My Inquiry
My Account
Nexperia USA Inc. SZMM5Z18VT5GF
.jpg)
- Part No.:
- SZMM5Z18VT5GF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
SZMM5Z18VT5GF.pdf
- Description:
- DIODE ZENER 18V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:18,819
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SZMM5Z18VT5GF from Nexperia is a Zener voltage regulator diode in SOD523 (SC-79) package, designed for precision voltage reference and overvoltage protection in low-power circuits. It delivers a nominal 18 V Zener voltage (17.64–18.36 V at IZ = 5 mA), ±2 % tolerance, 12.6 Ω differential resistance, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SZMM5Z18VT5GF datasheet, SZMM5Z18VT5GF pinout, SZMM5Z18VT5GF application, or SZMM5Z18VT5GF equivalent, key selection criteria include Zener voltage accuracy, low rdiff, thermal stability (SZ = +12.4 to +16.0 mV/K), surge capability (40 W non-repetitive peak reverse power), and ultra-small SMD footprint for space-constrained PCBs.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining stable output voltage across its cathode-anode terminals when reverse-biased above its breakdown threshold. Its 18 V nominal Zener voltage is specified at IZ = 5 mA with tight 2 % tolerance and low 12.6 Ω dynamic impedance, enabling accurate regulation under varying load conditions.
The diode exhibits a positive temperature coefficient (+12.4 to +16.0 mV/K) and supports operation from −55 °C to +150 °C junction temperature. It is rated for 300 mW total power dissipation on FR4 PCB with 35 mm² copper area and withstands 40 W non-repetitive surges (tp = 100 µs, square wave).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 17.64–18.36 V at IZ = 5 mA - defines precise regulation point for 18 V rail stabilization |
| Tolerance | ±2 % - ensures consistent voltage reference across production lots without calibration |
| Differential Resistance rdiff | 12.6 Ω - minimizes output voltage shift under load current variation |
| Temperature Coefficient SZ | +12.4 to +16.0 mV/K - enables predictable drift compensation in thermal-aware designs |
| Non-repetitive Peak Power PZSM | 40 W (tp = 100 µs) - provides transient overvoltage clamping for ESD/surge events |
| Total Power Dissipation Ptot | 300 mW at Tamb = 25 °C - sets continuous DC power limit for thermal design on standard FR4 |
| Junction Temperature Tj | −55 to +150 °C - supports operation in under-hood automotive and industrial environments |
Pinout & Package
Package: SOD523 (SC-79), ultra-small surface-mount plastic package with flat leads; dimensions: 1.25 × 0.85 × 0.65 mm (L × W × H); cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; marking bar identifies this terminal; carries reverse current during regulation |
| 2 (A) | Anode | Connected to ground or lower-potential reference; completes reverse-bias path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics |
| ±2 % Zener voltage tolerance | Reduces need for post-assembly trimming and improves BOM consistency in high-volume production |
| Low 12.6 Ω differential resistance | Stabilizes output voltage against load transients up to ±10 mA change without external compensation |
| 40 W non-repetitive surge rating | Clamps fast transients (e.g., ISO 7637-2 pulse 1/2a) without failure in 12 V vehicle systems |
| SOD523 ultra-compact footprint | Enables placement in dense layouts near IC power pins for localized decoupling and regulation |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating reference voltage for microcontroller ADC inputs in door module ECUs. IC Role / Device Role / Timing Role: Shunt Zener reference providing stable 18 V bias to op-amp front-end and ADC reference divider. Use Value: Maintains <±0.36 V regulation error across temperature and supply ripple, ensuring <12-bit ADC linearity. |
Use Scenario: Stabilizing excitation voltage for 4–20 mA loop-powered pressure transmitters. IC Role / Device Role / Timing Role: Precision shunt regulator establishing fixed 18 V rail for sensor bridge and signal chain. Use Value: Delivers <0.5 % full-scale error contribution due to voltage drift, meeting SIL-2 functional safety margin. |
| Consumer USB-C Power Delivery Monitor | Medical Portable Diagnostic Device |
Use Scenario: Clamping and regulating auxiliary 18 V rail in PD controller companion circuitry. IC Role / Device Role / Timing Role: Overvoltage protector and reference source for voltage supervisor ICs monitoring PD negotiation status. Use Value: Absorbs 40 W surge energy from hot-plug transients while holding regulation within 18.0 ±0.36 V window. |
Use Scenario: Providing isolated 18 V reference for analog front-end in battery-powered ECG amplifier. IC Role / Device Role / Timing Role: Low-noise Zener reference stabilizing gain-setting resistors and filter cutoffs. Use Value: Contributes <0.8 µV/°C thermal drift to total system offset, supporting <5 µV baseline stability requirement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C18LT1G | Same 18 V nominal, ±2 %, but higher rdiff (20 Ω) and no AEC-Q101 qualification | Rated only for commercial temperature range (−65 to +150 °C storage, but not automotive-qualified) | Select when cost sensitivity outweighs automotive compliance and tighter regulation is not required |
| MMSZ5245B-TP | 18 V nominal, ±5 % tolerance, 300 mW rating, SOD-123 package (larger than SOD523) | Larger footprint increases board area use; wider tolerance requires downstream calibration | Choose for legacy designs using SOD-123 footprints or where ±5 % regulation is acceptable |
Compared with BZX584C18LT1G and MMSZ5245B-TP, SZMM5Z18VT5GF offers superior regulation accuracy (±2 % vs ±5 %), lower dynamic impedance (12.6 Ω vs 20 Ω), and automotive qualification-making it optimal for space-constrained, high-reliability 18 V reference and clamp functions.
Availability
SZMM5Z18VT5GF is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, USB-C power delivery monitors, and portable medical diagnostics requiring stable component supply and AEC-Q101 assurance.
Supply support for SZMM5Z18VT5GF 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 with focus on efficiency, miniaturization, and automotive-grade quality.
SZMM5Z series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for precision voltage reference and transient suppression in space-constrained automotive and industrial control systems.
FAQ
What is the maximum continuous reverse current the SZMM5Z18VT5GF can sustain at 25 °C ambient?
At Tamb = 25 °C on an FR4 PCB with ~35 mm² copper at the cathode tab, the device sustains up to 16.7 mA continuous reverse current (300 mW ÷ 18 V), limited by its 300 mW total power dissipation rating and thermal resistance of 350 K/W.
How does the temperature coefficient affect regulation accuracy over −40 °C to +125 °C?
With a specified SZ of +12.4 to +16.0 mV/K, the Zener voltage shifts approximately +1.86 V to +2.4 V across a 150 K range (e.g., −55 °C to +95 °C), resulting in a worst-case deviation of ±1.2 % from nominal 18 V-within typical system tolerance budgets for non-critical references.
Can SZMM5Z18VT5GF replace older Zeners like 1N4744A in new designs?
No-it cannot serve as a direct replacement due to different package (SOD523 vs DO-41), lower power rating (300 mW vs 1 W), and distinct thermal behavior. While both regulate at ~18 V, the SZMM5Z18VT5GF requires PCB layout optimization for thermal management and is intended for modern compact SMT applications, not through-hole retrofits.
Is the 40 W surge rating applicable to repetitive pulses?
No-the 40 W non-repetitive peak reverse power dissipation applies only to single, isolated pulses (tp = 100 µs, square wave, Tj = 25 °C before surge). Repetitive surges must be evaluated using thermal time constants and average power limits; sustained repetition risks junction overheating beyond 150 °C.
SZMM5Z18VT5GF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 12.6 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-523
SZMM5Z18VT5GF FAQ
1.How can I place an order for SZMM5Z18VT5GF through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM5Z18VT5GF 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 SZMM5Z18VT5GF reliable?
The price and inventory of SZMM5Z18VT5GF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM5Z18VT5GF is usually 5 days.
3.What payment methods are accepted for SZMM5Z18VT5GF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM5Z18VT5GF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM5Z18VT5GF?
SZMM5Z18VT5GF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM5Z18VT5GF 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 SZMM5Z18VT5GF?
For technical support, including SZMM5Z18VT5GF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM5Z18VT5GF requirements.
6.How does Aetrix verify that SZMM5Z18VT5GF is sourced from the original manufacturer or authorized distributors?
All SZMM5Z18VT5GF 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 SZMM5Z18VT5GF meets industry standards.
7.What is the process for return or replacement of SZMM5Z18VT5GF?
All SZMM5Z18VT5GF units undergo pre-shipment inspection (PSI). If there is an issue with SZMM5Z18VT5GF, 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 SZMM5Z18VT5GF part is unused and in its original packaging.
Return procedure for SZMM5Z18VT5GF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMM5Z18VT5GF Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
