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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

onsemi SZNZ9F6V8ST5G

Name: SZNZ9F6V8ST5G
Brand: onsemi
SKU: SZNZ9F6V8ST5G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SZNZ9F6V8ST5G

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: SOD-923

Datasheet:: SZNZ9F6V8ST5G.pdf

Description:: DIODE ZENER 6.8V 250MW SOD923

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Product details

Overview

SZNZ9F6V8ST5G from onsemi is a 250 mW, 6.65–6.93 V Zener voltage regulator diode in SOD-923 surface-mount package, designed for precision voltage clamping and ESD protection in space-constrained portable electronics. It delivers tight Zener tolerance (±3.5% at I_ZT = 5 mA), low dynamic impedance (40 Ω max at I_ZT), and Class 3 HBM ESD rating (>16 kV), enabling reliable operation in cellular phone power rails and high-density PCBs.

For engineers reviewing the SZNZ9F6V8ST5G datasheet, pinout, applications, or equivalent options, key selection criteria include its 6.65–6.93 V nominal Zener range, 250 mW steady-state dissipation, SOD-923 footprint (1.00 × 0.60 × 0.37 mm), −65 to +150 °C operating temperature, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This Zener diode operates in reverse breakdown mode with a specified test current of 5 mA and exhibits a maximum Zener impedance of 40 Ω at that condition. Its temperature coefficient is +1.2 mV/°C at I_ZT = 5 mA, indicating positive drift over temperature, and it maintains stable regulation down to 0.5 mA knee current (I_ZK) with Z_ZK ≤ 60 Ω.

The device uses a void-free thermosetting plastic case (UL 94 V-0 rated), matte tin lead finish, and meets MSL 1 reflow requirements (260 °C peak). Its 0.40 mm body height and 1.00 mm × 0.60 mm outline make it suitable for ultra-thin mobile applications where board space and profile are critical constraints.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	6.65–6.93 V at I_ZT = 5 mA - defines precise clamping threshold for overvoltage protection
Power Dissipation (P_D)	250 mW @ T_A = 25 °C - sets maximum continuous thermal load on FR-5 board
Zener Impedance (Z_ZT)	40 Ω max @ I_ZT = 5 mA - ensures minimal voltage deviation under dynamic load changes
ESD Rating (HBM)	Class 3 (>16 kV) - provides robust electrostatic discharge immunity without external protection
Junction Temp Range	−65 to +150 °C - supports operation in automotive under-hood and industrial environments
Package	SOD-923 (Case 514AB) - 1.00 × 0.60 × 0.37 mm footprint ideal for ultra-dense layouts
Temperature Coefficient	+1.2 mV/°C @ I_ZT = 5 mA - quantifies predictable positive V_Z drift across temperature

Pinout & Package

SZNZ9F6V8ST5G is housed in a 2-terminal SOD-923 plastic package with cathode marked by a polarity band. Mounting position is unrestricted, and the device complies with MSL 1 reflow profile (260 °C peak).

Pin/Terminal	Circuit Role	Design Meaning
1 (Cathode)	Reverse-biased Zener terminal	Connected to regulated node or signal line 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 Zener tolerance	±3.5% at I_ZT = 5 mA - reduces need for post-production calibration in voltage reference circuits
Low-profile packaging	0.37 mm height - enables use in <1.0 mm total stack-up assemblies such as slim smartphones
AEC-Q101 qualification	Automotive-grade reliability validation - supports deployment in infotainment and ADAS subsystems
Pb-free construction	100% matte Sn lead finish - satisfies RoHS and ELV compliance without solderability compromise
High ESD immunity	>16 kV HBM - eliminates need for discrete TVS in many I/O protection designs

Applications

USB Port ESD Protection	Smartphone Battery Monitoring
Use Scenario: Protecting USB 2.0 data lines from human-body ESD events during plug/unplug cycles. IC Role / Device Role / Timing Role: Zener clamp placed between D+ and D− lines and ground to shunt transients above 6.8 V. Use Value: Leverages SZNZ9F6V8ST5G's 16 kV HBM rating and 40 Ω Z_ZT to limit voltage excursion to <9 V during 8 kV contact discharge per IEC 61000-4-2.	Use Scenario: Stabilizing reference voltage for fuel-gauge ADC inputs monitoring Li-ion battery cell voltage. IC Role / Device Role / Timing Role: Precision Zener providing 6.8 V reference to ADC voltage divider network. Use Value: Achieves ±3.5% initial accuracy and +1.2 mV/°C TC ensures <±2% total error over −20 to +70 °C operating range.
Automotive Cabin Controller	Wearable Sensor Hub Power Rail
Use Scenario: Clamping 12 V supply rail transients in HVAC control modules exposed to load dump pulses. IC Role / Device Role / Timing Role: Secondary Zener limiter downstream of primary TVS, absorbing residual energy after main suppression. Use Value: SZNZ9F6V8ST5G's AEC-Q101 qualification and 250 mW rating allow sustained clamping of 100 ms pulses up to 15 V without degradation.	Use Scenario: Regulating 3.3 V LDO output in compact fitness trackers where board area is limited to 100 mm². IC Role / Device Role / Timing Role: Low-profile Zener used as feedback element in adjustable LDO compensation loop. Use Value: 1.00 × 0.60 mm SOD-923 footprint saves >40% board area versus standard SOD-123, enabling smaller form factor.

USB Port ESD Protection

Smartphone Battery Monitoring

Use Scenario: Protecting USB 2.0 data lines from human-body ESD events during plug/unplug cycles.

IC Role / Device Role / Timing Role: Zener clamp placed between D+ and D− lines and ground to shunt transients above 6.8 V.

Use Value: Leverages SZNZ9F6V8ST5G's 16 kV HBM rating and 40 Ω Z_ZT to limit voltage excursion to <9 V during 8 kV contact discharge per IEC 61000-4-2.

Use Scenario: Stabilizing reference voltage for fuel-gauge ADC inputs monitoring Li-ion battery cell voltage.

IC Role / Device Role / Timing Role: Precision Zener providing 6.8 V reference to ADC voltage divider network.

Use Value: Achieves ±3.5% initial accuracy and +1.2 mV/°C TC ensures <±2% total error over −20 to +70 °C operating range.

Automotive Cabin Controller

Wearable Sensor Hub Power Rail

Use Scenario: Clamping 12 V supply rail transients in HVAC control modules exposed to load dump pulses.

IC Role / Device Role / Timing Role: Secondary Zener limiter downstream of primary TVS, absorbing residual energy after main suppression.

Use Value: SZNZ9F6V8ST5G's AEC-Q101 qualification and 250 mW rating allow sustained clamping of 100 ms pulses up to 15 V without degradation.

Use Scenario: Regulating 3.3 V LDO output in compact fitness trackers where board area is limited to 100 mm².

IC Role / Device Role / Timing Role: Low-profile Zener used as feedback element in adjustable LDO compensation loop.

Use Value: 1.00 × 0.60 mm SOD-923 footprint saves >40% board area versus standard SOD-123, enabling smaller form factor.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX584C6V8LT1G	Same 6.8 V nominal, but 300 mW P_D, SOD-523 package (0.8 × 0.6 × 0.5 mm), Z_ZT = 50 Ω	Higher power margin but taller profile; less suitable for sub-0.4 mm height constraints	Select when higher pulse power handling is needed and height allowance permits
MMSZ4687T1G	6.8 V nominal, 500 mW P_D, SOD-123 package (3.7 × 1.6 × 1.1 mm), Z_ZT = 30 Ω	Lower Z_ZT but 3.7× larger footprint; not viable for ultra-dense layouts	Select when lowest impedance is prioritized and board space is available

Compared with BZX584C6V8LT1G and MMSZ4687T1G, SZNZ9F6V8ST5G offers the smallest height (0.37 mm) and best fit for thickness-critical designs, while trading off some power rating and impedance-making it optimal for portable consumer electronics where profile dominates.

Availability

SZNZ9F6V8ST5G is available at Aetrix Electronics and suitable for cellular phone ESD protection, wearable sensor hub power regulation, and automotive cabin controller voltage clamping requiring stable component supply and long-term lifecycle support.

Supply support for SZNZ9F6V8ST5G 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 NZ9F/SZNZ9F series was developed specifically for miniaturized voltage regulation and ESD protection in portable and automotive electronics, emphasizing ultra-small footprint, AEC-Q101 compliance, and tight parametric control.

FAQ

What is the Zener voltage tolerance of SZNZ9F6V8ST5G?

The SZNZ9F6V8ST5G has a Zener voltage tolerance of ±3.5% at I_ZT = 5 mA, corresponding to a guaranteed range of 6.65 V to 6.93 V. This tight tolerance is specified in the Electrical Characteristics table on page 3 of the onsemi datasheet and applies directly to the SZNZ9F6V8ST5G device marking "L". No derating or interpretation is required-the value is measured and binned during production.

Is SZNZ9F6V8ST5G qualified for automotive applications?

Yes, SZNZ9F6V8ST5G is AEC-Q101 qualified and PPAP capable, as explicitly stated in the datasheet's Specification Features section. 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-making SZNZ9F6V8ST5G suitable for non-safety-critical automotive subsystems like infotainment and body control modules.

What is the maximum junction temperature for SZNZ9F6V8ST5G?

The maximum junction temperature for SZNZ9F6V8ST5G is +150 °C, and the minimum is −65 °C, as defined in the Maximum Ratings table on page 1 of the datasheet. This range is validated under steady-state conditions and accounts for thermal resistance R_JA = 500 °C/W on FR-5 board. Operation beyond this range may cause irreversible damage or parametric shift, and derating must be applied above 25 °C ambient per the 2.0 mW/°C slope.

Does SZNZ9F6V8ST5G have a polarity marking, and how is it identified?

Yes, SZNZ9F6V8ST5G uses Style 1 marking per the Mechanical Case Outline drawing: Pin 1 (Cathode) is identified by a polarity band on the package body. The device marking "L" followed by a date code appears adjacent to the band. This matches the pin configuration shown in Figure 1 and the SOD-923 CASE 514AB outline-ensuring unambiguous orientation during automated placement and manual inspection of the SZNZ9F6V8ST5G.

What is the forward voltage specification for SZNZ9F6V8ST5G?

The forward voltage (V_F) of SZNZ9F6V8ST5G is specified as ≤ 0.9 V at I_F = 10 mA, consistent across the entire NZ9F/SZNZ9F series per the datasheet's note on page 2. This parameter is relevant when the device is used in forward conduction mode-for example, as a level-shifter or logic interface clamp-and confirms compatibility with 1.8 V and 3.3 V digital systems where low forward drop minimizes power loss and signal distortion.

SZNZ9F6V8ST5G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: SOD-923

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 6.8 V

Tolerance:: -

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 40 Ohms

Current - Reverse Leakage @ Vr:: 500 nA @ 3.5 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-923

SZNZ9F6V8ST5G FAQ

1.How can I place an order for SZNZ9F6V8ST5G through Aetrix?

Please submit a Request for Quotation (RFQ) for SZNZ9F6V8ST5G 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 SZNZ9F6V8ST5G reliable?

The price and inventory of SZNZ9F6V8ST5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZNZ9F6V8ST5G is usually 5 days.

3.What payment methods are accepted for SZNZ9F6V8ST5G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZNZ9F6V8ST5G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SZNZ9F6V8ST5G?

SZNZ9F6V8ST5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SZNZ9F6V8ST5G 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 SZNZ9F6V8ST5G?

For technical support, including SZNZ9F6V8ST5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZNZ9F6V8ST5G requirements.

6.How does Aetrix verify that SZNZ9F6V8ST5G is sourced from the original manufacturer or authorized distributors?

All SZNZ9F6V8ST5G 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 SZNZ9F6V8ST5G meets industry standards.

7.What is the process for return or replacement of SZNZ9F6V8ST5G?

All SZNZ9F6V8ST5G units undergo pre-shipment inspection (PSI). If there is an issue with SZNZ9F6V8ST5G, 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 SZNZ9F6V8ST5G part is unused and in its original packaging.

Return procedure for SZNZ9F6V8ST5G:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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