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onsemi MM5Z43VT1
- Part No.:
- MM5Z43VT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
MM5Z43VT1.pdf
- Description:
- DIODE ZENER 43V 100MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:5,756
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Product details
Overview
MM5Z43VT1 from onsemi is a 43 V, 100 mW Zener voltage regulator diode in SOD−523 package, with nominal Zener voltage of 43 V at 1 mA test current, maximum Zener impedance of 150 Ω at IZT, and reverse leakage current ≤0.05 μA at 30.1 V; it provides precision voltage clamping in space-constrained power rail protection circuits for portable electronics.
For engineers reviewing the MM5Z43VT1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±7%), low-profile SOD−523 footprint (1.20 mm × 0.80 mm), Class 3 ESD rating (>16 kV HBM), thermal stability (tempco ±0.0376 %/°C), and compatibility with lead-free reflow up to 260°C.
Technical Context
The MM5Z43VT1 operates as a two-terminal shunt voltage regulator, conducting in reverse breakdown to clamp voltage across sensitive circuit nodes. Its design centers on stable Zener conduction at low test current (IZT = 1 mA), with specified Zener impedance (ZZT = 150 Ω) and knee impedance (ZZK = 500 Ω) defining regulation linearity under varying load conditions.
It features a thermally robust junction rated for −65°C to +150°C operation and meets MSL 1 moisture sensitivity requirements. The device uses void-free epoxy molding (UL 94 V−0), 100% matte tin lead finish, and is qualified for standard surface-mount reflow profiles up to 260°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 40 V to 46 V at IZT = 1 mA - defines clamping range for overvoltage protection in 3.3 V–5 V system rails. |
| Power Dissipation (PD) | 100 mW at TA = 25°C - limits continuous energy handling; derates linearly above 25°C ambient. |
| Zener Impedance (ZZT) | 150 Ω max at IZT = 1 mA - determines voltage deviation under dynamic load transients. |
| Reverse Leakage (IR) | ≤0.05 μA at VR = 30.1 V - ensures minimal standby current in battery-powered applications. |
| Temperature Coefficient | ±0.0376 %/°C - quantifies VZ drift over temperature; enables predictable clamping in industrial environments. |
| Capacitance (C) | 40 pF at VR = 0 V, f = 1 MHz - impacts high-frequency noise filtering capability in RF-adjacent circuits. |
| ESD Rating | Class 3 (>16 kV HBM) - supports robust handling in automated assembly and end-user environments. |
Pinout & Package
SOD−523 surface-mount package: ultra-compact 1.20 mm × 0.80 mm body with 0.7 mm height; anode and cathode terminals aligned along short edge; marked with "21" code per datasheet marking diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Reverse-biased Zener terminal | Connected to regulated node; conducts when voltage exceeds VZ, sinking excess current to ground. |
| 2 (Anode) | Reference/ground terminal | Typically tied to system ground or low-impedance return path; establishes reference potential for clamping action. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SOD−523 footprint | 1.20 mm × 0.80 mm × 0.70 mm - enables placement in high-density PCB areas where 0402 or larger packages are prohibitive. |
| Low-leakage Zener regulation | IR ≤ 0.05 μA at 30.1 V - minimizes quiescent current drain in always-on battery circuits. |
| High ESD robustness | Class 3 HBM (>16 kV) - eliminates need for external ESD protection in handheld interface lines. |
| Lead-free reflow compatible | Qualified to 260°C peak - supports standard Pb-free manufacturing without solder joint reliability risk. |
| Stable tempco performance | ±0.0376 %/°C - maintains <±3% VZ shift over −40°C to +85°C operating range. |
Applications
| USB Port Overvoltage Protection | Smartphone Battery Monitoring Circuit |
|---|---|
|
Use Scenario: Clamps transient surges on USB VBUS line during hot-plug events or adapter switching. IC Role / Device Role / Timing Role: Shunt regulator providing fast-response voltage limiting ahead of PMIC input. Use Value: Prevents damage to downstream USB controller ICs by holding VBUS ≤46 V during 100 ns–1 μs transients. |
Use Scenario: Stabilizes reference voltage for ADC measurement of Li-ion cell voltage in battery fuel gauges. IC Role / Device Role / Timing Role: Precision voltage reference source for analog front-end biasing. Use Value: Enables ±1% full-scale accuracy in 0–4.3 V battery sensing with <0.1 μA loading error. |
| IoT Sensor Node Power Rail Clamp | Industrial PLC Digital Input Protection |
|
Use Scenario: Protects 3.3 V MCU I/O pins from induced surges on long-wire sensor connections. IC Role / Device Role / Timing Role: Low-capacitance (40 pF) transient suppressor placed directly at pin entry. Use Value: Limits overshoot to <46 V while preserving signal integrity up to 10 MHz due to minimal parasitic capacitance. |
Use Scenario: Guards 24 V digital input channels against field-wiring faults and inductive kickback. IC Role / Device Role / Timing Role: Primary overvoltage clamp in series with current-limiting resistor. Use Value: Absorbs 100 mW surge energy without degradation, supporting EN 61000-4-5 Level 3 immunity compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C43 | 43 V nominal, 300 mW rating, SOD-323 package (1.7 mm × 1.3 mm) | Higher power handling but 2.5× larger footprint; less suitable for ultra-dense layouts | Select when >100 mW surge energy absorption is required and board area permits larger package. |
| MMSZ43ET1G | 43 V nominal, 500 mW rating, SOD-123 package (3.7 mm × 1.6 mm) | Higher PD and thermal mass, but incompatible with fine-pitch SMT lines designed for SOD−523 | Choose for legacy designs using SOD-123 footprints or where higher steady-state dissipation is needed. |
Compared with BZX584-C43 and MMSZ43ET1G, the MM5Z43VT1 delivers identical 43 V regulation in the smallest standardized footprint, enabling miniaturization-critical designs-though its 100 mW limit requires careful transient energy budgeting versus higher-power alternatives.
Availability
MM5Z43VT1 is available at Aetrix Electronics and suitable for USB power protection, smartphone battery monitoring, IoT sensor node clamping, and industrial PLC input protection requiring stable component supply and consistent SOD−523 form factor.
Supply support for MM5Z43VT1 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient innovation, delivering silicon solutions for automotive, industrial, cloud, and intelligent devices.
The MM5Z43VT1 belongs to the MM5ZxxxT1 series of miniature Zener regulators, engineered specifically for space-constrained consumer and portable electronics where ultra-low profile, high ESD resilience, and precise voltage clamping are essential.
FAQ
What is the Zener voltage tolerance of MM5Z43VT1?
The MM5Z43VT1 has a Zener voltage range of 40 V to 46 V at IZT = 1 mA, representing a ±7% tolerance around the nominal 43 V value. This tolerance is verified per the onsemi datasheet Electrical Characteristics table and applies under standard test conditions (TA = 25°C). Designers should account for this spread when setting overvoltage thresholds in protection circuits using MM5Z43VT1.
Can MM5Z43VT1 be used in lead-free reflow processes?
Yes, the MM5Z43VT1 is qualified for lead-free reflow with a maximum peak temperature of 260°C and meets MSL 1 requirements. Its matte tin lead finish and thermosetting epoxy package ensure reliable solder joint formation without delamination or voiding. This makes MM5Z43VT1 fully compatible with standard J-STD-020-compliant reflow profiles used in modern electronics manufacturing.
What is the maximum reverse leakage current for MM5Z43VT1?
The MM5Z43VT1 specifies a maximum reverse leakage current (IR) of 0.05 μA at VR = 30.1 V and TA = 25°C. This ultra-low leakage is critical for battery-powered applications where standby current must be minimized. The value is measured and guaranteed per the onsemi datasheet and remains stable across the device's operating temperature range.
How does the temperature coefficient affect MM5Z43VT1 performance?
The MM5Z43VT1 has a temperature coefficient of ±0.0376 %/°C, meaning its Zener voltage shifts by approximately ±0.016 V per °C change from 25°C. This results in a total VZ variation of less than ±3% over −40°C to +85°C, supporting stable clamping in industrial and automotive environments where thermal cycling occurs. This spec is confirmed in the datasheet's Electrical Characteristics table.
Is MM5Z43VT1 suitable for high-frequency signal line protection?
Yes, the MM5Z43VT1 exhibits 40 pF capacitance at VR = 0 V and f = 1 MHz, making it suitable for protecting low-speed digital and analog signal lines without introducing significant signal distortion. Its low capacitance preserves rise/fall times in interfaces up to ~10 MHz. For RF or high-speed data lines (>50 MHz), additional layout isolation or lower-capacitance TVS devices may be preferred-but MM5Z43VT1 remains effective for general-purpose I/O clamping.
MM5Z43VT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±7%
- Power - Max:
- 100 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
MM5Z43VT1 FAQ
1.How can I place an order for MM5Z43VT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MM5Z43VT1 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 MM5Z43VT1 reliable?
The price and inventory of MM5Z43VT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM5Z43VT1 is usually 5 days.
3.What payment methods are accepted for MM5Z43VT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM5Z43VT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM5Z43VT1?
MM5Z43VT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM5Z43VT1 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 MM5Z43VT1?
For technical support, including MM5Z43VT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM5Z43VT1 requirements.
6.How does Aetrix verify that MM5Z43VT1 is sourced from the original manufacturer or authorized distributors?
All MM5Z43VT1 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 MM5Z43VT1 meets industry standards.
7.What is the process for return or replacement of MM5Z43VT1?
All MM5Z43VT1 units undergo pre-shipment inspection (PSI). If there is an issue with MM5Z43VT1, 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 MM5Z43VT1 part is unused and in its original packaging.
Return procedure for MM5Z43VT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MM5Z43VT1 Tags
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