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onsemi SZMMBZ5221BLT1G
- Part No.:
- SZMMBZ5221BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5221BLT1G.pdf
- Description:
- DIODE ZENER 2.4V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,376
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Product details
Overview
SZMMBZ5221BLT1G from onsemi is a 2.4 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board at 25°C, with 1200 Ω dynamic impedance at 20 mA test current and 0.25 μA leakage at 1 V reverse bias - used for precision voltage reference and overvoltage protection in compact portable power rails.
For engineers reviewing the SZMMBZ5221BLT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (556 °C/W), ESD rating (>16 kV HBM), AEC-Q101 qualification, and SOT-23 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal voltage reference diode with cathode-anode polarity, designed for stable reverse-biased regulation under low-current conditions (IZT = 20 mA). Its nominal 2.4 V Zener voltage exhibits a negative temperature coefficient near this range, requiring thermal derating above 25°C per 1.8 mW/°C.
The SOT-23 package features Pin 1 (Anode), Pin 2 (No Connection), and Pin 3 (Cathode), with void-free thermoset plastic construction, UL 94 V-0 flammability rating, and Pb-free/RoHS-compliant finish. It supports automated placement and reflow soldering up to 260°C for 10 seconds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.4 V nominal, min 2.28 V / max 2.52 V @ IZT = 20 mA - defines regulated output voltage tolerance band for reference stability |
| Power Dissipation (PD) | 225 mW on FR-5 board @ 25°C, derated 1.8 mW/°C - sets maximum continuous power handling before thermal shutdown risk |
| Zener Impedance (ZZT) | 1200 Ω max @ IZT = 20 mA - indicates voltage regulation stiffness; lower values improve load regulation |
| Leakage Current (IR) | 0.25 μA max @ VR = 1 V - ensures minimal standby current draw in low-power sleep modes |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - enables robust handling in manual assembly and field-repair environments |
| Junction Temp Range | −65°C to +150°C - supports operation in automotive under-hood and industrial ambient extremes |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 mm × 1.30 mm × 1.00 mm body size, with cathode indicated by polarity band. Void-free thermoset plastic case, corrosion-resistant finish, UL 94 V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential side of regulated rail; reverse-biased during Zener operation |
| 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| 3 | Cathode | Connected to higher-potential side; polarity band identifies this terminal for correct orientation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive-grade reliability including temperature cycling, HTOL, and ESD stress - suitable for ADAS and infotainment power rails |
| Pb-Free / RoHS Compliant | Fully compliant with EU RoHS Directive 2011/65/EU and halogen-free/BFR-free requirements - meets global environmental compliance mandates |
| Small Outline Package | SOT-23 footprint enables <1.0 mm² board area usage - critical for space-constrained wearable and IoT sensor nodes |
| High ESD Robustness | 16 kV HBM rating eliminates need for external TVS in many portable designs - reduces BOM count and layout complexity |
Applications
| Smartphone Power Management | Automotive Cabin Controller |
|---|---|
Use Scenario: Providing stable 2.4 V reference for ADC biasing and LDO feedback networks in battery-powered mobile SoC subsystems. IC Role / Device Role: Precision voltage reference and overvoltage clamp protecting analog front-end inputs. Use Value: Maintains ±5% regulation across −40°C to +85°C ambient while occupying <1 mm² PCB area. |
Use Scenario: Regulating supply to microcontroller reset circuitry and CAN transceiver bias rails in HVAC control modules. IC Role / Device Role: Zener shunt regulator ensuring clean 2.4 V logic-level signaling under load dump transients. Use Value: AEC-Q101 qualification guarantees operation at 125°C junction temperature with >16 kV ESD immunity. |
| Industrial Sensor Node | Medical Wearable Monitor |
Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors in factory automation transmitters. IC Role / Device Role: Low-drift voltage reference source with minimal self-heating impact on measurement accuracy. Use Value: 0.25 μA leakage at 1 V ensures <10 nW standby power consumption in energy-harvesting designs. |
Use Scenario: Clamping ECG electrode input protection circuits and regulating op-amp bias in ultra-low-power biosignal acquisition. IC Role / Device Role: Overvoltage protector and reference generator co-located at analog signal chain input stage. Use Value: SOT-23 size allows integration directly at connector interface without routing parasitic inductance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C2V4LT1G | Same 2.4 V nominal Zener, but 350 mW rating and 600 Ω ZZT; not AEC-Q101 qualified | Lacks automotive qualification and has higher power dissipation - better suited for non-automotive industrial use | Select when higher power margin or lower impedance is needed and AEC-Q101 is not required |
| SZBZX84C2V4LT1G | AEC-Q101 qualified, same 2.4 V rating, but 350 mW PD and 600 Ω ZZT; larger thermal resistance (429 °C/W) | Higher power capability but less precise regulation due to wider Zener tolerance (±6%) vs. SZMMBZ5221BLT1G's ±5% | Choose for automotive systems needing higher surge tolerance where tighter voltage tolerance is secondary |
Compared with BZX84-C2V4LT1G and SZBZX84C2V4LT1G, SZMMBZ5221BLT1G offers tighter voltage tolerance (±5%), lower leakage (0.25 μA), and optimized thermal performance for space-constrained automotive and portable designs - though at reduced power rating.
Availability
SZMMBZ5221BLT1G is available at Aetrix Electronics and suitable for smartphone power management, automotive cabin controllers, industrial sensor nodes, and medical wearable monitors requiring stable component supply with automotive-grade reliability and compact footprint.
Supply support for SZMMBZ5221BLT1G 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 is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications - focused on enabling sustainable electronics innovation.
SZMMBZ5221BLT1G belongs to the SZMMBZ52xxBLT1G series of AEC-Q101-qualified Zener diodes designed specifically for automotive and high-reliability industrial voltage regulation where space, ESD robustness, and thermal stability are critical.
FAQ
What is the Zener voltage tolerance of SZMMBZ5221BLT1G?
The SZMMBZ5221BLT1G has a Zener voltage tolerance of ±5% around its nominal 2.4 V rating, meaning the actual measured VZ falls between 2.28 V and 2.52 V at IZT = 20 mA and TA = 25°C. This tight tolerance supports precision reference applications where voltage drift must be minimized across operating conditions.
Is SZMMBZ5221BLT1G qualified for automotive applications?
Yes, SZMMBZ5221BLT1G is AEC-Q101 qualified and PPAP capable, with full documentation supporting its use in automotive electronics. Its construction, testing, and traceability meet automotive quality system requirements - making it suitable for cabin controllers, body electronics, and ADAS subsystems where reliability under thermal and electrical stress is mandatory.
What is the maximum power dissipation for SZMMBZ5221BLT1G on standard PCB material?
SZMMBZ5221BLT1G is rated for 225 mW total power dissipation on FR-5 board at 25°C ambient, with linear derating of 1.8 mW/°C above that temperature. On alumina substrate, it supports up to 300 mW at 25°C. These ratings assume proper copper pour and thermal relief design per onsemi's layout guidelines.
Does SZMMBZ5221BLT1G have a no-connect pin, and how should it be handled on PCB?
Yes, SZMMBZ5221BLT1G uses Pin 2 as a no-connect terminal - it is internally unconnected and must remain electrically floating on the PCB. No trace, pad, or thermal connection should be made to Pin 2; doing so may compromise device reliability or cause unintended coupling paths in sensitive analog circuits.
What is the ESD rating of SZMMBZ5221BLT1G, and which model does it follow?
SZMMBZ5221BLT1G has an ESD rating of Class 3 per the Human Body Model (HBM), exceeding 16 kV. This rating is verified per ANSI/ESDA/JEDEC JS-001 and confirms robustness against common handling and system-level electrostatic events - eliminating the need for additional discrete ESD protection in many portable and automotive interfaces.
SZMMBZ5221BLT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 2.4 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 100 µA @ 1 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:
- SOT-23-3 (TO-236)
SZMMBZ5221BLT1G FAQ
1.How can I place an order for SZMMBZ5221BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5221BLT1G 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 SZMMBZ5221BLT1G reliable?
The price and inventory of SZMMBZ5221BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5221BLT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5221BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5221BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5221BLT1G?
SZMMBZ5221BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5221BLT1G 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 SZMMBZ5221BLT1G?
For technical support, including SZMMBZ5221BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5221BLT1G requirements.
6.How does Aetrix verify that SZMMBZ5221BLT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5221BLT1G 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 SZMMBZ5221BLT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5221BLT1G?
All SZMMBZ5221BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5221BLT1G, 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 SZMMBZ5221BLT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5221BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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