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onsemi SZMMBZ5261BLT1G
- Part No.:
- SZMMBZ5261BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5261BLT1G.pdf
- Description:
- DIODE ZENER 47V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:23,810
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Product details
Overview
SZMMBZ5261BLT1G from onsemi is a 47 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 1000 Ω dynamic impedance at 2.7 mA test current and 0.1 μA reverse leakage at 36 V, used for precision voltage regulation in space-constrained portable electronics.
For engineers reviewing the SZMMBZ5261BLT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (556 °C/W), AEC-Q101 qualification, ESD rating (>16 kV HBM), and SOT-23 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse bias above its specified Zener breakdown voltage of 44.65–49.35 V. It delivers stable regulation under DC or low-frequency transient conditions with minimal temperature drift-typical TC near +0.05 %/°C for this voltage range.
The SOT-23 package features an anode (Pin 1), no-connect (Pin 2), and cathode (Pin 3) configuration, enabling unidirectional clamping and voltage reference functions. Its Pb-free, halogen-free construction meets RoHS and automotive-grade reliability requirements per AEC-Q101.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 44.65 V min / 47 V nominal / 49.35 V max @ IZT = 2.7 mA - defines precise regulation point for feedback or clamp circuits |
| Power Dissipation (PD) | 225 mW on FR-5 board @ 25°C - sets maximum continuous DC power handling before thermal derating begins |
| Zener Impedance (ZZT) | 1000 Ω max @ IZT = 2.7 mA - determines output voltage stability under load variation |
| Reverse Leakage (IR) | 0.1 μA max @ VR = 36 V - ensures minimal standby current in voltage-sense or protection paths |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 board - quantifies junction-to-ambient heat transfer efficiency for thermal design margining |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - supports robustness in handheld and automotive assembly environments |
| AEC-Q101 Qualified | Yes - validates suitability for automotive electronic control units requiring extended temperature and reliability compliance |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, 2.90 mm × 1.30 mm × 1.00 mm body size, void-free thermosetting case with corrosion-resistant finish, cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias regulation; forms input side of Zener clamp path |
| 2 | No Connection | Internally isolated; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress |
| 3 | Cathode | Connected to higher-potential node; provides regulated output reference or clamping node |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-grade qualification | SZ-prefix indicates AEC-Q101 qualification and PPAP capability for engine control, ADAS, and body electronics |
| High ESD immunity | Class 3 (>16 kV HBM) enables direct integration into exposed I/O lines without external protection circuitry |
| Low-leakage regulation | 0.1 μA max reverse leakage at 36 V supports ultra-low-power battery-backed systems and precision sensing |
| Stable Zener voltage tolerance | ±5% over production lot ensures predictable threshold behavior in overvoltage protection and reference divider networks |
| Pb-free and RoHS compliant | Fully compliant with EU RoHS Directive 2011/65/EU and halogen-free/BFR-free requirements for green manufacturing |
Applications
| Automotive Engine Control Unit (ECU) | Portable Medical Sensor Module |
|---|---|
Use Scenario: Regulating reference voltage for analog front-end ADCs monitoring throttle position and oxygen sensor signals. IC Role / Device Role / Timing Role: Two-terminal Zener reference providing stable 47 V rail for high-side biasing and signal conditioning. Use Value: Maintains ±5% regulation accuracy across −40°C to +125°C ambient, ensuring consistent ADC full-scale calibration under thermal cycling. |
Use Scenario: Clamping transient surges on battery-charged ECG electrode interface lines during defibrillation recovery. IC Role / Device Role / Timing Role: Fast-response overvoltage protector limiting input to 49.35 V peak to safeguard downstream op-amps and microcontrollers. Use Value: 1000 Ω Zener impedance minimizes voltage overshoot during 100 ns transients, preserving signal integrity in sub-μV biopotential measurements. |
| Industrial IoT Gateway Power Monitor | 5G Small Cell Baseband Reference |
Use Scenario: Providing stable voltage reference for isolated DC-DC converter feedback loop in DIN-rail mounted edge controllers. IC Role / Device Role / Timing Role: Precision Zener element in optocoupler-coupled secondary-side regulation network. Use Value: Low 0.1 μA leakage prevents error accumulation in high-impedance feedback dividers, enabling ±0.5% output voltage accuracy over 10-year field life. |
Use Scenario: Biasing RF amplifier stages requiring tightly controlled supply rails in compact mmWave radio modules. IC Role / Device Role / Timing Role: Local 47 V stabilization node decoupling sensitive LNA and mixer bias supplies from noisy digital domains. Use Value: SOT-23 footprint allows placement within 2 mm of RF IC pins, reducing parasitic inductance and improving PSRR above 1 GHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C47LT1G | Same 47 V nominal Zener, but 350 mW rating and 600 Ω ZZT @ 5 mA - higher power, lower impedance, non-automotive grade | Lacks AEC-Q101 qualification and >16 kV ESD rating; suitable for industrial/commercial only | Select when higher power margin or lower dynamic impedance is required, and automotive qualification is not mandated |
| SZBZX84C47LT1G | 47 V Zener with AEC-Q101 qualification and 600 Ω ZZT @ 5 mA - same automotive compliance, tighter 5% tolerance, different test current | Higher test current (5 mA vs. 2.7 mA) shifts operating point; requires updated bias resistor calculation | Prefer when matching legacy BZX84 footprint while retaining automotive compliance, accepting revised bias design |
Compared with SZMMBZ5261BLT1G, BZX84-C47LT1G offers higher power and lower impedance but lacks automotive qualification, while SZBZX84C47LT1G matches AEC-Q101 compliance but demands recalibration of bias network due to differing Zener test current.
Availability
SZMMBZ5261BLT1G is available at Aetrix Electronics and suitable for automotive ECUs, portable medical sensors, industrial IoT gateways, and 5G small cell baseband designs requiring stable component supply with AEC-Q101 traceability and RoHS compliance.
Supply support for SZMMBZ5261BLT1G 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMMBZ5261BLT1G belongs to the SZMMBZ52xxBLT1G series of AEC-Q101-qualified Zener diodes engineered specifically for automotive electronics requiring high-reliability voltage regulation in ultra-compact SOT-23 packages.
FAQ
What is the Zener voltage tolerance of SZMMBZ5261BLT1G?
The SZMMBZ5261BLT1G has a Zener voltage tolerance of ±5%, with a nominal value of 47 V and a guaranteed range of 44.65 V to 49.35 V at 2.7 mA test current. This tight tolerance ensures predictable regulation performance in feedback loops and overvoltage protection circuits where threshold accuracy is critical. The SZMMBZ5261BLT1G maintains this specification across its qualified operating temperature range.
Is SZMMBZ5261BLT1G suitable for automotive applications?
Yes, SZMMBZ5261BLT1G is explicitly AEC-Q101 qualified and PPAP capable, with the "SZ" prefix denoting automotive-grade process controls, site-specific change management, and enhanced reliability testing. It operates across −65°C to +150°C junction temperature and meets stringent ESD (Class 3, >16 kV HBM) and environmental requirements for engine control, body electronics, and ADAS subsystems. The SZMMBZ5261BLT1G is designed for these use cases.
What is the maximum power dissipation of SZMMBZ5261BLT1G on standard PCB material?
SZMMBZ5261BLT1G is rated for 225 mW total power dissipation on FR-5 board at 25°C ambient, derating linearly at 1.8 mW/°C above that temperature. This rating assumes standard JEDEC-defined copper pad layout (1.0 × 0.75 × 0.62 in). On alumina substrate, it supports up to 300 mW. Thermal design must account for the 556 °C/W junction-to-ambient resistance to avoid exceeding the 150°C maximum junction temperature. The SZMMBZ5261BLT1G datasheet specifies these limits.
How does the pin configuration of SZMMBZ5261BLT1G differ from standard SOT-23 diodes?
SZMMBZ5261BLT1G uses Style 8 pinout: Pin 1 = Anode, Pin 2 = No Connection (internally unconnected), Pin 3 = Cathode. Unlike dual-anode or dual-cathode variants, this configuration isolates Pin 2 to prevent unintended conduction paths. The cathode band marks Pin 3, and Pin 2 must remain unattached on the PCB. This layout optimizes reverse-bias operation and avoids parasitic coupling in high-density layouts. The SZMMBZ5261BLT1G marking diagram confirms this arrangement.
What is the reverse leakage current specification for SZMMBZ5261BLT1G?
SZMMBZ5261BLT1G specifies a maximum reverse leakage current (IR) of 0.1 μA at VR = 36 V and TA = 25°C. This ultra-low leakage supports precision voltage reference and high-impedance sensing applications where even nanoamp-level currents could introduce measurement error. The value remains stable across the −65°C to +150°C storage range and is verified per AEC-Q101 stress testing. All SZMMBZ5261BLT1G units meet this spec.
SZMMBZ5261BLT1G 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):
- 47 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 105 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 36 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)
SZMMBZ5261BLT1G FAQ
1.How can I place an order for SZMMBZ5261BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5261BLT1G 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 SZMMBZ5261BLT1G reliable?
The price and inventory of SZMMBZ5261BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5261BLT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5261BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5261BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5261BLT1G?
SZMMBZ5261BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5261BLT1G 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 SZMMBZ5261BLT1G?
For technical support, including SZMMBZ5261BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5261BLT1G requirements.
6.How does Aetrix verify that SZMMBZ5261BLT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5261BLT1G 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 SZMMBZ5261BLT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5261BLT1G?
All SZMMBZ5261BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5261BLT1G, 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 SZMMBZ5261BLT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5261BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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