My Inquiry
My Account
Taiwan Semiconductor Corporation MMSZ4705 RHG
- Part No.:
- MMSZ4705 RHG
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ4705 RHG.pdf
- Description:
- DIODE ZENER 18V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MMSZ4705 RHG from Taiwan Semiconductor is a 500mW surface-mount Zener diode with a nominal zener voltage of 18V (17.1–18.9V range), rated for junction temperatures up to +150°C, and housed in an SOD-123 package. It delivers precise voltage regulation and overvoltage protection in space-constrained power rails and signal conditioning circuits.
For engineers reviewing the MMSZ4705 RHG datasheet, MMSZ4705 RHG pinout, MMSZ4705 RHG application, or MMSZ4705 RHG equivalent, key selection criteria include its 18V nominal zener voltage at 50mA test current, 13.6μA leakage at 14.4V reverse bias, 340°C/W junction-to-ambient thermal resistance, and SOD-123 mechanical compatibility with high-density PCB layouts.
Technical Context
The MMSZ4705 RHG operates as a silicon planar Zener diode optimized for stable voltage reference and transient suppression in low-power DC circuits. Its electrical behavior is defined by a tightly controlled 17.1–18.9V zener voltage window at IZT = 50mA, with dynamic impedance and capacitance characteristics documented across temperature and bias conditions.
It complies with 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 - confirming suitability for automated assembly and long-term reliability in commercial-grade environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1–18.9V at 50mA test current - defines regulated output voltage tolerance under nominal bias |
| Power Dissipation (PD) | 500mW - maximum steady-state power handling on 5cm × 5cm Cu pad |
| Junction Temperature (TJ) | −55°C to +150°C - operational thermal envelope for embedded and industrial ambient conditions |
| Leakage Current (IR) | 13.6μA at 14.4V reverse bias - quantifies off-state conduction loss in precision reference paths |
| Thermal Resistance (RθJA) | 340°C/W - determines temperature rise above ambient per watt dissipated in standard layout |
| Package | SOD-123 - 2.85mm × 1.80mm footprint with cathode band polarity marking |
Pinout & Package
Package: SOD-123 - surface-mount plastic case with cathode indicated by a band; dimensions: 2.85mm × 1.80mm × 1.25mm (L × W × H); weight ≈10.97mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener breakdown reference node | Connected to lower-potential side of regulated rail; establishes reference ground path during reverse-bias operation |
| Cathode | Zener breakdown terminal / Voltage regulation output | Connected to higher-potential side; provides stable 18V reference when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| Constant voltage control | Enables stable 18V reference generation in feedback loops and voltage clamp networks |
| Moisture sensitivity level 1 | Eliminates bake requirements before reflow, supporting direct placement in J-STD-020-compliant SMT lines |
| RoHS and halogen-free compliance | Meets environmental regulations for consumer, industrial, and automotive electronics manufacturing |
| UL 94V-0 molding compound | Provides flame-retardant encapsulation essential for safety-critical board-level designs |
Applications
| Power Supply Voltage Clamp | Microcontroller I/O Protection |
|---|---|
Use Scenario: Clamping 24V supply rail transients to protect downstream 18V-tolerant circuitry. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to shunt excess energy above 18V threshold. Use Value: Limits peak voltage to ≤18.9V with 13.6μA leakage at 14.4V, minimizing standby power loss. | Use Scenario: Protecting 3.3V MCU GPIO pins from ESD or accidental 5V misconnection. IC Role / Device Role / Timing Role: Low-capacitance Zener acting as bidirectional clamp between I/O line and local ground. Use Value: Provides fast response with <100pF typical capacitance at 0V bias, preserving signal integrity. |
| Reference Voltage Source | Current-Limited LED Bias |
Use Scenario: Generating stable 18V reference for analog sensor excitation or ADC reference divider. IC Role / Device Role / Timing Role: Precision voltage reference element in low-current (<50mA) bias networks. Use Value: Maintains ±5% regulation window (17.1–18.9V) at 50mA, enabling repeatable analog scaling. | Use Scenario: Biasing high-brightness LEDs requiring constant 18V forward voltage in portable lighting. IC Role / Device Role / Timing Role: Series voltage limiter in constant-current LED driver feedback path. Use Value: Delivers predictable 18V clamping with 340°C/W thermal resistance, supporting thermal stability at 500mW. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C18 | Same 18V nominal zener voltage, but 300mW rating and SOD-323 package (smaller footprint) | Lower power handling limits use in >300mW clamp scenarios; tighter layout spacing required | Select when board area is constrained and power demand stays below 300mW |
| MMBZ5245B | 18V nominal zener, 350mW rating, SOT-23 package with three terminals (cathode/anode/NC) | Requires different footprint and routing; NC pin adds layout complexity without functional benefit | Prefer only if existing design already uses SOT-23 Zeners and thermal margin allows 350mW limit |
Compared with BZX584-C18 and MMBZ5245B, the MMSZ4705 RHG offers higher 500mW power capability in the widely adopted SOD-123 form factor - making it optimal for general-purpose 18V regulation where thermal headroom and assembly compatibility are prioritized over minimal footprint.
Availability
MMSZ4705 RHG is available at Aetrix Electronics and suitable for power supply clamping, microcontroller I/O protection, reference voltage sourcing, and current-limited LED bias applications requiring stable component supply and RoHS-compliant sourcing.
Supply support for MMSZ4705 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 devices, analog ICs, and power management solutions for industrial, computing, and consumer markets.
The MMSZ4678–MMSZ4716 series was designed to deliver cost-effective, high-reliability Zener diodes across 1.8–39V with consistent SOD-123 packaging and J-STD-020 Level 1 moisture handling for mainstream SMT production.
FAQ
What is the nominal zener voltage of the MMSZ4705 RHG?
The MMSZ4705 RHG has a nominal zener voltage of 18V, with a guaranteed range of 17.1V to 18.9V at a test current of 50mA. This specification is confirmed in the Electrical Specifications table of the official Taiwan Semiconductor datasheet (Version A2311), and defines the device's primary regulation point in reverse-bias operation.
What package type does the MMSZ4705 RHG use?
The MMSZ4705 RHG uses the SOD-123 surface-mount package, measuring 2.85mm × 1.80mm × 1.25mm with a cathode band for polarity identification. Its mechanical outline conforms to JEDEC DO-215, Variation AD, and supports standard reflow profiles per J-STD-020 Level 1 moisture sensitivity.
What is the maximum power dissipation rating for the MMSZ4705 RHG?
The MMSZ4705 RHG is rated for a maximum steady-state power dissipation of 500mW when mounted on a 5cm × 5cm copper pad, as specified in the Absolute Maximum Ratings table. Derating is required above +25°C ambient, following the published power temperature derating curve in the datasheet.
Does the MMSZ4705 RHG meet RoHS and halogen-free requirements?
Yes, the MMSZ4705 RHG is RoHS compliant and halogen-free, as explicitly stated in the Features section of the Taiwan Semiconductor datasheet. These attributes are verified through material declarations and support compliance with EU Directive 2011/65/EU and IPC-1752A reporting standards.
What is the leakage current specification for the MMSZ4705 RHG?
The MMSZ4705 RHG exhibits a maximum leakage current of 13.6μA at a reverse voltage of 14.4V (80% of nominal VZ), as listed in the Electrical Specifications table. This value reflects off-state conduction under sub-breakdown bias and is critical for low-power reference and protection designs.
MMSZ4705 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):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 1 µA @ 13.6 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ4705 RHG FAQ
1.How can I place an order for MMSZ4705 RHG through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ4705 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 MMSZ4705 RHG reliable?
The price and inventory of MMSZ4705 RHG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ4705 RHG is usually 5 days.
3.What payment methods are accepted for MMSZ4705 RHG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ4705 RHG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ4705 RHG?
MMSZ4705 RHG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ4705 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 MMSZ4705 RHG?
For technical support, including MMSZ4705 RHG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ4705 RHG requirements.
6.How does Aetrix verify that MMSZ4705 RHG is sourced from the original manufacturer or authorized distributors?
All MMSZ4705 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 MMSZ4705 RHG meets industry standards.
7.What is the process for return or replacement of MMSZ4705 RHG?
All MMSZ4705 RHG units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ4705 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 MMSZ4705 RHG part is unused and in its original packaging.
Return procedure for MMSZ4705 RHG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ4705 RHG Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
