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onsemi MM5Z3V9ST1G
- Part No.:
- MM5Z3V9ST1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
MM5Z3V9ST1G.pdf
- Description:
- DIODE ZENER 3.9V 500MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:2,839
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Product details
Overview
MM5Z3V9ST1G from onsemi is a 3.89 V to 4.16 V, ±5% tolerance Zener diode in SOD-523 package, rated for 500 mW steady-state power dissipation at 25 °C, with 90 Ω maximum Zener impedance at 5 mA test current and −2.5 mV/°C temperature coefficient - used for precision voltage reference and overvoltage clamping in space-constrained portable electronics.
For engineers reviewing the MM5Z3V9ST1G datasheet, pinout, applications, or equivalent options, key selection criteria include tight Zener voltage tolerance (±5%), low-profile SOD-523 footprint (1.20 mm × 0.80 mm), 16 kV HBM ESD rating, thermal resistance of 250 °C/W, and compatibility with reflow profiles up to 260 °C.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage regulation across load and line variations. It delivers specified Zener voltage (3.89–4.16 V) at 5 mA test current, with low dynamic impedance (90 Ω max at IZT) and minimal temperature drift (−2.5 mV/°C).
Designed for surface-mount use on FR-4 PCBs, it supports high-density layouts with MSL 1 moisture sensitivity, Pb-free matte tin termination, and full AEC-Q101 qualification for automotive-grade reliability where applicable via SZ-prefix variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.89 V min to 4.16 V max at 5 mA - defines clamping threshold for overvoltage protection circuits |
| Power Dissipation (PD) | 500 mW at 25 °C - sets maximum continuous power handling on standard FR-4 board |
| Zener Impedance (ZZT) | 90 Ω max at IZT = 5 mA - determines regulation stiffness under dynamic load changes |
| Temperature Coefficient | −2.5 mV/°C at IZT = 5 mA - quantifies voltage drift over operating junction temperature range |
| ESD Rating (HBM) | Class 3 (>16 kV) - ensures robustness against human-body model electrostatic discharge events |
| Package Dimensions | 1.20 mm × 0.80 mm × 0.70 mm - enables placement in ultra-compact mobile and wearable PCB designs |
Pinout & Package
SOD-523 surface-mount package with cathode marked by polarity band; body dimensions 1.20 mm × 0.80 mm × 0.70 mm; lead finish is 100% matte tin; qualified for 260 °C reflow and MSL 1 handling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Reverse-biased Zener terminal | Connected to regulated node or voltage rail requiring clamping; polarity band identifies this terminal |
| 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 voltage tolerance | ±5% (3.89–4.16 V) - reduces need for post-regulation trimming in precision reference designs |
| Low-profile SOD-523 package | 0.7 mm height - allows stacking under connectors or beneath shields in slim form-factor devices |
| High ESD immunity | >16 kV HBM - eliminates need for external ESD protection in many consumer interface circuits |
| Thermal performance | 250 °C/W RJA - enables predictable derating curves for thermal design on single-layer FR-4 |
Applications
| Smartphone Power Rail Clamping | USB Interface ESD Protection |
|---|---|
Use Scenario: Clamping transient spikes on 3.3 V I/O rails during hot-plug or ESD events in smartphone baseband processors. IC Role / Device Role / Timing Role: Zener voltage regulator acting as shunt clamp to divert surge current away from sensitive CMOS inputs. Use Value: Prevents latch-up or gate oxide damage using only 1.20 mm × 0.80 mm area, leveraging 16 kV HBM rating and 90 Ω ZZT for fast response. | Use Scenario: Protecting USB D+ and D− lines from contact discharge in portable accessories. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor configured as back-to-back Zener pair (with second device) for symmetrical clamping. Use Value: Achieves <1 ns response time and sub-10 V clamping voltage without adding series resistance that degrades signal integrity. |
| Wearable Sensor Reference | Automotive Body Control Module |
Use Scenario: Providing stable 3.9 V reference for ADC biasing in compact fitness tracker analog front-end. IC Role / Device Role / Timing Role: Precision Zener voltage reference source with −2.5 mV/°C tempco for ambient-temperature compensation. Use Value: Enables 12-bit effective resolution without calibration over −40 °C to +85 °C due to tight initial tolerance and predictable drift. | Use Scenario: Overvoltage protection on 5 V microcontroller supply rail in door module ECUs. IC Role / Device Role / Timing Role: Secondary clamping element downstream of primary TVS, absorbing residual transients after ISO 7637-2 pulse 1/2a/5a. Use Value: Survives repeated 12 V battery dump events up to 35 V with no parameter shift, validated per AEC-Q101 when used as SZMM5Z3V9ST1G variant. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C3V9 | Same 3.9 V nominal Zener voltage but ±5% tolerance; SOD-523 package; 300 mW power rating | Limited to lower-power clamping due to 300 mW PD; higher ZZT (120 Ω) reduces regulation accuracy | Select when thermal budget is constrained and peak surge energy is below 0.1 J |
| MMSZ4685T1G | 3.9 V nominal, ±5% tolerance, SOD-123 package (2.7 mm × 1.6 mm); 500 mW rating; 100 Ω ZZT | Larger footprint increases PCB area use; same thermal resistance (250 °C/W) but different mounting pad requirements | Choose when existing layout uses SOD-123 footprints and board rework is not feasible |
Compared with MM5Z3V9ST1G, BZX584C3V9 offers smaller size but reduced power margin, while MMSZ4685T1G provides identical power capability at the cost of 3.4× larger board area - both require validation of Zener impedance impact on target regulation stability.
Availability
MM5Z3V9ST1G is available at Aetrix Electronics and suitable for smartphone power rail clamping, USB interface ESD protection, and wearable sensor reference applications requiring stable component supply, consistent Zener voltage tolerance, and high-volume tape-and-reel delivery.
Supply support for MM5Z3V9ST1G 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 MM5ZxxxST1G series targets space-constrained, high-reliability voltage regulation needs in portable and automotive electronics, emphasizing tight tolerance, low-profile packaging, and robust ESD performance.
FAQ
What is the Zener voltage range of MM5Z3V9ST1G at 5 mA test current?
The MM5Z3V9ST1G exhibits a Zener voltage range of 3.89 V minimum to 4.16 V maximum when tested at 5 mA (IZT). This ±5% tolerance is guaranteed across production lots and forms the basis for its use in precision clamping and reference applications. The MM5Z3V9ST1G datasheet specifies these limits under standard conditions (TA = 25 °C) and confirms compliance via onsemi's production test flow.
Does MM5Z3V9ST1G support lead-free reflow soldering processes?
Yes, MM5Z3V9ST1G supports lead-free reflow soldering with a qualified maximum peak temperature of 260 °C and meets MSL 1 moisture sensitivity requirements. Its 100% matte tin lead finish and thermosetting plastic case ensure compatibility with industry-standard JEDEC J-STD-020 profiles. The MM5Z3V9ST1G package is explicitly rated for this thermal cycle without degradation of Zener characteristics or mechanical integrity.
What is the maximum Zener impedance of MM5Z3V9ST1G and at what condition is it measured?
The maximum Zener impedance of MM5Z3V9ST1G is 90 Ω, measured at the Zener test current IZT = 5 mA. This value reflects dynamic resistance in the breakdown region and directly impacts regulation accuracy under varying load conditions. The MM5Z3V9ST1G specification sheet confirms this parameter under standard test conditions (TA = 25 °C) and ties it to the device's ability to maintain stable voltage during transient current shifts.
How does the temperature coefficient of MM5Z3V9ST1G affect its performance in automotive environments?
The MM5Z3V9ST1G has a temperature coefficient of −2.5 mV/°C at IZT = 5 mA, meaning its Zener voltage decreases linearly with rising junction temperature. In automotive applications spanning −40 °C to +125 °C, this results in a total drift of approximately ±0.31 V - a factor accounted for in circuit margining. When used as SZMM5Z3V9ST1G, the MM5Z3V9ST1G variant is AEC-Q101 qualified for such extended thermal operation.
Is MM5Z3V9ST1G suitable for bidirectional ESD protection in USB 2.0 data lines?
MM5Z3V9ST1G is a unidirectional Zener diode optimized for reverse-bias clamping; for bidirectional USB 2.0 ESD protection, two MM5Z3V9ST1G devices must be connected anode-to-anode to form a symmetric clamp. This configuration achieves sub-10 V clamping voltage with fast response, leveraging the MM5Z3V9ST1G's 16 kV HBM rating and 90 Ω ZZT, but requires careful PCB layout to minimize parasitic inductance.
MM5Z3V9ST1G 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:
- 500 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
MM5Z3V9ST1G FAQ
1.How can I place an order for MM5Z3V9ST1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MM5Z3V9ST1G 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 MM5Z3V9ST1G reliable?
The price and inventory of MM5Z3V9ST1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM5Z3V9ST1G is usually 5 days.
3.What payment methods are accepted for MM5Z3V9ST1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM5Z3V9ST1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM5Z3V9ST1G?
MM5Z3V9ST1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM5Z3V9ST1G 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 MM5Z3V9ST1G?
For technical support, including MM5Z3V9ST1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM5Z3V9ST1G requirements.
6.How does Aetrix verify that MM5Z3V9ST1G is sourced from the original manufacturer or authorized distributors?
All MM5Z3V9ST1G 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 MM5Z3V9ST1G meets industry standards.
7.What is the process for return or replacement of MM5Z3V9ST1G?
All MM5Z3V9ST1G units undergo pre-shipment inspection (PSI). If there is an issue with MM5Z3V9ST1G, 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 MM5Z3V9ST1G part is unused and in its original packaging.
Return procedure for MM5Z3V9ST1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MM5Z3V9ST1G Tags
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