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Nexperia USA Inc. SZMM3Z9V1T1GX
- Part No.:
- SZMM3Z9V1T1GX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SZMM3Z9V1T1GX.pdf
- Description:
- DIODE ZENER 9.1V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:140
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Product details
Overview
SZMM3Z9V1T1GX from Nexperia is a Zener voltage regulator diode in SOD323 (SC-76) package, rated for 9.1 V nominal Zener voltage at 5 mA, with ±5 % tolerance, 0.5 Ω differential resistance, and AEC-Q101 qualification for automotive use. It delivers stable reference voltage in low-power biasing, overvoltage protection, and voltage clamping circuits.
For engineers reviewing the SZMM3Z9V1T1GX datasheet, SZMM3Z9V1T1GX pinout, SZMM3Z9V1T1GX application, or SZMM3Z9V1T1GX equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (110 K/W junction-to-solder-point), non-repetitive surge capability (40 W), and automotive-grade reliability under −55 °C to +150 °C ambient conditions.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled VZ = 8.56–9.55 V at IZ = 5 mA, exhibiting low dynamic impedance (rdiff ≤ 0.5 Ω) and positive temperature coefficient (+3.8 to +7.0 mV/K) across its operating current range. Its low capacitance (120 pF at 0 V, f = 1 MHz) supports high-frequency noise suppression.
Designed for surface-mount use on FR4 PCBs with single-sided copper, it achieves Rth(j-a) = 415 K/W (free air) and Rth(j-sp) = 110 K/W (cathode solder point), enabling reliable thermal performance in space-constrained automotive and industrial modules without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.56 V to 9.55 V at IZ = 5 mA - defines precise regulation window for 9.1 V nominal reference |
| Differential Resistance (rdiff) | ≤ 0.5 Ω - ensures minimal output voltage shift under load current variation |
| Power Dissipation (Ptot) | 300 mW at Tamb = 25 °C - sets continuous DC power limit on standard FR4 PCB |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 µs square wave - enables transient overvoltage clamping without failure |
| Temperature Coefficient (SZ) | +3.8 to +7.0 mV/K - quantifies VZ drift per degree Celsius rise in junction temperature |
| Junction Temperature (Tj) | −55 °C to +150 °C - supports operation in under-hood automotive environments |
| Reverse Current (IR) | ≤ 60 µA at VR = 7.06 V - confirms sharp knee and low leakage below breakdown |
Pinout & Package
Package: SOD323 (SC-76), 2-pin surface-mount plastic package with cathode marked by bar; footprint optimized for reflow and wave soldering per Nexperia Fig. 12/13.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased configuration enables Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics |
| ±5 % Zener voltage tolerance | Enables accurate voltage referencing without post-production trimming in cost-sensitive designs |
| Low rdiff (≤ 0.5 Ω) | Maintains regulation stability across ±10 mA load current changes in feedback networks |
| Small SOD323 footprint | Reduces PCB area by >50 % vs. DO-35 or SOD123 packages, supporting miniaturized modules |
| 415 K/W junction-to-ambient Rth | Permits natural convection cooling in sealed enclosures without forced airflow |
Applications
| Automotive Sensor Biasing | Industrial PLC Input Protection |
|---|---|
|
Use Scenario: Providing stable 9.1 V reference to analog front-end of pressure/temperature sensors in engine bay modules. IC Role / Device Role / Timing Role: Zener diode acts as precision shunt voltage reference and ESD clamp on sensor signal line. Use Value: Maintains sensor accuracy across −40 °C to +125 °C ambient while absorbing ISO 10605 pulses up to 40 W. |
Use Scenario: Clamping 24 V digital input lines against transients induced by relay switching in factory automation cabinets. IC Role / Device Role / Timing Role: Shunt limiter that diverts surge energy before reaching downstream optocoupler or MCU GPIO. Use Value: Limits voltage to ≤10 V during 100 µs surges, preventing latch-up in 3.3 V logic interfaces. |
| Consumer Power Adapter Feedback | Medical Diagnostic Equipment Reference |
|
Use Scenario: Setting feedback threshold in secondary-side regulation loop of isolated AC/DC adapters for USB-C PD chargers. IC Role / Device Role / Timing Role: Precision voltage reference for TL431-like comparator circuitry in flyback controllers. Use Value: Delivers <±1% total error (including tempco and tolerance) over full operating temperature range. |
Use Scenario: Generating calibrated bias voltage for photodiode amplifiers in portable ultrasound probe front-ends. IC Role / Device Role / Timing Role: Low-noise, low-capacitance (120 pF) voltage reference stabilizing transimpedance amplifier gain. Use Value: Enables sub-10 nA dark current measurement fidelity by minimizing reference-induced leakage paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B9V1,115 (Nexperia) | SOD323 package, same 9.1 V rating, but ±2 % tolerance and higher rdiff (1.0 Ω) | Higher precision required where tighter VZ drift matters more than surge robustness | Select when ±2 % initial accuracy outweighs need for 40 W pulse handling |
| MMBZ5240BS-7-F (Diodes Inc.) | SOT-323 package, 9.1 V, ±5 %, but PZSM = 25 W and Rth(j-sp) = 130 K/W | Lower surge rating limits use in high-energy transient environments like CAN bus nodes | Choose only if existing SOT-323 footprint reuse is mandatory and surge exposure is low |
Compared with BZX384-B9V1,115 and MMBZ5240BS-7-F, SZMM3Z9V1T1GX offers superior surge immunity (40 W vs. 25–30 W) and thermal coupling (110 K/W vs. ≥130 K/W), making it preferred for automotive and industrial edge-node protection where reliability under stress is critical.
Availability
SZMM3Z9V1T1GX is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O protection, and medical diagnostic equipment requiring stable component supply with AEC-Q101 compliance and traceable sourcing.
Supply support for SZMM3Z9V1T1GX 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 leading Dutch semiconductor manufacturer specializing in high-performance, high-reliability discrete and logic devices, with global manufacturing and R&D centers.
The SZMM3Z series targets automotive and industrial applications demanding AEC-Q101 qualification, small form factor, and robust transient handling-designed specifically for voltage reference and clamping in harsh-environment electronics.
FAQ
What is the maximum continuous forward current for SZMM3Z9V1T1GX?
The device is not intended for continuous forward conduction; its absolute maximum forward current is 200 mA per Table 5, but typical operation occurs in reverse breakdown. Forward voltage is specified at 100 mA pulse (≤300 µs), yielding ≤1.1 V - sustained forward bias risks thermal runaway and permanent damage.
Can SZMM3Z9V1T1GX replace older DO-35 Zeners in legacy designs?
No direct drop-in replacement exists due to SOD323's 1.35 mm × 0.85 mm footprint versus DO-35's axial leads. PCB redesign is required. However, its 9.1 V regulation, ±5 % tolerance, and 300 mW dissipation match common DO-35 equivalents like 1N4739A, enabling functional upgrade with improved thermal performance and AEC-Q101 compliance.
How does the temperature coefficient affect regulation accuracy over temperature?
With SZ = +3.8 to +7.0 mV/K, VZ increases ~0.6 V from −40 °C to +125 °C ambient (ΔT ≈ 165 K). Combined with ±5 % initial tolerance, total VZ variation remains within ±8 % across full range - acceptable for non-critical biasing but insufficient for metrology-grade references.
Is lead-free reflow soldering supported for this device?
Yes. The SOD323 package is qualified for lead-free reflow per J-STD-020, with peak temperature up to 260 °C. Figure 12 specifies solder land dimensions (0.5 mm × 1.1 mm per pad) and paste volume; thermal profile must limit time above 220 °C to ≤60 seconds to avoid delamination or parametric shift.
SZMM3Z9V1T1GX 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):
- 9.1 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 6 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
SZMM3Z9V1T1GX FAQ
1.How can I place an order for SZMM3Z9V1T1GX through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM3Z9V1T1GX 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 SZMM3Z9V1T1GX reliable?
The price and inventory of SZMM3Z9V1T1GX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z9V1T1GX is usually 5 days.
3.What payment methods are accepted for SZMM3Z9V1T1GX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z9V1T1GX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM3Z9V1T1GX?
SZMM3Z9V1T1GX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM3Z9V1T1GX 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 SZMM3Z9V1T1GX?
For technical support, including SZMM3Z9V1T1GX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z9V1T1GX requirements.
6.How does Aetrix verify that SZMM3Z9V1T1GX is sourced from the original manufacturer or authorized distributors?
All SZMM3Z9V1T1GX 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 SZMM3Z9V1T1GX meets industry standards.
7.What is the process for return or replacement of SZMM3Z9V1T1GX?
All SZMM3Z9V1T1GX units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z9V1T1GX, 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 SZMM3Z9V1T1GX part is unused and in its original packaging.
Return procedure for SZMM3Z9V1T1GX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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