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Diodes Incorporated MMBZ5238BS-7
- Part No.:
- MMBZ5238BS-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Zener Diode Arrays
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
MMBZ5238BS-7.pdf
- Description:
- DIODE ZENER ARRAY 8.7V SOT363
- Quantity:
- Payment:
- Shipping:
Inventory:9,133
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Product details
Overview
MMBZ5238BS-7 from Diodes Incorporated is a dual-isolated 200 mW surface-mount Zener diode in SOT-363 package, with nominal zener voltage 8.7 V (min 8.27 V, max 9.14 V) at 20 mA test current, 8 Ω zener impedance at 20 mA, and 600 µA reverse leakage at 6.5 V. It serves as precision voltage reference and overvoltage clamp in low-power analog signal conditioning circuits.
For engineers reviewing the MMBZ5238BS-7 datasheet, MMBZ5238BS-7 pinout, MMBZ5238BS-7 application, or MMBZ5238BS-7 equivalent, key selection factors include its dual-zener topology in ultra-small SOT-363, tight 8.27–9.14 V tolerance, low 8 Ω dynamic impedance, thermal resistance of 625 °C/W on FR4, and RoHS-compliant matte tin plating.
Technical Context
This device integrates two independent Zener diodes in a single SOT-363 package, enabling bidirectional clamping or dual-rail reference generation without discrete pairing. Its planar die construction ensures stable breakdown characteristics across -65 °C to +150 °C operating range.
Designed for automated SMT assembly, it features moisture sensitivity level 1 per J-STD-020D and UL 94V-0 mold compound. The 0.006 g mass and 2.0 × 1.25 mm footprint support high-density PCB layouts in space-constrained portable electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nom/Min/Max) | 8.7 V / 8.27 V / 9.14 V at 20 mA - defines precise clamping threshold with ±5% tolerance |
| Power Dissipation | 200 mW - limits continuous dissipation on standard FR4 board with recommended pad layout |
| Zener Impedance | 8 Ω at 20 mA - ensures minimal voltage shift under load variation in regulation circuits |
| Reverse Leakage | 600 µA at 6.5 V - confirms low standby current in voltage-sense paths |
| Thermal Resistance | 625 °C/W junction-to-ambient - requires derating above 25 °C ambient per Fig. 1 curve |
| Operating Temperature | -65 °C to +150 °C - supports industrial and automotive under-hood applications |
Pinout & Package
SOT-363 (SC-70-6) plastic surface-mount package with six terminals: two anodes (A1, A2), two cathodes (C1, C2), and two no-connect (NC) pins. Molded UL 94V-0 compound; matte tin-plated Alloy 42 leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1 | Zener Cathode 1 | Connects to positive rail for forward-biased operation or negative rail for reverse-biased clamping |
| A1 | Zener Anode 1 | Reference node for first Zener; ties to ground or signal return in shunt regulator |
| C2 | Zener Cathode 2 | Independent cathode for second Zener; enables dual-rail or bidirectional protection |
| A2 | Zener Anode 2 | Second anode node; isolated from A1/C1 to permit separate biasing |
| NC | No Connect | Unbonded terminal; must remain unconnected per mechanical design |
| NC | No Connect | Unbonded terminal; no electrical function or internal connection |
Key Features
| Feature | Design Value |
|---|---|
| Dual isolated Zeners | Two independent 8.7 V Zeners in one SOT-363 - reduces board area vs. two discrete devices |
| Planar die construction | Stable breakdown voltage over temperature and lifetime - critical for long-term reference accuracy |
| Lead-free/RoHS compliant | Matte tin finish over Alloy 42 - meets global environmental regulations without solderability compromise |
| Moisture sensitivity Level 1 | No floor life limitation before reflow - eliminates baking requirement in production |
Applications
| Portable Power Management | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage clamping on battery monitor IC inputs in Bluetooth earbuds and wearables. IC Role / Device Role / Timing Role: Dual-Zener provides bidirectional ESD protection and rail-to-rail voltage limiting for ADC reference pins. Use Value: Prevents latch-up in 1.8 V/3.3 V mixed-signal ICs using single 8.7 V Zener pair instead of two discrete diodes. | Use Scenario: Precision voltage reference for 4–20 mA loop-powered pressure transmitters. IC Role / Device Role / Timing Role: Shunt regulator supplying stable 8.7 V to op-amp bias networks and sensor excitation circuitry. Use Value: Maintains ±0.5% output stability over -40 °C to +85 °C due to low tempco and 8 Ω impedance. |
| Automotive Body Control Modules | Medical Diagnostic Equipment |
Use Scenario: Overvoltage suppression on LIN bus transceiver supply lines in door module ECUs. IC Role / Device Role / Timing Role: Clamps transients up to 25 V while maintaining low leakage below 6.5 V to avoid false wake-up. Use Value: 600 µA IR at 6.5 V ensures negligible quiescent current draw during sleep mode. | Use Scenario: Reference stabilization in portable ECG front-end amplifiers with ±5 V rails. IC Role / Device Role / Timing Role: Dual-Zener establishes symmetrical ±8.7 V clamping thresholds for differential input protection. Use Value: Independent C1/A1 and C2/A2 terminals allow true bipolar clamping without shared node error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C8V2LT1G | Single 8.2 V Zener, SOT-23, 350 mW, 15 Ω ZZT | Requires two devices for dual configuration; higher impedance degrades regulation accuracy | Select when only unidirectional clamping is needed and board space allows discrete placement |
| MMBZ5237BS-7-F | 8.2 V nominal (7.79–8.61 V), same SOT-363 package and dual topology | Narrower voltage window suits 8 V rail systems; 500 µA IR at 6.5 V offers lower leakage | Choose for tighter 8.2 V tolerance where system margin permits lower nominal voltage |
Compared with BZX84-C8V2LT1G, MMBZ5238BS-7 saves 40% board area and improves regulation stability via lower 8 Ω impedance; versus MMBZ5237BS-7-F, it trades 0.5 V higher nominal voltage for wider 8.27–9.14 V tolerance band suitable for variable-load references.
Availability
MMBZ5238BS-7 is available at Aetrix Electronics and suitable for portable power management, industrial sensor signal conditioning, and automotive body control modules requiring stable component supply with full traceability and lifecycle continuity.
Supply support for MMBZ5238BS-7 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 MMBZ52xxBS series belongs to Diodes' precision Zener portfolio targeting compact, high-reliability voltage reference and transient suppression in consumer, industrial, and automotive applications.
FAQ
What is the maximum reverse voltage this device can withstand before breakdown?
The MMBZ5238BS-7 has a nominal zener voltage of 8.7 V with guaranteed minimum 8.27 V and maximum 9.14 V at 20 mA test current. Breakdown occurs within this range; operation above 9.14 V risks exceeding power rating unless current is strictly limited by external series resistance.
Can both Zener diodes be used simultaneously in the same circuit?
Yes - C1/A1 and C2/A2 form two fully isolated Zener junctions. They may be biased independently: e.g., C1 to +VCC and A1 to GND for positive clamping, while C2 to GND and A2 to -VEE for negative clamping in split-rail systems.
Is this part suitable for use in high-humidity environments?
Yes - rated moisture sensitivity level 1 per J-STD-020D, meaning it may be stored indefinitely at ≤30 °C/60% RH without baking. The UL 94V-0 mold compound and matte tin plating provide robust resistance to humidity-induced corrosion and dendritic growth.
How does thermal derating affect its power handling capability?
At 25 °C ambient, full 200 mW dissipation is allowed. Above 25 °C, power must be linearly reduced per Fig. 1: at 75 °C ambient, max dissipation drops to 100 mW. This assumes mounting on FR4 with Diodes' recommended pad layout (AP02001.pdf).
MMBZ5238BS-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Configuration:
- 2 Independent
- Voltage - Zener (Nom) (Vz):
- 8.7 V
- Tolerance:
- ±5%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 6.5 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-363
MMBZ5238BS-7 FAQ
1.How can I place an order for MMBZ5238BS-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5238BS-7 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 MMBZ5238BS-7 reliable?
The price and inventory of MMBZ5238BS-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5238BS-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5238BS-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5238BS-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5238BS-7?
MMBZ5238BS-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5238BS-7 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 MMBZ5238BS-7?
For technical support, including MMBZ5238BS-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5238BS-7 requirements.
6.How does Aetrix verify that MMBZ5238BS-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5238BS-7 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 MMBZ5238BS-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5238BS-7?
All MMBZ5238BS-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5238BS-7, 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 MMBZ5238BS-7 part is unused and in its original packaging.
Return procedure for MMBZ5238BS-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5238BS-7 Tags
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