My Inquiry
My Account
onsemi SZMMBZ5254BLT1G
- Part No.:
- SZMMBZ5254BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5254BLT1G.pdf
- Description:
- DIODE ZENER 27V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,709
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SZMMBZ5254BLT1G from onsemi is a 27 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 4.6 mA test current, 41 Ω dynamic impedance at IZT, and 0.1 μA leakage at 21 V reverse bias-used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the SZMMBZ5254BLT1G 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 in space-constrained designs.
Technical Context
This device operates as a two-terminal voltage reference diode with cathode-anode polarity, designed for stable reverse-bias regulation under DC or low-frequency transient conditions. Its 27 V nominal Zener voltage exhibits a positive temperature coefficient near zero crossing, minimizing drift across −65°C to +150°C operating range.
The SOT-23 package features a no-connect (NC) terminal (Pin 2), enabling mechanical stability without electrical function-critical for automated placement yield. Thermal performance is specified for both FR-5 PCB (225 mW) and alumina substrate (300 mW), supporting design flexibility in thermal management strategies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 25.65 V min / 27 V nom / 28.35 V max @ IZT = 4.6 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 225 mW on FR-5 board @ 25°C - sets maximum continuous power handling before thermal derating begins |
| Zener Impedance (ZZT) | 41 Ω @ IZT = 4.6 mA - determines AC regulation accuracy and ripple rejection capability |
| Leakage Current (IR) | 0.1 μA @ VR = 21 V - ensures minimal standby current draw in undervoltage detection circuits |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - guarantees robustness against handling and board-level ESD events |
| Operating Temperature | −65°C to +150°C - supports automotive under-hood and industrial high-temperature environments |
| AEC-Q101 Qualified | Yes - validates reliability for automotive electronics applications requiring PPAP documentation |
Pinout & Package
SOT-23 (TO-236) package: 2.90 mm × 1.30 mm × 1.00 mm body, 1.90 mm lead pitch, void-free thermosetting plastic case with corrosion-resistant finish and UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; carries forward current during fault conditions |
| 2 | No Connection | Mechanical support only-no internal bond wire; must remain unconnected in PCB layout |
| 3 | Cathode | Connected to higher-potential node; defines regulated voltage reference point at cathode-to-anode potential |
Key Features
| Feature | Design Value |
|---|---|
| Pb-Free, Halogen-Free/BFR-Free | RoHS-compliant construction enables use in environmentally regulated consumer and automotive supply chains |
| Automated Assembly Optimized | Standard SOT-23 footprint and marking alignment ensure high-yield pick-and-place and reflow soldering |
| High-Density Packaging | Small 2.90 × 1.30 mm outline allows placement in tight spaces such as smartphone PMIC rails and wearables |
| Stable Zener Voltage Tolerance | ±5% tolerance band (25.65–28.35 V) supports accurate threshold setting without post-production trimming |
| Low-Leakage Regulation | 0.1 μA max IR at 21 V enables reliable undervoltage lockout (UVLO) and brownout detection functions |
Applications
| Portable Power Monitoring | Automotive ECU Reference |
|---|---|
|
Use Scenario: Voltage supervision circuit in Bluetooth headset battery management IC detects overvoltage during fast charging. IC Role / Device Role / Timing Role: Zener reference element providing stable 27 V clamp to protect LDO input stage from >30 V transients. Use Value: Prevents permanent damage to downstream regulators by clamping surge energy within 225 mW thermal limit of SOT-23 package. |
Use Scenario: Reference node for analog-to-digital converter measuring 12 V rail voltage in engine control unit. IC Role / Device Role / Timing Role: Precision voltage reference source ensuring ADC code accuracy across temperature extremes. Use Value: Maintains <±1% full-scale error over −40°C to +125°C due to AEC-Q101 validated Zener TC and leakage stability. |
| Industrial Sensor Interface | USB-C PD Protection |
|
Use Scenario: Overvoltage guard on 24 V fieldbus interface of PLC I/O module exposed to inductive kickback. IC Role / Device Role / Timing Role: Transient voltage suppressor absorbing short-duration spikes while maintaining steady-state regulation. Use Value: Limits peak voltage to ≤28.35 V with 41 Ω dynamic impedance, reducing stress on op-amp input stages. |
Use Scenario: Input clamp on USB-C power delivery controller monitoring VBUS up to 20 V during negotiation. IC Role / Device Role / Timing Role: Secondary overvoltage limiter backing up primary TVS diode during sustained overvoltage events. Use Value: Provides precise 27 V regulation margin above 20 V VBUS max, preventing false trigger of shutdown logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C27LT1G | Same 27 V nominal Zener, but rated for 300 mW on FR-4 and lacks AEC-Q101 qualification | Not suitable for automotive production; acceptable for commercial-grade portable devices | Select when cost sensitivity outweighs automotive compliance requirements |
| SZBZX84C27LT1G | 27 V Zener with AEC-Q101 qualification and identical SOT-23 package, but 300 mW rating and 50 Ω ZZT | Higher power headroom and same automotive qualification, but slightly degraded regulation accuracy | Prefer when thermal margin is critical and ±5% VZ tolerance remains acceptable |
Compared with BZX84-C27LT1G and SZBZX84C27LT1G, SZMMBZ5254BLT1G offers tighter Zener impedance (41 Ω vs. ≥50 Ω) and guaranteed automotive qualification at 225 mW-making it optimal for space-constrained, thermally limited automotive sensor nodes where regulation precision is prioritized over absolute power handling.
Availability
SZMMBZ5254BLT1G is available at Aetrix Electronics and suitable for automotive ECUs, portable medical monitors, industrial IoT sensors, and USB-C accessory power management requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZMMBZ5254BLT1G 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.
The MMBZ52xxBLT1G/SZMMBZ52xxBLT1G series was developed specifically for compact, high-reliability voltage regulation in surface-mount applications-emphasizing AEC-Q101 compliance, low-profile packaging, and consistent Zener performance across temperature and production lots.
FAQ
What is the Zener voltage tolerance of SZMMBZ5254BLT1G?
The SZMMBZ5254BLT1G has a Zener voltage tolerance of ±5% around its nominal 27 V value, resulting in a guaranteed range of 25.65 V to 28.35 V at 4.6 mA test current. This tolerance is fully specified and tested per onsemi's production screening, and applies across the full −65°C to +150°C operating temperature range for the SZMMBZ5254BLT1G.
Is SZMMBZ5254BLT1G qualified for automotive applications?
Yes, SZMMBZ5254BLT1G is AEC-Q101 qualified and PPAP capable, with full documentation available for automotive production release. The "SZ" prefix explicitly denotes automotive-grade manufacturing controls, site-specific change management, and extended reliability testing beyond standard commercial parts-making SZMMBZ5254BLT1G suitable for engine control units, ADAS modules, and infotainment systems.
What is the meaning of Pin 2 being labeled "No Connection" in SZMMBZ5254BLT1G?
Pin 2 of the SZMMBZ5254BLT1G is an unconnected mechanical tie-bar inside the SOT-23 package-present solely to enhance leadframe rigidity and placement accuracy during automated assembly. It must remain floating in the PCB layout; connecting it risks mechanical stress or unintended parasitic coupling. This NC terminal is confirmed in the official onsemi mechanical drawing CASE 318 STYLE 8 for SZMMBZ5254BLT1G.
How does the thermal resistance of SZMMBZ5254BLT1G affect its power handling?
SZMMBZ5254BLT1G has a junction-to-ambient thermal resistance of 556 °C/W on FR-5 board, meaning each 1°C rise above ambient requires dissipating 1.8 mW less than the 225 mW rated power. At 85°C ambient, its usable power drops to ~115 mW-so thermal design must account for this derating curve to avoid exceeding 150°C maximum junction temperature in the SZMMBZ5254BLT1G.
Can SZMMBZ5254BLT1G replace MMBZ5254BLT1G in existing designs?
Yes, SZMMBZ5254BLT1G is a direct functional replacement for MMBZ5254BLT1G with identical electrical specifications, pinout, and package dimensions. The only differences are enhanced process controls, AEC-Q101 qualification, and automotive PPAP support-so no PCB or schematic changes are needed when upgrading to SZMMBZ5254BLT1G in new or legacy automotive designs.
SZMMBZ5254BLT1G 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):
- 27 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 41 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 21 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)
SZMMBZ5254BLT1G FAQ
1.How can I place an order for SZMMBZ5254BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5254BLT1G 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 SZMMBZ5254BLT1G reliable?
The price and inventory of SZMMBZ5254BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5254BLT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5254BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5254BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5254BLT1G?
SZMMBZ5254BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5254BLT1G 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 SZMMBZ5254BLT1G?
For technical support, including SZMMBZ5254BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5254BLT1G requirements.
6.How does Aetrix verify that SZMMBZ5254BLT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5254BLT1G 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 SZMMBZ5254BLT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5254BLT1G?
All SZMMBZ5254BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5254BLT1G, 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 SZMMBZ5254BLT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5254BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMBZ5254BLT1G 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
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
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…
