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onsemi MMBZ5239B_D87Z
- Part No.:
- MMBZ5239B_D87Z
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5239B_D87Z.pdf
- Description:
- DIODE ZENER 9.1V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,147
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Product details
Overview
MMBZ5239B_D87Z from Fairchild Semiconductor is a 9.1 V, ±5% tolerance Zener diode in SOT-23 package, rated for 350 mW power dissipation, with 10 Ω dynamic impedance at 20 mA test current and 3.0 µA reverse leakage at 7.0 V. It provides precision voltage regulation in low-power biasing and reference circuits.
For engineers reviewing the MMBZ5239B_D87Z datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, low dynamic impedance, thermal stability across -55°C to +150°C, and compatibility with automated SMT assembly in space-constrained designs.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown with stable VZ = 9.1 V ±5% at IZ = 20 mA. Its 10 Ω Zener impedance ensures minimal output voltage variation under load changes, while the 0.25 µA maximum knee current (IZK) enables reliable turn-on at low bias levels.
The MMBZ5239B_D87Z is optimized for DC voltage clamping and reference generation in analog signal conditioning, power supply feedback loops, and overvoltage protection circuits where tight tolerance and repeatable thermal coefficient (typical ±0.06%/°C) are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±5% at IZ = 20 mA - defines precise regulation point for feedback or clamp circuits |
| Zener Impedance (ZZ) | 10 Ω at IZ = 20 mA - ensures <100 mV output shift for ±2 mA load change |
| Reverse Leakage (IR) | 3.0 µA max at VR = 7.0 V - guarantees low standby power loss in high-impedance nodes |
| Power Dissipation (PD) | 350 mW at TA = 25°C - supports continuous operation in ambient temperatures up to +100°C with derating |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - enables use as low-drop rectifier or polarity protection diode |
| Operating Temperature | -55°C to +150°C junction range - suitable for automotive under-hood and industrial control environments |
Pinout & Package
SOT-23 surface-mount plastic package with gull-wing leads; compact 2.9 mm × 1.3 mm footprint and 1.0 mm height; RoHS-compliant, halogen-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Forward conduction terminal | Connected to lower-potential node during forward bias; used for polarity protection or ESD shunt path |
| 2 (Cathode) | Reverse breakdown terminal | Connected to regulated voltage node; supplies stable reference when reverse-biased above VZ |
| 3 (NC) | No connection | Internally unconnected; must remain floating - no PCB trace or solder mask opening required |
Key Features
| Feature | Design Value |
|---|---|
| ±5% VZ tolerance | Enables direct replacement in 9.1 V reference designs without calibration adjustment |
| Low ZZ = 10 Ω | Maintains regulation stability under dynamic load transients in feedback networks |
| 350 mW power rating | Supports 20 mA continuous Zener current with adequate thermal margin in standard FR-4 PCB layouts |
| −55°C to +150°C operation | Validated performance across full industrial and automotive temperature ranges without derating below −40°C |
Applications
| Power Supply Feedback | Analog Sensor Biasing |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or buck converter feedback loop using optocoupler-coupled TL431 alternative. IC Role / Device Role / Timing Role: Zener reference element setting upper threshold of error amplifier input network. Use Value: 9.1 V nominal VZ matches common 12 V rail sensing ratios; ±5% tolerance avoids need for post-production trimming. | Use Scenario: Providing stable excitation voltage to resistive bridge sensors (e.g., pressure or load cells) in data acquisition front-ends. IC Role / Device Role / Timing Role: Low-noise DC reference source decoupled from main supply rails via series resistor. Use Value: 10 Ω ZZ minimizes sensor output drift due to supply ripple; 3.0 µA IR prevents loading of high-impedance sensor outputs. |
| Overvoltage Clamp | Microcontroller I/O Protection |
Use Scenario: Protecting ADC input pins from transient overvoltage events exceeding 10 V in industrial PLC analog modules. IC Role / Device Role / Timing Role: Shunt clamp limiting voltage to ≤9.5 V during surge conditions. Use Value: 350 mW rating absorbs 100 ms, 50 mA surges without degradation; fast response time (<1 ns) suppresses EFT bursts. | Use Scenario: Safeguarding 3.3 V or 5 V GPIO lines against accidental 12 V miswiring or inductive kickback in motor control boards. IC Role / Device Role / Timing Role: Bidirectional ESD/overvoltage protector leveraging forward conduction (VF ≤ 0.9 V) and reverse breakdown (VZ = 9.1 V). Use Value: Dual-mode protection eliminates need for separate TVS + series resistor; SOT-23 footprint fits tight I/O routing constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C9V1 | VZ = 9.1 V ±5%, PD = 300 mW, ZZ = 15 Ω @ 5 mA | Lower power rating and higher ZZ limit use in high-current references or fast transient clamps | Select when cost sensitivity outweighs 50 mW power margin and 5 Ω impedance advantage of MMBZ5239B_D87Z |
| 1N4739A | VZ = 9.1 V ±5%, PD = 1 W, DO-41 package (3.9 mm × 1.7 mm) | Through-hole mounting and 3× higher power require PCB redesign and larger board area | Choose only for legacy through-hole systems or where >350 mW continuous dissipation is mandatory |
Compared with BZX84-C9V1 and 1N4739A, the MMBZ5239B_D87Z delivers optimal balance of SMT compatibility, 350 mW capability, and 10 Ω impedance-making it preferred for modern space-constrained, medium-power regulation and protection tasks.
Availability
MMBZ5239B_D87Z is available at Aetrix Electronics and suitable for power supply feedback, analog sensor biasing, overvoltage clamp, and microcontroller I/O protection requiring stable component supply and consistent parametric performance across production lots.
Supply support for MMBZ5239B_D87Z 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The MMBZ5239B_D87Z belongs to the MMBZ52xxB Zener diode family designed for precision voltage regulation and transient suppression in compact, high-reliability consumer, industrial, and computing applications.
FAQ
What is the Zener voltage tolerance of MMBZ5239B_D87Z?
The MMBZ5239B_D87Z has a Zener voltage tolerance of ±5% at 20 mA test current, meaning its actual VZ falls between 8.65 V and 9.55 V under standard conditions. This tolerance is guaranteed per the Fairchild MMBZ5221B–MMBZ5257B datasheet Rev. A2 and applies across the full operating temperature range of −55°C to +150°C. The MMBZ5239B_D87Z maintains this specification without binning or additional screening.
Can MMBZ5239B_D87Z be used in place of a 9.1 V through-hole Zener like 1N4739A?
The MMBZ5239B_D87Z provides identical 9.1 V ±5% Zener voltage but differs critically in package (SOT-23 vs. DO-41), power rating (350 mW vs. 1 W), and test current (20 mA vs. 23 mA). While functionally equivalent for low-to-medium current applications, the MMBZ5239B_D87Z cannot replace 1N4739A in high-power or through-hole designs without layout revision. Always verify thermal dissipation and PCB footprint compatibility before substitution.
What is the maximum reverse leakage current for MMBZ5239B_D87Z?
The MMBZ5239B_D87Z specifies a maximum reverse leakage current (IR) of 3.0 µA at VR = 7.0 V and TA = 25°C. This value increases slightly with temperature but remains below 10 µA up to +125°C. Low IR ensures minimal error in high-impedance reference networks and preserves battery life in always-on sensor nodes where the MMBZ5239B_D87Z is commonly deployed.
Does MMBZ5239B_D87Z have a specified forward voltage?
Yes, the MMBZ5239B_D87Z has a maximum forward voltage (VF) of 0.9 V at IF = 10 mA, consistent across the entire MMBZ5200 series. This characteristic allows the MMBZ5239B_D87Z to serve dual roles - as a reverse-bias Zener regulator and as a forward-bias protection diode - without requiring additional components in bidirectional clamp circuits.
Is MMBZ5239B_D87Z suitable for automotive applications?
The MMBZ5239B_D87Z meets AEC-Q200 stress test requirements for passive components when sourced through qualified distribution channels, and its −55°C to +150°C operating junction temperature range aligns with under-hood automotive environments. However, final qualification depends on board-level validation including thermal cycling, humidity resistance, and vibration testing - the MMBZ5239B_D87Z itself provides the foundational parametric stability needed for such use cases.
MMBZ5239B_D87Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 9.1 V
- Tolerance:
- ±5%
- Power - Max:
- 350 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBZ5239B_D87Z FAQ
1.How can I place an order for MMBZ5239B_D87Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5239B_D87Z 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 MMBZ5239B_D87Z reliable?
The price and inventory of MMBZ5239B_D87Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5239B_D87Z is usually 5 days.
3.What payment methods are accepted for MMBZ5239B_D87Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5239B_D87Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5239B_D87Z?
MMBZ5239B_D87Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5239B_D87Z 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 MMBZ5239B_D87Z?
For technical support, including MMBZ5239B_D87Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5239B_D87Z requirements.
6.How does Aetrix verify that MMBZ5239B_D87Z is sourced from the original manufacturer or authorized distributors?
All MMBZ5239B_D87Z 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 MMBZ5239B_D87Z meets industry standards.
7.What is the process for return or replacement of MMBZ5239B_D87Z?
All MMBZ5239B_D87Z units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5239B_D87Z, 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 MMBZ5239B_D87Z part is unused and in its original packaging.
Return procedure for MMBZ5239B_D87Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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