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Diodes Incorporated MMBZ5258BW-7-F
- Part No.:
- MMBZ5258BW-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5258BW-7-F.pdf
- Description:
- DIODE ZENER 36V 200MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,994
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Product details
Overview
MMBZ5258BW-7-F from Diodes Incorporated is a 36 V, 200 mW surface-mount Zener diode in SOT323 package, rated for ±3% Zener voltage tolerance at 3.4 mA test current, with 70 Ω maximum Zener impedance at 1 kHz and 0.1 μA reverse leakage at 27 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning circuits.
For engineers reviewing the MMBZ5258BW-7-F datasheet, MMBZ5258BW-7-F pinout, MMBZ5258BW-7-F application, or MMBZ5258BW-7-F equivalent, key selection criteria include nominal Zener voltage (36 V), power rating (200 mW), Zener impedance (70 Ω), thermal resistance (625 °C/W), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage regulation under controlled current conditions. Its 36 V nominal Zener voltage is specified at IZT = 3.4 mA, with dynamic impedance measured at 1 kHz and thermal resistance of 625 °C/W on FR4 PCB per recommended pad layout.
The device uses alloy 42 leadframe with matte tin plating, conforms to AEC-Q101 stress testing for high-reliability automotive applications, and features halogen- and antimony-free "Green" molding compound compliant with UL 94V-0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 36 V - Stable regulation point at 3.4 mA test current, ±3% tolerance ensures predictable clamping in feedback loops. |
| Power Dissipation | 200 mW - Maximum continuous DC power handling on FR4 board; derates linearly above +25°C ambient per Fig. 1. |
| Zener Impedance | 70 Ω max @ 1 kHz - Low dynamic resistance enables tight voltage regulation under small-signal AC variations. |
| Reverse Leakage Current | 0.1 μA @ 27 V - Minimal off-state current preserves accuracy in high-impedance bias networks. |
| Thermal Resistance | 625 °C/W - Junction-to-ambient value defines temperature rise per watt; requires thermal-aware PCB layout. |
| Package | SOT323 - 3-pin surface-mount outline (2.10 × 1.30 × 0.90 mm) optimized for automated pick-and-place assembly. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD. |
Pinout & Package
MMBZ5258BW-7-F is housed in a 3-terminal SOT323 plastic package with cathode-anode-cathode configuration. The center pin is the anode; outer pins are electrically connected as cathode (dual-cathode construction).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Left) | Cathode | Connected to regulated output node; carries reverse breakdown current during clamping. |
| Pin 2 (Center) | Anode | Reference ground connection; polarity must be observed to avoid forward conduction. |
| Pin 3 (Right) | Cathode | Electrically tied to Pin 1 internally; provides redundant cathode path for improved current sharing. |
Key Features
| Feature | Design Value |
|---|---|
| Automated assembly compatibility | SOT323 footprint supports high-speed pick-and-place and reflow soldering without tombstoning. |
| Lead-free and RoHS compliance | Fully EU Directive 2011/65/EU compliant with <900 ppm Br, <900 ppm Cl, and <1000 ppm Sb compounds. |
| High-reliability qualification | AEC-Q101 qualified for automotive underhood and infotainment systems requiring extended lifetime stability. |
| Low moisture sensitivity | MSL Level 1 per J-STD-020D - no dry-pack or baking required before assembly. |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage clamping on LIN bus transceiver supply rail to prevent overvoltage damage during load dump events. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator to clamp transient spikes to ≤36 V. Use Value: Prevents latch-up in LIN PHY ICs by limiting rail excursion within safe operating area defined by ISO 16750-2. | Use Scenario: Reference voltage stabilization for 4–20 mA current loop transmitter DAC output stage. IC Role / Device Role / Timing Role: Precision Zener providing stable 36 V reference for op-amp feedback network. Use Value: Maintains ±0.5% output accuracy over temperature due to low ZZT and tight VZ tolerance. |
| Consumer Audio Power Supply Monitoring | Medical Portable Device Battery Protection |
Use Scenario: Overvoltage detection circuit monitoring 3.3 V LDO output using resistive divider into Zener-clamped comparator input. IC Role / Device Role / Timing Role: Clamp diode protecting comparator input from >36 V fault conditions. Use Value: Enables robust fault detection without external TVS, reducing BOM count and board space. | Use Scenario: Cell voltage monitoring in dual-cell Li-ion battery pack where 36 V represents full-charge threshold. IC Role / Device Role / Timing Role: Zener-based comparator reference for charge termination logic. Use Value: Provides repeatable 36 V trip point across -40°C to +125°C, meeting IEC 60601-1 leakage limits. |
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-C36LT1G | Same 36 V nominal Zener, but 350 mW power rating and higher ZZT (100 Ω max). | Higher power dissipation allows use in higher-current clamp circuits; less suitable for ultra-low-leakage bias networks. | Select when higher surge energy handling is needed; verify thermal margin on PCB. |
| MMBZ5258BS-7-F | Identical electrical specs but SOT363 package (dual-diode configuration); single-diode variant uses SOT323. | Not interchangeable in single-diode layouts; requires redesign for dual-diode footprint and routing. | Choose only if dual-Zener functionality or shared cathode/anode topology is required. |
Compared with BZX84-C36LT1G and MMBZ5258BS-7-F, MMBZ5258BW-7-F offers optimal balance of low leakage (0.1 μA), tight tolerance (±3%), and AEC-Q101 qualification-making it preferred for automotive and medical signal integrity applications where long-term stability and regulatory compliance are critical.
Availability
MMBZ5258BW-7-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor transmitters, consumer audio power monitors, and medical portable device battery protection circuits requiring stable component supply and AEC-Q101 traceability.
Supply support for MMBZ5258BW-7-F 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The MMBZ52xxBW series belongs to Diodes' automotive-qualified Zener diode product line, engineered specifically for precision voltage reference and overvoltage protection in harsh-environment electronics where reliability and regulatory compliance are mandatory.
FAQ
What is the maximum reverse voltage this Zener can withstand before breakdown?
The MMBZ5258BW-7-F has a nominal Zener voltage of 36 V, with guaranteed breakdown occurring between 34.2 V (min) and 37.8 V (max) at 3.4 mA test current. It is not rated for sustained operation above its specified VZ range; exceeding 37.8 V risks thermal runaway unless current is strictly limited by external series resistance.
Is this part suitable for use in a 125°C ambient environment?
Yes-MMBZ5258BW-7-F is rated for operation from –65°C to +150°C junction temperature. At 125°C ambient, derating per Fig. 1 reduces usable power to ~80 mW. With proper PCB copper area and thermal vias, it remains functional in under-hood automotive applications.
Does the SOT323 package support hand-soldering repair?
The SOT323 package is compatible with hand-soldering using fine-tip irons (≤0.5 mm tip) and flux-core solder, but requires precise alignment and controlled heat (<3 seconds per joint) to avoid delamination or leadframe damage. Rework is feasible but not recommended for high-volume production repair.
How does the dual-cathode construction affect circuit layout?
The dual-cathode (Pins 1 and 3) configuration allows either pin to serve as the primary cathode connection, improving current distribution and reducing localized heating. Layout should connect both cathode pins to the same net; floating one pin may cause uneven current sharing and premature failure.
MMBZ5258BW-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 36 V
- Tolerance:
- ±5%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 27 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBZ5258BW-7-F FAQ
1.How can I place an order for MMBZ5258BW-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5258BW-7-F 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 MMBZ5258BW-7-F reliable?
The price and inventory of MMBZ5258BW-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5258BW-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5258BW-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5258BW-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5258BW-7-F?
MMBZ5258BW-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5258BW-7-F 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 MMBZ5258BW-7-F?
For technical support, including MMBZ5258BW-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5258BW-7-F requirements.
6.How does Aetrix verify that MMBZ5258BW-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5258BW-7-F 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 MMBZ5258BW-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5258BW-7-F?
All MMBZ5258BW-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5258BW-7-F, 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 MMBZ5258BW-7-F part is unused and in its original packaging.
Return procedure for MMBZ5258BW-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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