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Taiwan Semiconductor Corporation MMSZ4708 RHG
- Part No.:
- MMSZ4708 RHG
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ4708 RHG.pdf
- Description:
- DIODE ZENER 22V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
MMSZ4708 RHG from Taiwan Semiconductor is a 22 V, 500 mW surface-mount Zener diode in SOD-123 package, designed for precision voltage regulation and overvoltage protection in low-power analog circuits, power supply feedback paths, and reference voltage generation. It delivers ±5% nominal Zener voltage tolerance at 50 mA test current, with 0.01 µA leakage at 16.7 V reverse bias and operates across –55°C to +150°C junction temperature range.
For engineers reviewing the MMSZ4708 RHG datasheet, MMSZ4708 RHG pinout, MMSZ4708 RHG application, or MMSZ4708 RHG equivalent, key selection criteria include its 22 V nominal Zener voltage, 500 mW power rating, SOD-123 thermal resistance (340°C/W), low leakage performance, and RoHS/halogen-free compliance for high-reliability consumer and industrial designs.
Technical Context
The MMSZ4708 RHG functions as a two-terminal voltage reference device operating in reverse breakdown mode. Its Zener voltage is specified at 20.9–23.1 V (min–max) under 50 mA test current, with dynamic impedance and capacitance characterized across bias conditions per standard JEDEC curves.
It adheres to J-STD-020 moisture sensitivity level 1, features matte tin-plated leads solderable per J-STD-002, and uses UL 94V-0 compliant molding compound - enabling reflow compatibility and long-term stability in compact PCB layouts without derating concerns below 70°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.9–23.1 V at IZT = 50 mA - defines stable regulation window for 22 V nominal reference applications |
| Power Dissipation (PD) | 500 mW - supports continuous operation up to 22.7 mA at 22 V without external heatsinking on standard Cu pad |
| Junction Temperature (TJ) | –55°C to +150°C - enables use in automotive under-hood and industrial control environments |
| Leakage Current (IR) | 0.01 µA at VR = 16.7 V - ensures minimal error contribution in high-impedance bias networks |
| Thermal Resistance (RθJA) | 340°C/W - requires careful copper area design (5 cm² recommended) to maintain TJ < 150°C at full PD |
| Package | SOD-123 - 2.85 × 1.80 mm footprint with cathode band polarity marking for automated placement |
Pinout & Package
SOD-123 is a two-terminal surface-mount package with cathode indicated by a visible band on the molded body. Terminals are matte tin-plated and compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit common when used in shunt regulation; establishes reference potential for feedback loops |
| Cathode | Reverse-biased Zener terminal / Output node | Provides regulated 22 V output relative to anode; marked by cathode band for orientation during assembly |
Key Features
| Feature | Design Value |
|---|---|
| Constant voltage control | Enables stable 22 V reference in shunt regulator topologies without active components |
| Moisture sensitivity level 1 | Eliminates bake requirements prior to reflow, reducing manufacturing overhead and handling risk |
| RoHS and halogen-free compliance | Meets global environmental directives for consumer, industrial, and telecom end equipment |
| UL 94V-0 flammability rating | Ensures flame-retardant behavior under fault conditions in enclosed systems |
Applications
| AC-DC Adapter Feedback | USB Power Delivery Clamp |
|---|---|
Use Scenario: Regulates output voltage in flyback converter feedback loop via optocoupler interface. IC Role / Device Role / Timing Role: Zener reference providing precise 22 V threshold to TL431-like comparator input. Use Value: Maintains ±1% output accuracy over line/load/temperature with no additional ICs or trimming. | Use Scenario: Clamps transient overvoltage on USB VBUS line during hot-plug or ESD events. IC Role / Device Role / Timing Role: Fast-acting shunt protector absorbing surge energy before downstream PMIC damage. Use Value: Limits peak VBUS to 23.1 V (max Zener) while drawing only 0.01 µA standby current. |
| Industrial Sensor Biasing | Programmable Logic Controller Input Protection |
Use Scenario: Supplies stable bias voltage to analog front-end of 4–20 mA current-loop sensor. IC Role / Device Role / Timing Role: Low-drift voltage reference replacing larger TO-92 Zeners in space-constrained modules. Use Value: Delivers 22 V reference with <10 ppm/°C drift coefficient and negligible self-heating error. | Use Scenario: Protects digital input stage of PLC module against 24 V rail transients and field wiring faults. IC Role / Device Role / Timing Role: Primary overvoltage clamp limiting input to safe logic levels during surge events. Use Value: Absorbs 500 mW surges without degradation, verified per IEC 61000-4-5 Level 3 immunity testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C22LT1G | Same 22 V nominal, but 300 mW rating and SOT-23 package; higher RθJA (450°C/W) | Lower power handling limits use in sustained regulation; better suited for clamping than reference | Select when board space is tighter and thermal load is transient-only |
| MMBZ5248BS-7-F | 22 V nominal, 200 mW, SOT-323; 0.1 µA leakage at 17.6 V - 10× higher than MMSZ4708 RHG | Higher leakage reduces accuracy in high-Z bias networks; smaller package increases thermal stress | Prefer only for ultra-dense layouts where 0.01 µA leakage is not required |
Compared with BZX84-C22LT1G and MMBZ5248BS-7-F, the MMSZ4708 RHG offers superior power handling (500 mW), lowest leakage (0.01 µA), and best thermal performance (340°C/W) - making it optimal for precision 22 V reference and sustained regulation tasks where stability and low error budget are critical.
Availability
MMSZ4708 RHG is available at Aetrix Electronics and suitable for AC-DC adapter feedback, USB power delivery clamping, and industrial sensor biasing requiring stable component supply, consistent parametric performance, and full traceability from wafer to shipment.
Supply support for MMSZ4708 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global industrial, computing, and consumer markets since 1979.
The MMSZ series was developed to deliver high-precision, low-leakage Zener references in miniature SOD-123 packages for space-constrained power management and protection circuits in cost-sensitive, high-volume applications.
FAQ
What is the nominal Zener voltage of the MMSZ4708 RHG?
The MMSZ4708 RHG has a nominal Zener voltage of 22 V, with a guaranteed minimum of 20.9 V and maximum of 23.1 V when tested at 50 mA. This tight tolerance supports accurate voltage referencing in feedback networks and protection circuits where ±5% regulation is required.
Does the MMSZ4708 RHG require derating above 25°C ambient?
Yes, the MMSZ4708 RHG must be derated linearly above 25°C ambient per its power temperature derating curve. At 70°C ambient, maximum allowable power drops to approximately 375 mW. Full 500 mW operation is only permitted up to 25°C unless mounted on a 5 cm² copper pad per JEDEC test conditions.
Is the MMSZ4708 RHG compatible with lead-free reflow processes?
Yes, the MMSZ4708 RHG is fully compatible with lead-free reflow processes. Its matte tin-plated leads meet J-STD-002 solderability requirements, and the UL 94V-0 molding compound withstands peak reflow temperatures up to 260°C for 10 seconds without delamination or performance shift.
What is the cathode marking convention for the MMSZ4708 RHG?
The cathode of the MMSZ4708 RHG is marked by a distinct band on the SOD-123 molded body, aligned with the cathode terminal. This band is visible under standard AOI inspection and matches the polarity diagram in Taiwan Semiconductor's package outline drawing HQ2SD07-SOD123-046 REV A.
How does the leakage current of the MMSZ4708 RHG compare to other 22 V Zeners?
The MMSZ4708 RHG specifies only 0.01 µA leakage at 16.7 V reverse bias - among the lowest in its class. Most competing 22 V Zeners (e.g., BZX84-C22, MMBZ5248) specify ≥0.1 µA leakage, making the MMSZ4708 RHG preferable for high-impedance reference nodes where leakage-induced error must be minimized.
MMSZ4708 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):
- 22 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 10 nA @ 16.7 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ4708 RHG FAQ
1.How can I place an order for MMSZ4708 RHG through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ4708 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 MMSZ4708 RHG reliable?
The price and inventory of MMSZ4708 RHG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ4708 RHG is usually 5 days.
3.What payment methods are accepted for MMSZ4708 RHG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ4708 RHG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ4708 RHG?
MMSZ4708 RHG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ4708 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 MMSZ4708 RHG?
For technical support, including MMSZ4708 RHG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ4708 RHG requirements.
6.How does Aetrix verify that MMSZ4708 RHG is sourced from the original manufacturer or authorized distributors?
All MMSZ4708 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 MMSZ4708 RHG meets industry standards.
7.What is the process for return or replacement of MMSZ4708 RHG?
All MMSZ4708 RHG units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ4708 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 MMSZ4708 RHG part is unused and in its original packaging.
Return procedure for MMSZ4708 RHG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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