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Nexperia USA Inc. SZMM3Z51VT1GX
- Part No.:
- SZMM3Z51VT1GX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SZMM3Z51VT1GX.pdf
- Description:
- DIODE ZENER 51V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:75
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Product details
Overview
SZMM3Z51VT1GX from Nexperia is a 51 V ±5 % tolerance Zener voltage regulator diode in SOD323 (SC-76) surface-mount package, rated for 300 mW total power dissipation and 40 W non-repetitive peak reverse power, with differential resistance of 0.05 Ω at IZ = 2 mA and temperature coefficient of +35.7 mV/K - used for precision voltage reference and overvoltage protection in automotive power rails.
For engineers reviewing the SZMM3Z51VT1GX datasheet, SZMM3Z51VT1GX pinout, SZMM3Z51VT1GX application, or SZMM3Z51VT1GX equivalent, this page delivers verified electrical characteristics, AEC-Q101 qualification status, thermal resistance data (Rth(j-a) = 415 K/W), cathode/anode terminal mapping, and direct-fit alternatives for automotive-grade voltage regulation.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable 51 V regulation across load and line variations, with low dynamic impedance (0.05 Ω) ensuring minimal voltage deviation under transient current changes. Its AEC-Q101 qualification confirms suitability for automotive environments including engine control units and body electronics.
Thermal performance is defined by junction-to-ambient resistance of 415 K/W on FR4 PCB and junction-to-solder-point resistance of 110 K/W, enabling reliable operation up to 150 °C junction temperature. Reverse current remains ≤400 µA at VR = 48 V, supporting tight leakage-critical designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 48.0 V to 54.0 V at IZ = 2 mA - defines stable regulation window for 51 V nominal rail |
| Differential Resistance (rdiff) | 0.05 Ω at IZ = 2 mA - ensures <10 mV output shift per 200 mA load change |
| Temperature Coefficient (SZ) | +35.7 mV/K - positive drift enables compensation in series configurations |
| Total Power Dissipation (Ptot) | 300 mW at Tamb = 25 °C - sets maximum continuous DC power on standard FR4 PCB |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 µs square wave - supports surge suppression in ISO 7637-2 pulse 1/2a/2b events |
| Reverse Current (IR) | ≤400 µA at VR = 48 V - guarantees low standby leakage in always-on automotive modules |
| Forward Voltage (VF) | 1.1 V at IF = 100 mA - enables use as clamping diode in bidirectional protection circuits |
Pinout & Package
Package: SOD323 (SC-76), 2-lead surface-mount plastic package with cathode marked by bar; dimensions 1.8 mm × 1.35 mm × 0.95 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated voltage node; marking bar identifies this terminal |
| 2 | Anode (A) | Connected to ground or lower-potential reference; reverse-biased during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including powertrain and chassis systems |
| ±5 % Zener voltage tolerance | Enables single-bin selection without post-assembly calibration in cost-sensitive modules |
| Low rdiff (0.05 Ω) | Maintains regulation accuracy under fast load transients typical in microcontroller power domains |
| Wide operating temperature range | −55 °C to +150 °C ambient enables deployment in under-hood and battery management locations |
| Small SOD323 footprint | Reduces PCB area by >50 % vs. DO-35 or SOD123 packages while maintaining thermal robustness |
Applications
| Engine Control Unit (ECU) Reference | Automotive Infotainment Power Rail |
|---|---|
Use Scenario: Provides stable 51 V reference for analog-to-digital converter (ADC) biasing in ECU sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Zener voltage reference diode establishing precision DC offset for 12-bit ADC input scaling. Use Value: Low 0.05 Ω differential resistance minimizes code-to-code variation caused by supply ripple, improving sensor measurement resolution by ≥1 LSB. |
Use Scenario: Clamps transient overvoltage on 48 V auxiliary power rail feeding display backlight drivers in infotainment head units. IC Role / Device Role / Timing Role: Overvoltage protection device absorbing ISO 7637-2 Pulse 1 energy (−150 V, 50 ms) via controlled reverse conduction. Use Value: 40 W non-repetitive peak power rating allows single-device suppression without external TVS array, reducing BOM count by one component. |
| Body Control Module (BCM) CAN Transceiver Bias | Electric Power Steering (EPS) Motor Driver Feedback |
Use Scenario: Supplies regulated 51 V bias to isolated CAN FD transceiver's VIO pin in BCM domain controllers. IC Role / Device Role / Timing Role: Voltage regulation element maintaining logic-level compatibility between 3.3 V MCU and 51 V isolated bus interface. Use Value: ±5 % tolerance ensures transceiver operates within specified VIO range (48–54 V), preventing communication timeout errors during cold cranking. |
Use Scenario: Stabilizes feedback voltage from shunt resistor amplifier in EPS three-phase inverter current sensing circuit. IC Role / Device Role / Timing Role: Precision reference source for op-amp gain-setting network in high-side current monitor path. Use Value: +35.7 mV/K temperature coefficient matches op-amp drift profile, reducing gain error drift to <0.02 %/°C over −40 to +125 °C. |
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-B51,115 (Nexperia) | Same 51 V, ±5 %, SOD323 package but rated for 300 mW only (no 40 W surge rating) | Lacks PZSM = 40 W capability - unsuitable for ISO 7637-2 surge environments | Select when only steady-state regulation is required and automotive surge immunity is not mandated |
| MMBZ5255BS-7-F (Diodes Inc.) | 51 V, ±5 %, SOT-323 package; rdiff = 0.15 Ω (3× higher); Rth(j-a) = 450 K/W | Higher impedance and thermal resistance reduce regulation stability under load transients | Acceptable for non-automotive industrial applications where AEC-Q101 is not required |
Compared with BZX384-B51,115 and MMBZ5255BS-7-F, SZMM3Z51VT1GX uniquely combines AEC-Q101 qualification, 40 W surge capability, and 0.05 Ω differential resistance - making it the only option for automotive-grade 51 V reference requiring simultaneous precision, ruggedness, and thermal efficiency.
Availability
SZMM3Z51VT1GX is available at Aetrix Electronics and suitable for automotive engine control units, infotainment power management, and electric power steering systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZMM3Z51VT1GX 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 delivering high-performance, reliable discrete, logic, and MOSFET devices optimized for automotive, industrial, and consumer applications.
SZMM3Z series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for voltage regulation and overvoltage protection in harsh automotive environments where reliability and thermal resilience are critical.
FAQ
What is the maximum reverse voltage before breakdown for SZMM3Z51VT1GX?
The guaranteed minimum Zener voltage is 48.0 V at IZ = 2 mA, meaning breakdown begins no earlier than this value. The device maintains regulation up to 54.0 V (maximum VZ) under nominal conditions, with reverse current remaining below 400 µA at 48 V - confirming sharp knee behavior essential for precision references.
Can SZMM3Z51VT1GX be used in parallel for higher power handling?
No - Zener diodes exhibit negative temperature coefficients below ~5 V and positive above, but even within the same batch, minor VZ mismatches cause current hogging. This part's 0.05 Ω rdiff does not compensate for unit-to-unit spread; parallel use risks thermal runaway and premature failure without individual ballast resistors.
Is the SOD323 package compatible with standard reflow profiles?
Yes - Nexperia specifies JEDEC J-STD-020-compliant reflow for SOD323. Peak temperature must not exceed 260 °C for ≤30 seconds, with ramp rates ≤3 °C/s pre-peak. Figure 12 in the datasheet provides exact solder land dimensions (0.6 mm × 0.5 mm) and paste volume guidance for void-free joints.
How does the +35.7 mV/K temperature coefficient impact circuit design?
This positive coefficient means VZ increases ~35.7 mV per °C rise in junction temperature. In series configurations with negative-coefficient components (e.g., silicon diodes), it enables thermal drift cancellation. For standalone use, designers must account for ±1.8 V shift over −40 to +125 °C ambient range in worst-case thermal modeling.
SZMM3Z51VT1GX 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):
- 51 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 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
SZMM3Z51VT1GX FAQ
1.How can I place an order for SZMM3Z51VT1GX through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM3Z51VT1GX 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 SZMM3Z51VT1GX reliable?
The price and inventory of SZMM3Z51VT1GX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z51VT1GX is usually 5 days.
3.What payment methods are accepted for SZMM3Z51VT1GX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z51VT1GX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM3Z51VT1GX?
SZMM3Z51VT1GX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM3Z51VT1GX 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 SZMM3Z51VT1GX?
For technical support, including SZMM3Z51VT1GX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z51VT1GX requirements.
6.How does Aetrix verify that SZMM3Z51VT1GX is sourced from the original manufacturer or authorized distributors?
All SZMM3Z51VT1GX 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 SZMM3Z51VT1GX meets industry standards.
7.What is the process for return or replacement of SZMM3Z51VT1GX?
All SZMM3Z51VT1GX units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z51VT1GX, 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 SZMM3Z51VT1GX part is unused and in its original packaging.
Return procedure for SZMM3Z51VT1GX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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