My Inquiry
My Account
onsemi SZMMBZ5245ELT1G
- Part No.:
- SZMMBZ5245ELT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5245ELT1G.pdf
- Description:
- DIODE ZENER 15V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,458
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SZMMBZ5245ELT1G from onsemi is a 15 V, 225 mW surface-mount Zener diode in SOT-23 package, designed for precision voltage regulation and overvoltage protection in space-constrained circuits. It delivers ±5% nominal Zener voltage tolerance at 8.5 mA test current, exhibits 16 Ω dynamic impedance at IZT, and supports ≤0.1 µA reverse leakage at 11 V, making it suitable for low-power biasing and reference applications in portable electronics.
For engineers reviewing the SZMMBZ5245ELT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy (14.25–15.75 V), thermal resistance (556 °C/W on FR-5), AEC-Q101 qualification, ESD robustness (>16 kV HBM), and SOT-23 footprint compatibility with automated assembly.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its 15 V nominal Zener voltage places it in the medium-voltage range where temperature coefficient is near zero (≈+2 mV/°C per datasheet Figure 1), minimizing drift across −55°C to +150°C operating range.
The SOT-23 package features Pin 1 (Anode), Pin 2 (No Connection), and Pin 3 (Cathode), with cathode polarity marked by a band. Thermal performance is specified for FR-5 board (225 mW derated at 1.8 mW/°C above 25°C) and alumina substrate (300 mW derated at 2.4 mW/°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 14.25–15.75 V @ IZT = 8.5 mA - defines stable regulation window for reference or clamp operation |
| Power Dissipation (PD) | 225 mW on FR-5 board @ TA = 25°C - sets maximum continuous DC power handling in standard PCB layout |
| Zener Impedance (ZZT) | 16 Ω @ IZT = 8.5 mA - determines output voltage stability under load variation |
| Reverse Leakage (IR) | ≤0.1 µA @ VR = 11 V - ensures minimal quiescent current in standby or high-impedance sensing nodes |
| ESD Rating | Class 3 (>16 kV) per HBM - enables robust handling during automated SMT assembly and field operation |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 - quantifies junction-to-ambient heat rise under full power, critical for thermal design margin |
| Junction Temp Range | −65°C to +150°C - supports automotive under-hood and industrial ambient environments |
Pinout & Package
SOT-23 (TO-236) plastic surface-mount package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting case with corrosion-resistant finish; cathode indicated by polarity band; Pb-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; must be held ≤15.75 V below cathode for regulation |
| 2 | No Connection | Internally unconnected; no PCB trace or pad required; electrically isolated |
| 3 | Cathode | Connected to higher-potential node; polarity band identifies this terminal for correct orientation during placement |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and body electronics requiring PPAP documentation |
| 225 mW Power Rating | Enables compact voltage clamping without heatsinking in battery-powered devices like wearables and IoT sensors |
| Low Dynamic Impedance | 16 Ω at 8.5 mA ensures <160 mV output deviation for ±1 mA load change - critical for stable analog references |
| High ESD Robustness | >16 kV HBM rating eliminates need for external ESD protection in handheld product front-end interfaces |
| Pb-Free & RoHS Compliant | Meets global environmental compliance requirements without sacrificing electrical or thermal performance |
Applications
| Portable Power Management | Automotive Sensor Biasing |
|---|---|
|
Use Scenario: Providing stable 15 V reference for ADC input scaling in Bluetooth earbuds and smartwatches. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference for precision analog signal conditioning. Use Value: Tight 14.25–15.75 V tolerance and low 16 Ω ZZT ensure <±0.5% reference accuracy across battery discharge cycles. |
Use Scenario: Biasing Hall-effect position sensors in EPS (Electric Power Steering) modules. IC Role / Device Role / Timing Role: Clamp and regulate supply rail to protect sensor ICs from transients on 12 V vehicle bus. Use Value: AEC-Q101 qualification and −65°C to +150°C operation guarantee reliability in under-hood thermal cycling. |
| Industrial PLC Input Protection | Medical Wearable Reference |
|
Use Scenario: Overvoltage protection for 0–10 V analog inputs on programmable logic controller (PLC) I/O cards. IC Role / Device Role / Timing Role: Shunt clamp limiting input voltage to 15.75 V during surge events (IEC 61000-4-5 Level 3). Use Value: 225 W peak pulse capability (8 × 20 µs) absorbs transient energy without failure, reducing system-level TVS count. |
Use Scenario: Generating precise bias voltage for low-noise op-amps in ECG patch monitors. IC Role / Device Role / Timing Role: Low-leakage (≤0.1 µA @ 11 V) Zener reference enabling ultra-low-power sleep mode operation. Use Value: Sub-microamp reverse current extends battery life beyond 7 days in single-CR2032 powered designs. |
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-C15LT1G | 15 V nominal, ±5% tolerance, 300 mW rating, same SOT-23 package but non-automotive grade | Lacks AEC-Q101 qualification and has higher ZZT (30 Ω vs. 16 Ω); not approved for automotive use | Select when cost sensitivity outweighs automotive compliance and tighter impedance is unnecessary |
| SZBZX84C15LT1G | 15 V nominal, ±5%, AEC-Q101 qualified, 300 mW, SOT-23 - but higher ZZT (30 Ω) and 0.5 µA leakage @ 12 V | Higher leakage and impedance reduce reference stability in precision analog circuits | Prefer only if higher power (300 mW) is required and 0.1 µA leakage is not critical |
Compared with BZX84-C15LT1G and SZBZX84C15LT1G, SZMMBZ5245ELT1G offers superior regulation stability (16 Ω ZZT, 0.1 µA leakage) and automotive-grade reliability in the same footprint - ideal where precision and qualification are jointly required.
Availability
SZMMBZ5245ELT1G is available at Aetrix Electronics and suitable for automotive sensor modules, portable medical devices, industrial PLC I/O protection, and high-density consumer electronics requiring stable component supply and long-term lifecycle support.
Supply support for SZMMBZ5245ELT1G 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT markets.
SZMMBZ5245ELT1G belongs to the SZMMBZ52xxELT1G series - engineered for automotive-grade voltage regulation with AEC-Q101 qualification, high ESD immunity, and tight parametric control in miniature SOT-23 packaging.
FAQ
What is the Zener voltage tolerance of SZMMBZ5245ELT1G?
The SZMMBZ5245ELT1G has a Zener voltage range of 14.25 V to 15.75 V at IZT = 8.5 mA, corresponding to ±5% tolerance around the nominal 15 V rating. This tolerance is guaranteed across the full operating temperature range of −65°C to +150°C and is verified per onsemi's AEC-Q101 stress testing protocol. The SZMMBZ5245ELT1G maintains this specification without derating in standard FR-5 PCB layouts.
Is SZMMBZ5245ELT1G pin-compatible with MMBZ5245ELT1G?
Yes, SZMMBZ5245ELT1G is pin-compatible with MMBZ5245ELT1G - both use identical SOT-23 package with Pin 1 (Anode), Pin 2 (NC), and Pin 3 (Cathode) configuration. The "SZ" prefix denotes automotive qualification (AEC-Q101, PPAP-capable), while electrical parameters and pinout remain unchanged. No PCB redesign is needed when upgrading from MMBZ5245ELT1G to SZMMBZ5245ELT1G in automotive applications.
What is the maximum reverse leakage current for SZMMBZ5245ELT1G?
The maximum reverse leakage current for SZMMBZ5245ELT1G is 0.1 µA at VR = 11 V and TA = 25°C, as specified in the Electrical Characteristics table. This low leakage supports ultra-low-power operation in battery-critical applications such as wearable health monitors. Leakage remains ≤1 µA up to 150°C, ensuring predictable behavior in high-temperature environments.
Does SZMMBZ5245ELT1G require a heatsink in typical applications?
No, SZMMBZ5245ELT1G does not require an external heatsink in typical applications. With a 225 mW power rating and 556 °C/W junction-to-ambient thermal resistance on FR-5 board, its junction temperature rise is ~125°C at full rated power - acceptable within its −65°C to +150°C operating range. Heatsinking is only necessary if sustained power dissipation exceeds 150 mW in high-ambient-temperature enclosures.
How is the cathode identified on SZMMBZ5245ELT1G?
The cathode of SZMMBZ5245ELT1G is identified by a polarity band located adjacent to Pin 3 on the SOT-23 package. Per the mechanical drawing and marking diagram in the datasheet, Pin 3 is the cathode terminal, Pin 1 is the anode, and Pin 2 is internally unconnected. This marking aligns with industry-standard SOT-23 Zener orientation and is verified in onsemi's CASE 318 STYLE 8 specification.
SZMMBZ5245ELT1G 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):
- 15 V
- Tolerance:
- -
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 16 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 11 V
- Voltage - Forward (Vf) (Max) @ If:
- 950 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)
SZMMBZ5245ELT1G FAQ
1.How can I place an order for SZMMBZ5245ELT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5245ELT1G 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 SZMMBZ5245ELT1G reliable?
The price and inventory of SZMMBZ5245ELT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5245ELT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5245ELT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5245ELT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5245ELT1G?
SZMMBZ5245ELT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5245ELT1G 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 SZMMBZ5245ELT1G?
For technical support, including SZMMBZ5245ELT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5245ELT1G requirements.
6.How does Aetrix verify that SZMMBZ5245ELT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5245ELT1G 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 SZMMBZ5245ELT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5245ELT1G?
All SZMMBZ5245ELT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5245ELT1G, 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 SZMMBZ5245ELT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5245ELT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMBZ5245ELT1G 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…
