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onsemi SZMM3Z4V3T1G
- Part No.:
- SZMM3Z4V3T1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SZMM3Z4V3T1G.pdf
- Description:
- DIODE ZENER 4.3V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:4,185
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Product details
Overview
SZMM3Z4V3T1G from onsemi is a 4.3 V ±0.3 V Zener voltage regulator diode in SOD−323 package, rated for 300 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 1.0 V reverse voltage; it provides precision voltage reference and overvoltage protection in space-constrained portable electronics.
For engineers reviewing the SZMM3Z4V3T1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, ESD robustness (Class 3, >16 kV HBM), automotive-grade AEC−Q101 qualification, and direct replacement guidance for compact DC biasing and voltage clamping circuits.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction, with nominal Zener voltage of 4.3 V measured at IZT = 5 mA under 25°C ambient conditions. Its temperature coefficient is −3.5 mV/°C, indicating predictable negative drift across −65°C to +150°C junction range.
The SOD−323 package enables surface-mount integration on high-density PCBs, with thermal resistance RJA = 416°C/W and soldering tolerance up to 260°C for 10 seconds. It exhibits 450 pF capacitance at 0 V bias and 1 MHz, making it suitable for low-frequency regulation rather than RF applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.0–4.6 V at IZT = 5 mA; ensures stable reference within ±7% tolerance for bias networks |
| Power Dissipation (PD) | 300 mW at TA = 25°C; supports continuous operation in handheld devices without forced cooling |
| Zener Impedance (ZZT) | ≤90 Ω at IZT = 5 mA; maintains tight regulation under dynamic load transients |
| Reverse Leakage (IR) | ≤3 µA at VR = 1.0 V; minimizes quiescent current in battery-powered systems |
| ESD Rating | Class 3 (>16 kV HBM); withstands handling and assembly without external protection |
| Junction Temp Range | −65°C to +150°C; qualified for under-hood automotive and industrial environments |
| Capacitance (C) | 450 pF at VR = 0 V, f = 1 MHz; limits use to DC/low-frequency signal paths only |
Pinout & Package
SOD−323 surface-mount package: 1.7 mm × 1.25 mm body, 0.9 mm height, cathode marked by polarity band. Mounting position unrestricted; Pb-free plating compatible with RoHS-compliant reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener breakdown terminal | Connected to regulated voltage node; polarity band identifies this terminal for correct orientation during placement |
| 2 (Anode) | Reference ground return | Typically tied to system ground or lower-potential rail; completes current path during reverse-bias conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 qualified | Validated for automotive applications including infotainment and body control modules |
| Low-profile SOD−323 | Enables placement on 0.5 mm pitch PCBs and inside stacked module assemblies |
| Stable −3.5 mV/°C TC | Allows predictable voltage shift compensation in temperature-critical sensor biasing |
| 4.5 mg unit weight | Reduces mechanical stress on fine-pitch solder joints in vibration-prone environments |
| UL 94 V−0 flammability | Meets safety requirements for enclosed consumer and medical portable enclosures |
Applications
| Cellular Phone Power Management | Automotive Infotainment Biasing |
|---|---|
Use Scenario: Providing stable 4.3 V reference for analog front-end ICs in LTE modem power sequencing. IC Role / Device Role / Timing Role: Zener voltage clamp regulating LDO input during cold-crank voltage dips. Use Value: Prevents brown-out resets by holding bias above 4.0 V threshold during transient 6 V–12 V supply excursions. | Use Scenario: Setting precise bias point for audio amplifier input stage in head-unit design. IC Role / Device Role / Timing Role: Two-terminal shunt regulator establishing DC operating point independent of supply ripple. Use Value: Reduces THD by stabilizing amplifier quiescent current despite 100 mVpp alternator noise on 12 V rail. |
| High-Density PC Board Clamping | Handheld Medical Sensor Interface |
Use Scenario: Protecting ADC input pins from ESD-induced overvoltage in compact IoT gateway PCB. IC Role / Device Role / Timing Role: Fast-response shunt clamp absorbing 15 kV HBM pulses before damage occurs. Use Value: Eliminates need for discrete TVS + RC filter, saving 1.2 mm² board area per protected node. | Use Scenario: Supplying calibrated reference voltage to potentiometric glucose sensor circuitry. IC Role / Device Role / Timing Role: Precision Zener element defining measurement baseline in ratiometric analog chain. Use Value: Enables ±1.5% full-scale accuracy over −20°C to +55°C operating range via known TC compensation. |
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-B4V3,115 | Same 4.3 V nominal Zener, but 300 mW rating at 25°C with 90 Ω ZZT; SOD-323 package, AEC-Q101 not claimed | Lacks automotive qualification documentation; suitable for commercial portable gear but not Tier-1 vehicle ECUs | Select when cost sensitivity outweighs formal PPAP compliance requirements |
| MMSZ4V3ET1G | Identical 4.0–4.6 V VZ range and 300 mW PD, but 115 Ω max ZZT at 5 mA; same SOD-323, AEC-Q101 qualified | Higher dynamic impedance reduces regulation fidelity under fast load steps; acceptable for static biasing only | Choose where tighter impedance is noncritical and second-source assurance is prioritized |
Compared with BZX384-B4V3,115 and MMSZ4V3ET1G, the SZMM3Z4V3T1G offers the lowest Zener impedance (90 Ω) among AEC-Q101-qualified 4.3 V SOD-323 Zeners, delivering superior line regulation in automotive power management and medical sensor interfaces requiring <±2% output stability.
Availability
SZMM3Z4V3T1G is available at Aetrix Electronics and suitable for cellular phone power management, automotive infotainment biasing, and high-density PC board clamping requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SZMM3Z4V3T1G 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 (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The SZMM3ZxxxT1G series belongs to onsemi's precision Zener regulator portfolio, engineered specifically for space-constrained, high-reliability applications demanding AEC-Q101 qualification, low-profile packaging, and stable voltage reference performance across extended temperature ranges.
FAQ
What is the Zener voltage tolerance of SZMM3Z4V3T1G?
The SZMM3Z4V3T1G has a Zener voltage range of 4.0 V to 4.6 V at IZT = 5 mA and TA = 25°C, corresponding to a ±7% tolerance around the nominal 4.3 V rating. This tolerance remains valid under specified thermal and current conditions per the official onsemi datasheet revision 11.
Is SZMM3Z4V3T1G suitable for automotive applications?
Yes, SZMM3Z4V3T1G is AEC−Q101 qualified and PPAP capable, with an SZ prefix denoting automotive-grade process controls and site-specific change management. Its −65°C to +150°C junction temperature range and Class 3 ESD rating meet requirements for engine bay and cabin electronics.
What is the maximum Zener impedance for SZMM3Z4V3T1G?
The maximum Zener impedance (ZZT) for SZMM3Z4V3T1G is 90 Ω, measured at IZT = 5 mA and TA = 25°C. This value reflects dynamic resistance under small-signal AC conditions and directly impacts regulation accuracy during load transients.
Does SZMM3Z4V3T1G have lead-free packaging?
Yes, SZMM3Z4V3T1G is supplied in a Pb−free SOD−323 package compliant with RoHS Directive 2011/65/EU. The device marking includes the "G" suffix, and leads are plated with pure tin (Sn-only), verified per onsemi's Pb−Free strategy documentation.
How does thermal derating affect SZMM3Z4V3T1G power handling?
SZMM3Z4V3T1G derates linearly above 25°C ambient: power dissipation decreases by 2.4 mW/°C. At 85°C ambient, its usable power drops to 156 mW (300 mW − 2.4 mW/°C × 60°C), requiring thermal layout validation for sustained operation in sealed enclosures.
SZMM3Z4V3T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±7%
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
SZMM3Z4V3T1G FAQ
1.How can I place an order for SZMM3Z4V3T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM3Z4V3T1G 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 SZMM3Z4V3T1G reliable?
The price and inventory of SZMM3Z4V3T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z4V3T1G is usually 5 days.
3.What payment methods are accepted for SZMM3Z4V3T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z4V3T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM3Z4V3T1G?
SZMM3Z4V3T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM3Z4V3T1G 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 SZMM3Z4V3T1G?
For technical support, including SZMM3Z4V3T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z4V3T1G requirements.
6.How does Aetrix verify that SZMM3Z4V3T1G is sourced from the original manufacturer or authorized distributors?
All SZMM3Z4V3T1G 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 SZMM3Z4V3T1G meets industry standards.
7.What is the process for return or replacement of SZMM3Z4V3T1G?
All SZMM3Z4V3T1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z4V3T1G, 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 SZMM3Z4V3T1G part is unused and in its original packaging.
Return procedure for SZMM3Z4V3T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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