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HomeProductsDiscrete Semiconductor ProductsTransistors - Bipolar (BJT) - Arrays, Pre-BiasedPUMD20/ZLX
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PUMD20/ZLX - Nexperia USA Inc.

Manufacturer Part Number
PUMD20/ZLX
Manufacturer
Nexperia
Allelco Part Number
98D-PUMD20/ZLX
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
5,032 pcs available, New & Original
Parts Description
TRANS PREBIAS
Package
6-TSSOP
Data sheet
PUMD20/ZLX.pdf

Datasheets

PEMD20, PUMD20.pdf

PCN Obsolescence/ EOL

EOL 02/Dec/2016.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 5032

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Specifications

PUMD20/ZLX Tech Specifications
Nexperia USA Inc. - PUMD20/ZLX technical specifications, attributes, parameters and parts with similar specifications to Nexperia USA Inc. - PUMD20/ZLX

Product Attribute Attribute Value
Manufacturer Nexperia
Voltage - Collector Emitter Breakdown (Max) 50V
Vce Saturation (Max) @ Ib, Ic 150mV @ 500µA, 10mA
Transistor Type 1 NPN, 1 PNP - Pre-Biased (Dual)
Supplier Device Package 6-TSSOP
Series -
Resistor - Emitter Base (R2) 2.2kOhms
Resistor - Base (R1) 2.2kOhms
Power - Max 300mW
Product Attribute Attribute Value
Package / Case 6-TSSOP, SC-88, SOT-363
Package Bulk
Mounting Type Surface Mount
Frequency - Transition -
DC Current Gain (hFE) (Min) @ Ic, Vce 30 @ 20mA, 5V
Current - Collector Cutoff (Max) 1µA
Current - Collector (Ic) (Max) 100mA
Base Product Number PUMD20

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN OBSOLETE

Frequently Asked Questions(FAQ)

How does the PUMD20/ZLX prebiased dual BJT configuration simplify circuit design compared to using discrete transistors with external biasing resistors?
The PUMD20/ZLX integrates two matched bipolar transistors—one NPN and one PNP—with internal base bias resistors (R1 = R2 = 2.2kΩ) in a single 6-TSSOP package. This eliminates the need for separate resistor networks and ensures precise matching between the transistor pair, improving thermal stability and reducing board space. For designs requiring complementary switching or signal inversion stages, this integration minimizes parasitic effects and simplifies layout, particularly in low-voltage analog or digital control circuits where component count and symmetry are critical.
What is the maximum power dissipation capability of the PUMD20/ZLX, and how should it be managed in continuous operation at elevated ambient temperatures?
The PUMD20/ZLX has a maximum power dissipation of 300mW per transistor junction under still-air conditions, assuming proper PCB thermal management. In practical applications, such as in automotive sensor interfaces or battery-powered devices, derating is essential: operating below 250mW is advisable above 70°C ambient. Engineers should ensure adequate copper area on the PCB or consider airflow if the device operates near its limit, especially when both transistors conduct simultaneously in complementary configurations.
Can the PUMD20/ZLX be used interchangeably with UMH1NTN or RN49A2,LF(CT in legacy designs, and what compatibility considerations apply?
While the PUMD20/ZLX shares functional similarities with substitutes like UMH1NTN and RN49A2,LF(CT—such as dual prebiased BJT structure and similar voltage ratings—key differences exist in pinout, package dimensions, and internal resistance values. The PUMD20/ZLX uses a 6-TSSOP/SOT-363 package and fixed 2.2kΩ base resistors, whereas some alternatives may vary in resistor values or layout. Substitution requires verification of electrical compatibility and footprint alignment; mismatches can lead to altered gain or unintended loading in feedback paths.
What are the implications of the 1µA maximum collector cutoff current for high-impedance sensor interface applications using the PUMD20/ZLX?
The 1µA maximum Ic(off) ensures minimal leakage in off-state conditions, which is beneficial for preserving signal integrity in high-impedance sensor circuits, such as thermocouple amplifiers or capacitive touch detection systems. In battery-operated devices where standby current matters, this low leakage helps maintain longer operational life. However, designers must still account for input bias currents in op-amp configurations interfacing with the PUMD20/ZLX to avoid offset errors exceeding acceptable thresholds.
How does the DC current gain (hFE = 30 @ Ic = 20mA, Vce = 5V) influence base drive requirements in switching applications with the PUMD20/ZLX?
With a minimum hFE of 30, the PUMD20/ZLX requires sufficient base current to saturate the transistor fully. Assuming a load current of 10mA, Ib must exceed 333µA (10mA / 30) to guarantee saturation. Given the internal 2.2kΩ base resistor, the available base drive depends on the preceding stage’s output impedance and voltage swing. Careful analysis shows that without an external buffer, the internal resistor limits peak base current, potentially preventing deep saturation—thus affecting turn-on speed and Vce(sat). This necessitates either external drive enhancement or acceptance of slightly higher saturation voltage.
In what scenarios would the transition frequency limitation (not specified in datasheet) restrict the use of the PUMD20/ZLX despite its suitability for DC or low-frequency analog tasks?
Although transition frequency isn't explicitly stated, the small-signal characteristics and 300mW power rating suggest limited high-frequency performance typical of SOT-363-packaged transistors. At frequencies above 1MHz, parasitic capacitances and junction transit times may degrade performance. Therefore, the PUMD20/ZLX is unsuitable for RF amplification or high-speed switching beyond 500kHz. Its use in PWM motor control above 100kHz should include empirical testing, as internal resistance and package parasitics can cause ringing or delayed turn-off.
What design precautions should be taken when paralleling the NPN and PNP transistors of the PUMD20/ZLX in push-pull output stages?
Paralleling the two transistors within the same die introduces coupling through shared substrate and package parasitics, increasing cross-talk and potential shoot-through during transitions. Unlike discrete matched pairs, the integrated nature reduces thermal symmetry unless carefully managed. To mitigate risks, ensure dead-time insertion in driving signals and monitor junction temperature balance via PCB thermal vias. Additionally, avoid simultaneous conduction; otherwise, localized heating may occur due to uneven current sharing, reducing reliability over time.
How does RoHS compliance affect supply chain risk assessment when sourcing the PUMD20/ZLX for mass production?
As a ROHS3 compliant component, the PUMD20/ZLX meets current European Union restrictions on hazardous substances, including lead, mercury, and cadmium. This simplifies global certification processes and reduces regulatory risk in consumer electronics. However, RoHS compliance alone doesn’t guarantee availability—engineers must confirm active production status, as the ECCN classification indicates the part is obsolete, suggesting limited long-term procurement options and increased reliance on last-time-buy inventory planning.
What is the significance of the Moisture Sensitivity Level (MSL = 1) for the PUMD20/ZLX in assembly processes involving reflow soldering?
MSL 1 means the PUMD20/ZLX is not sensitive to moisture absorption and can be stored indefinitely under normal conditions without baking prior to reflow. This simplifies handling in high-volume manufacturing and reduces process overhead, making it suitable for automated SMT lines. No special dry storage or nitrogen reflow is required, lowering cost and complexity while maintaining reliability across standard Pb-free soldering profiles (e.g., 260°C peak).
Can the PUMD20/ZLX replace discrete transistor-resistor combinations in I²C bus line drivers, and what trade-offs emerge?
Yes, the PUMD20/ZLX can serve as a simple I²C level translator or bus keeper when configured with its internal resistors. The 2.2kΩ base resistors provide weak pull-up-like behavior, but with lower precision than dedicated ICs. However, transistor saturation voltage adds ~150mV drop, increasing logic low levels slightly. While acceptable for 3.3V systems, this may violate timing margins in fast-mode-plus I²C (>1MHz). Thus, the PUMD20/ZLX offers a compact alternative only in slower protocols (<400kHz) or non-critical applications where size outweighs signal fidelity.
Why might the absence of a specified transition frequency in the PUMD20/ZLX datasheet indicate poor suitability for dynamic switching applications?
The omission of fT suggests that performance degrades rapidly beyond audio frequencies due to junction capacitance and carrier transit limitations inherent in sub-millimeter geometries and low-power designs. Without quantitative data, engineers cannot predict slew rate or bandwidth accurately. Consequently, the PUMD20/ZLX should be treated as a DC or low-frequency device. Attempting use in buck converter switches or LED dimming circuits above 5kHz may result in inefficient operation and excessive heat, despite its 300mW rating.
How do the identical base-emitter resistors (2.2kΩ each) in the PUMD20/ZLX benefit symmetrical amplifier stages?
Symmetrical biasing from matched 2.2kΩ resistors ensures balanced quiescent points in differential or complementary emitter-follower configurations, minimizing drift and offset voltage over temperature. This balance is crucial in instrumentation amplifiers or audio preamps where common-mode rejection depends on component matching. The integrated design reduces layout-induced mismatch, offering better CMRR than discrete solutions with hand-matched resistors, though absolute accuracy remains limited by ±20% tolerance in passive components.
What are the risks of exceeding the 50V collector-emitter breakdown voltage in transient conditions when using the PUMD20/ZLX near inductive loads?
Although rated for 50V Vceo, real-world transients from relay coils or motors can exceed this due to back-EMF spikes. Without external clamping diodes or snubbers, internal ESD protection is insufficient for sustained overvoltage. If a transient exceeds 50V, avalanche breakdown may initiate, leading to cumulative damage even if instantaneous energy stays within 300mW limit. Designers should always add flyback diodes or TVS devices when switching inductive loads with the PUMD20/ZLX to prevent premature failure.
Is the PUMD20/ZLX suitable for driving LEDs directly from microcontroller GPIO pins without external current-limiting components?
Direct driving is possible but risky. The internal 2.2kΩ resistor limits base current, which constrains collector current to approximately 500µA (assuming 5V supply and Vbe ≈ 0.7V), resulting in very dim LED output. More critically, without emitter degeneration or series resistor, variations in Vf across LEDs cause unpredictable brightness and potential overdrive. A safer approach uses an external emitter resistor or series LED resistor to stabilize current, ensuring consistent illumination and protecting both the transistor and LED from thermal runaway.
How does the package thermal resistance compare implicitly between the 6-TSSOP and alternative packages like SOT-23 for the PUMD20/ZLX?
Though not quantified in the datasheet, the 6-TSSOP (SOT-363) has higher thermal resistance than larger SOT-23 variants due to smaller copper pad area and thinner leads. In continuous conduction above 50mW, self-heating increases significantly, especially in confined spaces. When selecting between substitute parts, engineers should prioritize packages with exposed pads or lower θJA, as the PUMD20/ZLX’s form factor trades thermal performance for integration density, limiting its use in high-current linear regulation tasks.
What role does the REACH status ("Unaffected") play in environmental compliance audits involving the PUMD20/ZLX?
REACH "Unaffected" indicates no SVHC (Substances of Very High Concern) above 0.1% weight threshold are used in the PUMD20/ZLX’s manufacturing process. This simplifies documentation for OEMs undergoing third-party audits for EU market entry. However, it does not cover end-of-life disposal obligations or conflict mineral reporting. Suppliers may still require disclosure forms, so engineers should verify with procurement teams that full Chain of Custody records are maintained, despite the positive REACH classification.
Why might a designer choose the PUMD20/ZLX over discrete BJTs with external resistors despite its limited power rating?
The PUMD20/ZLX offers superior space efficiency, reduced parasitic inductance/capacitance from integrated layout, and guaranteed matching in dual configurations. In compact IoT nodes or wearable sensors where board real estate is constrained, these advantages outweigh marginal thermal headroom. Moreover, reduced component count lowers BOM cost and assembly defects. For applications with intermittent duty cycles and modest loads (<100mA), the 300mW limit is rarely exceeded, making the PUMD20/ZLX a pragmatic choice for reliable, low-complexity signal conditioning.

Parts with Similar Specifications

The three parts on the right have similar specifications to Nexperia USA Inc. PUMD20/ZLX

Product Attribute PUMD2/ZLX PUMD24/ZLX PUMD2/ZLH PUMD2/ZLZ
Part Number PUMD2/ZLX PUMD24/ZLX PUMD2/ZLH PUMD2/ZLZ
Manufacturer Nexperia USA Inc. Nexperia USA Inc. Nexperia USA Inc. Nexperia USA Inc.
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Current - Collector Cutoff (Max) - - - -
DC Current Gain (hFE) (Min) @ Ic, Vce - - - -
Series - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Transistor Type - - - -
Resistor - Emitter Base (R2) - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Frequency - Transition - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Resistor - Base (R1) - - - -
Power - Max - - - -
Vce Saturation (Max) @ Ib, Ic - - - -
Voltage - Collector Emitter Breakdown (Max) - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Current - Collector (Ic) (Max) - - - -

PUMD20/ZLX Datasheet PDF

Download PUMD20/ZLX pdf datasheets and Nexperia USA Inc. documentation for PUMD20/ZLX - Nexperia USA Inc..

Datasheets
PEMD20, PUMD20.pdf
PCN Packaging
Label Chg 12/Mar/2017.pdf All Dev Label Chgs 2/Aug/2020.pdf
PCN Obsolescence/ EOL
EOL 02/Dec/2016.pdf

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Customer Reviews

Evaluation: 10 Articles

  • ECUb***h
    Sep 22, 2026

    Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.

  • RS48***ieldTech
    Sep 16, 2026

    Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.

  • Logi***b_Chris
    Sep 8, 2026

    Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
    Aug 20, 2026

    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
    Aug 17, 2026

    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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Nexperia USA Inc.

PUMD20/ZLX

Nexperia USA Inc.
98D-PUMD20/ZLX

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