My Inquiry
My Account
onsemi MM3Z3V9ST1
- Part No.:
- MM3Z3V9ST1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MM3Z3V9ST1.pdf
- Description:
- DIODE ZENER 4.03V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,887
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MM3Z3V9ST1 from onsemi is a 3.9 V ±3.5% tolerance Zener diode in SOD−323 package, rated for 200 mW steady-state power dissipation, 90 Ω maximum Zener impedance at 5 mA test current, and 3.0 μA reverse leakage at 3.0 V, used for precision voltage regulation in space-constrained portable electronics.
For engineers reviewing the MM3Z3V9ST1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±3.5%), low-profile SOD−323 footprint (1.7 mm × 1.25 mm × 0.9 mm), ESD robustness (>16 kV HBM), thermal resistance (635 °C/W), and tight VZ temperature coefficient (−2.5 mV/°C).
Technical Context
This Zener regulator operates in reverse breakdown to clamp voltage with stable reference behavior across −65 °C to +150 °C junction temperature range. Its 5 mA test current and 90 Ω dynamic impedance ensure predictable regulation under moderate load transients.
The device features cathode polarity marking, Pb-free plating options, UL 94 V−0 flammability rating, and 260 °C soldering tolerance for reflow compatibility. It delivers 3.89–4.16 V nominal Zener voltage with −2.5 mV/°C temperature coefficient at IZT = 5 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.89–4.16 V at 5 mA - defines precise clamping threshold for low-voltage rail protection |
| Power Dissipation (PD) | 200 mW @ 25 °C - sets maximum continuous power handling on FR-4 PCB |
| Zener Impedance (ZZT) | ≤90 Ω @ 5 mA - ensures minimal output voltage variation during current changes |
| Reverse Leakage (IR) | ≤3.0 μA @ 3.0 V - guarantees low standby current in battery-powered systems |
| Temp Coefficient (dVZ/dT) | −2.5 mV/°C @ 5 mA - enables predictable drift compensation in temperature-sensitive circuits |
| Capacitance (C) | ≤450 pF @ 0 V, 1 MHz - limits high-frequency noise coupling in signal-path applications |
| ESD Rating | >16 kV per Human Body Model - provides robust handling without external protection |
Pinout & Package
SOD−323 surface-mount package: 1.7 mm × 1.25 mm body, 0.9 mm height, cathode marked by band. Compatible with standard reflow profiles (260 °C/10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Reverse-biased Zener terminal | Connected to regulated voltage node; polarity band identifies this terminal for correct orientation |
| 2 (Anode) | Reference ground return path | Typically tied to system ground or lower-potential rail to complete Zener conduction path |
Key Features
| Feature | Design Value |
|---|---|
| Tight Zener tolerance | ±3.5% at 5 mA - reduces calibration overhead in precision reference designs |
| Low-profile SOD−323 | 1.7 mm × 1.25 mm × 0.9 mm - enables placement in dense mobile PCB layouts |
| High ESD immunity | >16 kV HBM - eliminates need for supplemental ESD protection in handheld interfaces |
| Pb-free plating option | Sn-only or Pb−Sn leads - supports RoHS-compliant manufacturing without performance trade-off |
Applications
| Smartphone Power Rail Protection | USB-C Port Voltage Clamp |
|---|---|
Use Scenario: Protects 3.3 V I/O rails from transient overvoltage during hot-plug events in compact smartphone mainboards. IC Role / Device Role / Timing Role: Zener voltage clamp placed between VIO and GND to shunt surge energy before it reaches SoC pins. Use Value: 3.89–4.16 V breakdown range aligns with 3.3 V rail margin, while 200 mW rating handles short-duration ESD pulses without degradation. | Use Scenario: Stabilizes CC line voltage during USB-C cable insertion to prevent false detection or port latch-up. IC Role / Device Role / Timing Role: Low-capacitance (≤450 pF) Zener referenced to ground, limiting CC pin swing to safe levels. Use Value: 450 pF capacitance avoids signal integrity issues on 100 kHz CC communication, and −2.5 mV/°C tempco maintains accuracy across ambient temperature shifts. |
| Wearable Sensor Bias Reference | Industrial IoT Node LDO Input Clamp |
Use Scenario: Provides stable 3.9 V bias for MEMS accelerometer analog front-end in battery-operated fitness trackers. IC Role / Device Role / Timing Role: Shunt regulator supplying clean reference to sensor signal chain, operating at microamp-level quiescent current. Use Value: ≤3.0 μA leakage at 3.0 V minimizes battery drain, and SOD−323 size fits within 3 mm² board area constraints. | Use Scenario: Clamps input to 3.3 V LDO in remote environmental sensor nodes powered by variable solar harvesters. IC Role / Device Role / Timing Role: Pre-regulator protecting LDO input from voltage spikes exceeding absolute maximum ratings. Use Value: 90 Ω Zener impedance ensures fast response to input surges, and 635 °C/W thermal resistance allows reliable operation without heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B3V9,115 | Same 3.9 V nominal, ±5% tolerance, SOD-323, but higher ZZT (120 Ω) and lower ESD rating (8 kV HBM) | Less suitable for ESD-prone interfaces; acceptable where tighter VZ tolerance is not required | Select when cost sensitivity outweighs precision and ESD robustness needs |
| MMSZ4685T1G | 3.9 V nominal, ±5%, SOD-123 package (larger: 2.7 mm × 1.4 mm), 200 mW rating, ZZT = 100 Ω | Requires PCB layout change due to different footprint; better thermal dissipation (RJA ≈ 500 °C/W) | Choose when board space permits larger package and higher thermal margin is prioritized |
Compared with BZX384-B3V9,115 and MMSZ4685T1G, MM3Z3V9ST1 offers superior Zener voltage tolerance (±3.5% vs. ±5%), highest ESD immunity (>16 kV), and smallest footprint-making it optimal for miniaturized, high-reliability consumer electronics where precision and robustness are critical.
Availability
MM3Z3V9ST1 is available at Aetrix Electronics and suitable for smartphone power rail protection, USB-C port voltage clamp, and wearable sensor bias reference requiring stable component supply and consistent parametric performance across production lots.
Supply support for MM3Z3V9ST1 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 manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MM3ZxxxST1 series is designed for space-constrained voltage regulation and ESD protection in portable electronics, delivering tight-tolerance Zener performance in the industry's smallest standard surface-mount package.
FAQ
What is the exact Zener voltage range specified for MM3Z3V9ST1?
The MM3Z3V9ST1 has a guaranteed Zener voltage range of 3.89 V to 4.16 V when tested at 5 mA (IZT), per the official onsemi datasheet Rev. 15. This 3.9 V nominal rating with ±3.5% tolerance reflects tight process control optimized for precision reference applications, and the value is validated at TA = 25 °C with no derating applied.
Does MM3Z3V9ST1 support lead-free assembly processes?
Yes, MM3Z3V9ST1 is available in a Pb-free version denoted by the "G" suffix (e.g., MM3Z3V9ST1G), with Sn-only plating compliant with RoHS Directive 2011/65/EU. The device supports standard lead-free reflow profiles up to 260 °C for 10 seconds, and its SOD−323 package is qualified for both SnPb and Pb-free soldering without reliability degradation.
What is the maximum reverse leakage current for MM3Z3V9ST1 and at what condition?
The MM3Z3V9ST1 exhibits a maximum reverse leakage current (IR) of 3.0 μA when biased at 3.0 V (VR), as specified in the Electrical Characteristics table. This parameter is measured at TA = 25 °C and confirms low standby power consumption-critical for battery-powered devices using MM3Z3V9ST1 as a shunt reference or clamp.
How does the temperature coefficient of MM3Z3V9ST1 affect its performance in varying ambient conditions?
The MM3Z3V9ST1 has a temperature coefficient of −2.5 mV/°C at IZT = 5 mA, meaning its Zener voltage decreases by approximately 2.5 mV per degree Celsius rise in junction temperature. This predictable negative drift allows designers to compensate circuit thresholds in MM3Z3V9ST1-based references across −65 °C to +150 °C operating range without additional components.
Can MM3Z3V9ST1 be used as a substitute for older Zener diodes like 1N4728A in new designs?
No, MM3Z3V9ST1 is not a direct substitute for through-hole Zeners such as 1N4728A due to fundamental differences: MM3Z3V9ST1 is a 3.9 V, 200 mW SOD−323 surface-mount device with ±3.5% tolerance and −2.5 mV/°C tempco, whereas 1N4728A is a 3.3 V, 1 W DO-41 part with ±5% tolerance and different thermal characteristics. Board redesign and validation are required if replacing 1N4728A with MM3Z3V9ST1.
MM3Z3V9ST1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 4.03 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-323
MM3Z3V9ST1 FAQ
1.How can I place an order for MM3Z3V9ST1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MM3Z3V9ST1 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 MM3Z3V9ST1 reliable?
The price and inventory of MM3Z3V9ST1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM3Z3V9ST1 is usually 5 days.
3.What payment methods are accepted for MM3Z3V9ST1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM3Z3V9ST1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM3Z3V9ST1?
MM3Z3V9ST1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM3Z3V9ST1 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 MM3Z3V9ST1?
For technical support, including MM3Z3V9ST1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM3Z3V9ST1 requirements.
6.How does Aetrix verify that MM3Z3V9ST1 is sourced from the original manufacturer or authorized distributors?
All MM3Z3V9ST1 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 MM3Z3V9ST1 meets industry standards.
7.What is the process for return or replacement of MM3Z3V9ST1?
All MM3Z3V9ST1 units undergo pre-shipment inspection (PSI). If there is an issue with MM3Z3V9ST1, 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 MM3Z3V9ST1 part is unused and in its original packaging.
Return procedure for MM3Z3V9ST1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MM3Z3V9ST1 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…
