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onsemi MM5Z3V9ST1
- Part No.:
- MM5Z3V9ST1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
MM5Z3V9ST1.pdf
- Description:
- DIODE ZENER 3.9V 200MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:6,143
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Product details
Overview
MM5Z3V9ST1 from onsemi is a 3.89–4.16 V, 200 mW Zener diode in SOD−523 package, designed for precision voltage regulation and overvoltage protection in space-constrained portable electronics such as smartphones and high-density PCBs.
For engineers reviewing the MM5Z3V9ST1 datasheet, pinout, applications, or equivalent options, key selection criteria include its ±5% Zener tolerance at 5 mA, 90 Ω dynamic impedance at IZT, −2.5 mV/°C temperature coefficient, and Class 3 ESD rating (>16 kV HBM).
Technical Context
The MM5Z3V9ST1 operates as a two-terminal voltage reference device, maintaining stable reverse breakdown across ambient temperatures from −65°C to +150°C with a thermal resistance of 635°C/W. Its low 0.7 mm body height and 1.20 mm × 0.80 mm footprint support ultra-compact layout integration.
It delivers specified Zener voltage (3.89–4.16 V) at 5 mA test current, with maximum reverse leakage of 1.0 µA at VR = 3.0 V and forward voltage ≤0.9 V at 10 mA. Capacitance is capped at 450 pF at 0 V and 1 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.89–4.16 V at IZT = 5 mA - defines precise clamping threshold for 3.3 V rail protection |
| Power Rating (PD) | 200 mW at TA = 25°C - supports transient surge absorption without derating in handheld thermal envelopes |
| Zener Impedance (ZZT) | ≤90 Ω at IZT = 5 mA - ensures minimal voltage deviation under load variation |
| Temp. Coefficient (dVZ/dT) | −2.5 mV/°C - enables predictable drift compensation in battery-powered systems |
| ESD Rating (HBM) | Class 3 (>16 kV) - provides robust handling immunity during automated assembly and end-user operation |
| Capacitance (C) | ≤450 pF at VR = 0, f = 1 MHz - minimizes signal coupling in RF-adjacent bias networks |
Pinout & Package
SOD−523 surface-mount package: 1.20 mm × 0.80 mm body, 0.7 mm max height, matte tin lead finish, MSL 1 rated, reflow-compatible up to 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener anode connection point | Connected to regulated node; reverse-biased to conduct at VZ |
| 2 (Anode) | Zener cathode connection point | Typically grounded or tied to lower-potential rail for clamping reference |
Key Features
| Feature | Design Value |
|---|---|
| Tight VZ tolerance | ±5% at 5 mA - reduces binning needs and improves system-level voltage margin predictability |
| Pb−Free construction | 100% matte Sn lead finish - compliant with RoHS and JEDEC J-STD-020 reflow standards |
| Low-profile packaging | 0.7 mm max height - enables placement beneath connectors or under shields in slim mobile designs |
| High ESD robustness | >16 kV HBM - eliminates need for external ESD protection in front-end I/O rails |
Applications
| Smartphone Power Rail Clamping | USB Interface ESD Protection |
|---|---|
Use Scenario: Clamping transient spikes on 3.3 V PMIC output rails during hot-plug events or battery insertion. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing fast-response overvoltage clamp. Use Value: Prevents latch-up in downstream logic ICs by limiting rail excursion to ≤4.16 V with sub-ns response. | Use Scenario: Protecting USB D+ and D− lines from human-body-model ESD events in portable accessories. IC Role / Device Role / Timing Role: Low-capacitance Zener clamp placed in series with data lines. Use Value: Maintains signal integrity (≤450 pF) while absorbing >16 kV ESD pulses without degradation. |
| Wearable Sensor Bias Reference | IoT Node Battery Monitoring |
Use Scenario: Providing stable 3.9 V reference for analog front-end amplifiers in hearable devices. IC Role / Device Role / Timing Role: Precision voltage reference with low tempco (−2.5 mV/°C) for sensor excitation. Use Value: Enables <±1% measurement accuracy across −20°C to +70°C operating range. | Use Scenario: Monitoring Li-ion cell voltage via resistive divider with Zener-stabilized ADC reference. IC Role / Device Role / Timing Role: Low-power shunt reference stabilizing divider network against supply ripple. Use Value: Delivers stable 3.9 V reference at <1 µA leakage, extending battery life in always-on monitoring circuits. |
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-C3V9 | Same 3.9 V nominal, but ±5% tolerance at 5 mA; higher ZZK (150 Ω vs. 90 Ω); SOD-323 package (1.7 × 1.3 mm) | Larger footprint limits use in ultra-dense layouts; higher impedance reduces regulation fidelity under dynamic load | Prefer MM5Z3V9ST1 where board area <1.0 mm² is critical and low-Z performance is required |
| MMSZ4685 | 3.9 V nominal, ±5% at 20 mA; higher power (350 mW); SOD-123 package (3.7 × 1.6 mm); dVZ/dT = +2.5 mV/°C (opposite polarity) | Requires larger pad layout; positive tempco complicates thermal drift compensation in battery systems | Choose MM5Z3V9ST1 when thermal stability and miniaturization outweigh raw power handling needs |
Compared with BZX584-C3V9 and MMSZ4685, the MM5Z3V9ST1 offers superior space efficiency, tighter low-current impedance control, and negative temperature coefficient alignment with lithium battery voltage sag profiles-making it optimal for modern compact, battery-sensitive designs.
Availability
MM5Z3V9ST1 is available at Aetrix Electronics and suitable for smartphone power rail clamping, USB interface ESD protection, and wearable sensor bias reference requiring stable component supply and consistent Pb−Free compliance.
Supply support for MM5Z3V9ST1 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MM5Z3V9ST1 belongs to the MM5ZxxxST1 series of miniature Zener regulators, engineered specifically for voltage stabilization and ESD protection in space-constrained portable electronics.
FAQ
What is the Zener voltage tolerance of MM5Z3V9ST1 at its rated test current?
The MM5Z3V9ST1 has a Zener voltage tolerance of ±5% at IZT = 5 mA, yielding a guaranteed range of 3.89 V to 4.16 V. This tight tolerance supports accurate voltage clamping in 3.3 V system rails without additional calibration. The MM5Z3V9ST1's specification is validated per onsemi's published Electrical Characteristics table and applies directly to the SOD−523 packaged device.
Does MM5Z3V9ST1 support lead-free reflow soldering processes?
Yes, the MM5Z3V9ST1 features 100% matte tin lead finish and is qualified for peak reflow temperatures up to 260°C, meeting IPC/JEDEC J-STD-020 requirements. It is rated MSL 1 (unlimited floor life), eliminating bake requirements before assembly. The MM5Z3V9ST1's Pb−Free status is confirmed in the official onsemi datasheet revision 6.
What is the maximum reverse leakage current for MM5Z3V9ST1 at 3.0 V?
The MM5Z3V9ST1 exhibits a maximum reverse leakage current (IR) of 1.0 µA at VR = 3.0 V and TA = 25°C. This low leakage preserves battery life in always-on monitoring circuits and ensures minimal loading on high-impedance bias networks. The value is specified in the Electrical Characteristics table of the MM5Z2V4ST1 SERIES datasheet.
How does the temperature coefficient of MM5Z3V9ST1 affect its performance in battery-powered devices?
The MM5Z3V9ST1 has a temperature coefficient of −2.5 mV/°C at IZT = 5 mA, meaning its Zener voltage decreases slightly with rising temperature. This negative drift complements the natural voltage sag of lithium-ion batteries under load and elevated temperature, improving overall system-level regulation stability. The MM5Z3V9ST1's dVZ/dT is measured and documented in the datasheet's Electrical Characteristics table.
Is MM5Z3V9ST1 suitable for ESD protection on high-speed data lines like USB 2.0?
Yes, the MM5Z3V9ST1 is suitable for USB 2.0 ESD protection due to its low 450 pF capacitance at 0 V and 1 MHz, which avoids signal integrity degradation at 480 Mbps. Its >16 kV HBM ESD rating meets IEC 61000-4-2 Level 4 requirements. The MM5Z3V9ST1's performance in this role is validated in onsemi application notes for portable interface protection.
MM5Z3V9ST1 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):
- 3.9 V
- Tolerance:
- ±3%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 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
MM5Z3V9ST1 FAQ
1.How can I place an order for MM5Z3V9ST1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MM5Z3V9ST1 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 MM5Z3V9ST1 reliable?
The price and inventory of MM5Z3V9ST1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM5Z3V9ST1 is usually 5 days.
3.What payment methods are accepted for MM5Z3V9ST1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM5Z3V9ST1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM5Z3V9ST1?
MM5Z3V9ST1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM5Z3V9ST1 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 MM5Z3V9ST1?
For technical support, including MM5Z3V9ST1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM5Z3V9ST1 requirements.
6.How does Aetrix verify that MM5Z3V9ST1 is sourced from the original manufacturer or authorized distributors?
All MM5Z3V9ST1 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 MM5Z3V9ST1 meets industry standards.
7.What is the process for return or replacement of MM5Z3V9ST1?
All MM5Z3V9ST1 units undergo pre-shipment inspection (PSI). If there is an issue with MM5Z3V9ST1, 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 MM5Z3V9ST1 part is unused and in its original packaging.
Return procedure for MM5Z3V9ST1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MM5Z3V9ST1 Tags
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BZX84C3V3LT1G
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