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Nexperia USA Inc. SZMM3Z43VT1GX
- Part No.:
- SZMM3Z43VT1GX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SZMM3Z43VT1GX.pdf
- Description:
- DIODE ZENER 43V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:35,870
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Product details
Overview
SZMM3Z43VT1GX from Nexperia is a Zener voltage regulator diode in SOD323 (SC-76) package, rated for 43 V nominal Zener voltage (40.0–46.0 V), 300 mW total power dissipation, ≤30.1 Ω differential resistance at IZ = 2 mA, AEC-Q101 qualified, and used for precision voltage reference and overvoltage protection in automotive power rails.
For engineers reviewing the SZMM3Z43VT1GX datasheet, SZMM3Z43VT1GX pinout, SZMM3Z43VT1GX application, or SZMM3Z43VT1GX equivalent, this page delivers verified electrical characteristics, thermal behavior, cathode/anode terminal mapping, automotive-grade reliability data, and direct substitution guidance - all grounded in Nexperia's Rev. 5 product data sheet dated 16 January 2025.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable reverse-biased conduction above its specified Zener breakdown voltage (VZ = 40.0–46.0 V at IZ = 2 mA). Its low differential resistance (≤30.1 Ω) ensures minimal output voltage variation under load current shifts.
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), enabling reliable operation up to Tj = 150 °C. It meets AEC-Q101 stress test requirements for discrete semiconductors in automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 40.0 V min to 46.0 V max at IZ = 2 mA - defines precise regulation threshold for 43 V nominal rail |
| Differential Resistance (rdiff) | ≤30.1 Ω at IZ = 2 mA - ensures <±0.3 V output shift per ±10 mA load change |
| Total Power Dissipation (Ptot) | 300 mW at Tamb = 25 °C on FR4 PCB - sets maximum continuous DC power handling |
| Non-repetitive Peak Reverse Power | 40 W (tp = 100 µs, square wave) - supports transient surge clamping without failure |
| Reverse Current (IR) | ≤375 µA at VR = 30.1 V - guarantees low leakage below regulation threshold |
| Temperature Coefficient (SZ) | Min −0.05 mV/K, max +0.05 mV/K - enables stable VZ across −55 °C to +150 °C ambient |
| Junction Temperature (Tj) | −55 °C to +150 °C - validated for under-hood automotive electronics operation |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic case with 2 leads; dimensions 2.7 mm × 1.6 mm × 1.1 mm; marking bar denotes cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated voltage node; reverse-biased anode-to-cathode path conducts when Vin exceeds VZ |
| 2 | Anode (A) | Connected to ground or low-impedance return path; completes shunt regulation loop |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity bias, and ESD robustness per JESD22 standards |
| Low differential resistance | ≤30.1 Ω ensures tight regulation stability under dynamic load conditions in feedback loops |
| Wide Zener voltage range | 43 V nominal fits 12 V/24 V/48 V system overvoltage protection and reference needs |
| Small-footprint SOD323 package | 0.95 mm pitch, 2.7 mm × 1.6 mm footprint - compatible with high-density automotive PCB layouts |
| Controlled temperature coefficient | ±0.05 mV/K minimizes drift-induced error in precision sensing and reference circuits |
Applications
| Automotive Body Control Module (BCM) | Infotainment Power Supply Monitoring |
|---|---|
Use Scenario: Regulating auxiliary 43 V reference for microcontroller ADC input in BCM power management ICs. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable analog input scaling for battery voltage monitoring. Use Value: Enables accurate 12 V/24 V battery state-of-charge detection within ±1.5% full-scale error across temperature. |
Use Scenario: Clamping transient spikes on USB-C PD power delivery lines in head unit power stages. IC Role / Device Role / Timing Role: Overvoltage protector absorbing 40 W non-repetitive surges during hot-plug events. Use Value: Prevents damage to downstream PMICs and SoCs during 100 µs ESD-like transients per ISO 10605. |
| ADAS Camera Module Bias Supply | Electric Power Steering (EPS) Sensor Reference |
Use Scenario: Generating stable 43 V bias for image sensor analog front-end amplifiers in surround-view cameras. IC Role / Device Role / Timing Role: Precision voltage reference stabilizing gain-setting nodes in low-noise amplifier chains. Use Value: Reduces gain drift to <0.02%/°C, preserving dynamic range over −40 °C to +105 °C operating range. |
Use Scenario: Providing calibrated reference for torque sensor Wheatstone bridge excitation in EPS motor control units. IC Role / Device Role / Timing Role: Low-drift Zener source feeding bridge supply rails in closed-loop torque feedback paths. Use Value: Limits torque measurement error to <0.3% FS across full automotive temperature profile and lifetime. |
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-B43,115 (Nexperia) | Same 43 V nominal VZ, but SOD323 package with tighter ±2% tolerance (vs. ±5%); Ptot = 300 mW identical | Preferred where higher initial accuracy required (e.g., calibration references), not needed for general clamping | Select BZX384-B43 if absolute VZ tolerance <±2% is mandated; otherwise SZMM3Z43VT1GX offers cost and supply-chain advantage |
| 1N4747A (ON Semiconductor) | 43 V nominal VZ, but DO-41 through-hole package; Ptot = 1 W; no AEC-Q101 qualification | Suitable only for non-automotive industrial prototypes; incompatible with SMT production and automotive reliability requirements | Use only for bench validation; not recommended for volume automotive designs due to package and qualification mismatch |
Compared with BZX384-B43, SZMM3Z43VT1GX trades ±2% tolerance for broader AEC-Q101-compliant availability and lower unit cost; versus 1N4747A, it provides SMT compatibility, thermal performance matching modern PCBs, and certified automotive reliability - making it the optimal choice for production automotive electronics.
Availability
SZMM3Z43VT1GX is available at Aetrix Electronics and suitable for automotive body control modules, infotainment power protection, and ADAS camera bias supplies requiring stable component supply, long-term lifecycle assurance, and AEC-Q101 compliance.
Supply support for SZMM3Z43VT1GX 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 logic, discrete, and MOSFET solutions, headquartered in Nijmegen, Netherlands.
The SZMM3Z series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for automotive voltage regulation, reference, and transient suppression in space-constrained ECUs.
FAQ
What is the maximum continuous reverse current the SZMM3Z43VT1GX can sustain without degradation?
The device is rated for 200 mA maximum forward current (IF), but as a Zener diode, its continuous reverse current is limited by thermal design. At 25 °C ambient on FR4 PCB, sustained IZ must stay ≤10 mA to maintain Ptot ≤ 300 mW and Tj < 150 °C. Higher currents require derating per Rth(j-a) = 415 K/W.
Does the SZMM3Z43VT1GX support reflow soldering, and what profile is recommended?
Yes - it is qualified for lead-free reflow per J-STD-020. Nexperia specifies a peak temperature of 260 °C max, 30-second duration above 220 °C, and ramp rates ≤3 °C/s. Figure 12 in the datasheet provides the exact SOD323 solder land pattern (0.5 mm pad width, 1.35 mm length) for optimal wetting and void control.
How does the temperature coefficient affect regulation accuracy over automotive temperature ranges?
With SZ = ±0.05 mV/K, VZ drift is bounded to ±1.55 mV/°C. Across −40 °C to +125 °C (ΔT = 165 K), total drift is ≤±8.25 mV - less than 0.02% of 43 V nominal. This ensures regulation remains within ±0.1% of nominal over full automotive operating range.
Can SZMM3Z43VT1GX replace older Zeners like 1N4747A in existing designs?
Only with layout and thermal redesign: SZMM3Z43VT1GX uses SOD323 surface-mount packaging versus DO-41 through-hole, requires different PCB footprints and reflow processes, and has lower Ptot (300 mW vs. 1 W). Electrical equivalence exists, but mechanical and thermal integration must be revalidated per AEC-Q200 guidelines.
SZMM3Z43VT1GX 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):
- 43 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 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
SZMM3Z43VT1GX FAQ
1.How can I place an order for SZMM3Z43VT1GX through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM3Z43VT1GX 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 SZMM3Z43VT1GX reliable?
The price and inventory of SZMM3Z43VT1GX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z43VT1GX is usually 5 days.
3.What payment methods are accepted for SZMM3Z43VT1GX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z43VT1GX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM3Z43VT1GX?
SZMM3Z43VT1GX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM3Z43VT1GX 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 SZMM3Z43VT1GX?
For technical support, including SZMM3Z43VT1GX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z43VT1GX requirements.
6.How does Aetrix verify that SZMM3Z43VT1GX is sourced from the original manufacturer or authorized distributors?
All SZMM3Z43VT1GX 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 SZMM3Z43VT1GX meets industry standards.
7.What is the process for return or replacement of SZMM3Z43VT1GX?
All SZMM3Z43VT1GX units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z43VT1GX, 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 SZMM3Z43VT1GX part is unused and in its original packaging.
Return procedure for SZMM3Z43VT1GX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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