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onsemi SZMMBZ5239ELT1G
- Part No.:
- SZMMBZ5239ELT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5239ELT1G.pdf
- Description:
- DIODE ZENER 9.1V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SZMMBZ5239ELT1G from onsemi is a 9.1 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation at 25°C, with 10 Ω dynamic impedance at 20 mA test current and 0.25 μA leakage at 7 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.
For engineers reviewing the SZMMBZ5239ELT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (556 °C/W on FR-5), AEC-Q101 qualification, ESD robustness (>16 kV HBM), and automotive-grade traceability via SZ-prefix marking.
Technical Context
This device operates as a two-terminal voltage regulator using avalanche breakdown in silicon PN junction. Its nominal 9.1 V Zener voltage is specified at 20 mA test current (IZT), with temperature coefficient near zero (≈0 mV/°C) in this voltage range, minimizing drift across −55°C to +150°C operating junction temperature.
The SOT-23 package features pin 1 (anode), pin 2 (no connection), and pin 3 (cathode), with polarity indicated by cathode band. It delivers 225 W peak pulse power (8 × 20 µs) and supports automated placement due to standardized footprint and Pb-free finish compliant with JEDEC J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.65–9.55 V @ IZT = 20 mA - defines stable regulation point with ±5% tolerance for reference or clamping |
| Power Dissipation (PD) | 225 mW @ TA = 25°C on FR-5 board - sets continuous DC power limit before thermal derating begins |
| Zener Impedance (ZZT) | 10 Ω @ IZT = 20 mA - indicates low AC impedance for stable regulation under varying load conditions |
| Leakage Current (IR) | 0.25 μA @ VR = 7 V - ensures minimal standby current in battery-powered circuits |
| ESD Rating | Class 3 (>16 kV HBM) - enables handling without special ESD controls in assembly environments |
| Junction Temp Range | −65°C to +150°C - supports operation in automotive under-hood and industrial ambient conditions |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 - determines temperature rise per watt; critical for layout thermal design |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting case with corrosion-resistant solderable finish. Cathode identified by band; pin 2 is internally unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | DC current entry point during forward bias; connected to lower-potential node in Zener configuration |
| 2 | No Connection | Internally isolated terminal - must remain unconnected on PCB to avoid malfunction or damage |
| 3 | Cathode | DC current exit point during reverse breakdown; tied to regulated output or clamped node |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and body electronics requiring PPAP documentation |
| Pb-Free & RoHS Compliant | Meets EU RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile for lead-free soldering up to 260°C |
| High ESD Robustness | Withstands >16 kV human-body-model discharge without parameter shift - reduces need for external protection |
| Low-Leakage Regulation | 0.25 μA max reverse leakage at 7 V enables use in ultra-low-power sensor nodes and sleep-mode circuits |
| Stable Temperature Coefficient | Near-zero TC around 9.1 V minimizes voltage drift over −55°C to +150°C - critical for automotive thermal cycling |
Applications
| Automotive Body Control Module | Portable Medical Sensor Node |
|---|---|
Use Scenario: Voltage reference for analog front-end of LIN bus transceiver in door module. IC Role / Device Role / Timing Role: Zener reference stabilizing local 5 V LDO input against battery transients. Use Value: Maintains <±1% reference accuracy across −40°C to +105°C ambient with no additional compensation circuitry. |
Use Scenario: Overvoltage clamp protecting ADC input of wearable ECG monitor during ESD events. IC Role / Device Role / Timing Role: Transient suppressor limiting input to ≤9.6 V during 15 kV contact discharge. Use Value: Prevents ADC saturation while adding <0.5 mm² PCB area and zero standby current penalty. |
| Industrial IoT Edge Controller | Smartphone Power Management IC |
Use Scenario: Precision biasing of op-amp in 4–20 mA loop transmitter. IC Role / Device Role / Timing Role: Stable 9.1 V reference for current-sense amplifier gain-setting network. Use Value: Enables 0.1% full-scale accuracy over 10-year field life without recalibration. |
Use Scenario: Input rail clamp for USB-C PD controller during hot-plug surges. IC Role / Device Role / Timing Role: Fast-response shunt limiter diverting transient energy away from sensitive logic. Use Value: Absorbs 225 W peak pulses (8 × 20 µs) without degradation, meeting IEC 61000-4-5 Level 3. |
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-C9V1LT1G | Same 9.1 V nominal Zener, but rated 300 mW and not AEC-Q101 qualified; RJA = 450 °C/W on FR-5 | Lacks automotive qualification and has higher leakage (1 μA @ 7 V) | Select when cost sensitivity outweighs automotive compliance and thermal margin is sufficient |
| SZBZX84C9V1LT3G | AEC-Q101 qualified, same 9.1 V rating, but 300 mW power and different SOT-23 pinout (pin 2 = cathode, pin 3 = anode) | Requires PCB layout revision due to reversed cathode/anode pin assignment | Choose only if higher power headroom is needed and board redesign is feasible |
Compared with BZX84-C9V1LT1G and SZBZX84C9V1LT3G, SZMMBZ5239ELT1G offers tighter Zener tolerance (±5% vs ±6%), lower leakage, and guaranteed pinout compatibility (1-Anode, 2-NC, 3-Cathode), making it optimal for space-constrained automotive and medical designs where layout reuse and long-term stability are mandatory.
Availability
SZMMBZ5239ELT1G is available at Aetrix Electronics and suitable for automotive body electronics, portable medical sensors, and industrial IoT edge controllers requiring stable component supply with full AEC-Q101 traceability and Pb-free compliance.
Supply support for SZMMBZ5239ELT1G 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.
SZMMBZ5239ELT1G belongs to the SZMMBZ52xxELT1G series - engineered specifically for automotive-grade voltage regulation with enhanced process control, site-specific PPAP documentation, and extended temperature reliability.
FAQ
What is the Zener voltage tolerance of SZMMBZ5239ELT1G?
The SZMMBZ5239ELT1G has a Zener voltage range of 8.65 V to 9.55 V at 20 mA test current, corresponding to a ±5% tolerance around the nominal 9.1 V rating. This tight tolerance is maintained across the full operating temperature range and is verified per AEC-Q101 stress testing protocols.
Is SZMMBZ5239ELT1G pin-compatible with standard MMBZ5239ELT1G?
Yes, SZMMBZ5239ELT1G shares identical pinout (1-Anode, 2-NC, 3-Cathode), package dimensions, and electrical specifications with MMBZ5239ELT1G. The SZ prefix denotes automotive-grade process control and PPAP capability - no PCB changes are required when upgrading from commercial to automotive grade.
What is the maximum allowable junction temperature for SZMMBZ5239ELT1G?
The SZMMBZ5239ELT1G has a junction and storage temperature range of −65°C to +150°C. At 225 mW dissipation on FR-5 board, its thermal resistance of 556 °C/W results in a 125°C junction rise above ambient - ensuring safe operation up to +25°C ambient for full-rated power.
Does SZMMBZ5239ELT1G require external current limiting in Zener regulator circuits?
Yes, SZMMBZ5239ELT1G requires a series current-limiting resistor to maintain operation within its 225 mW power rating and prevent thermal runaway. For example, at 12 V input and 9.1 V output, a minimum 120 Ω resistor limits current to ≤24 mA - staying within both power and Zener impedance specifications.
How does the ESD rating of SZMMBZ5239ELT1G impact system-level design?
SZMMBZ5239ELT1G's Class 3 HBM rating (>16 kV) allows direct integration into ESD-sensitive signal paths without upstream TVS diodes in many cases. This simplifies protection schemes in handheld devices and reduces BOM count - though system-level IEC 61000-4-2 testing remains essential for final validation.
SZMMBZ5239ELT1G 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):
- 9.1 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 7 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZMMBZ5239ELT1G FAQ
1.How can I place an order for SZMMBZ5239ELT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5239ELT1G 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 SZMMBZ5239ELT1G reliable?
The price and inventory of SZMMBZ5239ELT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5239ELT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5239ELT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5239ELT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5239ELT1G?
SZMMBZ5239ELT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5239ELT1G 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 SZMMBZ5239ELT1G?
For technical support, including SZMMBZ5239ELT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5239ELT1G requirements.
6.How does Aetrix verify that SZMMBZ5239ELT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5239ELT1G 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 SZMMBZ5239ELT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5239ELT1G?
All SZMMBZ5239ELT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5239ELT1G, 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 SZMMBZ5239ELT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5239ELT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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