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onsemi SZMM5Z9V1ST1G
- Part No.:
- SZMM5Z9V1ST1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
SZMM5Z9V1ST1G.pdf
- Description:
- DIODE ZENER 9.1V 500MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:2,960
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Product details
Overview
SZMM5Z9V1ST1G from onsemi is a 9.1 V ±3.8% Zener diode in SOD-523 package, rated for 500 mW steady-state power dissipation, 15 Ω maximum Zener impedance at 5 mA test current, and 0.5 µA reverse leakage at 6.0 V, used for precision voltage regulation and overvoltage protection in space-constrained portable electronics.
For engineers reviewing the SZMM5Z9V1ST1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±3.8%), low-profile SOD-523 footprint (1.20 mm × 0.80 mm), AEC-Q101 qualification, 16 kV HBM ESD rating, and tight thermal coefficient (3.8 mV/°C).
Technical Context
This device operates as a two-terminal voltage reference with cathode-anode polarity, designed for reverse-bias regulation. Its 9.1 V nominal Zener voltage is specified at 5 mA test current (IZT), with 15 Ω dynamic impedance (ZZT) and 0.5 µA leakage (IR) at VR = 6.0 V - enabling stable clamping in low-power signal conditioning paths.
The SOD-523 package supports reflow soldering up to 260 °C and meets MSL 1 requirements. With −65 °C to +150 °C operating junction temperature range and 250 °C/W junction-to-ambient thermal resistance, it delivers reliable performance in thermally demanding handheld and automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.85 V to 9.23 V at IZT = 5 mA - defines precise clamping threshold for protection circuits |
| Zener Impedance (ZZT) | 15 Ω max at IZT = 5 mA - ensures minimal voltage deviation under load transients |
| Reverse Leakage (IR) | 0.5 µA max at VR = 6.0 V - guarantees low standby power loss in battery-powered systems |
| Power Dissipation (PD) | 500 mW at TA = 25 °C - supports continuous regulation without forced cooling on FR-4 PCB |
| ESD Rating | Class 3 (>16 kV HBM) - provides robust handling during assembly and end-use in consumer devices |
| Temp Coefficient (dVZ/dT) | +3.8 mV/°C at IZT = 5 mA - enables predictable drift compensation in temperature-varying applications |
| Capacitance (C) | 130 pF max at VR = 0 V, f = 1 MHz - limits high-frequency noise coupling in RF-adjacent layouts |
Pinout & Package
SOD-523 surface-mount package: 1.20 mm × 0.80 mm body, 0.70 mm height, matte tin lead finish, void-free thermosetting epoxy (UL 94 V-0), MSL 1, qualified for 260 °C reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-bias anode connection enables Zener conduction |
| 2 (Non-banded End) | Anode | Typically grounded or connected to lower-potential rail; completes bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| Tight Zener tolerance | ±3.8% at 9.1 V - reduces need for post-regulation trimming in production calibration |
| AEC-Q101 qualification | Automotive-grade reliability with PPAP capability - supports use in infotainment and body control modules |
| Pb-Free & RoHS compliant | 100% matte Sn finish, UL 94 V-0 epoxy - meets global environmental compliance without derating |
| Low-profile SOD-523 | 0.7 mm max height - enables placement beneath connectors or under shields in ultra-thin mobile designs |
| High ESD immunity | 16 kV HBM - eliminates need for external TVS in many USB, SIM, and button interface protection schemes |
Applications
| Smartphone Power Rail Protection | Automotive Infotainment I/O Clamping |
|---|---|
Use Scenario: Protecting 9 V supply rails feeding camera sensor interfaces against ESD and load dump spikes. IC Role / Device Role / Timing Role: Zener clamp placed between rail and ground to shunt transient energy before IC input stages. Use Value: 9.1 V breakdown precisely matches rail margin above 8.4 V Li-ion battery max, preventing false triggering while ensuring headroom. | Use Scenario: Safeguarding UART and CAN transceiver I/O pins in dashboard displays exposed to board-level ESD events. IC Role / Device Role / Timing Role: Bidirectional clamping element referenced to local ground, absorbing fast transients without affecting signal integrity. Use Value: 16 kV HBM rating and 130 pF capacitance avoid signal distortion on 1 Mbps UART lines while meeting ISO 10605 requirements. |
| Wearable Battery Monitoring | Industrial Sensor Signal Conditioning |
Use Scenario: Providing stable 9.1 V reference for ADC measurement of lithium polymer cell voltage in hearables. IC Role / Device Role / Timing Role: Precision voltage reference source for ratiometric sensing, replacing larger 3-pin shunt regulators. Use Value: ±3.8% tolerance and +3.8 mV/°C tempco enable <0.5% total error across −20 °C to +70 °C without software compensation. | Use Scenario: Regulating excitation voltage for 350 Ω strain gauges in compact load cells where PCB area is constrained. IC Role / Device Role / Timing Role: Low-noise, low-drift Zener regulator supplying constant current to bridge circuitry. Use Value: 15 Ω ZZT minimizes output impedance variation under 1–5 mA load changes, improving gauge linearity by >0.1% FS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C9V1LT1G | Same 9.1 V nominal, ±5% tolerance, 300 mW rating, SOD-523 package | Lower power rating limits use in sustained-clamp scenarios; higher ZZK (30 Ω) increases regulation error | Select when cost sensitivity outweighs precision and thermal margin requirements |
| MMSZ5240BT1G | 9.1 V nominal, ±5%, 500 mW, SOD-123 package (2.7 mm × 1.6 mm) | Larger footprint incompatible with ultra-dense layouts; same thermal resistance but higher mounting mass | Choose only if existing SOD-123 land pattern must be reused and board rework is prohibitive |
Compared with BZX584C9V1LT1G and MMSZ5240BT1G, SZMM5Z9V1ST1G offers tighter voltage tolerance (±3.8% vs. ±5%), superior thermal performance in minimal area (SOD-523), and automotive qualification - making it optimal for next-gen portable and automotive edge nodes where size, accuracy, and reliability are co-constrained.
Availability
SZMM5Z9V1ST1G is available at Aetrix Electronics and suitable for smartphone power rail protection, wearable battery monitoring, and automotive infotainment I/O clamping requiring stable component supply across high-mix, low-volume production runs.
Supply support for SZMM5Z9V1ST1G 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, with leadership in power management, analog, sensors, and connectivity.
SZMM5Z9V1ST1G belongs to the MM5ZxxxST1G/SZMM5ZxxxST1G series - a family of AEC-Q101-qualified, tight-tolerance Zener diodes engineered specifically for voltage regulation and ESD protection in space- and reliability-critical portable and automotive electronics.
FAQ
What is the Zener voltage tolerance of SZMM5Z9V1ST1G?
The SZMM5Z9V1ST1G has a Zener voltage tolerance of ±3.8% around its nominal 9.1 V rating, meaning the actual breakdown voltage falls between 8.85 V and 9.23 V when tested at 5 mA (IZT). This tight tolerance is confirmed in the Electrical Characteristics table on page 2 of the onsemi datasheet and enables accurate voltage clamping without post-production calibration. The SZMM5Z9V1ST1G achieves this spec using process-controlled doping and laser trimming during manufacturing.
Is SZMM5Z9V1ST1G qualified for automotive applications?
Yes, SZMM5Z9V1ST1G is AEC-Q101 qualified and PPAP capable, as explicitly stated in the "Specification Features" section of the onsemi datasheet. The "SZ" prefix denotes automotive and other applications requiring unique site and control change requirements. This qualification covers stress testing including temperature cycling, humidity bias, and mechanical shock - confirming suitability for under-hood and cabin electronics where reliability is mission-critical. The SZMM5Z9V1ST1G meets these standards in its native SOD-523 package.
What is the maximum power dissipation for SZMM5Z9V1ST1G at 75°C ambient?
At 75°C ambient temperature, the SZMM5Z9V1ST1G's maximum power dissipation is 300 mW. This is calculated using the 4.0 mW/°C derating factor from the Maximum Ratings table: 500 mW − (75 − 25) × 4.0 mW = 300 mW. The derating applies to FR-4 boards with single-sided 1 cm² copper pads, per Note 1. Exceeding this limit risks thermal runaway and permanent degradation of the SZMM5Z9V1ST1G's Zener characteristics.
Does SZMM5Z9V1ST1G have a defined forward voltage specification?
Yes, the SZMM5Z9V1ST1G has a maximum forward voltage (VF) of 0.9 V at 10 mA forward current (IF), as specified in both the "Electrical Characteristics" summary and footnote on page 2 of the onsemi datasheet. This parameter is consistent across the entire MM5ZxxxST1G/SZMM5ZxxxST1G series and reflects the diode's silicon junction behavior in forward conduction. While not its primary operating mode, this VF value matters for bidirectional ESD protection configurations where forward conduction may occur during negative transients.
What is the cathode identification method for SZMM5Z9V1ST1G?
The cathode of SZMM5Z9V1ST1G is identified by a polarity band (marking stripe) located at terminal 1, as shown in the "MARKING DIAGRAM" on page 4 and confirmed in the "Mechanical Characteristics" section. In the SOD-523 package, this band appears as a visible dark stripe near one end of the rectangular body. The datasheet explicitly states "PIN 1. CATHODE (POLARITY BAND)" - meaning correct orientation requires routing the banded end to the higher-potential node during reverse-bias operation. Misorientation renders the SZMM5Z9V1ST1G nonfunctional as a Zener regulator.
SZMM5Z9V1ST1G 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):
- 9.1 V
- Tolerance:
- ±2%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 200 nA @ 7 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
SZMM5Z9V1ST1G FAQ
1.How can I place an order for SZMM5Z9V1ST1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM5Z9V1ST1G 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 SZMM5Z9V1ST1G reliable?
The price and inventory of SZMM5Z9V1ST1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM5Z9V1ST1G is usually 5 days.
3.What payment methods are accepted for SZMM5Z9V1ST1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM5Z9V1ST1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM5Z9V1ST1G?
SZMM5Z9V1ST1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM5Z9V1ST1G 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 SZMM5Z9V1ST1G?
For technical support, including SZMM5Z9V1ST1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM5Z9V1ST1G requirements.
6.How does Aetrix verify that SZMM5Z9V1ST1G is sourced from the original manufacturer or authorized distributors?
All SZMM5Z9V1ST1G 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 SZMM5Z9V1ST1G meets industry standards.
7.What is the process for return or replacement of SZMM5Z9V1ST1G?
All SZMM5Z9V1ST1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMM5Z9V1ST1G, 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 SZMM5Z9V1ST1G part is unused and in its original packaging.
Return procedure for SZMM5Z9V1ST1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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