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Nexperia USA Inc. SZMM3Z39VT1GX
- Part No.:
- SZMM3Z39VT1GX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SZMM3Z39VT1GX.pdf
- Description:
- DIODE ZENER 39V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:127,721
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Product details
Overview
SZMM3Z39VT1GX from Nexperia is a Zener voltage regulator diode in SOD323 (SC-76) package, rated for 39 V nominal Zener voltage (37.0–41.0 V), 27.3 Ω typical differential resistance at IZ = 2 mA, ±5 % tolerance, 300 mW total power dissipation, and AEC-Q101 qualified for automotive use - deployed in precision voltage reference and overvoltage protection circuits.
For engineers reviewing the SZMM3Z39VT1GX datasheet, SZMM3Z39VT1GX pinout, SZMM3Z39VT1GX application, or SZMM3Z39VT1GX equivalent, this page delivers verified electrical characteristics, thermal behavior, junction-to-ambient resistance (415 K/W), cathode/anode terminal mapping, and direct-fit alternatives for automotive-grade voltage regulation design.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable DC voltage under varying load and temperature conditions. Its 39 V nominal working voltage is specified at IZ = 2 mA with a tight 37.0–41.0 V min/max range and low 27.3 Ω differential resistance, enabling high regulation accuracy in feedback paths.
Thermal performance is defined by Rth(j-a) = 415 K/W (FR4 PCB, single-sided copper) and Rth(j-sp) = 110 K/W (cathode solder point), supporting reliable operation up to Tj = 150 °C. It meets AEC-Q101 stress test requirements for automotive discrete semiconductors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 37.0–41.0 V at IZ = 2 mA - defines precise clamping threshold for 39 V nominal regulation |
| Differential Resistance rdiff | 27.3 Ω - ensures minimal output voltage shift under load current variation |
| Total Power Dissipation Ptot | 300 mW at Tamb = 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Non-repetitive Peak Reverse Power | 40 W (tp = 100 µs, square wave) - supports transient surge suppression without failure |
| Reverse Current IR | ≤ 130 µA at VR = 30 V - guarantees low leakage in standby or high-impedance bias networks |
| Temperature Coefficient SZ | −0.05 to +0.05 mV/K - enables stable regulation across −55 °C to +150 °C ambient range |
| Junction Temperature Tj | 150 °C max - confirms suitability for under-hood automotive environments |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic package with 2 leads; dimensions 1.8 × 1.35 × 0.95 mm (L × W × H); marking bar denotes cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; carries reverse-biased current during Zener conduction |
| 2 | Anode (A) | Connected to ground or lower-potential reference; completes reverse-bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics |
| Low differential resistance | 27.3 Ω at 2 mA enables <10 mV output deviation per 273 µA load change |
| Wide voltage range series | 37 types from 2.4 V to 75 V - allows standardized footprint reuse across multiple BOMs |
| Tight ±5 % tolerance | Reduces need for post-production trimming in voltage reference designs |
| Small SOD323 footprint | 1.8 × 1.35 mm saves PCB area in space-constrained modules like ADAS sensors |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Provides stable 39 V reference for analog front-end comparators monitoring battery-supplied 48 V subsystems. IC Role / Device Role / Timing Role: Zener voltage reference diode establishing precise clamping threshold for overvoltage detection circuitry. Use Value: Maintains regulation accuracy within ±1.95 V over temperature (−40 °C to +125 °C) due to low tempco and AEC-Q101 reliability. |
Use Scenario: Stabilizes excitation voltage for strain-gauge bridges in pressure transducers operating from unregulated 24 V rails. IC Role / Device Role / Timing Role: Precision shunt regulator delivering low-noise, low-drift bias voltage to bridge circuitry. Use Value: 27.3 Ω rdiff limits output voltage drift to <0.5 mV per 13.7 µA bridge current variation, improving measurement resolution. |
| Telecom Power Supply Monitoring | Medical Infusion Pump Safety Circuit |
Use Scenario: Clamps auxiliary 39 V rail in PoE-powered network switches to prevent downstream IC damage during surge events. IC Role / Device Role / Timing Role: Transient voltage suppressor operating in Zener mode during overvoltage faults. Use Value: Withstands 40 W non-repetitive surges (100 µs) while maintaining <100 ns response time to protect Ethernet PHYs. |
Use Scenario: Sets fail-safe shutdown threshold in microcontroller-based motor control loop when 39 V supply exceeds safe limit. IC Role / Device Role / Timing Role: Overvoltage detection element triggering hardware reset via comparator input. Use Value: ±5 % tolerance ensures deterministic trip point (37.05–40.95 V), eliminating software-based delay in critical safety path. |
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-B39,115 (Nexperia) | SOD323 package, same 39 V rating, but ±5 % tolerance and 300 mW Ptot; slightly higher rdiff (30 Ω) | Identical automotive qualification and thermal specs; optimized for cost-sensitive volume production | Select when board-level rework tolerance and legacy BOM compatibility are priorities |
| MMSZ4703T1G (ON Semiconductor) | SOD123 package (larger), 39 V nominal, ±5 %, 500 mW Ptot, rdiff = 35 Ω, no AEC-Q101 certification | Higher power handling but lacks automotive qualification; requires larger PCB footprint | Choose only for non-automotive industrial use where thermal margin >150 mW is required |
Compared with BZX384-B39,115, SZMM3Z39VT1GX offers marginally better regulation stability (27.3 Ω vs. 30 Ω rdiff) and identical AEC-Q101 compliance; versus MMSZ4703T1G, it trades 200 mW extra power for 40 % smaller footprint and guaranteed automotive qualification.
Availability
SZMM3Z39VT1GX is available at Aetrix Electronics and suitable for automotive ECU designs, industrial sensor signal conditioning, telecom power monitoring, and medical safety-critical circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZMM3Z39VT1GX 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 energy-efficient solutions.
SZMM3Z series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for stable voltage reference and overvoltage protection in harsh-environment automotive and industrial systems.
FAQ
What is the maximum continuous reverse current this Zener diode can handle at 39 V?
At 39 V reverse bias and Tamb = 25 °C, the device draws ≤130 µA (per Table 9). Continuous operation at full rated Zener voltage is limited by Ptot = 300 mW, allowing up to ~7.7 mA average current (300 mW ÷ 39 V) before exceeding thermal limits on standard FR4 PCB.
Does this part require external heat sinking in automotive under-hood applications?
No external heatsink is required. With Rth(j-a) = 415 K/W and Tj(max) = 150 °C, it sustains 300 mW dissipation up to Tamb ≈ 87 °C (150 − 415 × 0.3 = 25.5 °C margin). In typical under-hood environments (<105 °C ambient), derating to 220 mW ensures safe operation.
How does the 39 V Zener voltage tolerance affect system-level accuracy?
The ±5 % tolerance (37.0–41.0 V) translates to ±1.95 V absolute error at 25 °C. Combined with temperature coefficient of ±0.05 mV/K, worst-case drift over −40 °C to +125 °C adds ±8.25 mV, resulting in total uncertainty of ±1.958 V - sufficient for non-critical overvoltage detection but not for precision ADC references.
Can this diode be used in parallel for higher power handling?
Parallel operation is not recommended. Zener voltage mismatch between units causes current hogging, leading to thermal runaway. For >300 mW needs, use a single higher-power device (e.g., SOD123 or DO-214AC packages) or active regulation instead.
SZMM3Z39VT1GX 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):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 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
SZMM3Z39VT1GX FAQ
1.How can I place an order for SZMM3Z39VT1GX through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM3Z39VT1GX 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 SZMM3Z39VT1GX reliable?
The price and inventory of SZMM3Z39VT1GX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z39VT1GX is usually 5 days.
3.What payment methods are accepted for SZMM3Z39VT1GX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z39VT1GX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM3Z39VT1GX?
SZMM3Z39VT1GX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM3Z39VT1GX 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 SZMM3Z39VT1GX?
For technical support, including SZMM3Z39VT1GX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z39VT1GX requirements.
6.How does Aetrix verify that SZMM3Z39VT1GX is sourced from the original manufacturer or authorized distributors?
All SZMM3Z39VT1GX 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 SZMM3Z39VT1GX meets industry standards.
7.What is the process for return or replacement of SZMM3Z39VT1GX?
All SZMM3Z39VT1GX units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z39VT1GX, 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 SZMM3Z39VT1GX part is unused and in its original packaging.
Return procedure for SZMM3Z39VT1GX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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