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onsemi SZMM3Z51VT1G
- Part No.:
- SZMM3Z51VT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SZMM3Z51VT1G.pdf
- Description:
- DIODE ZENER 51V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:4,755
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Product details
Overview
SZMM3Z51VT1G from onsemi is a 51 V, 300 mW Zener voltage regulator diode in SOD−323 package, designed for precision voltage reference and overvoltage protection in space-constrained PCBs. It delivers ±5% nominal Zener voltage tolerance at 2 mA test current, features 180 Ω maximum dynamic impedance at IZT, and supports automotive-grade reliability with AEC−Q101 qualification.
For engineers reviewing the SZMM3Z51VT1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 51 V regulation accuracy, low 40 pF capacitance at 0 V bias, −2.7 mV/°C temperature coefficient, ESD robustness (>16 kV HBM), and suitability for portable power rail clamping and reference buffering.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across load variations and supply fluctuations. Its 300 mW steady-state power rating and 416 °C/W junction-to-ambient thermal resistance define safe operating limits on FR−4 boards with 1 cm² copper pad.
The device exhibits 0.05 μA maximum leakage current at 35.7 V reverse voltage and 57.2 V maximum Zener voltage at rated current, enabling precise clamping in 48 V system interfaces. Its −2.7 mV/°C temperature coefficient ensures predictable drift across −65 °C to +150 °C junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 48 V min / 51 V nom / 54 V max @ IZT = 2 mA - defines clamping threshold for 48 V rail protection |
| Power Dissipation | 300 mW @ TA = 25°C - sets maximum continuous energy handling on standard PCB |
| Zener Impedance | 180 Ω max @ IZT = 2 mA - determines regulation stiffness under dynamic load transients |
| Leakage Current | 0.05 μA max @ VR = 35.7 V - ensures minimal standby power loss in high-impedance bias networks |
| Capacitance | 40 pF @ VR = 0 V, f = 1 MHz - enables use in moderate-speed signal line protection without excessive filtering |
| Temperature Coefficient | −2.7 mV/°C - quantifies voltage drift per degree, critical for temperature-stable references |
| ESD Rating | Class 3 (>16 kV) HBM - provides robustness against handling and system-level electrostatic discharge |
Pinout & Package
SZMM3Z51VT1G is housed in a Pb-free SOD−323 surface-mount plastic package (Case 477, Style 1), measuring 1.7 mm × 1.25 mm × 0.9 mm with cathode polarity indicated by a band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-biased during Zener operation |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential reference; completes conduction path |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 qualified | Validated for automotive electronics including infotainment power rails and body control modules |
| Low-profile SOD−323 package | Enables placement in <1.0 mm board height constraints typical of smartphones and wearables |
| 16 kV HBM ESD rating | Eliminates need for external ESD protection in USB, audio jack, and sensor interface circuits |
| −65 °C to +150 °C operating range | Supports under-hood automotive applications and industrial edge nodes without derating |
| Pb-free and RoHS compliant | Meets global environmental compliance requirements for consumer and medical devices |
Applications
| 48 V Telecom Power Clamping | Automotive Body Control Module Reference |
|---|---|
Use Scenario: Protecting 48 V DC-DC converter feedback nodes from transient overvoltage events in telecom base stations. IC Role / Device Role / Timing Role: Zener clamp providing fast-acting voltage limiting to safeguard error amplifier inputs. Use Value: Maintains regulation within ±5% at 2 mA while absorbing up to 300 mW surge energy without latch-up. |
Use Scenario: Generating stable 51 V reference for microcontroller ADC calibration in vehicle lighting control units. IC Role / Device Role / Timing Role: Precision voltage reference source with low tempco for analog subsystem calibration. Use Value: Delivers −2.7 mV/°C drift and 0.05 μA leakage, enabling <0.1% full-scale error over −40 °C to +125 °C. |
| Portable Medical Device Battery Monitoring | Industrial IoT Sensor Signal Conditioning |
Use Scenario: Clamping battery voltage sense lines in handheld ultrasound scanners powered by Li-ion packs. IC Role / Device Role / Timing Role: Overvoltage protector for high-impedance voltage divider networks feeding battery fuel gauges. Use Value: 40 pF capacitance avoids signal distortion at kHz-level sampling rates; 1.7 mm × 1.25 mm footprint saves board area. |
Use Scenario: Stabilizing excitation voltage for strain gauge bridges in factory-floor vibration sensors. IC Role / Device Role / Timing Role: Low-noise voltage reference supplying bridge bias with minimal thermal drift. Use Value: 180 Ω Zener impedance ensures <10 mV ripple under 100 μA load variation, improving measurement resolution. |
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 | 51 V, 300 mW, SOD-323, but ±5% tolerance only at IZT = 5 mA; higher 200 Ω ZZT; no AEC-Q101 rating | Limited to commercial-grade portable electronics; not suitable for automotive BOMs requiring PPAP | Select when cost sensitivity outweighs automotive qualification and tighter low-current regulation |
| MMSZ5256B-TP | 51 V, 500 mW, SOD-123; larger 3.7 mm × 1.6 mm footprint; 100 Ω ZZT @ 20 mA; no specified ESD rating | Better power handling but incompatible with ultra-dense layouts; requires PCB redesign | Choose when higher surge energy absorption is needed and board space allows SOD-123 placement |
Compared with BZX384-B51,115 and MMSZ5256B-TP, SZMM3Z51VT1G uniquely combines AEC−Q101 qualification, 40 pF low capacitance, and SOD−323 miniaturization-making it the only option for automotive 48 V reference designs where space, reliability, and ESD immunity are jointly constrained.
Availability
SZMM3Z51VT1G is available at Aetrix Electronics and suitable for automotive body control modules, 48 V telecom power systems, and portable medical device battery monitoring requiring stable component supply and long-term lifecycle support.
Supply support for SZMM3Z51VT1G 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
onsemi (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMM3Z51VT1G belongs to the MM3ZxxxT1G/SZMM3ZxxxT1G series-engineered specifically for compact, high-reliability voltage regulation in automotive and portable electronics where board space and AEC−Q101 compliance are mandatory.
FAQ
What is the Zener voltage tolerance of SZMM3Z51VT1G at 2 mA test current?
The SZMM3Z51VT1G has a Zener voltage range of 48 V (minimum) to 54 V (maximum) at IZT = 2 mA, yielding a nominal 51 V with ±5.9% total tolerance. This specification is measured per the datasheet's electrical characteristics table and applies under TA = 25°C conditions with pulse testing to avoid self-heating effects.
Is SZMM3Z51VT1G suitable for automotive applications?
Yes, SZMM3Z51VT1G is AEC−Q101 qualified and PPAP capable, with the "SZ" prefix explicitly denoting automotive-grade manufacturing controls. It meets stringent requirements for temperature cycling, humidity resistance, and ESD robustness required in body control modules, ADAS power supplies, and infotainment systems.
What is the maximum power dissipation for SZMM3Z51VT1G on a standard FR-4 PCB?
SZMM3Z51VT1G has a steady-state power rating of 300 mW at TA = 25°C on an FR-4 board with a 1 cm² copper pad. Derating is linear at 2.4 mW/°C above 25°C, reaching zero dissipation at approximately 150°C ambient-consistent with its −65 °C to +150 °C junction temperature range.
How does the temperature coefficient affect SZMM3Z51VT1G's performance in wide-temperature environments?
SZMM3Z51VT1G has a temperature coefficient of −2.7 mV/°C, meaning its Zener voltage decreases by 2.7 mV per degree Celsius rise. Over a −40 °C to +125 °C range, this results in ~447 mV total drift-critical for precision references but acceptable for clamping where absolute accuracy is secondary to threshold consistency.
What packaging and orientation information is provided for SZMM3Z51VT1G tape-and-reel delivery?
SZMM3Z51VT1G ships in Pb-free SOD−323 packages on 3,000-unit tape-and-reel per the ordering information. The cathode is marked with a band at Pin 1; orientation follows standard SOD−323 carrier tape configuration per ON Semiconductor's BRD8011/D specification, with devices placed cavity-up and banded end leading.
SZMM3Z51VT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±6%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 500 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
SZMM3Z51VT1G FAQ
1.How can I place an order for SZMM3Z51VT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM3Z51VT1G 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 SZMM3Z51VT1G reliable?
The price and inventory of SZMM3Z51VT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z51VT1G is usually 5 days.
3.What payment methods are accepted for SZMM3Z51VT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z51VT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM3Z51VT1G?
SZMM3Z51VT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM3Z51VT1G 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 SZMM3Z51VT1G?
For technical support, including SZMM3Z51VT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z51VT1G requirements.
6.How does Aetrix verify that SZMM3Z51VT1G is sourced from the original manufacturer or authorized distributors?
All SZMM3Z51VT1G 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 SZMM3Z51VT1G meets industry standards.
7.What is the process for return or replacement of SZMM3Z51VT1G?
All SZMM3Z51VT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z51VT1G, 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 SZMM3Z51VT1G part is unused and in its original packaging.
Return procedure for SZMM3Z51VT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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