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onsemi SZMM5Z3V9T5G
- Part No.:
- SZMM5Z3V9T5G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
SZMM5Z3V9T5G.pdf
- Description:
- DIODE ZENER 3.9V 500MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:15,490
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Product details
Overview
SZMM5Z3V9T5G from onsemi is a 3.9 V ±5% 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 3 µA reverse leakage at 1 V, used for precision voltage regulation and overvoltage protection in space-constrained portable electronics.
For engineers reviewing the SZMM5Z3V9T5G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (250 °C/W), ESD rating (>16 kV HBM), AEC-Q101 qualification, and SOD-523 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal voltage reference diode with sharp reverse breakdown at nominal 3.9 V, designed for stable regulation under low-current conditions (IZT = 5 mA). Its temperature coefficient of −3.5 mV/°C ensures predictable drift across −65 °C to +150 °C junction range.
The SOD-523 package enables surface-mount integration with minimal board area (1.20 mm × 0.80 mm) and low profile (0.7 mm height), while its 100% matte tin lead finish supports lead-free reflow up to 260 °C and meets MSL 1 requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.7 V min / 3.9 V nom / 4.2 V max @ IZT = 5 mA - defines regulation band for precision clamping |
| Power Dissipation (PD) | 500 mW @ TA = 25 °C - sets maximum continuous thermal load on FR-4 board |
| Zener Impedance (ZZT) | 90 Ω max @ IZT = 5 mA - determines output voltage stability under dynamic load changes |
| Reverse Leakage (IR) | 3 µA max @ VR = 1 V - ensures low quiescent current in standby protection circuits |
| ESD Rating | Class 3 (>16 kV) per HBM - provides robust electrostatic immunity without external protection |
| Junction Temp Range | −65 °C to +150 °C - supports operation in automotive under-hood and industrial environments |
| Capacitance | 450 pF max @ VR = 0 V, f = 1 MHz - limits high-frequency noise coupling in signal-path protection |
Pinout & Package
SOD-523 ultra-small surface-mount plastic package (1.20 mm × 0.80 mm × 0.70 mm), void-free thermosetting epoxy case meeting UL 94 V-0, with cathode marked by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage rail; reverse-biased terminal during Zener operation |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential reference; completes conduction path during breakdown |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and infotainment power rails |
| Pb-Free & RoHS Compliant | Enables compliance with global environmental regulations and lead-free assembly processes |
| Low Profile SOD-523 | Reduces PCB real estate by >50% vs. SOD-123, critical for thin mobile and wearable designs |
| High ESD Robustness | Eliminates need for discrete TVS in many I/O line protection schemes due to >16 kV HBM rating |
| Stable Tempco | −3.5 mV/°C enables predictable voltage shift across operating temperature range |
Applications
| USB Power Rail Protection | Smartphone Battery Monitoring |
|---|---|
Use Scenario: Clamping transient spikes on 5 V USB VBUS lines during hot-plug events and ESD discharge. IC Role / Device Role: Primary overvoltage clamp protecting USB controller and PMIC inputs. Use Value: Prevents latch-up or damage to downstream ICs using only 3.9 V Zener threshold and 450 pF capacitance. |
Use Scenario: Providing stable reference for ADC measurement of lithium-ion battery cell voltage. IC Role / Device Role: Precision voltage reference source for analog front-end circuitry. Use Value: Enables ±5% regulation accuracy and <3 µA leakage to minimize battery drain during sleep mode. |
| Automotive Infotainment Display Bias | Wearable Sensor Signal Conditioning |
Use Scenario: Stabilizing bias voltage for OLED display driver ICs in vehicle dashboards. IC Role / Device Role: Local voltage regulator ensuring consistent pixel brightness across temperature. Use Value: −3.5 mV/°C tempco and AEC-Q101 qualification maintain display integrity from −40 °C to +85 °C ambient. |
Use Scenario: Protecting I²C bus lines and analog sensor outputs from ESD in compact fitness trackers. IC Role / Device Role: Bidirectional ESD clamp and DC-level shifter for low-voltage sensor interfaces. Use Value: 16 kV HBM rating and SOD-523 footprint allow direct placement adjacent to sensor IC pins. |
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 | 3.9 V ±5%, 300 mW rating, SOD-323 package (1.7 × 1.3 mm), 120 Ω ZZT | Lower power handling and larger footprint limit use in ultra-thin wearables | Select when cost sensitivity outweighs size constraints and thermal margin is sufficient |
| MMSZ5227BT1G | 3.9 V ±5%, 500 mW, SOD-123 package (3.7 × 1.6 mm), 15 Ω ZZT, −2.5 mV/°C tempco | Higher Zener conductance improves regulation but larger size conflicts with HDI PCBs | Prefer where tighter voltage stability under load variation is prioritized over board area |
Compared with BZX584-C3V9 and MMSZ5227BT1G, SZMM5Z3V9T5G delivers the smallest footprint and highest ESD rating among 3.9 V Zeners, making it optimal for space- and reliability-critical portable and automotive designs-though its higher ZZT requires verification in low-impedance regulation paths.
Availability
SZMM5Z3V9T5G is available at Aetrix Electronics and suitable for USB power protection, smartphone battery monitoring, and automotive infotainment display bias requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZMM5Z3V9T5G 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 is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMM5Z3V9T5G belongs to the MM5ZxxxT1G/SZMM5ZxxxT1G Zener regulator family, engineered specifically for miniaturized, high-reliability voltage reference and protection in portable and automotive electronics.
FAQ
What is the Zener voltage tolerance for SZMM5Z3V9T5G?
The SZMM5Z3V9T5G has a nominal Zener voltage of 3.9 V with a standard tolerance of ±5%, meaning the actual breakdown voltage falls between 3.7 V and 4.2 V when tested at 5 mA reverse current and 25 °C ambient temperature. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the onsemi datasheet.
Is SZMM5Z3V9T5G qualified for automotive applications?
Yes, SZMM5Z3V9T5G is AEC-Q101 qualified and PPAP capable, as explicitly stated in the datasheet's Specification Features section. The "SZ" prefix denotes compliance with automotive-specific site and control change requirements, enabling use in engine control units, body electronics, and infotainment systems.
What is the maximum power dissipation of SZMM5Z3V9T5G at 85 °C ambient?
At 85 °C ambient temperature, SZMM5Z3V9T5G's maximum power dissipation is derated to 260 mW. This is calculated from its 500 mW rating at 25 °C and 4.0 mW/°C derating factor: 500 mW − (85 − 25) × 4.0 mW = 260 mW, per the Maximum Ratings table in the datasheet.
Does SZMM5Z3V9T5G have a specified forward voltage?
Yes, SZMM5Z3V9T5G has a maximum forward voltage of 0.9 V at 10 mA forward current, as specified in the Electrical Characteristics table. This parameter applies to anode-to-cathode conduction and is relevant for polarity-checking or bidirectional ESD protection configurations.
What packaging option does SZMM5Z3V9T5G use?
SZMM5Z3V9T5G is supplied in tape-and-reel packaging with 8,000 units per reel, as indicated in the Ordering Information table. The "T5G" suffix denotes this high-volume packaging format, compatible with automated SMT placement equipment and conforming to onsemi's tape and reel specifications brochure BRD8011/D.
SZMM5Z3V9T5G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±6.41%
- 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 (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
SZMM5Z3V9T5G FAQ
1.How can I place an order for SZMM5Z3V9T5G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM5Z3V9T5G 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 SZMM5Z3V9T5G reliable?
The price and inventory of SZMM5Z3V9T5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM5Z3V9T5G is usually 5 days.
3.What payment methods are accepted for SZMM5Z3V9T5G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM5Z3V9T5G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM5Z3V9T5G?
SZMM5Z3V9T5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM5Z3V9T5G 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 SZMM5Z3V9T5G?
For technical support, including SZMM5Z3V9T5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM5Z3V9T5G requirements.
6.How does Aetrix verify that SZMM5Z3V9T5G is sourced from the original manufacturer or authorized distributors?
All SZMM5Z3V9T5G 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 SZMM5Z3V9T5G meets industry standards.
7.What is the process for return or replacement of SZMM5Z3V9T5G?
All SZMM5Z3V9T5G units undergo pre-shipment inspection (PSI). If there is an issue with SZMM5Z3V9T5G, 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 SZMM5Z3V9T5G part is unused and in its original packaging.
Return procedure for SZMM5Z3V9T5G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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