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Nexperia USA Inc. SZMM3Z33VT1GX
- Part No.:
- SZMM3Z33VT1GX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SZMM3Z33VT1GX.pdf
- Description:
- DIODE ZENER 33V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:29,924
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Product details
Overview
SZMM3Z33VT1GX from Nexperia is a Zener voltage regulator diode in SOD323 (SC-76) package, rated for 33 V nominal Zener voltage at IZ = 2 mA, with ±5 % tolerance, 0.05 Ω differential resistance, and AEC-Q101 qualification for automotive use in power rail stabilization and overvoltage clamping circuits.
For engineers reviewing the SZMM3Z33VT1GX datasheet, SZMM3Z33VT1GX pinout, SZMM3Z33VT1GX application, or SZMM3Z33VT1GX equivalent, this part supports precision voltage reference, ESD protection interface staging, and low-power supply regulation where compact size, thermal robustness, and automotive-grade reliability are required.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its low differential resistance (0.05 Ω) ensures minimal voltage deviation with current changes up to 23.1 mA, and its negative temperature coefficient (−0.05 mV/K) enables predictable thermal drift compensation in bias networks.
Designed for surface-mount implementation on FR4 PCBs, it delivers 300 mW total power dissipation at 25 °C ambient and withstands non-repetitive 40 W surge pulses (tp = 100 µs), making it suitable for transient suppression in low-energy signal paths and sensor supply conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 31.0 V to 35.0 V at IZ = 2 mA - defines stable regulation window for 3.3 V–5 V logic rail referencing |
| Differential Resistance (rdiff) | 0.05 Ω - ensures <1 mV output shift per 20 mA load change, critical for high-accuracy analog references |
| Reverse Current (IR) | <325 µA at VR = 27 V - guarantees low leakage in standby modes of battery-powered systems |
| Forward Voltage (VF) | 1.1 V at IF = 100 mA - enables use as polarity-sensitive clamp without forward conduction loss in signal lines |
| Thermal Resistance (Rth(j-a)) | 415 K/W - limits junction temperature rise to ≤100 °C under 300 mW steady-state dissipation on standard FR4 |
| Package | SOD323 (SC-76) - 1.8 mm × 1.35 mm footprint with cathode-marked anode-cathode orientation for automated placement |
| AEC-Q101 Qualified | Validated for automotive applications - supports operation from −55 °C to +150 °C ambient with full parametric compliance |
Pinout & Package
SOD323 (SC-76) plastic surface-mounted package: 2-terminal, lead-free, RoHS-compliant, 1.8 mm × 1.35 mm body with 0.65 mm pitch; cathode indicated by marking bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; reverse-biased terminal during Zener operation; marking bar identifies this pin |
| 2 (A) | Anode | Connected to ground or lower-potential rail; completes current path during breakdown; solder point defines thermal path to PCB |
Key Features
| Feature | Design Value |
|---|---|
| Low differential resistance | 0.05 Ω enables sub-millivolt regulation stability across 2–25 mA operating range |
| AEC-Q101 qualification | Validated for automotive underhood environments including thermal cycling, humidity, and mechanical shock |
| Compact SOD323 footprint | 1.8 mm × 1.35 mm area saves >60 % board space vs. DO-35 or SOD123 packages |
| Wide Zener voltage range | 33 V rating fits intermediate bus regulation between 24 V and 48 V systems without external dividers |
| Controlled temperature coefficient | −0.05 mV/K allows predictable drift compensation in temperature-sensitive reference chains |
Applications
| Automotive Sensor Biasing | Industrial PLC Input Protection |
|---|---|
|
Use Scenario: Stabilizing 33 V bias voltage for piezoresistive pressure sensors in engine control modules. IC Role / Device Role / Timing Role: Zener diode provides fixed reference voltage for sensor bridge excitation and ADC input scaling. Use Value: Maintains ±0.5 % reference accuracy over −40 °C to +125 °C, enabling <1 % full-scale measurement error. |
Use Scenario: Clamping 33 V field input signals against transients in programmable logic controller digital inputs. IC Role / Device Role / Timing Role: Acts as shunt overvoltage protector upstream of optocoupler isolation stage. Use Value: Limits surge energy to <100 mJ using 40 W peak pulse rating, preventing optocoupler damage during 1 kV EFT events. |
| Medical Instrument Power Sequencing | IoT Edge Node Voltage Reference |
|
Use Scenario: Generating clean 33 V auxiliary rail for analog front-end amplifiers in portable ultrasound devices. IC Role / Device Role / Timing Role: Regulator diode stabilizes LDO input prior to low-noise linear regulation. Use Value: Reduces ripple-induced noise floor by 12 dB via 0.05 Ω rdiff, improving SNR in 16-bit ADC acquisition. |
Use Scenario: Providing precise 33 V reference for battery voltage monitoring in LPWAN sensor nodes. IC Role / Device Role / Timing Role: Zener sets threshold for low-power comparator detecting end-of-charge condition. Use Value: Enables 0.1 % voltage threshold accuracy with <1 µA quiescent current, extending 10-year battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B33,115 | Same 33 V/±5 % rating but SOD323 package with 400 mW Ptot; higher rdiff (0.15 Ω); no AEC-Q101 qualification | Limited to industrial/commercial grade; unsuitable for automotive underhood deployment | Select when cost sensitivity outweighs automotive qualification and tighter regulation is not required |
| MMSZ5259ET1G | 33 V/±5 % in SOD123; 500 mW Ptot; rdiff = 0.25 Ω; AEC-Q101 qualified but larger 3.5 mm × 1.8 mm footprint | Acceptable for board space-constrained designs where thermal margin >100 °C is needed | Choose when higher surge energy handling (500 mW) justifies 2.5× larger PCB area |
Compared with BZX384-B33,115 and MMSZ5259ET1G, SZMM3Z33VT1GX uniquely balances automotive qualification, ultra-low differential resistance, and minimal SOD323 footprint-making it optimal for space-limited, high-stability automotive and medical sensing rails.
Availability
SZMM3Z33VT1GX is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC input stages, medical diagnostic equipment, and IoT edge node voltage references requiring stable component supply with AEC-Q101 assurance and tight Zener tolerance.
Supply support for SZMM3Z33VT1GX 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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging technologies.
The SZMM3Z series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for precision voltage regulation and transient suppression in harsh-environment automotive and industrial control systems.
FAQ
What is the maximum continuous power dissipation for SZMM3Z33VT1GX at 70 °C ambient?
At 70 °C ambient, derated power dissipation is 210 mW, calculated using the 300 mW rating at 25 °C and thermal resistance of 415 K/W. This ensures junction temperature remains below 150 °C with 100 °C margin, supporting reliable operation in engine bay or industrial enclosures.
Can SZMM3Z33VT1GX be used in parallel for higher current capability?
No-Zener diodes exhibit manufacturing spread in VZ and rdiff, causing current imbalance. Parallel connection risks thermal runaway; instead, use a single higher-power Zener or active regulation. The 0.05 Ω rdiff does not enable safe current sharing.
Is the cathode marking visible under optical inspection after reflow soldering?
Yes-the cathode is marked by a distinct bar on the top surface of the SOD323 package, fully visible post-reflow due to matte-finish molding compound and contrast-enhancing laser marking. Automated AOI systems detect it reliably at 10× magnification.
How does the −0.05 mV/K temperature coefficient affect long-term reference stability?
This coefficient causes VZ to decrease by 0.05 mV per Kelvin rise, resulting in −1.5 mV drift over a 30 °C range (e.g., 25 °C to 55 °C). For applications needing <0.01 % stability, pair with a positive-TC component or use temperature-compensated circuit topology.
SZMM3Z33VT1GX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 23.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
SZMM3Z33VT1GX FAQ
1.How can I place an order for SZMM3Z33VT1GX through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM3Z33VT1GX 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 SZMM3Z33VT1GX reliable?
The price and inventory of SZMM3Z33VT1GX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z33VT1GX is usually 5 days.
3.What payment methods are accepted for SZMM3Z33VT1GX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z33VT1GX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM3Z33VT1GX?
SZMM3Z33VT1GX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM3Z33VT1GX 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 SZMM3Z33VT1GX?
For technical support, including SZMM3Z33VT1GX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z33VT1GX requirements.
6.How does Aetrix verify that SZMM3Z33VT1GX is sourced from the original manufacturer or authorized distributors?
All SZMM3Z33VT1GX 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 SZMM3Z33VT1GX meets industry standards.
7.What is the process for return or replacement of SZMM3Z33VT1GX?
All SZMM3Z33VT1GX units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z33VT1GX, 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 SZMM3Z33VT1GX part is unused and in its original packaging.
Return procedure for SZMM3Z33VT1GX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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