role / Device Role / Timing Role: Zener diode provides reference voltage to optocoupler or error amplifier input. Use Value: Tight 26.6–29.4 V tolerance ensures ±1% output regulation accuracy when paired with standard TL431-based feedback networks. | Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events on 24 V industrial bus lines. IC Role / Device Role / Timing Role: Shunt clamping element diverting excess energy to ground during ESD or surge events. Use Value: Low 0.01 µA leakage preserves signal integrity during normal operation while enabling fast response to >21.2 V transients. |
| Voltage Reference | Battery Monitoring |
Use Scenario: Providing stable reference for analog-to-digital conversion of sensor signals in condition-monitoring equipment. IC Role / Device Role / Timing Role: Passive voltage reference source for ADC reference divider or comparator threshold setting. Use Value: 28 V nominal value allows direct scaling to 3.3 V or 5 V logic domains using resistor dividers with predictable tolerance stack-up. | Use Scenario: Detecting end-of-charge or overvoltage conditions in 24 V lead-acid or LiFePO₄ battery packs. IC Role / Device Role / Timing Role: Threshold detector in discrete comparator circuits monitoring cell string voltage. Use Value: Precise 26.6–29.4 V window aligns with common 24 V battery overvoltage thresholds (28.8 V typical), minimizing false triggers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C27LT1G | 27 V nominal, SOT-23 package, 350 mW rating, 100 nA leakage at 22.8 V | Smaller footprint but lower power and higher leakage; less suitable for sustained clamp duty | Select for space-constrained, low-current reference use where thermal margin is not critical |
| MMBZ5255BS-7-F | 28 V nominal, SOT-323 package, 200 mW rating, 100 nA leakage at 22.8 V | Higher leakage and lower power limit restrict use to signal-level protection only | Prefer for ultra-dense layouts requiring sub-2 mm² area; avoid in power rail clamping |
Compared with BZX84-C27LT1G and MMBZ5255BS-7-F, the MMSZ4712 RHG offers superior thermal capability (500 mW vs ≤350 mW), lower leakage (0.01 µA vs ≥0.1 µA), and SOD-123 mechanical robustness-making it optimal for industrial power regulation where reliability under sustained stress matters.
Availability
MMSZ4712 RHG is available at Aetrix Electronics and suitable for industrial power supplies, battery management systems, and embedded sensor interfaces requiring stable component supply with consistent parametric performance across production lots.
Supply support for MMSZ4712 RHG 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 MMSZ4712 RHG belongs to TSC's MMSZ4678–MMSZ4716 family of 500 mW Zener diodes, engineered for high-density, cost-sensitive voltage regulation and transient suppression in compact power electronics.
FAQ
What is the nominal zener voltage of the MMSZ4712 RHG?
The MMSZ4712 RHG has a nominal zener voltage of 28 V, with a guaranteed range of 26.6 V to 29.4 V at 50 mA test current (IZT). This specification is measured under standard conditions (TA = 25°C) and defines the device's primary regulation point in reverse-bias operation. The MMSZ4712 RHG achieves this voltage with low dynamic impedance and tight tolerance, making it suitable for precision reference applications.
What package type does the MMSZ4712 RHG use?
The MMSZ4712 RHG uses the SOD-123 surface-mount package, measuring 2.85 mm × 1.80 mm with a 1.25 mm height. Its cathode is marked by a visible band, and it features matte tin-plated leads compliant with J-STD-002 solderability standards. The MMSZ4712 RHG's SOD-123 outline matches JEDEC DO-215 variation AD and supports automated assembly on standard PCBs.
What is the maximum power dissipation rating for the MMSZ4712 RHG?
The MMSZ4712 RHG is rated for a steady-state power dissipation of 500 mW at TA = 25°C on a 5 cm × 5 cm copper pad. Derating is required above 25°C ambient, following the published power temperature curve-e.g., ~350 mW at 75°C ambient. This rating directly governs safe continuous clamp or regulation current in the MMSZ4712 RHG's operational envelope.
Does the MMSZ4712 RHG meet RoHS and halogen-free requirements?
Yes, the MMSZ4712 RHG is RoHS compliant and halogen-free per manufacturer specifications. Its molding compound meets UL 94V-0 flammability rating, and all materials conform to EU Directive 2011/65/EU and IEC 61249-2-21 standards. These attributes make the MMSZ4712 RHG suitable for environmentally regulated industrial and consumer products shipped globally.
What is the reverse leakage current specification for the MMSZ4712 RHG?
The MMSZ4712 RHG specifies a maximum reverse leakage current (IR) of 0.01 µA at VR = 21.2 V, measured at TA = 25°C. This ultra-low leakage ensures minimal parasitic current draw in high-impedance reference or standby circuits. The MMSZ4712 RHG maintains this performance across its qualified temperature range, supporting reliable operation in battery-powered and low-power systems.
MMSZ4712 RHG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 28 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 10 nA @ 21.2 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ4712 RHG FAQ
1.How can I place an order for MMSZ4712 RHG through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ4712 RHG 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 MMSZ4712 RHG reliable?
The price and inventory of MMSZ4712 RHG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ4712 RHG is usually 5 days.
3.What payment methods are accepted for MMSZ4712 RHG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ4712 RHG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ4712 RHG?
MMSZ4712 RHG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ4712 RHG 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 MMSZ4712 RHG?
For technical support, including MMSZ4712 RHG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ4712 RHG requirements.
6.How does Aetrix verify that MMSZ4712 RHG is sourced from the original manufacturer or authorized distributors?
All MMSZ4712 RHG 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 MMSZ4712 RHG meets industry standards.
7.What is the process for return or replacement of MMSZ4712 RHG?
All MMSZ4712 RHG units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ4712 RHG, 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 MMSZ4712 RHG part is unused and in its original packaging.
Return procedure for MMSZ4712 RHG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ4712 RHG Tags
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